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Exploring the Onset of Collectivity Approaching N=40 through Manganese Masses

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arxiv 2502.18610 v1 pith:QNMJT5Q6 submitted 2025-02-25 nucl-ex

Exploring the Onset of Collectivity Approaching N=40 through Manganese Masses

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keywords mathrmapproachingcalculationscollectivitymassmassesonsetbeen
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Isotopes in the region of the nuclear chart below $^{68}\mathrm{Ni}$ 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 $^{64-68}\textrm{Mn}$ using TITAN's multiple-reflection time-of-flight mass spectrometer, resulting in the first precision mass measurements of $^{67}\mathrm{Mn}$ and $^{68}\mathrm{Mn}$. These results are compared to \textit{ab initio} calculations and modern shell model calculations and show an increase in collectivity approaching $N=40$.

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