High-precision mass measurement of neutron-rich 96Kr
Résumé
While the nuclear deformation in the region around Z = 40 and N = 60 has been studied in great detail, the possible onset of nuclear deformation in the isotopic chain of krypton (Z = 36) is still a subject of controversy. Here, we present a high-precision mass measurement of the neutron-rich nuclide $^{96}$Kr, as measured by the Multiple-Reflection Time-of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF’s Ion Trap for Atomic and Nuclear Science (TITAN). A statistical method, based on a hyper-exponentially modified Gaussian, has been employed to model the data. As such, the uncertainty introduced by overlapping peaks from beam contaminants was reduced and the mass excess of $^{96}$Kr determined to be -53097(57)keV. The capability of the method has been confirmed with measurements of the stable isotopic pair $^{40}$Ar/$^{40}$Ca, in which a relative accuracy Δm/m of 3.5 ⋅ 10$^{− 8}$ and a mass resolving power of more than 400000 were achieved.
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