A=7Li (1988AJ01)

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⁷Li (1988AJ01)

(See Energy Level Diagrams for ⁷Li)

GENERAL: See also (1984AJ01) and Table 7.2 [Table of Energy Levels] (in PDF or PS) here.

Shell model: (1983BU1B, 1983KU17, 1983SH1D, 1983VA31, 1984CH24, 1984REZZ, 1984VA06, 1984ZW1A, 1985FI1E, 1985GO11, 1986AV08, 1987KA09, 1987KI1C, 1988WO04).

Cluster and α-particle models: (1981PL1A, 1983FU1D, 1983HO22, 1983PA06, 1983SH1D, 1983SR1C, 1984BA53, 1984DA07, 1984DU13, 1984DU17, 1984JO1A, 1984KA06, 1984KA04, 1984LO09, 1984MI1F, 1984SH26, 1985FI1E, 1985FU01, 1985FU11, 1985KW02, 1985WA17, 1986AV08, 1986FA11, 1986FI07, 1986KR12, 1986SA15, 1986SA1D, 1986VA13, 1987BA1I, 1987IM04, 1987KA09, 1987LE33, 1987TA06, 1987ZH1E, 1988US1A).

Special states: (1981PL1A, 1982PO12, 1983BU1B, 1983FI11, 1983HO22, 1983KU17, 1983VA31, 1984DU13, 1984DU17, 1984FI20, 1984OH01, 1984REZZ, 1984VA06, 1984VAZS, 1984ZW1A, 1985BA68, 1985FI1E, 1985GO11, 1985GO1A, 1986BA2J, 1986FI07, 1986SA15, 1986VA13, 1987KI1C, 1987SV1A, 1987WA36, 1987ZH1E, 1988KW02, 1988US1A, 1988ZH1B).

Electromagnetic transitions, giant resonances: (1983FI11, 1983GM1A, 1983KU17, 1984CH24, 1984DU17, 1984KA06, 1984KA04, 1984MO1D, 1984SH26, 1985FI1E, 1985GO23, 1985GO1A, 1985WA17, 1986ER1A, 1986FI07, 1986ME13, 1986VA13, 1987AR1E, 1987KI1C, 1987LE33, 1987ZH1E).

Astrophysical questions: (1982AU1A, 1982CA1A, 1982GR1A, 1982WA1B, 1983SI1B, 1983WA1H, 1984RA1E, 1984TR1C, 1984YA1A, 1985BO1E, 1985BO1K, 1985DE1E, 1985DE1K, 1985GI1C, 1985HO1A, 1985MI1E, 1985SC1C, 1985SC1D, 1985WA1K, 1986BO1H, 1986MA1U, 1986ME13, 1986PA1H, 1986RE1C, 1986RO1P, 1986SA1G, 1986SH1G, 1986SP1A, 1986WI1D, 1987AR1J, 1987AR1C, 1987AU1E, 1987CO1X, 1987DO1H, 1987DU1C, 1987FO1B, 1987HO1M, 1987KA1R, 1987KA1V, 1987MAZC, 1987MA2C, 1987PA1F, 1987RA1D, 1987RE1F, 1987RO25, 1987SP1C, 1987SP1D, 1988BA86, 1988KAZY, 1988KA07, 1988KA1H, 1988MEZS, 1988RE1B).

Complex reactions involving ⁷Li: (1982GU21, 1983CH23, 1983EF1A, 1983GU1A, 1983GU1B, 1983KH04, 1983KU1B, 1983LE1F, 1983MA53, 1983MU08, 1983NA08, 1983OL1A, 1983SI1A, 1983SO08, 1983ST1A, 1983UT01, 1984AI1A, 1984BE1E, 1984DA07, 1984EC01, 1984GR08, 1984HI1A, 1984IS02, 1984MO29, 1984RE14, 1984SH17, 1984SI15, 1984ST1B, 1984XI1B, 1985AG1A, 1985BH02, 1985FA02, 1985GL06, 1985GO20, 1985KI1C, 1985MA02, 1985MA13, 1985MC03, 1985MO17, 1985MO24, 1985SH1G, 1985WA1F, 1985WA22, 1985WO11, 1986AV1A, 1986BL12, 1986DAZP, 1986GL1E, 1986GO1F, 1986HA1B, 1986JO1A, 1986KA1C, 1986KA1G, 1986KO1L, 1986ME06, 1986MO1E, 1986NAZV, 1986RE13, 1986SAZL, 1986SA30, 1986SA1N, 1986SHZO, 1986SH1F, 1986SIZS, 1986SO10, 1986TA1F, 1986TA1G, 1986TA1M, 1986TU1A, 1986TU01, 1986WA1H, 1986WE1C, 1986YA1L, 1987AK1A, 1987AU1C, 1987BA38, 1987BE58, 1987BL13, 1987CH26, 1987COZZ, 1987DE37, 1987DO02, 1987FA02, 1987FE1A, 1987GL05, 1987GO17, 1987GR11, 1987HE1H, 1987JA06, 1987KI05, 1987KIZY, 1987MU03, 1987MU1D, 1987NA01, 1987NI04, 1987PO23, 1987SA04, 1987SH23, 1987SI1C, 1987SO13, 1987SO15, 1987ST01, 1987TAZU, 1987TE1D, 1987TR05, 1987WA09, 1987YA16, 1988BL09, 1988CA06, 1988CEZZ, 1988GO1H, 1988KA1L, 1988KI05, 1988KW02, 1988RU01, 1988SA19, 1988SH1E, 1988SH20, 1988ST06, 1988TA1A, 1988VA1E).

Polarization of ⁷Li: (1983HA1H, 1984JO1A, 1984NI01, 1985TU1A, 1985WE08, 1986CH1Q, 1986FR03, 1986ME13, 1986NO1C, 1986SA15, 1986ST1E, 1986TA1G, 1986TU01, 1987AR1E, 1987FI1D, 1987KA1I, 1987KA1V, 1987MU04, 1987SA04, 1988GR07, 1988KA02).

