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arXiv 1008.4237nucl-th
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$^9$ Be共振态的结构和三体衰变

Structure and three-body decay of $^9$Be resonances

R. Alvarez-Rodriguez, A. S. Jensen, E. Garrido, D. V. Fedorov

摘要:

用复数旋转超球绝热方法研究了低激发态$^9$ Be共振衰变为一个中子和两个$α$粒子的过程。我们研究了六个共振以上的分裂阈值和低于6 MeV:$1/2^\pm$,$3/2^\pm$和$5/2^\pm$。研究了各共振态的短程性质,确定了$^8$ Be和$^5$ He两体亚结构的不同角动量和宇称组态.我们计算了通过$^8$ Be基态的连续衰变的分支比,定性地与测量结果一致。我们从大距离渐近结构中直接提取衰变后的动量分布到三体连续体中。运动学上完整的结果作为Dalitz图以及给定中子和$α$能量的投影。的分布进行了讨论,并在大多数情况下,发现同意与现有的实验数据。

英文摘要:

The complex-rotated hyperspherical adiabatic method is used to study the decay of low-lying $^9$Be resonances into one neutron and two $α$-particles. We investigate the six resonances above the break-up threshold and below 6 MeV: $1/2^\pm$, $3/2^\pm$ and $5/2^\pm$. The short-distance properties of each resonance are studied, and the different angular momentum and parity configurations of the $^8$Be and $^5$He two-body substructures are determined. We compute the branching ratio for sequential decay via the $^8$Be ground state which qualitatively is consistent with measurements. We extract the momentum distributions after decay directly into the three-body continuum from the large-distance asymptotic structures. The kinematically complete results are presented as Dalitz plots as well as projections on given neutron and $α$-energy. The distributions are discussed and in most cases found to agree with available experimental data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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