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13B (76AJ04)(See Energy Level Diagrams for 13B) GENERAL: See also (70AJ04) and Table 13.1 [Table of Energy Levels] (in PDF or PS). Special reactions:(AR71, KO73F, AB75A, FO75H). Theoretical papers:(AN72B, KI73K, MU73J, MU73M, NA73I, NA73K, SA73S, WI73J, BE75Q, HU75G).
See also (TO73G).
The half-life of 13B is 17.33 ± 0.17 msec (WI71F), 17.6 ± 0.4 msec (MA62D): the mean value is 17.36 ± 0.16 msec (WI71F). This value leads to (ft)+/(ft)- = 1.166 ± 0.026 (see 13O). The induced tensor coupling constant, gIT = (2.6 ± 0.5) x 10-3 (WI71F). The branching ratios to various 13C states are shown in Table 13.2 (in PDF or PS) (MA62D, JO69E, AL74E): they indicate Jπ = 1/2- or 3/2- for 13Bg.s.. See also (AL74) and (WI71K, WI72L, HA73M, KU73N, MA73W, TO73F, WI73D, CH74P, GR75, WI75D; theor.).
Observed proton groups are shown in Table 13.3 (in PDF or PS) (MO59E, CA63D, WY72). Angular distribution measurements have been reported by (CA69B; p0, p1+2, p3+4, p5, p7). The lifetimes of 13B*(3.53, 3.71, 4.13) are, repectively, > 0.3, < 0.38 and 0.062 ± 0.050 psec: Eγ = 3536.3 ± 4.2 and 4133.4 ± 7.8 keV (TH69A). See also 14C.
Observed proton groups are displayed in Table 13.3 (in PDF or PS). Angular distributions have been measured at Et = 11 MeV (MI64E) and 23 MeV (AJ75A). See also (70AJ04) and (WI71A).
At Ed = 52 MeV angular distributions for 13B*(0, 3.7) have been
reported (MA75Y).
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