Dynamical core deformation effects on single-nucleon knockout reactions at fragmentation beam energies.
Dynamical core deformation effects on single-nucleon knockout reactions at fragmentation beam energies.
复制标题
动态核心变形对碎片束能量下单核子敲除反应的影响。
DOI：
10.1103/physrevc.71.064608
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发表时间：
2005
影响因子：
3.1
通讯作者：
J. Tostevin
中科院分区：
文献类型：
--
作者：
P. Batham;I. Thompson;J. Tostevin
本文研究了轻球核上堆芯形变、动力学重取向和转动激发对包容性单中子敲除反应截面的影响。在弱耦合、四极形变核加中子两体模型的框架内模拟了射弹核。我们制定列入这个非旁观者核心的自由度内的非微扰程函模型和计算的衍射打破和剥离中子去除截面。我们采用的方法来模拟单中子去除反应引起的11 Be和17 C和二次碎裂束入射到一个9Be目标。我们的计算表明，动态变形的影响上的衍射破碎组件的淘汰横截面可以是显着的。对于这里研究的两个反应，衍射破碎截面显着增强。这种效应被发现是非常表面局部化，因此核心变形的重要性增加更紧密地绑定的弹丸系统。核的四极形变参数和激发能量也影响衍射截面的增强，这是相对不敏感的弹丸能量的大小。剥离横截面被发现是几乎不变的变形芯自由度的列入。
The effects of core deformation and of its dynamical reorientation and rotational excitation on the inclusive single-neutron knockout reaction cross sections on light spherical nuclei are examined. The projectile nuclei are modeled within the framework of a weak-coupling, quadrupole-deformed core-plus-neutron two-body model. We formulate the inclusion of this non-spectator-core degree of freedom within the nonperturbative eikonal model and calculate the diffractive break up and stripping neutron-removal cross sections. We apply the methods to model the single-neutron removal reactions induced by 11Be and 17C and secondary fragmentation beams incident on a 9Be target. Our calculations indicate that dynamical deformation effects on the diffractive break up component of the knockout cross section can be significant. For the two reactions studied here, the diffractive break up cross section is significantly enhanced. This effect is found to be very surface localised, thus the importance of core deformation is increased the more tightly bound the projectile system. The quadrupole deformation parameter and excitation energy of the core also influence the magnitude of this enhancement of the diffractive cross section, which is relatively insensitive to the projectile energy. The stripping cross section is found to be virtually unchanged by the inclusion of the deformed core degree of freedom.