Direct mass measurement of ^{93}Pd and implications for the isomer structures in ^{94}Ag: Tracing the two-proton decay branch

• 出版年: Physical Review Research
• 主要な著者: Gabriella Kripkó-Koncz, Wolfgang R. Plaß, Irene Dedes, Duy Duc Dao, Timo Dickel, Christine Hornung, Daler Amanbayev, Samuel Ayet San Andrés, Sönke Beck, Julian Bergmann, Andrey Blazhev, Jerzy Dudek, Hans Geissel, Emma Haettner, Nasser Kalantar-Nayestanaki, Israel Mardor, Ivan Miskun, Ali Mollaebrahimi, Xavier Mougeot, Ivan Mukha, Frédéric Nowacki, Christoph Scheidenberger, Juha Äystö, Soumya Bagchi, Dimiter L. Balabanski, Andrzej Baran, Žiga Brenčič, Volha Charviakova, Paul Constantin, Masoumeh Dehghan, Abdelghafar Gaamouci, Zhuang Ge, Magdalena Górska, Lizzy Gröf, Oscar Hall, Muhsin N. Harakeh, Jan-Paul Hucka, Anu Kankainen, Ronja Knöbel, Daria A. Kostyleva, Natalia Kurkova, Natalia Kuzminchuk, Dragos Nichita, Zygmunt Patyk, Stephane Pietri, Sivaji Purushothaman, Moritz Pascal Reiter, Mikael Reponen, Heidi Roesch, Anamaria Spătaru, Goran Stanic, Alexandru State, Yoshiki K. Tanaka, Matjaž Vencelj, Helmut Weick, Jie Yang, Mikhail I. Yavor, Jianwei Zhao
• フォーマット: 論文
• 言語: 英語
• 出版事項: American Physical Society 2025-10-01
• オンライン･アクセス: http://doi.org/10.1103/mhhn-kmgx

The first direct mass measurement of ^{93}Pd, the one-proton-decay daughter of the (21^{+}) isomer in ^{94}Ag, 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 ^{94}Ag 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.