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Spherical-oblate shape coexistence in $^{94}$Zr from a model-independent analysis

Fuente: arXiv

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Bibliographic Details
Main Authors:	Marchini, N., Rocchini, M., Zielinska, M., Nannini, A., Doherty, D. T., Gavrielov, N., Garrett, P. E., Hadynska-Klek, K., Goasduff, A., Testov, D., Bakes, S. D., Bazzacco, D., Benzoni, G., Berry, T., Brugnara, D., Camera, F., Catford, W. N., Chiari, M., Galtarossa, F., Gelli, N., Gottardo, A., Gozzelino, A., Illana, A., Keatings, J., Mengoni, D., Morrison, L., Napoli, D. R., Ottanelli, M., Ottanelli, P., Pasqualato, G., Recchia, F., Riccetto, S., Scheck, M., Siciliano, M., Dobon, J. J. Valiente, Zanon, I.
Format:	Preprint
Published:	2024
Subjects:	Nuclear Experiment Nuclear Theory
Online Access:	Acceder al recurso
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_version_	1866916355744202752
author	Marchini, N. Rocchini, M. Zielinska, M. Nannini, A. Doherty, D. T. Gavrielov, N. Garrett, P. E. Hadynska-Klek, K. Goasduff, A. Testov, D. Bakes, S. D. Bazzacco, D. Benzoni, G. Berry, T. Brugnara, D. Camera, F. Catford, W. N. Chiari, M. Galtarossa, F. Gelli, N. Gottardo, A. Gozzelino, A. Illana, A. Keatings, J. Mengoni, D. Morrison, L. Napoli, D. R. Ottanelli, M. Ottanelli, P. Pasqualato, G. Recchia, F. Riccetto, S. Scheck, M. Siciliano, M. Dobon, J. J. Valiente Zanon, I.
author_facet	Marchini, N. Rocchini, M. Zielinska, M. Nannini, A. Doherty, D. T. Gavrielov, N. Garrett, P. E. Hadynska-Klek, K. Goasduff, A. Testov, D. Bakes, S. D. Bazzacco, D. Benzoni, G. Berry, T. Brugnara, D. Camera, F. Catford, W. N. Chiari, M. Galtarossa, F. Gelli, N. Gottardo, A. Gozzelino, A. Illana, A. Keatings, J. Mengoni, D. Morrison, L. Napoli, D. R. Ottanelli, M. Ottanelli, P. Pasqualato, G. Recchia, F. Riccetto, S. Scheck, M. Siciliano, M. Dobon, J. J. Valiente Zanon, I.
contents	Low-lying states of $^{94}$Zr were investigated via low-energy multi-step Coulomb excitation. From the measured $γ$-ray yields, 13 reduced transition probabilities between low-spin states were determined, together with the spectroscopic quadrupole moments of the $2_{1,2}^+$ states. Based on this information, for the first time in the Zr isotopic chain, the shapes of the $0_{1,2}^+$ states including their deformation softness were inferred in a model-independent way using the quadrupole sum rules approach. The ground state of $^{94}$Zr possesses a rather diffuse shape associated with a spherical configuration, while the $0_2^+$ state is oblate and more strongly deformed. The observed features of shape coexistence in $^{94}$Zr are in agreement with Monte-Carlo shell-model predictions, and the present results are vital to refine the IBM-CM description of the Zr isotopes around $A\approx 100$ in terms of an intertwined quantum phase transition.
format	Preprint
id	arxiv_https___arxiv_org_abs_2408_06940
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Spherical-oblate shape coexistence in $^{94}$Zr from a model-independent analysis Marchini, N. Rocchini, M. Zielinska, M. Nannini, A. Doherty, D. T. Gavrielov, N. Garrett, P. E. Hadynska-Klek, K. Goasduff, A. Testov, D. Bakes, S. D. Bazzacco, D. Benzoni, G. Berry, T. Brugnara, D. Camera, F. Catford, W. N. Chiari, M. Galtarossa, F. Gelli, N. Gottardo, A. Gozzelino, A. Illana, A. Keatings, J. Mengoni, D. Morrison, L. Napoli, D. R. Ottanelli, M. Ottanelli, P. Pasqualato, G. Recchia, F. Riccetto, S. Scheck, M. Siciliano, M. Dobon, J. J. Valiente Zanon, I. Nuclear Experiment Nuclear Theory Low-lying states of $^{94}$Zr were investigated via low-energy multi-step Coulomb excitation. From the measured $γ$-ray yields, 13 reduced transition probabilities between low-spin states were determined, together with the spectroscopic quadrupole moments of the $2_{1,2}^+$ states. Based on this information, for the first time in the Zr isotopic chain, the shapes of the $0_{1,2}^+$ states including their deformation softness were inferred in a model-independent way using the quadrupole sum rules approach. The ground state of $^{94}$Zr possesses a rather diffuse shape associated with a spherical configuration, while the $0_2^+$ state is oblate and more strongly deformed. The observed features of shape coexistence in $^{94}$Zr are in agreement with Monte-Carlo shell-model predictions, and the present results are vital to refine the IBM-CM description of the Zr isotopes around $A\approx 100$ in terms of an intertwined quantum phase transition.
title	Spherical-oblate shape coexistence in $^{94}$Zr from a model-independent analysis
topic	Nuclear Experiment Nuclear Theory
url	https://arxiv.org/abs/2408.06940