Details

Autor(en) / Beteiligte

• Mougeot, M.
• Atanasov, D.
• Karthein, J.
• Wolf, R. N.
• Ascher, P.
• Blaum, K.
• Chrysalidis, K.
• Hagen, G.
• Holt, J. D.
• Huang, W. J.
• Jansen, G. R.
• Kulikov, I.
• Litvinov, Yu. A.
• Lunney, D.
• Manea, V.
• Miyagi, T.
• Papenbrock, T.
• Schweikhard, L.
• Schwenk, A.
• Steinsberger, T.
• Stroberg, S. R.
• Sun, Z. H.
• Welker, A.
• Wienholtz, F.
• Wilkins, S. G.
• Zuber, K.

Titel

Mass measurements of 99–101In challenge ab initio nuclear theory of the nuclide 100Sn

Ist Teil von

• Nature physics, 2021-09, Vol.17 (10), p.1099-1103

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2021

Quelle

Springer Nature - Connect here FIRST to enable access

Beschreibungen/Notizen

• Abstract The tin isotope 100 Sn is of singular interest for nuclear structure due to its closed-shell proton and neutron configurations. It is also the heaviest nucleus comprising protons and neutrons in equal numbers—a feature that enhances the contribution of the short-range proton–neutron pairing interaction and strongly influences its decay via the weak interaction. Decay studies in the region of 100 Sn have attempted to prove its doubly magic character 1 but few have studied it from an ab initio theoretical perspective 2,3 , and none of these has addressed the odd-proton neighbours, which are inherently more difficult to describe but crucial for a complete test of nuclear forces. Here we present direct mass measurements of the exotic odd-proton nuclide 100 In, the beta-decay daughter of 100 Sn, and of 99 In, with one proton less than 100 Sn. We use advanced mass spectrometry techniques to measure 99 In, which is 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 compared with ab initio many-body calculations. The 100-fold improvement in precision of the 100 In mass value highlights a discrepancy in the atomic-mass values of 100 Sn deduced from recent beta-decay results 4,5 .