Applications: (1983AM1A, 1983AS03, 1983FI1C, 1983KU1C, 1984CA1D, 1984SA1E, 1984XI1A, 1985AD1B, 1985PA1A, 1986AU1A, 1986BE1J, 1986EN1A, 1986FI1D, 1986KL1B, 1986KR1C, 1986LI1J, 1986MA1S, 1986RA1D, 1986SA1M, 1986SC35, 1986ST1E, 1986ZA1C).

Muon and neutrino capture and reactions: (1983GM1A, 1984RO1B, 1985MAZZ, 1985RU01, 1986MA16, 1987KU23, 1987SU06, 1988AL1H).

Pion capture and reactions involving pions: (1982BA60, 1983AB1B, 1983AS1B, 1983AS1C, 1983BA26, 1983BA1A, 1983BA1G, 1983GE12, 1983GM1A, 1983HE17, 1983KA19, 1983PE14, 1983RA1D, 1983SE16, 1983SP06, 1984ABZY, 1984BA1T, 1984BA1U, 1984BO1H, 1984BU1D, 1984HU1C, 1984JI03, 1984ZA1A, 1985LA20, 1985IR01, 1985MO1F, 1986AN40, 1986AV08, 1986BA1C, 1986CE04, 1986CH1P, 1986DO01, 1986ER1A, 1986KA1J, 1986MO1J, 1986PA12, 1986PE05, 1986PR01, 1986RO03, 1986YO06, 1986ZO1A, 1987BA2F, 1987CH1D, 1987MA1I, 1987ROZY, 1988GIZU, 1988POZS).

Reactions involving kaons and other mesons: (1983BA71, 1983FE07, 1983GE13, 1983GE1C, 1984BA1M, 1984BO1H, 1984CH1H, 1984MO09, 1985GA1C, 1985KN1A, 1985MO1F, 1986BA1W, 1986CH1P, 1986DO01, 1986GA1H, 1986GA33, 1986HU1B, 1986KA1J, 1986MA1C, 1986MO1J, 1986ZO1A, 1987CH1D, 1987KN09, 1987PO1H, 1988HA44).

Reactions involving antiprotons: (1984GU06, 1985DU05, 1986DU10, 1986KO1E, 1986MO1J, 1987GR1I, 1987PO05).

Hypernuclei: (1982KA1D, 1982MO1B, 1983BA1M, 1983FE07, 1983MA64, 1983MO1C, 1983SH38, 1983SH1E, 1984AS1D, 1984BA1M, 1984BO1H, 1984CH1G, 1984CH1H, 1984HA1D, 1984MI1C, 1984MI1E, 1984MO09, 1984MO1H, 1984SH1J, 1984ZH1B, 1985AH1A, 1985KN1A, 1985KO1G, 1985MO1F, 1986AN1R, 1986BA1W, 1986CH1P, 1986DA1B, 1986ER1A, 1986GA1H, 1986HU1B, 1986MA1C, 1986ME1F, 1986YA1F, 1987KN09, 1987MI38, 1987PO1H, 1987WA36, 1987YA1M, 1988TA29).

Other topics: (1983FU1D, 1983PA06, 1983SH1D, 1984LO09, 1984OH01, 1985AN28, 1985GO23, 1985KA01, 1985TU1A, 1986DE1J, 1986GL1A, 1986GR1A, 1987AJ1A, 1987LE33, 1987SV1A, 1988BA1R, 1988FIZT, 1988GU1C, 1988KW02).

Coulomb excitation of ⁷Li: (1984SH17, 1984VE03, 1984VE08, 1986FA11).

Ground-state properties of ⁷Li: (1983ANZQ, 1983SR1C, 1983VA31, 1984AN1B, 1984CH24, 1984DU17, 1984GE05, 1984KA06, 1984MIZM, 1984NI01, 1984OH01, 1984PE12, 1984SH26, 1984VE03, 1985AN28, 1985BU02, 1985CL1A, 1985FI1E, 1985FU11, 1985GO1A, 1985HA18, 1985KL1B, 1985SA32, 1985WA17, 1986KO1U, 1986RO03, 1986SY1A, 1987AR1E, 1987HA30, 1987KA1U, 1987KA22, 1987KI1C, 1987SV1A, 1987TR1D, 1988JO1C, 1988KA02, 1988KA07, 1988POZS, 1988TA1D, 1988VA03, 1988WO04).

μ = +3.256424 (2) nm: see (1978LEZA).

Q = -40.6 ± 0.8 mb (1988DI1B). See (1988DI1B) for a review of earlier determinations, particularly those of (1984SU09, 1984VE03, 1984VE08, 1985WE08).

B(E2): 3/2^- → 1/2^- = 8.3 ± 0.5 e² · fm⁴ (1985WE08). See also (1984VE08), (1988TA1D) and (1984AJ01).

Isotopic abundance: (92.5 ± 0.2)% (1984DE53). See also (1987LA1J, 1988LA1C).

The interaction nuclear radius of ⁷Li is 2.23 ± 0.02 fm (1985TA18). [See also for derived nuclear matter, charge and neutron matter r.m.s. radii].

1. ³H(α, γ)⁷Li Q_m = 2.4678

Excitation functions and angular distributions have been studied for E_α = 0.5 to 2.0 MeV. The cross section rises smoothly as expected for a direct capture process: see (1966LA04) and (1987BU18; γ₀, γ₁). S(E) and the branching ratio DC → 478 DC → 0 have been measured by (1987SC18): S(0) = 0.14 ± 0.02 keV · b, including earlier measurements. Using S(0) = 0.100 keV · b, (1987KA1R) predict Big-Bang production of ⁷Li at all relevant densities and calculate the bounds on the mass density of the Universe from the observed ⁷Li abundance. For other astrophysical calculations see (1984WA11, 1984YA1A, 1985CA41, 1985DE1K, 1985KA1H, 1985KA1K, 1986KA45, 1986LA22, 1986ME13, 1988KA02, 1988KAZY, 1988KA07, 1988KA1H). See also (1984NE1B; applied) and (1984KA01; theor.).

