N=16 magicity revealed at the proton drip-line through the study of 35Ca
Abstract
The last proton bound calcium isotope Ca has been studied for the first time, using the Ca()Ca two neutron transfer reaction. The radioactive Ca nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce tritons that were detected in the MUST2 detector array, in coincidence with the heavy residues Ca or Ar. The atomic mass of Ca and the energy of its first 3/2 state are reported. A large gap of 4.61(11) MeV is deduced from the mass measurement, which together with other measured properties, makes Ca a doubly-magic nucleus. The shell gaps in Ca and O are of similar amplitude, at both edges of the valley of stability. This feature is discussed in terms of nuclear forces involved, within state-of-the-art shell model calculations. Even though the global agreement with data is quite convincing, the calculations underestimate the size of the gap in 36Ca by 840(110) keV.
Cite
@article{arxiv.2302.14382,
title = {N=16 magicity revealed at the proton drip-line through the study of 35Ca},
author = {L. Lalanne and O. Sorlin and A. Poves and M. Assié and F. Hammache and S. Koyama and D. Suzuki and F. Flavigny and V. Girard-Alcindor and A. Lemasson and A. Matta and T. Roger and D. Beaumel and Y Blumenfeld and B. A. Brown and F. De Oliveira Santos and F. Delaunay and N. de Séréville and S. Franchoo and J. Gibelin and J. Guillot and O. Kamalou and N. Kitamura and V. Lapoux and B. Mauss and P. Morfouace and J. Pancin and T. Y. Saito and C. Stodel and J-C. Thomas},
journal= {arXiv preprint arXiv:2302.14382},
year = {2023}
}