Exploring the Onset of Collectivity Approaching N=40 through Manganese Masses
Abstract
Isotopes in the region of the nuclear chart below 68Ni have been the subject of intense experimental and theoretical effort due to the potential onset of a new ``island of inversion'' when crossing the harmonic oscillator subshell closure at N = 40. We have measured the masses of 64-68Mn using TITAN's multiple-reflection time-of-flight mass spectrometer, resulting in the first precision mass measurements of 67Mn and 68Mn. These results are compared to ab initio calculations and modern shell model calculations and show an increase in collectivity approaching N=40.
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