2. ³H(α, n)⁶Li Q_m = -4.7823 E_b = 2.4678

The cross section for this reaction has been measured for E_α = 11 to 18 MeV: the data show the effect of ⁷Li*(7.46) and indicate a broad resonance near E_α = 16.8 MeV [⁷Li*(9.6)]. The level parameters derived from this reaction and from reaction 3 are displayed in Table 7.3 (in PDF or PS). The yield of ⁶Li ions at 0° (lab) has also been measured for E_α = 11.310 to 11.930 MeV with 2 - 3% accuracy: the data were then reduced to obtain the c.m. differential cross sections at 0° and 180° for the inverse reaction in the energy region corresponding to formation of ⁷Li*(7.46): see (1979AJ01). See also (1985CA41; astrophys.).

3. ³H(α, α)³H E_b = 2.4678

The excitation curves for the elastic scattering show the effects of ⁷Li*(4.63, 6.68, 7.46, 9.67). The derived level parameters are displayed in Table 7.3 (in PDF or PS). Angular distributions have been studied for E_α = 2.13 to 2.98 MeV and E_{pol. t} = 6.0 to 17 MeV [see (1979AJ01, 1984AJ01)] and at E_α = 56.3 to 95.5 MeV (1986YA1M; prelim.; also A_y]. A polarization extremum (A_y = -1) occurs near E_t = 11.1 MeV, θ = 95° : see (1984AJ01). For the breakup of ⁷Li into α + t in various processes see (1984AJ01) and (1984SH17, 1987FO08, 1987PO03) as well as "Complex reactions" in the "General section" here. For cross section calculations from an R-matrix calculation see (1987KN04).

For muon catalysis see (1984KR1B). See also (1981PL1A, 1983FI09, 1983FU11, 1983FU19, 1983HAYX, 1983LO09, 1984DU13, 1984FI20, 1984FU04, 1984HO1C, 1984KA01, 1984KR10, 1984LO1C, 1985FU01, 1985FU11, 1985SH22, 1986BA2J, 1986BO01, 1986KA30, 1986SA1D, 1988FIZT; theor.).

4. ⁴He(³He, π⁺)⁷Li Q_m = -137.119

⁷Li*(0 + 0.48, 4.63) have been populated at E(³He) = 266.5 and 280.5 MeV: see (1984AJ01). See also (1984GE05, 1987KA09; theor.).

5. ⁴He(α, p)⁷Li Q_m = -17.3462

Angular distributions have been reported at E_α = 39.9 to 140 MeV [see (1979AJ01, 1984AJ01)] and at 61.5 to 158.2 MeV (1982GL01) and 198.4 MeV (1985WO11) for the transitions to ⁷Li*(0, 0.48). See (1982GL01, 1985WO11) for a discussion of ⁷Li production in the Big Bang. See also ⁸Be and (1986KA26; theor.).

6. ⁶Li(n, γ)⁷Li Q_m = 7.2501
Q₀ = 7251.02 ± 0.09 keV (1985KO47)

The thermal capture cross section is 38.5 ± 3.0 mb (1981MUZQ). Gamma rays are observed corresponding to transitions to ⁷Li*(0, 0.48) with branching ratios (62 ± 2) and (38 ± 2)% (1985KO47). ⁷Li*(4.63, 6.68) are not populated [≤ 5%] (1985KO47). See (1979AJ01) for the earlier work. See also (1986AB1E). The decay of ⁷Li*(7.46) → ⁶Li_g.s. + n in the interaction of 35 MeV/A ¹⁴N ions on Ag is reported by (1987BL13).

7. ⁶Li(n, n)⁶Li E_b = 7.2501

The real coherent scattering length is 2.0 ± 0.1 fm; the complex scattering lengths are b₊ = (0.67 ± 0.14) - i(0.08 ± 0.01) fm, b_- = (4.67 ± 0.17) - i(0.62 ± 0.02) fm; σ_free = 0.70 ± 0.01 b (1983KO17). See also (1979GL12). (1983AL1E) report σ_s (below 10 keV) = 0.72 ± 0.02 b. See also (1981MUZQ). The total cross section has been measured from E_n = 4 eV to 49.6 MeV [see (1976GAYV, 1984AJ01)], at 0.6 to 80 keV (1982AL35) and at 0.08 to 3.0 MeV (1983KN1D; prelim.).

A pronounced resonance occurs at E_n = 244.5 ± 1.0 keV [E_x = 7459.5 ± 1.0 keV] with a peak cross section of 11.2 ± 0.2 b (1982SM02): see Table 7.4 (in PDF or PS). No other clearly defined resonance is observed to E_n = 49.6 MeV although the total cross section exhibits a broad maximum at E_n ≈ 4.5 MeV: see (1984AJ01). The analyzing power has been measured for E_{pol. n} = 1.48 to 5 MeV [see (1984AJ01)] and 5 to 17 MeV (1986PF1A; prelim.). Recent multi-level, multi-channel R-matrix analyses (1987KN04, 1983KN06) for E_n ≤ 8 MeV [using also data from other channels] include 13 normal and 14 non-normal parity states with E_x ≤ 17 MeV. [Only ten states have been seen directly in reaction or compound nucleus cross-section work.] Two positive-parity states provide an explanation for the anisotropy of the ⁶Li(n, α) work at low energies (1983KN06). For the results of an earlier R-matrix analysis see (1984AJ01). Cross sections for n₀ and n₁ have also been measured at E_n = 7.75 and 8.90 MeV (1987SC08).

The excitation function for 3.56 MeV γ-rays exhibits an anomaly, also seen in the (n, p) reaction (reaction 8). The data are well fitted assuming E_res = 3.50 and 4.60 MeV [E_x = 10.25 ± 0.10 and 11.19 ± 0.05 MeV], T = 1/2 and 3/2, Γ_c.m. = 1.40 ± 0.10 and 0.27 ± 0.05 MeV, respectively; both J^π = 3/2^-: see (1979AJ01) for a discussion of these and other (unpublished) data.

See also ⁶Li, (1984FE1A, 1985CH37, 1986DR10), (1983DA22, 1983GO1H, 1984SH1C, 1988MA1H), (1986BOZG; applications) and (1981PL1A, 1983FA17, 1983FU11, 1983FU19, 1984FU04, 1984WA1H, 1985FU01, 1985LI1F; theor.).

