TrappedIons.org

A. Saastamoinen

Mass Measurements and Implications for the Energy of the High-Spin Isomer in 94Ag

A. Kankainen [1], V. -V. Elomaa [1], L. Batist [2], S. Eliseev [2,3], T. Eronen [1], U. Hager [1], J. Hakala [1], A. Jokinen [1,2,3], I. D. Moore, Yu. N. Novikov, H. Penttilä, A. Popov [2], S. Rahaman [1], S. Rinta-Antila [1], J. Rissanen [1], A. Saastamoinen [1,2], D. M. Seliverstov, T. Sonoda [1], G. Vorobjev [2,3], C. Weber [1], J. Äystö

Abstract

Nuclides in the vicinity of 94Ag have been studied with the Penning trap mass spectrometer JYFLTRAP at the Ion-Guide Separator On-Line. The masses of the two-proton-decay daughter 92Rh and the beta-decay daughter 94Pd of the high-spin isomer in 94Ag have been measured, and the masses of 93Pd and 94Ag have been deduced. When combined with the data from the one-proton or two-proton-decay experiments, the results lead to contradictory mass excess values for the high-spin isomer in 94Ag, -46370(170) or -44970(100) keV, corresponding to excitation energies of 6960(400) or 8360(370) keV, respectively.

Precise atomic masses of neutron-rich Br and Rb nuclei close to the r-process path

S. Rahaman, U. Hager, V. -V. Elomaa, T. Eronen, J. Hakala, A. Jokinen, A. Kankainen, P. Karvonen, I. D. Moore, H. Penttila, S. Rinta-Antila [1], J. Rissanen [1], A. Saastamoinen [1], T. Sonoda [1], J. Aysto

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 85 to 92Br and 94 to 97Rb isotopes with a typical accuracy less than 10 keV. Discrepancies with the older data are discussed. Comparison to different mass models is presented. Details of nuclear structure, shell and subshell closures are investigated by studying the two-neutron separation energy and the shell gap energy.