Precise determination of quadrupole and hexadecapole deformation parameters of the sd-shell nucleus, 28Si

Precise determination of quadrupole and hexadecapole deformation parameters of the sd-shell nucleus, 28Si
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精确测定 sd 壳核 28Si 的四极和十六极变形参数

DOI:
10.1016/j.physletb.2023.138120
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发表时间:
2023
期刊:
影响因子:
4.4
通讯作者:
Joshi, B.N.
Joshi, B.N.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gupta, Y.K.;Katariya, V.B.;Prajapati, G.K.;Hagino, K.;Patel, D.;Ranga, V.;Garg, U.;Danu, L.S.;Pal, A.;Joshi, B.N.

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准弹性(QEL)散射测量已进行使用28硅弹丸关闭90锆靶在库仑势垒附近的能量。在28 Si四极和十六极形变(β 2和β 4)的大参数空间中,在耦合沟道(CC)计算的框架内进行了贝叶斯分析。我们的结果明确地表明28 Si是一个扁球形核,β 2=-0.38 0. 01,这与电磁探针的结果非常一致。利用QEL散射首次确定了28 Si的四极形变沿着的符号和大小,并得到了十六极形变的精确值(β 4=+ 0.03±0.01)。用Skyrme-Hartree-Fock方法计算的28 Si的β 4值与实验值吻合得很好。目前的结果表明,强的准弹性散射的符号和幅度的基态变形参数的敏感性,从而肯定其适用于稀有奇异核使用低强度RIBs。
Quasi-elastic (QEL) scattering measurements have been performed using a 28 Si projectile off a 90 Zr target at energies around the Coulomb barrier. A Bayesian analysis within the framework of coupled channels (CC) calculations is performed in a large parameter space of quadrupole and hexadecapole deformations (β 2 and β 4) of 28 Si. Our results unambiguously show that 28 Si is an oblate shaped nucleus with β 2=-0.38±0.01 which is in excellent agreement with results from electromagnetic probes. The sign and magnitude of quadrupole deformation along with a precise value of hexadecapole deformation (β 4=+ 0.03±0.01) of 28 Si have been determined for the first time using QEL scattering. A remarkable agreement is obtained between the experimental and calculated β 4 values of 28 Si based on Skyrme-Hartree-Fock method. The present results demonstrate the strong sensitivity of the quasi-elastic scattering to the sign and magnitude to the ground state deformation parameters, thus affirming its suitability to be used for rare exotic nuclei using low intensity RIBs.
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