8. (a) ⁶Li(n, 2n)⁵Li Q_m = -5.67 E_b = 7.2501
(b) ⁶Li(n, p)⁶He Q_m = -2.725
(c) ⁶Li(n, d)⁵He Q_m = -2.37

For reaction (a) see (1985CH37, 1986CH24). The excitation function for reaction (b), measured from threshold to E_n = 8.9 MeV, exhibits an anomaly at E_n = 4.6 MeV. The excitation function, at forward angles, of p₀ is approximately constant for E_n = 4.4 to 7.25 MeV: see (1979AJ01). The excitation function, at forward angles, of deuterons (reaction (c)) increases monotonically for E_n = 5.4 to 6.8 MeV: see (1979AJ01). See also ⁵He, ⁶He, (1986WAZY), (1984SH1C, 1986AU1D, 1988MA1H), (1986BOZG; applications) and (1987KN04; theor.).

9. ⁶Li(n, α)³H Q_m = 4.7821 E_b = 7.2501

The isotopic thermal cross section is 940 ± 4 b: see (1981MUZQ). See also (1985SW01). A resonance occurs at E_n = 241 ± 3 keV with σ_max = 3.3 b: see (1986CA28, 1984AJ01). The resonance is formed by p-waves, J^π = 5/2^-, and has a large neutron width and a small α-width: see Table 7.4 (in PDF or PS). Above the resonance the cross section decreases monotonically to E_n = 18.2 MeV, except for a small bump near E_n ≈ 1.8 MeV and an inflection near E_n = 3.5 MeV. For a description of R-matrix analyses which suggest the location of higher states of ⁷Li, see reaction 7 and (1984AJ01), as well as (1987KN04).

Angular distributions have been measured at many energies in the range E_n = 0.1 to 14.1 MeV [see (1979AJ01, 1984AJ01)] as well as at 35 eV to 325 keV (1983KN03) and 2.16 to 4.20, 7.1 and 13.7 MeV (1986BA32, 1986BA68). Polarization measurements have been reported for E_{pol. n} = 0.2 to 2.4 MeV: the data suggest interference between s-waves and the p-wave resonance at 0.25 MeV. Interference between this 5/2^- state and a broad 3/2^- state 2 MeV higher also appears to contribute. At the higher energies A_y is close to +0.9 near 90° and varies slowly with E_n: see (1979AJ01). See also (1983VE10, 1984VEZW).

For a study of coincidences in the ⁶Li(n, αd)n reaction see (1986MI11). The triton production cross section at E_n = 14.92 MeV is 32 ± 3 mb (1985GO18). The total α production cross section [which includes the (n, nd) process] at E_n = 14.95 MeV is 512 ± 26 mb (1986KN06).

See also (1983AS1D, 1983CO1E, 1986CA29), (1984SH1C, 1985BO1D, 1986MI1G), (1984YA1A; astrophysics), (1984XI1A, 1985GO18, 1986BA2N, 1986BOZG, 1986BR1L, 1986CH1S, 1986CO1H, 1986FA13, 1986GO1K, 1986GR1F, 1986MA1R, 1986PE1K, 1986SA1R, 1986SA1H, 1986SE1D, 1986SU1J, 1986TA1H, 1986VE1A, 1986WI1B; applications) and (1986HA45; theor.).

10. ⁶Li(p, π⁺)⁷Li Q_m = -133.101

At E_p = 600 MeV, the reaction preferentially excites ⁷Li*(4.63). Angular distributions have been obtained for the pions to ⁷Li*(0, 0.48, 4.63) at E_p = 600 and 800 MeV. ⁷Li*(11.24) [T = 3/2] is not observed: see (1984AJ01). Recently σ(θ) and A_y measurements were reported at E_{pol. p} = 800 MeV (1987SO1C; prelim.). See also (1985LE19).

11. ⁶Li(d, p)⁷Li Q_m = 5.0255

Angular distributions of proton groups have been studied for E_d = 0.12 to 15 MeV and at 698 MeV: see (1966LA04, 1974AJ01, 1979AJ01, 1984AJ01). J^π of ⁷Li*(0.48) is 1/2^-. The two higher states have E_x = 4630 ± 9 and 7464 ± 10 keV, Γ_c.m. = 93 ± 8 and 91 ± 8 keV. The breakup reactions involve ⁷Li*(4.63, 7.46) and possibly ⁷Li*(9.6) [Γ = 0.5 ± 0.1 MeV]: see (1979AJ01). See also ⁸Be and (1988KO1C).

12. ⁶Li(⁶Li, ⁵Li)⁷Li Q_m = 1.58

See (1987MI34) and ⁵Li.

13. (a) ⁷Li(γ, n)⁶Li Q_m = -7.2501
(b) ⁷Li(γ, 2n)⁵Li Q_m = -12.92
(c) ⁷Li(γ, p)⁶He Q_m = -9.975
(d) ⁷Li(γ, pn)⁵He Q_m = -11.84
(e) ⁷Li(γ, d)⁵He Q_m = -9.62
(f) ⁷Li(γ, t)⁴He Q_m = -2.4678

The total photoneutron cross section rises sharply from 10 MeV to reach a broad plateau at about 15 mb from 14 to 20 MeV, decreases more slowly to about 0.5 mb at 25 MeV and then decreases further to about 0.3 mb at E_γ = 30 MeV (monoenergetic photons): there are indications of weak structure through the entire region: see (1979AJ01) and (1988DI02). [I am indebted to Prof. B.L. Berman for his comments.] A recent study by (1986SI18; E_b.s.) reports evidence for the excitation of ⁷Li*(7.46), as well as of states at E_x = 13.75 ± 0.03 and 14.65 ± 0.03 MeV with Γ ≈ 500 and 700 keV [and integrated cross sections of ≈ 0.14 and 0.17 MeV · mb], in addition to a major broad structure at 17 MeV. The integrated cross section to 23 MeV is 39 ± 4 MeV · mb for the n₀ transition and 17 ± 4 MeV · mb for the n₁ transition: together these account for 0.4 of the exchange augmented dipole sum of ⁷Li: see (1979AJ01). The integrated cross section for formation of ⁶Li*(3.56) is 4 ± 1 MeV · mb to 30 MeV and 11 ± 3 MeV · mb to 55 MeV: see (1984AJ01).

