High-precision mass measurements of the ground and isomeric states in 124,125Ag
Abstract
The masses of the ground and isomeric states in 124,125Ag have been measured using the phase-imaging ion-cyclotron-resonance technique at the JYFLTRAP double Penning trap mass spectrometer. The ground states of 124Ag and 125Ag were found to be 30(250) keV and 250(430) keV less bound but 36 and 110 times more precise than in the Atomic Mass Evaluation 2020, respectively. The excitation energy of 124Agm, Ex = 188.2(25) keV, was determined for the first time. The new precise mass values have been utilised to study the evolution of nuclear structure via two-neutron separation energies. The impact on the astrophysical rapid neutron capture process has been investigated via neutron-capture reaction rate calculations. The precision measurements indicate a more linear trend in two-neutron separation energies and reduce the mass-related uncertainties for the neutron-capture rate of 124Ag(n,γ)125Ag by a factor of around 100. The new mass values also improve the mass of 123Pd, previously measured using 124Ag as a reference.
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