| Title: |
Isomeric yield ratios and mass spectrometry of Y and Nb isotopes in the neutron-rich N=60 region : The unusual case of 98Y |
| Authors: |
Cannarozzo, Simone; Pomp, Stephan; Kankainen, Anu; Moore, Iain; Stryjczyk, Marek; Al-Adili, Ali; Solders, Andreas; Virtanen, Ville; Eronen, Tommi; Gao, Zhihao; Ge, Zhuang; Jaries, Arthur; Lantz, Mattias; Mougeot, Maxime; Penttilä, Heikki; Raggio, Andrea; Ruotsalainen, Jouni |
| Publisher Information: |
Uppsala universitet, Tillämpad kärnfysik; Department of Physics, Accelerator Laboratory, University of Jyvaskyla, P.O. Box 35(YFL), Jyvaskyla, 40014, Finland; Institut Laue-Langevin, 71 Avenue des Martyrs, F-38042 Grenoble, France. ;Department of Physics, Accelerator Laboratory, University of Jyvaskyla, P.O. Box 35(YFL), Jyvaskyla, 40014, Finland |
| Publication Year: |
2025 |
| Collection: |
Uppsala University: Publications (DiVA) |
| Subject Terms: |
Nuclear fission; Isomeric yield ratios; Shape coexistence; Mass spectrometry; Subatomic Physics; Subatomär fysik |
| Description: |
The isomeric yield ratio (IYR) of fission products is an observable that carries relevant information about the fragments emerging from the scission of a fissioning nucleus. We report on IYR of Y-96,Y-98,Y-100 and Nb-100,Nb-102,together with the previously reported values for Y-97 and Nb-99, produced in the 28 MeV alpha-induced fission of Th-232 at the Ion Guide Isotope Separation On-Line (IGISOL) facility of the University of Jyvaskyla. We measured the IYR using two different techniques, the phase-imaging ion-cyclotron-resonance (PI-ICR) and the multiple-reflection time-of-flight mass spectrometry (MR-TOF-MS) methods. Moreover, we measured the masses of the long-lived states in Y-98,Y-100 and Nb-100,Nb-102 populated via in-trap beta-decay of their precursors. Since the beta-decay selectively populates states with a favourable spin-parity, we could identify the measured state and show that the ground state is the low-spin state in the cases of Y-98 and Nb-100, while it is the high-spin state in the cases of Y-100 and Nb-102. This measurement confirms the spin-parity assignments of all the nuclei as they are reported in the NUBASE2020 evaluations, disagreeing with the assignment for Y-100 reported in the ENSDF evaluation. Making also use of previously reported data, we observe an anomalously low IYR for the N = 59 isotope Y-98 as compared to other yttrium or neighboring niobium isotopes. This behavior is very rare across the nuclear chart and is posited to be connected to the characteristic shape coexistence of Y-98, and to the change in the charge radii of the ground and excited states in the N = 58-60 region. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| Relation: |
Physics Letters B, 0370-2693, 2025, 871; ISI:001629150300001 |
| DOI: |
10.1016/j.physletb.2025.140012 |
| Availability: |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-554774; https://doi.org/10.1016/j.physletb.2025.140012 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.1AD2A64C |
| Database: |
BASE |