Strength observed in Gamow-Teller resonance plus continuum in the 27 Al( p ? , n ? ) reaction at 295
Strength observed in Gamow-Teller resonance plus continuum in the 27 Al( p ? , n ? ) reaction at 295
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在 295 时 27 Al( p ? , n ? ) 反应中伽莫夫泰勒共振加上连续谱中观察到的强度
DOI：
10.1016/s0370-2693(98)00320-7
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
K. Hatanaka
中科院分区：
文献类型：
--
作者：
T. Wakasa;H. Sakai;H. Okamura;H. Otsu;S. Fujita;S. Ishida;N. Sakamoto;T. Uesaka;Y. Satou;M. Greenfield;K. Hatanaka
在295 MeV的轰击能量下，测量了27al （p→，n→）反应θ - lab在0.0°~ 14.7°之间的双微分截面和极化传递系数DNN（0°）。采用多极分解技术对截面数据提取L = 0、1、2和3贡献。将由L = 0贡献推导出的Gamow-Teller （GT）强度B（GT）与全sd壳模型空间中计算的B（GT）值进行了比较。20 MeV激发下的B（GT）值之和为Sβ−= 4.0±0.1±0.1。在高达50 MeV的连续区观察到相当大的L = 0贡献，这可能部分归因于淬火GT强度。估计了Δ(1232)-等压线核子-空穴混合物对GT强度影响的极限。
The double differential cross sections for θlabbetween 0.0° and 14.7° and the polarization transfer coefficient DNN(0°) for the27Al ( p → , n → ) reaction have been measured at a bombarding energy of 295 MeV. A multipole decomposition technique is applied for the cross section data to extract L = 0, 1, 2, and 3 contributions. The Gamow-Teller (GT) strength B(GT) deduced from the L = 0 contribution is compared with the B(GT) values calculated in a full sd shell-model space. The sum of B(GT) values up to 20 MeV excitation is Sβ−= 4.0 ± 0.1 ± 0.1. A fairly large L = 0 contribution is observed in the continuum region up to 50 MeV, which could be in part ascribed to the quenched GT strength. A limit on the effect that the Δ(1232)-isobar nucleon-hole admixture has upon the GT strength is estimated.