Mass Measurements of Exotic Ar 48-50 Isotopes: Probing Proton-Neutron Interaction of the Doubly Magic Ca 52 and the Robustness of N=32 Subshell
Journal article, 2026
High-precision multireflection time-of-flight mass spectrometry has been applied at BigRIPS-SLOWRI of the Radioactive Isotope Beam Factory (RIBF). The atomic mass of Ar50 was measured for the first time, and the mass value of Ar49 was determined to be 674 keV lower than the one from a previous Bρ- TOF measurement, with a precision improved by a factor of 250. The new mass data enable us to determine the empirical proton-neutron interaction strength in the unconventional doubly magic nucleus Ca52. This strength exhibits a conspicuous variation across shell closures, analogously to what observed in classical doubly magic nuclei. Meanwhile, our measurements support the existence of a weak shell effect at N=32 in Ar isotopes. To supplement these experimental findings, theoretical calculations were performed for the isotopes of interest, which, compared with data, illustrate the capacity of ab initio expansion methods to capture key quadrupole correlations in doubly open-shell nuclei via an explicit account of nuclear deformation.
Author
C. Y. Fu
The University of Hong Kong
Chinese Academy of Sciences
W. D. Xian
The University of Hong Kong
High Energy Accelerator Research Organization
Sun Yat-Sen University
T. Niwase
Meiji University
M. Rosenbusch
RIKEN
M. Wada
Chinese Academy of Sciences
High Energy Accelerator Research Organization
Ji Hua Laboratory
Alberto Scalesi
University Paris-Saclay
Subatomic, High Energy and Plasma Physics 1
V. Somà
University Paris-Saclay
J. Lee
The University of Hong Kong
H. Ishiyama
RIKEN
S. Nishimura
RIKEN
S. Yoshida
Utsunomiya University
RIKEN
A. Takamine
RIKEN
Kyushu University
P. Schury
High Energy Accelerator Research Organization
D. S. Hou
The University of Hong Kong
S. Kimura
High Energy Accelerator Research Organization
Y. Hirayama
High Energy Accelerator Research Organization
Y. Ito
High Energy Accelerator Research Organization
S. Iimura
Rikkyo University
J. M. Yap
The University of Hong Kong
Y. X. Watanabe
High Energy Accelerator Research Organization
Q. B. Zeng
Chinese Academy of Sciences
RIKEN
V. H. Phong
RIKEN
T. T. Yeung
University of Tokyo
H. Ueno
RIKEN
H. Haba
RIKEN
T. Duguet
University Paris-Saclay
M. Frosini
The French Alternative Energies and Atomic Energy Commission (CEA)
Z. H. Li
Peking University
H. Y. Wu
China Institute of Atomic Energy
Peking University
A. Estradé
Central Michigan University
M. Khandelwal
Osaka University
Y. Jang
Korea University
J. Lee
Korea University
A. I. Morales
RIKEN
Universitat de Valencia
R. Kanungo
TRIUMF
M. Tanaka
Kyushu University
D. Suzuki
University of Tokyo
RIKEN
H. J. Ong
Chinese Academy of Sciences
H. Sakurai
RIKEN
S. Michimasa
RIKEN
N. Fukuda
RIKEN
H. Takeda
RIKEN
H. Suzuki
RIKEN
Y. Shimizu
RIKEN
M. Ohtake
RIKEN
K. Kusaka
RIKEN
Y. Yanagisawa
RIKEN
Y. Togano
RIKEN
M. Yoshimoto
RIKEN
B. Hong
Korea University
Y. H. Kim
Institute for Basic Science
X. Ma
Chinese Academy of Sciences
B. Moon
Institute for Basic Science
J. Park
Institute for Basic Science
Hope College
F. F. Zeng
Chinese Academy of Sciences
J. Z. Zhang
Peking University
Physical Review Letters
0031-9007 (ISSN) 1079-7114 (eISSN)
Vol. 137 6 062502Subject Categories (SSIF 2025)
Atom and Molecular Physics and Optics
Subatomic Physics
DOI
10.1103/krq1-t8pr