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GENERAL: See also (85AJ01) and Table 12.1 [Table of Energy Levels] (in PDF or PS) here.

General theoretical papers: (84FR13, 85AN28, 85BA51, 85WI1B, 86WI04, 87BL18, 87GI1C, 87SA15, 87YA16, 88RU01, SU88C, 89BE03).

Hypernuclei: (84IW1B, 84YA04, 85BE31, 85GA1C, 85IK1A, 85WA1N, 85YA01, 85YA07, 86BA1W, 86BI1G, 86DO1B, 86GA1J, 86GA14, 86GA1H, 86HA26, 86MA1J, 86ME1F, 86MI1N, 86PO1H, 86YA1T, 86ZO1A, 87DA30, 86FA1A, 87HA40, 86IK1B, 87PO1H, 87WU1B, 88BA24, 88HA07, 88MA09, 88PO1H, 88TA14, 88WA1B, 88YA05).

Other topics: (89SU05).

Secondary beams of ¹²Be produced in the fragmentation of ²⁰Ne accelerated to 800 MeV/A have been used to measure interaction cross sections in Be, C and Al. The interaction radius and the r.m.s. radius for the nucleon distribution in ¹²Be have also been derived (88TA10). See also (89SA10, 89TA1K).

1. 12Be(β-)12B

Qm = 11.708

The half-life of ¹²Be is 24.4. ± 3.0 ms (78AL10), 21.3 ± 2.2 ms (86CU01), 24.0 ± 1.0 ms (84DU15): the mean of these values is 23.6 ± 0.9 ms. Log ft = 3.834 ± 0.017 (M.J. Martin, private communication), assuming the decay is to ¹²B_g.s.. The upper limit of the branching to a state which subsequently decays by neutron emission is 1% (78AL10, 84DU15).

2. 10Be(t, p)12Be

Qm = -4.809

At E_t = 12 MeV ¹²Be*(2.10) is populated [E_x = 2115 ± 15 keV] and (p, γ) angular correlations lead to J = 2 (78AL10). At E_t = 17 MeV proton groups are observed to the states shown in Table 12.1 (in PDF or PS). The energy of ¹²Be*(2.10) is measured to be 2089 ± 20 keV. The two highest states have an appreciable intrinsic width. From the measured atomic mass excess of ¹²Be, d, the cubic factor in the IMME, is calculated to be +2.8 ± 8.6 keV and the first T = 2 state in ¹²N should occur at E_x = 12.27 ± 0.04 MeV (78AL29): compare with ¹²O. See also (80AJ01).

3.14C(14C, 16O)12Be

Qm = -14.300

At E(¹⁴C) = 60 MeV ¹²Be*(0, 2.10, 2.68 ± 0.03) have been populated, the latter weakly. Angular distributions are poorly fitted by DWBA. An assignment of 0⁺ is plausible but not proven for ¹²Be*(2.70) (82BE42).