The total absorption cross section for natural Li in the range 10 to 340 MeV shows a broad peak at ≈ 30 MeV (σ_max ≈ 3 mb), a minimum centered at ≈ 150 MeV at ≈ 0.3 mb and a fairly smooth increase in cross section to ≈ 3 mb at ≈ 320 MeV: see (1984AJ01).

The cross section for the (γ, p) reaction (reaction (c)) shows a maximum at ≈ 15.6 MeV with a width of ≈ 4 MeV. It then decreases fairly smoothly to 27 MeV. The integrated cross section for 11 → 28 MeV is 13.2 ± 2.0 MeV · mb: see (1974AJ01, 1979AJ01, 1984AJ01). Differential cross sections for the (γ, n₀ + n₂) and (γ, p₀) processes are reported by (1983SE07, 1985SE17; E_γ = 48 to 141 MeV). Reaction (e) has been studied in the giant resonance region with E_bs ≤ 30 MeV. Deuteron groups to ⁵He_g.s. and possibly to the first excited state are reported. States of ⁷Li with E_x = 25 - 30 MeV may be involved when E_bs = 37 to 50 MeV is used: see (1979AJ01). At E_γ = 0.9 GeV, (1985RE1A) have studied π^- emission with the population of ⁶Li*(2.19).

The cross section for reaction (f) at 90° displays a broad resonance at E ≈ 7.7 MeV (Γ = 7.2 MeV) with an integrated cross section of 6.2 MeV · mb, a plateau for 12 → 22 MeV (at ≈ 0.6 the cross section at 7.7 MeV) and a gradual decrease to 48 MeV. The (γ, t) cross section integrated from threshold to 50 MeV is 8.1 MeV · mb: see (1984AJ01), and (1986VO20). See also (1985HA1H, 1986GO1M) and (1983BE45, 1983BO1B, 1983BU1A, 1983SR1B, 1984KR10, 1985GO1A, 1985ST1A, 1986AH03, 1986BA2G, 1987BU04, 1987KA1V, 1987KI1C, 1987KO43, 1987LU1B, 1987VA05, 1988SH20; theor.).

14. ⁷Li(γ, γ)⁷Li

See Table 7.4 (in PDF or PS) in (1966LA04) [summary of early measurements] for τ_m of ⁷Li*(0.48) = 107 ± 5 fsec. See also (1984AJ01), (1987BE1K) and (1986DU03; theor.).

15. (a) ⁷Li(e, e)⁷Li
(b) ⁷Li(e, ep)⁶He Q_m = -9.975
(c) ⁷Li(e, en)⁶Li Q_m = -7.2501

The electric form factor measurements for E_e = 100 to 600 MeV are well accounted for by a approxple harmonic-oscillator shell model with a quadrupole contribution described by an undeformed p-shell: r_r.m.s. = 2.39 ± 0.03 fm, |Q| = 42 ± 2.5 mb. From results obtained for E_e = 24.14 to 97.19 MeV, r_r.m.s. = 2.35 ± 0.10 fm (model independent), 2.29 ± 0.04 fm (shell model). A study of the ratio of the electric charge scattering from ⁶Li and from ⁷Li as a function of (momentum transfer)² yields < r² >^1/2₆/< r2 >^1/2₇ = 1.001 ± 0.008. The r.m.s. radius of the ground state magnetization density distribution, < r² >^1/2_M = 2.98 ± 0.05 fm. See (1979AJ01) for references.

Inelastic scattering studies show peaks corresponding to ⁷Li*(0.48, 4.63, 6.68, 7.46): see (1974AJ01) and Table 7.5 (in PDF or PS). Form factors for ⁷Li*(0, 0.48) have recently been studied at E_e = 80 to 680 MeV (1987LI1J; prelim.).

For quasi-elastic processes see (1984AJ01) and (1985SE17). See also (1983BE1A, 1987DE43) and (1984DO20, 1984DU13, 1984KA06, 1984KA04, 1984PE12, 1984SH26, 1985WA17, 1986BAYN, 1986DO11, 1986SA1D, 1987KA22, 1987SA1C, 1988BO05; theor.).

16. ⁷Li(π, π)⁷Li

⁷Li*(0, 0.48, 4.63, 6.68, 7.46, 9.67) have been populated in this reaction. Angular distributions have been measured at E_π⁺ = 49.7 MeV and E_π^± = 143 and 164.4 MeV: see (1984AJ01). Total and partial cross sections have been obtained for E_π^± in the range 85 → 315 MeV [see (1984AJ01)] and at E_π⁺ = 50 MeV (1983NA18). For the (π⁺, 2p) reaction see ⁵He (1986RI01). For studies of (π⁺, pd) and (π^±, pn) see (1986WH01) and (1986YO06), respectively. For π⁺ induced fission of ⁷Li see (1983BA26). See also the "GENERAL" section.

17. (a) ⁷Li(n, n)⁷Li
(b) ⁷Li(n, nt)⁴He Q_m = -2.4678

Angular distributions have been measured at E_n = 1.5 to 18 MeV [see (1979AJ01, 1984AJ01)] and at E_n = 5.4, 6.0, 14.2 MeV (1985CH37; n₀₊₁, n₂), 7 to 14 MeV (1983DA22; n₀), 8.0 and 24.0 MeV (1986HAZR; n₀ and n₂ at 24 MeV; prelim.), at 8.9 MeV (1984FE1A; n₀₊₁, n₂; prelim.) and at 14.7 MeV (1984SH01; n₀₊₁). Reaction (b) at E_n = 14.4 MeV proceeds primarily via ⁷Li*(4.63) although some involvement of ⁷Li*(6.68) may also occur: see (1979AJ01). See also ⁸Li, (1986LI15, 1987DE14, 1987SC08) and (1985CO18; applications).

