Siciliano, M., Zanon, I, Goasduff, A., John, P. R., Rodriguez, T. R., Peru, S., Deloncle, I, Libert, J., Zielinska, M., Ashad, D., Bazzacco, D., Benzoni, G., Birkenbach, B., Boso, A., Braunroth, T., Cicerchia, M., Cieplicka-Orynczak, N., Colucci, G., Davide, F., de Angelis, G., de Canditiis, B., Gadea, A., Gaffney, L. P., Galtarossa, F., Gozzelino, A., Hadynska-Klek, K., Jaworski, G., Koseoglou, P., Lenzi, S. M., Melon, B., Menegazzo, R., Mengoni, D., Nannini, A., Napoli, D. R., Pakarinen, J., Quero, D., Rath, P., Recchia, F., Rocchini, M., Testov, D., Valiente-Dobon, J. J., Vogt, A., Wiederhold, J. and Witt, W. (2020). Shape coexistence in neutron-deficient Hg-188 investigated via lifetime measurements. Phys. Rev. C, 102 (1). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

Background: Shape coexistence in the Z approximate to 82 region has been established in mercury, lead, and polonium isotopes. For even-even mercury isotopes with 100 <= N <= 106 multiple fingerprints of this phenomenon are observed, which seems to be no longer present for N >= 110. According to a number of theoretical calculations, shape coexistence is predicted in the Hg-188 isotope. Purpose: The aim of this work was to measure lifetimes of excited states in Hg-188 to infer their collective properties, such as the deformation. Extending the investigation to higher-spin states, which are expected to be less affected by band-mixing effects, can provide additional information on the coexisting structures. Methods: The Hg-188 nucleus was populated using two different fusion-evaporation reactions with two targets, Gd-158 and Gd-160, and a beam of S-34 provided by the Tandem-ALPI accelerator complex at the Laboratori Nazionali di Legnaro. The channels of interest were selected using the information from the Neutron Wall array, while the gamma rays were detected using the GALILEO gamma-ray spectrometer. Lifetimes of excited states were determined using the recoil-distance Doppler-shift method, employing the dedicated GALILEO plunger device. Results: Lifetimes of the states up to spin 16 (h) over bar were measured and the corresponding reduced transition probabilities were calculated. Assuming two-band mixing and adopting, as done commonly, the rotational model, the mixing strengths and the deformation parameters of the unperturbed structures were obtained from the experimental results. In order to shed light on the nature of the observed configurations in the Hg-188 nucleus, the extracted transition strengths were compared with those resulting from state-of-the-art beyond-mean-field calculations using the symmetry-conserving configuration-mixing approach, limited to axial shapes, and the five-dimensional collective Hamiltonian, including the triaxial degree of freedom. Conclusions: The first lifetime measurement for states with spin >= 6 suggested the presence of an almost spherical structure above the 12(1)(+) isomer and allowed elucidating the structure of the intruder band. The comparison of the extracted B(E2) strengths with the two-band mixing model allowed the determination of the ground-state band deformation. Both beyond-mean-field calculations predict coexistence of a weakly deformed band with a strongly prolate-deformed one, characterized by elongation parameters similar to those obtained experimentally, but the calculated relative position of the bands and their mixing strongly differ.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Siciliano, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zanon, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goasduff, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
John, P. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rodriguez, T. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peru, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deloncle, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Libert, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zielinska, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ashad, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bazzacco, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benzoni, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Birkenbach, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boso, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braunroth, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cicerchia, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cieplicka-Orynczak, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Colucci, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Davide, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Angelis, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Canditiis, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gadea, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gaffney, L. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Galtarossa, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gozzelino, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hadynska-Klek, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jaworski, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Koseoglou, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lenzi, S. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Melon, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menegazzo, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mengoni, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nannini, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Napoli, D. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pakarinen, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Quero, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rath, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Recchia, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rocchini, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Testov, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Valiente-Dobon, J. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vogt, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wiederhold, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Witt, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-325897
DOI: 10.1103/PhysRevC.102.014318
Journal or Publication Title: Phys. Rev. C
Volume: 102
Number: 1
Date: 2020
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
HIGH-SPIN STATES; BANDS; DECAY; TRANSITION; TESTS; OSMultiple languages
Physics, NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/32589

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