Magic Nature of Neutrons in Ca54: First Mass Measurements of Ca5557

S. Michimasa et al.
Phys. Rev. Lett. 121, 022506 – Published 11 July 2018

Abstract

We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of Ca5557 are determined for the first time to be 18650(160), 13510(250), and 7370(990)keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p1/2 and 1f5/2 orbitals in Ca54, comparable to the gap between the neutron 2p3/2 and 2p1/2 orbitals in Ca52. For the Ca56 nucleus, an open-shell property in neutrons is suggested.

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  • Received 5 January 2018
  • Revised 21 April 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.022506

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 121, Iss. 2 — 13 July 2018

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