18. (a) ⁷Li(p, p)⁷Li
(b) ⁷Li(p, 2p)⁶He Q_m = -9.975
(c) ⁷Li(p, pd)⁵He Q_m = -9.62
(d) ⁷Li(p, pn)⁶Li Q_m = -7.2501
(e) ⁷Li(p, pα)³H Q_m = -2.4678

Angular distributions of protons have been measured for E_p = 1.0 to 185 MeV [see (1974AJ01, 1984AJ01)] and at E_{pol. p} = 1.89 to 2.59 MeV (1986SA1P; p₀; prelim.). Inelastic proton groups have been observed to ⁷Li*(0.48, 4.63, 7.46, 9.6): see (1952AJ38, 1974AJ01). Double differential cross sections for the continuum are reported at E_{pol. p} = 65 MeV (1987TO06; prelim.).

For reaction (b) see (1984PA1B, 1985PA1B; 50 - 100 MeV; prelim.) and (1985BE30, 1985DO16; 1 GeV). See also ⁶He and (1984AJ01). For reaction (c) see (1986WA11). For reaction (d) see (1985BE30) and ⁶Li. Reaction (d) has been studied at E_p = 200 MeV: the deuteron spectroscopic factor is close to unity and the results indicate that the deuteron cluster momentum distribution is characterized, at small momentum, by a FWHM of 140 MeV/c. Cross sections for the (p, pt) reaction (reaction (e)) are very small but are consistent with a spectroscopic factor of unity for t + ⁴He in ⁷Li (1986WA11). For reaction (e) see also (1983GO06, 1985PA04, 1985PAZL). See also ⁵He and (1984AJ01).

See also ⁸Be, (1983AN18, 1983GLZZ, 1986SH1P, 1987GAZM, 1987PA1G), (1983CH1B, 1987LE33), (1986HA1T; applications) and (1984GU14, 1985KA1D, 1985PA03, 1986IM1A, 1987IM1F, 1987IM04, 1987VD01; theor.).

19. ⁷Li(d, d)⁷Li

Angular distributions have been reported for E_d = 1.0 to 28 MeV [see (1974AJ01, 1979AJ01)] and at 50 MeV (1988KO1C; prelim.). See also ⁹Be and (1987GOZF) for a breakup study.

20. (a) ⁷Li(³He, ³He)⁷Li
(b) ⁷Li(³He, pd)⁷Li Q_m = -5.49353

Angular distributions have been reported at E(³He) = 11 MeV to 44.0 MeV and at E(³pol. He) = 33.3 MeV: see (1974AJ01, 1984AJ01). The missing mass spectrum in reaction (b) at E(³He) = 120 MeV indicate, in addition to the unresolved group to ⁷Li*(0, 0.48), a small peak at E_x = 17.8 ± 0.5 MeV, possibly some structure between 30 and 40 MeV, a peak at 40.5 ± 0.5 MeV (Γ ≈ 2 - 3 MeV) and possibly some structure at higher energies (1985FR01). For pion production see (1984BR22).

21. (a) ⁷Li(α, α)⁷Li
(b) ⁷Li(α, 2α)³H Q_m = -2.4678

Angular distributions (reaction (a)) have been reported for E_α = 3.6 to 29.4 MeV [see (1974AJ01, 1984AJ01)] and at E_α = 35.3 MeV (1985DI08; α to ⁷Li*(0, 0.48, 4.63, 6.68, 7.46, 9.67); collective coupled channel analysis). See also (1987BU27).

Reaction (b) has been studied at E_α = 18 to 64.3 MeV [see (1974AJ01, 1984AJ01)] and at 27.2 MeV (1985KO29). ⁷Li*(4.63) is strongly involved in the sequential decay, as are possibly ⁷Li*(6.68, 7.46). See also (1987DM1C, 1987VA29, 1988DM1A), (1988BO46) and (1986ZE01, 1987KO1L; theor.).

22. (a) ⁷Li(⁶Li, ⁶Li)⁷Li
(b) ⁷Li(⁷Li, ⁷Li)⁷Li

For reaction (a) see ⁶Li. The elastic angular distribution (reaction (b)) has been studied for E(⁷Li) = 4.0 to 6.5 MeV [see (1974AJ01)] and 2.0 to 5.5 MeV (1983NO08).

23. ⁷Li(⁹Be, ⁹Be)⁷Li

Elastic angular distributions have been measured at E(⁷Li) = 34 MeV [see (1979AJ01)] and at 78 MeV (1986GLZU, 1986GLZV; also to ⁷Li*(4.63)). For the interaction cross section at 790 MeV/A see (1985TA18).

24. (a) ⁷Li(¹⁰B, ¹⁰B)⁷Li
(b) ⁷Li(¹¹B, ¹¹B)⁷Li

For reaction (a) see ¹⁰B. Angular distributions have been studied for reaction (b) to ⁷Li*(0, 0.48) and at E(⁷Li) = 34 MeV (1987CO02, 1987CO16). See also (1987HNZZ; theor.).

25. (a) ⁷Li(¹²C, ¹²C)⁷Li
(b) ⁷Li(¹³C, ¹³C)⁷Li

Angular distributions (reaction (a)) involving ⁷Li*(0, 0.48) have been studied at E(⁷Li) = 4.5 to 89 MeV [see (1975AJ02, 1979AJ01, 1984AJ01)] and at E(⁷Li) = 53.8 MeV and E(¹²C) = 92.3 MeV (1984VI02, 1986CO02; also to ⁷Li*(4.63)) and at E(⁷Li) = 131.8 MeV (1988KA09; ⁷Li*(0 + 0.48); and various states in ¹²C) as well as at E(⁷pol. Li) = 21.1 MeV (1984MO06; elastic). See also (1986GLZU) and ¹²C in (1985AJ01, 1990AJ01). Breakup studies involving ⁷Li*(4.63) are reported at E(⁷Li) = 70 MeV (1986DAZP, 1986YOZU; prelim.) and 132 MeV (1986SHZP; prelim.). The interaction cross section on carbon at 790 MeV/A has been measured by (1985TA18).

The elastic scattering in reaction (b) has been studied for E(⁷Li) = 4.5 to 34 MeV [see ¹³C in (1986AJ01)] and recently by (1987CO02, 1987CO16; 34 MeV; also to ⁷Li*(0.48)). See also (1983STZS), (1983BI13, 1984HA53, 1986KA1C, 1986MO1E, 1987PA12) and (1980KH09, 1982GU21, 1983KH1A, 1984BE35, 1984GR05, 1984UH1A, 1985HE25, 1985KH08, 1985SA13, 1986KA1B, 1986SA15, 1986SAZL, 1986SA1D, 1986YO1A, 1987AR13, 1987KA1I, 1987SA1C, 1988OT01, 1988SA10; theor.).

