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  • Letter
  • Open Access

Direct mass measurement of Pd93 and implications for the isomer structures in Ag94: Tracing the two-proton decay branch

Gabriella Kripkó-Koncz1,2,3,*, Wolfgang R. Plaß1,4, Irene Dedes5, Duy Duc Dao6, Timo Dickel1,4, Christine Hornung1,2,4, Daler Amanbayev1,2,4, Samuel Ayet San Andrés1,4, Sönke Beck1,4 et al. (for the Super-FRS Experiment Collaboration)

Sönke Beck1,4, Julian Bergmann1, Andrey Blazhev7, Jerzy Dudek5,6,8, Hans Geissel1,4,†, Emma Haettner4, Nasser Kalantar-Nayestanaki9, Israel Mardor10,11, Ivan Miskun1, Ali Mollaebrahimi1,4,9, Xavier Mougeot12, Ivan Mukha4, Frédéric Nowacki6, Christoph Scheidenberger1,2,4, Juha Äystö13,14, Soumya Bagchi1,4,15,‡, Dimiter L. Balabanski16, Andrzej Baran8, Žiga Brenčič17, Volha Charviakova18, Paul Constantin16, Masoumeh Dehghan4, Abdelghafar Gaamouci5, Zhuang Ge4,13, Magdalena Górska4, Lizzy Gröf1, Oscar Hall3, Muhsin N. Harakeh9, Jan-Paul Hucka4,19, Anu Kankainen13,14, Ronja Knöbel4, Daria A. Kostyleva1,4, Natalia Kurkova20, Natalia Kuzminchuk4, Dragos Nichita16,21, Zygmunt Patyk18, Stephane Pietri4, Sivaji Purushothaman4, Moritz Pascal Reiter3, Mikael Reponen13,14, Heidi Roesch4,19, Anamaria Spătaru16,21, Goran Stanic22, Alexandru State16,21, Yoshiki K. Tanaka4, Matjaž Vencelj17, Helmut Weick4, Jie Yang23, Mikhail I. Yavor24, and Jianwei Zhao4 (for the Super-FRS Experiment Collaboration)

  • *Contact author: gabriella.kripko-koncz@exp2.physik.uni-giessen.de
  • †Deceased.
  • ‡Present address: Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826004, India.
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Phys. Rev. Research 7, L042022 – Published 23 October, 2025

DOI: https://doi.org/10.1103/mhhn-kmgx

Abstract

The first direct mass measurement of Pd93, the one-proton-decay daughter of the (21+) isomer in Ag94, has been performed, resulting in a mass excess value of −59127(35) keV and reducing the mass uncertainty by an order of magnitude. As a consequence, the excitation energies of the presumed parent states of the one-proton (1p) decay and two-proton (2p) decay in Ag94 are found to differ from each other by ten standard deviations. This shows that there is an incompatibility in the previously reported decay scheme of the 1p and 2p branches. Three scenarios are discussed, which could resolve this apparent contradiction, and elucidated by performing state-of-the-art shell-model and mean-field calculations. The latter confirm that, based on the reported decay information, the 2p emission cannot be fed from the same (21+) isomer as the 1p emission, but indicate that it could originate from a second, structurally different, high-spin state.

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Phys. Rev. Research 7, L042022– Published 23 October, 2025
  • Received 13 November 2024
  • Revised 22 June 2025
  • Accepted 21 August 2025
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