Reassessment of the 100Nb rotational band and its newfound connection with the (8−) isomer
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...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2025-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2025/14/epjconf_cgs17_01009.pdf |
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| Summary: | 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. |
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| ISSN: | 2100-014X |