26. (a) ⁷Li(¹⁴N, ¹⁴N)⁷Li
(b) ⁷Li(¹⁵N, ¹⁵N)⁷Li

Elastic angular distributions (reaction (a)) are reported at E(⁷Li) = 36 MeV [see (1981AJ01)] and E(¹⁴N) = 150 MeV (1986GO1H) while those for reaction (b) have been studied at E(⁷Li) = 28.8 MeV [see ¹⁵N in (1986AJ01)].

27. ⁷Li(¹⁶O, ¹⁶O)⁷Li

The elastic scattering has been studied at E(⁷Li) = 9.0 to 20 and at 68 MeV [see ¹⁶O in (1986AJ04)] as well as at E(⁷Li) = 50 MeV (1984CO20). For fusion cross section and breakup studies see (1984MA28, 1986MA19, 1986SC28, 1988MA07). See also (1982GU21, 1988PR02; theor.).

28. ⁷Li(²⁰Ne, ²⁰Ne)⁷Li

Angular distributions have been studied at E(⁷Li) = 36, 68 and 89 MeV: see ²⁰Ne in (1983AJ01).

29. (a) ⁷Li(²⁴Mg, ²⁴Mg)⁷Li
(b) ⁷Li(²⁵Mg, ²⁵Mg)⁷Li
(c) ⁷Li(²⁶Mg, ²⁶Mg)⁷Li
(d) ⁷Li(²⁷Al, ²⁷Al)⁷Li

The elastic scattering has been studied at E(⁷Li) = 89 MeV and at 27 MeV (reaction (b)): see (1984AJ01). A study of the breakup on ²⁷Al is reported by (1986NAZV) and the interaction cross section at 790 MeV/A has been measured by (1985TA18). See also (1988OT01, 1988SA10; theor.).

30. (a) ⁷Li(²⁸Si, ²⁸Si)⁷Li
(b) ⁷Li(⁴⁰Ca, ⁴⁰Ca)⁷Li
(c) ⁷Li(⁴⁸Ca, ⁴⁸Ca)⁷Li

Angular distributions involving ⁷Li*(0, 0.48) and various states of ²⁸Si and ⁴⁰Ca have been studied at E(⁷Li) = 45 MeV. The elastic scattering on ⁴⁰Ca and ⁴⁸Ca has been studied at E(⁷Li) = 28, 34 and 89 MeV [the latter also to ⁷Li*(0.48)]: see (1984AJ01). Angular distributions (reaction (b)) involving ⁷Li*(0, 0.48) have also been reported at E(⁷Li) = 34 MeV (1985SA25). See also (1985GO11, 1986SA1D, 1987SA1C; theor.).

31. ⁷Be(ε)⁷Li Q_m = 0.862

The decay proceeds to the ground and 0.48 MeV states. The branching ratio to ⁷Li*(0.48) is (10.52 ± 0.06)%: see Table 7.6 (in PDF or PS) and (1984AJ01). The adopted half-life is 53.29 ± 0.07 d. Both transitions are superallowed: log ft = 3.32 and 3.55 for the decays to ⁷Li*(0, 0.48). See also (1979AJ01). The first-excited state has E_x [from E_γ] = 477.612 ± 0.002 keV: see (1984AJ01). See also (1983TAZY), (1982BA1J, 1983FO1A, 1983VO1C, 1984BO1C, 1984DA1H, 1984HA1M, 1984SU1A, 1985BA1N, 1985BA1M, 1985CA41, 1985DE1H, 1985KR1B, 1986GR04, 1986HA1I, 1986RO1N, 1987AR1J, 1987BA89, 1987FR1C, 1987KR10, 1987RI1E, 1987RO25, 1987WE1C, 1988BA86, 1988FO1A; astrophysics) and (1983WA13, 1983WA1J, 1986DU1E, 1986HA1Q, 1987DR1A; theor.).

32. ⁹Be(π^-, 2n)⁷Li Q_m = 119.866

The capture of stopped pions has been studied in a kinematically complete experiment: ⁷Li*(0, 0.48) are weakly populated. Two large peaks are attributed to the excitation of ⁷Li*(7.46, 10.25). The recoil momentum distributions corresponding to these peaks are rather approxilar and both indicate a strong L = 0 component: see (1979AJ01).

33. ⁹Be(n, t)⁷Li Q_m = -10.4378

An angular distribution is reported at E_n = 14.6 MeV (1987ZA01; t₀₊₁). See also (1979AJ01) and ¹⁰Be.

34. (a) ⁹Be(p, ³He)⁷Li Q_m = -11.2016
(b) ⁹Be(p, pd)⁷Li Q_m = -16.6951

At E_p = 43.7 MeV angular distributions have been obtained for the ³He particles corresponding to ⁷Li*(0, 0.48, 4.63, 7.46). The 7.46 MeV state is strongly excited while the mirror state in ⁷Be is not appreciably populated in the mirror reaction (see reaction 17 in ⁷Be). The angular distribution indicates that the transition to ⁷Li*(7.46) involves both L = 0 and 2, with a somewhat dominant L = 0 character. The J^π = 3/2^-, T = 3/2 state is located at E_x = 11.28 ± 0.04 MeV, Γ = 260 ± 50 keV: see (1979AJ01). Reaction (b) at E_p = 58 MeV involved ⁷Li*(0, 0.48, 7.47) (1985DE17). See also (1987KA25).

