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Article
Report number	arXiv:2109.10673
Title	Mass measurements of $^{99-101}$In challenge ab initio nuclear theory of the nuclide $^{100}$Sn
Related title	Mass measurements of 99-101In challenge ab initio nuclear theory of the nuclide 100Sn
Author(s)	Mougeot, M. (Heidelberg, Max Planck Inst. ; CERN) ; Atanasov, D. (CERN) ; Karthein, J. (Heidelberg, Max Planck Inst. ; CERN) ; Wolf, R.N. (Sydney U.) ; Ascher, P. (CENBG, Gradignan) ; Blaum, K. (Heidelberg, Max Planck Inst.) ; Chrysalidis, K. (CERN) ; Hagen, G. (Tennessee U. ; Oak Ridge) ; Holt, J.D. (TRIUMF ; McGill U.) ; Huang, W.J. (Heidelberg, Max Planck Inst.) ; Jasen, G.R. (ORNL, Oak Ridge (main)) ; Kulikov, I. (Darmstadt, GSI) ; Litvinov, Yu.A. (Darmstadt, GSI) ; Lunney, D. (IJCLab, Orsay) ; Manea, V. (CERN ; IJCLab, Orsay) ; Miyagi, T. (TRIUMF) ; Papenbrock, T. (Tennessee U. ; Oak Ridge) ; Schweikhard, L. (Greifswald U.) ; Schwenk, A. (Heidelberg, Max Planck Inst. ; Darmstadt, Tech. U. ; Darmstadt, EMMI) ; Steinsberger, T. (Heidelberg, Max Planck Inst.) ; Stroberg, S.R. (Washington U., Seattle) ; Sun, Z.H. (Tennessee U. ; Oak Ridge) ; Welker, A. (CERN) ; Wienholtz, F. (CERN ; Greifswald U. ; Darmstadt, Tech. U.) ; Wilkins, S.G. (CERN) ; Zuber, K. (Dresden, Tech. U.)
Publication	2021
Imprint	2021-09-22
Number of pages	12
In:	Nature Phys. 17 (2021) 1099
DOI	10.1038/s41567-021-01326-9 (publication)
Subject category	Nuclear Physics - Experiment ; Nuclear Physics - Theory
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	$^{100}$Sn is of singular interest for nuclear structure. Its closed-shell proton and neutron configuration exhibit exceptional binding and $^{100}$Sn is the heaviest nucleus comprising protons and neutrons in equal number, a feature that enhances the contribution of the short-range, proton-neutron pairing interaction and strongly influences its decay via the weak interaction. Decays studies in the region of $^{100}$Sn have attempted to prove its doubly magic character but few have studied it from the ab initio theoretical perspective and none have addressed the odd-proton nuclear forces. Here we present, the first direct measurement of the exotic odd-proton nuclide $^{100}$In - the beta-decay daughter of $^{100}$Sn - and $^{99}$In, only one proton below $^{100}$Sn. The most advanced mass spectrometry techniques were used to measure $^{99}$In, produced at a rate of only a few ions per second, and to resolve the ground and isomeric states in $^{101}$In. The experimental results are confronted with new ab initio many-body approaches. The 100-fold improvement in precision of the 100In mass value exarcebates a striking discrepancy in the atomic mass values of $^{100}$Sn deduced from recent beta-decay results.
Copyright/License	publication: (License: CC BY 4.0) preprint: (License: CC BY 4.0)

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