Lifetime measurements in neutron-rich odd-A yttrium isotopes (93−99Y): Investigation of shape coexistence and the intertwined quantum phase transition
Abstract
Lifetimes of 16 excited states in the neutron-rich odd-A nuclei 93−99Y were measured using fast-timing γ-γ coincidence spectroscopy with fast scintillation detectors at the LOHENGRIN recoil separator. Particular attention is given to the region around N ≈ 59, where rapid changes in nuclear deformation and shape coexistence occur. The lifetimes, determined using the generalized centroid difference method, are compared with interacting boson-fermion model calculations with configuration mixing, in which the odd-A yttrium isotopes are described as a proton coupled to a bosonic core containing normal and intruder configurations. The results provide new constraints on theoretical descriptions of shape coexistence and structural evolution in neutron-rich nuclei near A ≈ 100, particularly for odd-A systems where experimental information remains limited.
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BibTeX
@misc{pfeil2026lifetime,
title = {{Lifetime measurements in neutron-rich odd-A yttrium isotopes ($^93-99$Y): Investigation of shape coexistence and the intertwined quantum phase transition}},
author = {A. Pfeil and N. Gavrielov and U. Köster and Y. H. Kim and N. Cieplicka-Oryńczak and J. Dudouet and A. Esmaylzadeh and Ł. W. Iskra and M. Ley and J. -M. Régis and D. Reygadas and J. Jolie},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.28259},
eprint = {2608.28259},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.28259},
}
RIS
TY - UNPB
TI - Lifetime measurements in neutron-rich odd-A yttrium isotopes (^93−99Y): Investigation of shape coexistence and the intertwined quantum phase transition
AU - A. Pfeil
AU - N. Gavrielov
AU - U. Köster
AU - Y. H. Kim
AU - N. Cieplicka-Oryńczak
AU - J. Dudouet
AU - A. Esmaylzadeh
AU - Ł. W. Iskra
AU - M. Ley
AU - J. -M. Régis
AU - D. Reygadas
AU - J. Jolie
PY - 2026
DA - 2026/08/28
PB - arXiv
DO - 10.48550/arxiv.2608.28259
UR - https://arxiv.org/abs/2608.28259
AB - Lifetimes of 16 excited states in the neutron-rich odd-A nuclei ^93−99Y were measured using fast-timing γ-γ coincidence spectroscopy with fast scintillation detectors at the LOHENGRIN recoil separator. Particular attention is given to the region around N ≈ 59, where rapid changes in nuclear deformation and shape coexistence occur. The lifetimes, determined using the generalized centroid difference method, are compared with interacting boson-fermion model calculations with configuration mixing, in which the odd-A yttrium isotopes are described as a proton coupled to a bosonic core containing normal and intruder configurations. The results provide new constraints on theoretical descriptions of shape coexistence and structural evolution in neutron-rich nuclei near A ≈ 100, particularly for odd-A systems where experimental information remains limited.
ER -