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13B (1991AJ01)(See Energy Level Diagrams for 13B)
GENERAL: See also (1986AJ01) and Model calculations: (1988WO04, 1989PO1K, 1989WO1E). Complex reactions involving 13B: (1985BO1A, 1986AV1B, 1986BI1A, 1986UT01, 1987AN1A, 1987BA38, 1987SA25, 1987VI02, 1988CA06, 1988RU01, 1988SA19, 1989KI13, 1989SA10, 1989YO02, 1990HA46). Muon and neutrino capture and reactions: (1985KO39). Pion capture and reactions (See also reactions 5 and 6): (1985SA06, 1988HA12, 1989JE02). Hypernuclei: (1986FE1A, 1986ME1F, 1986WU1D, 1988MA1G, 1989BA92). Antinucleon interactions: (1988MA48). Other topics: (1985AN28, 1986AN07). Ground-state properties of 13B: (1985AN28, 1988VA03, 1988WO04, 1989SA10, 1989WO1E, 1990LO10).
μ = +3.17778(51) nm (1978LEZA). Interaction cross sections at 790 MeV/A for 13B ions with Be, C, and Al are reported by (1988TA10). The interaction radius and the r.m.s. radius for the nucleon distribution in 13B have also been derived (1988TA10).
The half-life of 13B is 17.36 ± 0.16 ms: see (1981AJ01). See also (1988SA04). The branching
ratios to various 13C states are shown in
Observed proton and γ-ray groups are shown in
Observed proton groups are displayed in
See (1986VO02, 1988VO06) and 12N in (1990AJ01).
At Ee = 195 MeV the 13B Ex region to 12 MeV has been
studied by (1983MI06):
they find that the photopion reaction predominantly excites M2 states at low q and M4
states at high q. Fits to the data are obtained by assuming the excitation of
13Bg.s. and 13B*(3.5, 6.4, 9.0) [the latter are clearly
due to unresolved groupings of levels]. Comparisons are made with the 13C(e,
e') work in the analog region in 13C (1983MI06). [For T = 3/2
states see
Gamma rays have been observed which are associated with the 13B ground state; an unresolved doublet at Ex ≈ 3.5 - 3.7 MeV; sharp states at Ex ≈ 6.5 and 7.6 MeV; a broad level (or unresolved levels) at ≈ 10.2 MeV (1983MA16; see for radiative capture branching ratios). The analogs of the peaks at Ex = 6.5, 7.6 and 10.2 MeV, calculated to be at 13C*(21.6, 22.7, 25.3), are attributed to a ΔL = 1, ΔS = 1, ΔT = 1 spin-isospin giant dipole resonance of 13C (1983MA16). See also the "General" section.
The 0° ground-state differential cross section has been measured at En = 198 MeV (1988JA01). At En = 65 MeV, 13B*(0, 3.5) and the region from 6 - 10 MeV have been studied (1986WAZU; prelim.). See also (1986FO1E, 1987BR32, 1989SOZY, 1989SOZW) and (1986ALZJ).
At Ed = 70 MeV the angular distribution to 13Bg.s. has been reported. Structures at Ex = 3.8, 5.2, 6.6 MeV are also observed. For VAP measurements see 15N (1986MO27).
At E(7Li) = 21 MeV/A, forward angular distributions are reported to 13Bg.s. and to unresolved structures at 3.5, 4.0, 5.1, 6.3, 7.0 and 7.6 MeV, and to a broad (Γ ≈ 2.3 MeV) structure at 9.5 MeV. The latter is suggested to be due to the GDR (1990NA03) [see for possible Jπ assignments].
See (1987GO09; theor.).
See (1986AJ01).
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