Abstract
The Penning trap mass spectrometer JYFLTRAP, coupled to the Ion Guide Isotope Separator On-Line (IGISOL) facility at Jyvaskyla, was employed to measure the atomic masses of neutron-rich 70-73Ni and 73, 75Cu isotopes with a typical accuracy less than 5keV. The mass of 73Ni was measured for the first time. Comparisons with the previous data are discussed. Two-neutron separation energies show a weak subshell closure at 68 28Ni40 . A well established proton shell gap is observed at Z = 28 .
Highlights
Recent mass measurements on radioactive nuclei have focused on understanding the evolution of nuclear structure towards more neutron-rich nuclei
In this work we present precision mass data of the neutron-rich nickel and copper isotopes obtained at JYFLTRAP to probe the issues raised above
The production rates of the studied nuclei varied from 20 ions/s to a few ions/s for the most exotic isotopes measured at a position before they enter to the radiofrequency quadrupole (RFQ) cooler and buncher
Summary
Recent mass measurements on radioactive nuclei have focused on understanding the evolution of nuclear structure towards more neutron-rich nuclei These measurements have been partly motivated by nuclear astrophysics as the rapid neutron capture process flows along the neutron-rich nuclides [1]. In addition these nuclei can be used to study nuclear-structure phenomena, such as shell-quenching, subshell closures and the evolution of the shell closures when moving towards very neutron-rich nuclei. At N = 40, the subshell closure in 68Ni originates from a relatively large spacing between the 2p1/2 and 1g9/2 neutron orbitals, but this stability effect disappears already at 70Zn and 66Fe which have quite low 2+ excitation energies [5]
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