| Issue |
EPJ Web Conf.
Volume 329, 2025
17th International Symposium on Capture Gamma Ray Spectroscopy and Related Topics (CGS17)
|
|
|---|---|---|
| Article Number | 01009 | |
| Number of page(s) | 5 | |
| Section | Experimental Nuclear Structure | |
| DOI | https://doi.org/10.1051/epjconf/202532901009 | |
| Published online | 25 June 2025 | |
https://doi.org/10.1051/epjconf/202532901009
Reassessment of the 100Nb rotational band and its newfound connection with the (8−) isomer
1 Université de Lyon 1, CNRS/IN2P3, UMR5822, IP2I, F-69622 Villeurbanne Cedex, France
2 Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
3 GANIL, CEA/DRF-CNRS/IN2P3, BP 55027, 14076 Caen cedex 5, France
4 Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India
5 Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai - 400094, India
* e-mail: m.abushawish@ip2i.in2p3.fr
Published online: 25 June 2025
In this work, a new spectroscopy is reported for the the odd-odd 100Nb nucleus which lies one neutron below the well known N=60 island of deformation in the A~100 mass region where a sudden shape transition from semi-spherical to well deformed ground state occurs. The measurement involved prompt and prompt-delayed γ-ray spectroscopy of fission fragments isotopically identified using the combination of the Variable Mode Spectrometer (VAMOS++), the Advanced Gamma Tracking Array (AGATA) and the EXOtic GAMma-ray spectrometer (EXOGAM). In addition, a dataset of the spontaneous fission of 252Cf measured using Gammasphere was used. A new link between the rotational band previously believed to be the ground state band and the isomer of 12.4(3) μs isomer was found, resulting in a revision of the level scheme. The new level scheme suggests that the rotational band is built on the long-lived 5+ isomer instead. Moreover, a new rotational band was identified above the predicted 10− isomer. These results are in agreement with IBFFM calculations predicting a non deformed ground state in this nucleus.
© The Authors, published by EDP Sciences, 2025
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