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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 Qm = 2.4678

Excitation functions and angular distributions have been studied for Eα = 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 Qm = -4.7823 Eb = 2.4678

The cross section for this reaction has been measured for Eα = 11 to 18 MeV: the data show the effect of 7Li*(7.46) and indicate a broad resonance near Eα = 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 Eα = 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 Eb = 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 Eα = 2.13 to 2.98 MeV and Epol. t = 6.0 to 17 MeV [see (1979AJ01, 1984AJ01)] and at Eα = 56.3 to 95.5 MeV (1986YA1M; prelim.; also Ay]. A polarization extremum (Ay = -1) occurs near Et = 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 Qm = -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 Qm = -17.3462

Angular distributions have been reported at Eα = 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 Qm = 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) → 6Lig.s. + n in the interaction of 35 MeV/A 14N ions on Ag is reported by (1987BL13).

7. 6Li(n, n)6Li Eb = 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; σfree = 0.70 ± 0.01 b (1983KO17). See also (1979GL12). (1983AL1E) report σs (below 10 keV) = 0.72 ± 0.02 b. See also (1981MUZQ). The total cross section has been measured from En = 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 En = 244.5 ± 1.0 keV [Ex = 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 En = 49.6 MeV although the total cross section exhibits a broad maximum at En ≈ 4.5 MeV: see (1984AJ01). The analyzing power has been measured for Epol. 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 En ≤ 8 MeV [using also data from other channels] include 13 normal and 14 non-normal parity states with Ex ≤ 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 En = 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 Eres = 3.50 and 4.60 MeV [Ex = 10.25 ± 0.10 and 11.19 ± 0.05 MeV], T = 1/2 and 3/2, Γc.m. = 1.40 ± 0.10 and 0.27 ± 0.05 MeV, respectively; both Jπ = 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 Qm = -5.67 Eb = 7.2501
(b) 6Li(n, p)6He Qm = -2.725
(c) 6Li(n, d)5He Qm = -2.37

For reaction (a) see (1985CH37, 1986CH24). The excitation function for reaction (b), measured from threshold to En = 8.9 MeV, exhibits an anomaly at En = 4.6 MeV. The excitation function, at forward angles, of p0 is approximately constant for En = 4.4 to 7.25 MeV: see (1979AJ01). The excitation function, at forward angles, of deuterons (reaction (c)) increases monotonically for En = 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 Qm = 4.7821 Eb = 7.2501

The isotopic thermal cross section is 940 ± 4 b: see (1981MUZQ). See also (1985SW01). A resonance occurs at En = 241 ± 3 keV with σmax = 3.3 b: see (1986CA28, 1984AJ01). The resonance is formed by p-waves, Jπ = 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 En = 18.2 MeV, except for a small bump near En ≈ 1.8 MeV and an inflection near En = 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 En = 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 Epol. 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 Ay is close to +0.9 near 90° and varies slowly with En: 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 En = 14.92 MeV is 32 ± 3 mb (1985GO18). The total α production cross section [which includes the (n, nd) process] at En = 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 Qm = -133.101

At Ep = 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 Ep = 600 and 800 MeV. 7Li*(11.24) [T = 3/2] is not observed: see (1984AJ01). Recently σ(θ) and Ay measurements were reported at Epol. p = 800 MeV (1987SO1C; prelim.). See also (1985LE19).

11. 6Li(d, p)7Li Qm = 5.0255

Angular distributions of proton groups have been studied for Ed = 0.12 to 15 MeV and at 698 MeV: see (1966LA04, 1974AJ01, 1979AJ01, 1984AJ01). Jπ of 7Li*(0.48) is 1/2-. The two higher states have Ex = 4630 ± 9 and 7464 ± 10 keV, Γc.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 Qm = 1.58

See (1987MI34) and 5Li.

