Isochronous mass measurements of neutron-deficient nuclei from 112Sn projectile fragmentation
Isochronous mass measurements of neutron-deficient nuclei from 112Sn projectile fragmentation
复制标题
112Sn 弹丸碎裂中的缺中子核的等时质量测量
DOI：
10.1103/physrevc.107.014304
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发表时间：
2023
影响因子：
3.1
通讯作者：
T. Yamaguchi
中科院分区：
文献类型：
--
作者：
Y. M. Xing;C. X. Yuan;M. Wang;Y. H. Zhang;X. H. Zhou;Yu. A. Litvinov;K. Blaum;H. S. Xu;T. Bao;R. J. Chen;C. Y. Fu;B. S. Gao;W. W. Ge;J. J. He;W. J. Huang;T. Liao;J. G. Li;H. F. Li;S. Litvinov;S. Naimi;P. Shuai;M. Z. Sun;Q. Wang;X. Xu;F. R. Xu;T. Yamaguchi
用等时质谱仪对兰州冷库内的弹丸碎片质量进行了测量。与以往的数据分析方法不同，我们根据存储碎片的算术平均旋转次数，引入指数修正的高斯函数来描述不对称的峰形。这种新的方法使我们能够适当地去卷积存储离子的重叠峰，并准确地确定它们的质量。首次直接测量了和的质量超额和低裂解异构体，并以与Penning-Trap质谱仪相当的高精度重新测定了和的质量。在新质量值的基础上，利用文献中的质子和原子能量间接得到了以前未知的、和的质量。包括张量力在内的最先进的壳层模型计算很好地再现了异构体激发能的系统趋势。
Masses ofprojectile fragments were measured employing isochronous mass spectrometry at the Cooler Storage Ring in Lanzhou. Different from the previous data analysis method, relying on the arithmetic mean revolution times of the stored fragments, we introduce an exponentially modified Gaussian function to describe the asymmetric peak shapes. This new approach enables us to properly deconvolute the overlapping peaks of stored ions and to accurately determine their masses. The mass excesses ofand the low-lyingisomers in, andwere directly measured for the first time, and the masses of, andwere redetermined with higher precision comparable to that of Penning-trap mass spectrometry. Based on the new mass value of, the previously unknown masses of, andwere obtained indirectly by using the literature proton and/ordecay energies. Systematic trends of the excitation energies of theisomers in theisotones are well reproduced by the state-of-the-art shell model calculations with the tensor forces included.