Determination of hexadecapole (β4) deformation of the light-mass nucleus 24Mg using quasi-elastic scattering measurements

Determination of hexadecapole (β4) deformation of the light-mass nucleus 24Mg using quasi-elastic scattering measurements
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使用准弹性散射测量测定轻质量核 24Mg 的十六极 (β4) 变形

DOI:
10.1016/j.physletb.2020.135473
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发表时间:
2020
期刊:
影响因子:
4.4
通讯作者:
Smith, M.
Smith, M.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gupta, Y.K.;Nayak, B.K.;Garg, U.;Hagino, K.;Howard, K.B.;Sensharma, N.;Şenyiğit, M.;Tan, W.P.;O'Malley, P.D.;Smith, M.

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准弹性散射测量已进行使用16 O和24 Mg弹丸关闭90锆在库仑势垒附近的能量。实验数据进行了分析的框架内的耦合通道(CC)计算使用代码CCFULL。用文献中报道的90 Zr的振动耦合强度进行的CC计算,很好地再现了16 O+ 90 Zr反应的准弹性散射激发函数和势垒分布.利用这些振动耦合强度,对24 Mg+ 90 Zr反应进行了贝叶斯分析. 24 Mg的β 2和β 4值分别为+ 0.43±0.02和-0.11±0.02。本文所确定的β 2参数与非弹性散射探针的结果符合得很好。首次精确测量了24 Mg的十六极形变。目前的结果表明,准弹性散射可以提供一个有用的探针来确定原子核的基态形变。
Quasi-elastic scattering measurements have been performed using 16 O and 24 Mg projectiles off 90 Zr at energies around the Coulomb barrier. Experimental data have been analyzed in the framework of coupled channels (CC) calculations using the code CCFULL. The quasi-elastic scattering excitation function and derived barrier distribution for 16 O+ 90 Zr reaction are well reproduced by the CC calculations using the vibrational coupling strengths for 90 Zr reported in the literature. Using these vibrational coupling strengths, a Bayesian analysis is carried out for 24 Mg+ 90 Zr reaction. The β 2 and β 4 values for 24 Mg are determined to be+ 0.43±0.02 and− 0.11±0.02, respectively. The β 2 parameter determined in the present work is in good agreement with results obtained using inelastic scattering probes. The hexadecapole deformation of 24 Mg has been measured very precisely for the first time. Present results establish that quasi-elastic scattering could provide a useful probe to determine the ground state deformation of atomic nuclei.
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