Orateur
Description
The nuclear binding energy arises from various effects that govern nuclear properties. Different nucleon configurations within nuclear isomers lead to modified binding energies, often resulting in mass differences of tens to hundreds of kilo-electronvolts. These isomeric excitation energies can be directly accessed by measuring the difference in atomic masses of ground and isomeric states. Here, we present such measurements performed through mult-reflection time-of-flight [1] and ion-cyclotron resonance mass spectrometry [2]. By evaluating the excitation energies of neutron-deficient indium isotopes down to the shell closure at N=50 against state-of-the-art shell model, DFT, and ab initio calculations, we contrast the performance of these theories applied to several nuclear properties [3,4]. We further present evidence for shape-coexistences close to N=50 through independent excitation energy measurements of the 1/2$^+$ state in $^{79}$Zn with JYFLTRAP at IGISOL and ISOLTRAP at ISOLDE, supported by accurate large-scale shell model calculations [5].
[1] Wienholtz, F. et al. (2013). Masses of exotic calcium isotopes pin down nuclear forces. Nature, 498(7454), 346–349. https://doi.org/10.1038/nature12226
[2] Dilling, J., Blaum, K., Brodeur, M., & Eliseev, S. (2018). Penning-Trap Mass Measurements in Atomic and Nuclear Physics. Annual Review of Nuclear and Particle Science, 68, 45–74. https://doi.org/10.1146/ANNUREV-NUCL-102711-094939
[3] Mougeot, M. et al. (2021). Mass measurements of 99–101In challenge ab initio nuclear theory of the nuclide 100Sn. Nature Physics, 17(10), 1099–1103. https://doi.org/10.1038/S41567-021-01326-9
[4] L. Nies et al., Isomeric excitation energy for 99mIn from mass spectrometry reveals contrasting trends next to doubly magic 100Sn, submitted
[5] L. Nies et al., in preparation
L. Nies, A. Kankainen, K. Blaum, D. Lunney, L. Schweikhard for the JYFLTRAP and ISOLTRAP collaborations
