Energy Levels of Light Nuclei A = 14 - Triangle Universities Nuclear ...

14 B
(Figs. 1 and 5)
GENERAL (See also (86AJ01)).
Complex reactions involving 14 B: (86BI1A, 87SA25, 88AS1C, 88RU01, 89AS1B, 89YO02)
Pion capture and reactions: (83AS01, 84AS05)
Hypernuclei: (86ME1F, 88MA1G, 89BA92)
Other topics: (84VA06, 86AN07, 89PO1K, 90RE04)
Ground state of 14 B: (87VA26, 90LO10)
Interaction cross sections at 790 MeV/A for 14 B ions on Be, C and Al are reported by (88TA10)
[see also for interaction and r.m.s. radii for the nucleon distribution in 14 B]. See also (89SA10).
1. 14 B(β − ) 14 C Q m =20.64
14 Bhasahalf-lifeof16.1 ± 1.2 ms(74AL11), 12.8 ± 0.8 ms(86CU01): the weighted mean is
13.8 ± 1.0 ms and we adopt it. The nature of the decay [see Table 14.2] fixesJ π of 14 Btobe2 −
(74AL11). See also (89PO1K; theor.).
2. 14 C(π − , γ) 14 B Q m = 118.92
A single strong transition is observed in this pion capture cross section to a state in 14 Bat
E x =2.15 ± 0.17 MeV, Γ = 1.0 ± 0.5 MeV,withJ π =2 − . The relative branching ratio of the
ground state [2 − ] to this second 2 − state is < 0.1. The data are also suggestive of the population
of 2 − and 1 − states in the E x =5− 7 MeV region (83BA36).
3. 14 C(n, p) 14 B Q m = −19.86
Ground-state angular distributions have been reported at E n =65MeV(86FOZX, 88DRZZ;
prelim.).
4. 14 C( 7 Li, 7 Be) 14 B Q m = −21.51
14 B states with 0