PIONIC DECAY MODES OF LIGHT $lambda$ HYPERNUCLEI
PIONIC DECAY MODES OF LIGHT $lambda$ HYPERNUCLEI
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光 $lambda$ 超核的离子衰变模式
DOI：
10.1103/physrev.116.1312
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发表时间：
1959
期刊：
影响因子：
--
通讯作者：
L. Liu
中科院分区：
文献类型：
--
作者：
R. Dalitz;L. Liu
计算了Λ超核A<~ 5的介子衰变模的衰变几率。在以前的计算中，两体π−和π 0模的泡利原理的影响被忽略了。通过与基于两个特定系统的衰变过程的详细模型的计算进行比较，检查了基于完整性关系的所有π−（或π 0）模式的总衰变概率的估计。因此，目前关于H 4 Λ衰变的数据与以下两种情况是一致的：（a）对于任何ps小于1.5的值，自旋J= 0;或（B）对于任何ps大于1.2的值，自旋J= 1，这是一个比以前得到的弱得多的结论。在这两种情况下，如果Δ T= 1 2规则对于Λ衰变是大致正确的，那么两体模π 0+ α将在He 4 Λ衰变模中占主导地位。与He 5 Λ和H 3 Λ衰变的π 0 π−比相比，He 4 Λ衰变的π 0 π−比大（π 1.5），而H 4 Λ衰变的π 0 π −比小（π 1 6）。
Decay probabilities are calculated for pionic modes of decay of the Λ hypernuclei A<~ 5. An effect of the Pauli principle omitted in previous calculations for the two-body π− and π 0 modes is now included. An estimate for the total decay probability of all π−(or π 0) modes based on the completeness relation is checked by comparison with calculations based on detailed models of the decay process for two particular systems. As a result, the present data on H 4 Λ decay are now consistent with either (a) spin J= 0 for any value p s less than 1.5, or (b) spin J= 1 for any value p s greater than 1.2, a much weaker conclusion than that reached previously. In either case, if the Δ T= 1 2 rule is roughly correct for Λ decay, the two-body mode π 0+ α will be prominent among He 4 Λ decay modes. The π 0 π− ratio will then be large (∼ 1.5) for He 4 Λ decay and small (∼ 1 6) for H 4 Λ decay, compared with the value∼ ½ for He 5 Λ and H 3 Λ decay.