Magnetic dipole strength in Xe 128 and Xe 134 in the spin-flip resonance region
Magnetic dipole strength in Xe 128 and Xe 134 in the spin-flip resonance region
复制标题
自旋翻转共振区 Xe 128 和 Xe 134 的磁偶极子强度
DOI：
10.1103/physrevc.90.054310
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发表时间：
2014
影响因子：
3.1
通讯作者：
W. Tornow
中科院分区：
文献类型：
--
作者：
R. Massarczyk;G. Rusev;R. Schwengner;F. Dönau;C. Bhatia;M.E. Gooden;J.H. Kelley;A.P. Tonchev;W. Tornow
在美国北卡罗来纳州达勒姆的高强度射线源设施中，使用准单能和线性极化射线束研究了自旋翻转共振能区的磁偶极强度。吸收截面推导出的磁，电和偶极子强度分布分别为各种间隔的激发能，包括未解决的准连续体中的状态的强度。磁偶极强度分布显示类似于在自旋翻转区域中的共振的结构，在8 MeV的激发能量周围。从目前的实验中获得的电偶极子强度分布是一致的，从早期的实验中推导出的宽带韧致辐射，而不是一个准单能束。实验的磁和电偶极子强度分布进行比较与唯象近似和预测的准粒子随机相位近似在变形的基础上。
The magnetic dipole strength in the energy region of the spin-flip resonance is investigated inandusing quasimonoenergetic and linearly polarized-ray beams at the High-Intensity-Ray Source facility in Durham, North Carolina, USA. Absorption cross sections were deduced for the magnetic and electric and dipole strength distributions separately for various intervals of excitation energy, including the strength of states in the unresolved quasicontinuum. The magnetic dipole strength distributions show structures resembling a resonance in the spin-flip region around an excitation energy of 8 MeV. The electric dipole strength distributions obtained from the present experiments are in agreement with the ones deduced from an earlier experiment using broad-band bremsstrahlung instead of a quasimonoenergetic beam. The experimental magnetic and electric dipole strength distributions are compared with phenomenological approximations and with predictions of a quasiparticle random phase approximation in a deformed basis.