Missing monopole strength of the Hoyle state in the alpha inelastic scattering
Missing monopole strength of the Hoyle state in the alpha inelastic scattering
复制标题
α 非弹性散射中霍伊尔态缺失的单极子强度
DOI：
10.1088/1742-6596/569/1/012014
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
and J. Zenihiro
中科院分区：
文献类型：
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作者：
T. Kawabata;T. Kadoya;N. Yokota;S. Adachi;T. Baba;T. Furuno;H. Fujimura;M. Fujiwara;K. Hatanaka; Y. Ishii;M. Itoh;T. Ito;Y. Maeda;Y. Matsuda;M. Murata;T. Sato;A. Tamii;M. Tsumura;H. Watanabe;and J. Zenihiro
测量了激发12 C，16 O，24 Mg，28 Si和40 Ca低激发态的α非弹性散射截面，并与扭曲波玻恩近似（DWBA）计算结果进行了比较，以研究Hoyle态的激发强度缺失之谜.结果表明，采用密度依赖的aN相互作用的DWBA计算系统地高估了0+跃迁的截面，这一问题在轻核中是一个普遍存在的问题，但在Hoyle态中并不特殊.由于使用密度无关相互作用的DWBA计算相当好地再现了实验，这个难题可能与有效相互作用的密度依赖性有关。耦合通道效应的α非弹性散射也检查。耦合沟道效应减小了计算截面，部分解决了有效相互作用强度缺失的难题，但有效相互作用密度依赖性的改善仍是解决这一难题的必要条件。
Cross sections for the alpha inelastic scattering exciting the low-lying monopole states in 12 C, 16 O, 24 Mg, 28 Si, and 40 Ca were measured and compared with the distorted-wave Born-approximation (DWBA) calculation to examine the puzzle of the missing monopole strength of the Hoyle state. It was found the DWBA calculation using the density-dependent aN interaction systematically overestimates the cross sections for the 0+ transitions, and the puzzle is a universal problem in light nuclei but not special in the Hoyle state. Since the DWBA calculation using the density-independent interaction reasonably well reproduces the experiment, this puzzle might be related to the density dependence of the effective interaction. The coupled-channel effect for the alpha inelastic scattering is also examined. The coupled-channel effect reduces the calculated cross section, and solve the puzzle of the missing monopole strengths in part, but the improvement of the density dependence of the effective interaction is still necessary to solve the puzzle.