35. (a) ⁹Be(d, α)⁷Li Q_m = 7.1516
(b) ⁹Be(d, t)⁴He⁴He Q_m = 4.6838

Angular distributions have been measured for E_d = 0.4 to 27.5 MeV [see (1966LA04, 1974AJ01, 1979AJ01)] and at E_{pol. d} = 2.0 to 2.8 MeV (1984AN16; α₀, α₁). A study at 11 MeV finds Γ_c.m. = 93 ± 25 and 80 ± 20 keV, respectively for ⁷Li*(4.63, 7.46). No evidence is found for the T = 3/2 state ⁷Li*(11.25). In a kinematically complete study of reaction (b) at E_d = 26.3 MeV, ⁷Li*(4.6, 6.5 + 7.5, 9.4) are strongly excited. No sharp α-decaying states of ⁷Li are observed with 10 < E_x < 25 MeV. Parameters for ⁷Li*(9.7) are E_x = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV: see (1979AJ01). [E_x = 6.75 ± 0.20 MeV, Γ = 0.87 ± 0.20 MeV (1986PAZN; prelim.)]. A study of inclusive α-spectra at E_d = 50 MeV has been reported by (1987KA17) who suggest the involvement of a ⁷Li state at E_x = 18 ± 1 MeV, Γ = 5 ± 1 MeV. For reaction (b) see also (1987VA29). See also (¹¹B in 1985AJ01) and (1988NE1A; theor.).

36. (a) ⁹Be(⁶Li, ⁸Be)⁷Li Q_m = 5.585
(b) ⁹Be(⁹Be, ¹¹B)⁷Li Q_m = -0.8798

Angular distributions involving ⁷Li*(0, 0.48) have been reported at E(⁶Li) = 32 MeV (1985CO09) and E(⁹Be) = 14 MeV (1985JA09).

37. ¹⁰B(n, α)⁷Li Q_m = 2.7905

Angular distributions of α₀, α₁ and of α₂ at the higher energies have been measured at E_n = 2 keV to 14.4 MeV: see (1979AJ01, 1984AJ01). τ_m (0.48) = 102 ± 5 fsec (1985KO47). A search for an asymmetry of α-particles emitted forward and backward with respect to the neutron spin (due to parity non-conserving effects) gives upper limits of 3.7 × 10^-6 and 6.1 × 10^-7 for the α₀ and α₁ groups, respectively (1986ER05). For other polarization studies (involving both n and ¹⁰B) see (1986KO19) and ¹¹B in (1990AJ01). See also (1986CO1M; applications).

38. ¹⁰B(d, ⁵Li)⁷Li Q_m = -1.40

See ⁵Li.

39. ¹⁰B(α, ⁷Be)⁷Li Q_m = -16.200

Angular distributions involving ⁷Li_g.s. and ⁷Be_g.s. and ⁷Li*(0.48) + ⁷Be*(0.43) have been studied at E_α = 91.8 MeV (1985JA12, 1986JA03). See also (1988SH1E; theor.).

40. ¹¹Be(β^-)¹¹B* → ⁷Li + α Q_m = 1.216

Delayed α-particles have been observed in the β^- decay of ¹¹Be: they are due to the decay of ¹¹B*(9.88) [J^π = 3/2⁺]. This state decays by α-emission (87.4 ± 1.2)% to the ground state of ⁷Li and (12.6 ± 1.2)% to ⁷Li*(0.48) (1981AL03). See also ¹¹Be, ¹¹B in (1985AJ01).

41. ¹¹B(³He, ⁷Be)⁷Li Q_m = -7.076

Angular distributions involving ⁷Li_g.s. and ⁷Be_g.s. and ⁷Li*(0.48) + ⁷Be*(0.43) have been studied at E(³He) = 71.8 MeV (1986JA02, 1986JA03). See also (1987KW01, 1987KW03; theor.).

42. ¹¹B(α, ⁸Be)⁷Li Q_m = -8.7556

Angular distributions have been measured at E_α = 27.2 to 29.0 MeV and at 65 MeV. At E_α = 65 and 72.5 MeV, ⁷Li*(0, 4.63) are very strongly populated while ⁷Li*(0.48, 6.68, 7.46) are weakly excited: see (1979AJ01, 1984AJ01).

43. ¹²C(d, ⁷Be)⁷Li Q_m = -17.540

Angular distributions involving ⁷Li_g.s. and ⁷Be_g.s. and ⁷Li*(0.48) + ⁷Be*(0.43) have been studied at E_d = 39.8 MeV [see (1979AJ01)] and at 78.0 MeV (1986JA03, 1986JA15). See also (1984NE1A) and (1987KW01, 1987KW03; theor.).

44. ¹²C(t, ⁸Be)⁷Li Q_m = -4.8988

Angular distributions have been studied at E_t = 38 MeV to ⁸Be_g.s. and ⁷Li*(0, 0.48) (1986SIZS; prelim.).

45. ¹²C(α, ⁹B)⁷Li Q_m = -24.898

Angular distributions are reported at E_α = 49.0 and 80.1 MeV (1984GO03). See also (1984AJ01).

46. ¹²C(⁶Li, ¹¹C)⁷Li Q_m = -11.472

Angular distributions have been obtained at E(⁶Li) = 36 MeV for the transitions to ⁷Li*(0, 0.48): see (1979AJ01). See also (1986GL1E).

47. ¹³C(d, ⁸Be)⁷Li Q_m = -3.5879

At E_d = 14.6 MeV angular distributions are reported for the transitions to ⁷Li*(0, 0.48) and ⁸Be_g.s.: see (1979AJ01). See also (1984NE1A, 1984SH1D).

48. ¹⁴N(n, 2α)⁷Li Q_m = -8.8220

At E_n = 14.1 MeV, ⁷Li*(0, 0.48) are approximately equally populated: see (1979AJ01). Differential cross sections have been measured at E_n = 14.4 and 18.2 MeV involving ⁸Be_g.s. and ⁷Li*(0 + 0.48, 4.63) (1986TU02).

49. (a) ¹⁷O(d, ¹²C)⁷Li Q_m = -2.5803
(b) ¹⁸O(d, ¹³C)⁷Li Q_m = -5.678
(c) ¹⁹F(d, ¹⁴N)⁷Li Q_m = -6.1220

At E_d = 14.6 to 15.0 MeV, angular distributions have been measured for the transitions to ¹²C(0) + ⁷Li*(0, 0.48) [reaction (a)], ¹³C(0) + ⁷Li*(0, 0.48) [reaction (b)] and ¹⁴N(0) + ⁷Li*(0, 0.48) [reaction (c)]: see (1979AJ01). See also 1984AJ01).