Author:
Li Hong-Fu,Xu Xing,Wang Meng,Zhang Yu-Hu,Fu Chao-Yi,Huang Wen-Jia
Abstract
Abstract
Using the ground-state mass of 52Ni and two-proton decay energy of 54Zn, the ground-state mass excess of 54Zn 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
,
isospin multiplet yields a surprisingly large d coefficient of IMME, i.e.,
, being
deviated from zero, and the resultant
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
isobaric analog state (IAS) in the
nucleus 54Fe or extremely strong isospin mixing.
Funder
National Key R\&D Program of China
National Natural Science Foundation of China
Subject
Astronomy and Astrophysics,Instrumentation,Nuclear and High Energy Physics