On the masses of A=54 isospin septet and the isobaric multiplet mass equation  

作　　者：Hong-Fu Li Xing Xu Meng Wang Yu-Hu Zhang Chao-Yi Fu Wen-Jia Huang 李宏福;徐星;王猛;张玉虎;付超义;黄文嘉(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Lanzhou University,Lanzhou 730000,China;School ofNuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China;School of Physics,Xi'an Jiaotong University,Xi'an 710049,China;Advanced Energy Science and Technology Guangdong Laboratory,Huizhou 516003,China)

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]Lanzhou University,Lanzhou 730000,China [3]School ofNuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Physics,Xi'an Jiaotong University,Xi'an 710049,China [5]Advanced Energy Science and Technology Guangdong Laboratory,Huizhou 516003,China

出　　处：《Chinese Physics C》2022年第6期124-128,共5页中国物理C（英文版）

基　　金：Supported in part by the National Key R&D Program of China(2018YFA0404401,2016YFA0400504);National Natural Science Foundation of China(11975280,11905259)。

摘　　要：Using the ground-state mass of ^(52)Ni and two-proton decay energy of ^(54)Zn,the ground-state mass excess of ^(54)Zn is deduced to be-6504(85)keV.This value is about 2 MeV lower than the prediction of the quadratic form of the isobaric multiplet mass equation(IMME).A cubic fit to the existing mass data of the A=54,T=3 isospin multiplet yields a surprisingly large d coefficient of IMME,i.e.,d=18.6(27),being 6.9σdeviated from zero,and the resultant|b/c|ratio significantly deviates from the systematics.This phenomenon is analyzed in this study,and we conclude that the breakdown of the quadratic form of IMME could be likely due to the mis-assignment of the T=3 isobaric analog state(IAS)in the T_(Z)=1 nucleus ^(54)Fe or extremely strong isospin mixing.

关 键 词：isobaric multiplet mass equation(IMME) MASS ^(54)Zn 

分 类 号：O469[理学—凝聚态物理]