13. (a) 7Li(γ, n)6Li Qm = -7.2501
(b) 7Li(γ, 2n)5Li Qm = -12.92
(c) 7Li(γ, p)6He Qm = -9.975
(d) 7Li(γ, pn)5He Qm = -11.84
(e) 7Li(γ, d)5He Qm = -9.62
(f) 7Li(γ, t)4He Qm = -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 Eγ = 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; Eb.s.) reports evidence for the excitation of 7Li*(7.46), as well as of states at Ex = 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 (σmax ≈ 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; Eγ = 48 to 141 MeV). Reaction (e) has been studied in the giant resonance region with Ebs ≤ 30 MeV. Deuteron groups to 5Heg.s. and possibly to the first excited state are reported. States of 7Li with Ex = 25 - 30 MeV may be involved when Ebs = 37 to 50 MeV is used: see (1979AJ01). At Eγ = 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 τm 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 Qm = -9.975
(c) 7Li(e, en)6Li Qm = -7.2501

The electric form factor measurements for Ee = 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: rr.m.s. = 2.39 ± 0.03 fm, |Q| = 42 ± 2.5 mb. From results obtained for Ee = 24.14 to 97.19 MeV, rr.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 >1/2M = 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 Ee = 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 Eπ+ = 49.7 MeV and Eπ± = 143 and 164.4 MeV: see (1984AJ01). Total and partial cross sections have been obtained for Eπ± in the range 85 → 315 MeV [see (1984AJ01)] and at Eπ+ = 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 Qm = -2.4678

Angular distributions have been measured at En = 1.5 to 18 MeV [see (1979AJ01, 1984AJ01)] and at En = 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 En = 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 Qm = -9.975
(c) 7Li(p, pd)5He Qm = -9.62
(d) 7Li(p, pn)6Li Qm = -7.2501
(e) 7Li(p, pα)3H Qm = -2.4678

Angular distributions of protons have been measured for Ep = 1.0 to 185 MeV [see (1974AJ01, 1984AJ01)] and at Epol. 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 Epol. 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 Ep = 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 Ed = 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 Qm = -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 Ex = 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 Qm = -2.4678

Angular distributions (reaction (a)) have been reported for Eα = 3.6 to 29.4 MeV [see (1974AJ01, 1984AJ01)] and at Eα = 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 Eα = 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 Qm = 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 Ex [from Eγ] = 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 Qm = 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 Qm = -10.4378

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

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

At Ep = 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 Jπ = 3/2-, T = 3/2 state is located at Ex = 11.28 ± 0.04 MeV, Γ = 260 ± 50 keV: see (1979AJ01). Reaction (b) at Ep = 58 MeV involved 7Li*(0, 0.48, 7.47) (1985DE17). See also (1987KA25).

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

Angular distributions have been measured for Ed = 0.4 to 27.5 MeV [see (1966LA04, 1974AJ01, 1979AJ01)] and at Epol. d = 2.0 to 2.8 MeV (1984AN16; α0, α1). A study at 11 MeV finds Γc.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 Ed = 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 < Ex < 25 MeV. Parameters for 7Li*(9.7) are Ex = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV: see (1979AJ01). [Ex = 6.75 ± 0.20 MeV, Γ = 0.87 ± 0.20 MeV (1986PAZN; prelim.)]. A study of inclusive α-spectra at Ed = 50 MeV has been reported by (1987KA17) who suggest the involvement of a 7Li state at Ex = 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 Qm = 5.585
(b) 9Be(9Be, 11B)7Li Qm = -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 Qm = 2.7905

Angular distributions of α0, α1 and of α2 at the higher energies have been measured at En = 2 keV to 14.4 MeV: see (1979AJ01, 1984AJ01). τm (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 Qm = -1.40

See 5Li.

39. 10B(α, 7Be)7Li Qm = -16.200

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

40. 11Be(β-)11B* → 7Li + α Qm = 1.216

Delayed α-particles have been observed in the β- decay of 11Be: they are due to the decay of 11B*(9.88) [Jπ = 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 Qm = -7.076

Angular distributions involving 7Lig.s. and 7Beg.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 Qm = -8.7556

Angular distributions have been measured at Eα = 27.2 to 29.0 MeV and at 65 MeV. At Eα = 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 Qm = -17.540

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

44. 12C(t, 8Be)7Li Qm = -4.8988

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

45. 12C(α, 9B)7Li Qm = -24.898

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

46. 12C(6Li, 11C)7Li Qm = -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 Qm = -3.5879

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

48. 14N(n, 2α)7Li Qm = -8.8220

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

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

At Ed = 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).