Shape coexistence in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Hg</mml:mi><mml:mprescripts /><mml:none /><mml:mn>178</mml:mn></mml:mmultiscripts></mml:math>

Müller-Gatermann, C.; Dewald, Α.; Fransen, C.; Auranen, K.; Badran, H.; Beckers, M.; Blazhev, A.; Braunroth, T.; Cullen, D. M.; Fruet, G.; Goldkuhle, A.; Grahn, T.; Greenlees, P. T.; Herzáň, A.; Jakobsson, U.; Jolie, J.; Julin, R.; Juutinen, S.; Konki, J.; Leino, M.; Litzinger, J.; Nomura, K.; Pakarinen, J.; Peura, P.; Procter, M. G.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Scholey, C.; Sorri, J.; Stolze, Sanna; Taylor, M. J.; Uusitalo, J.; Zell, K. O.

doi:10.1103/physrevc.99.054325

Cited by 14 publications

(7 citation statements)

References 31 publications

(51 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yang et al [76] found that the degenerate minima are more related to quadrupole deformation than triaxial deformation. Many experiments have been carried out to discover shape coexistence in nuclei, for example, see [27,29,[77][78][79][80] for Hg isotopes.…”

Section: Shape Coexistencementioning

confidence: 99%

Bubble nuclei with shape coexistence in even-even isotopes of Hf to Hg

Choi,

Lee,

Mun

et al. 2022

Preprint

View full text Add to dashboard Cite

The shape of a nucleus is one of fundamental nuclear properties. We perform a systematic investigation of bubble nuclei that also exhibit shape coexistence in Hf, W, Os, Pt and Hg even-even isotopes using the deformed relativistic Hartree-Bogoliubov theory in continuum. For a systematic study, we first consider nuclear bubble structures and shape coexistence separately. We confirm that deformations and pairing correlations hinder bubble structures by comparing our results with those from relativistic continuum Hartree-Bogoliubov theory that assumes spherical symmetry in nuclei. We then predict candidate isotopes with both bubble structure and shape coexistence. We observe that the depletion fraction factor that characterizes bubble structure is mostly smaller in oblate deformation than in prolate, while some isotopes such as 206 Os have bubble structures both in oblate and prolate deformations. We compare the proton single-particle energy levels for the candidates of shape coexistence both with only prolate bubble structure and with prolate and oblate bubble structures.

show abstract

Section: Shape Coexistencementioning

confidence: 99%

Bubble nuclei with shape coexistence in even-even isotopes of Hf to Hg

Choi,

Lee,

Mun

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Further information on collective structures in neutron-deficient Hg nuclei was provided by measurements of γ-ray transition strengths. Lifetimes of excited states were measured for several neutron-deficient species, populated via fusion-evaporation reactions: the 178 Hg [21], 180,182 Hg [22,23] and 184,186 Hg [16,24,25] nuclei were studied using the Recoil-Distance Doppler-Shift (RDDS) method, while the Doppler-Shift Attenuation Method (DSAM) and the β-tagged fast-timing (FT) techniques were employed to investigate the 184 Hg [26] and 186,188 Hg [14,27] isotopes, respectively. Moreover, the lifetimes of low-lying states in 190−196 Hg isotopes, which could not be obtained via RDDS method due to the presence of low-lying isomers, were recently measured via the FT technique [27,28].…”

Section: Charge Radius [Fm]mentioning

confidence: 99%

Shape coexistence in the neutron-deficient $^{188}$Hg investigated via lifetime measurements

Siciliano,

Zanon,

Goasduff

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Background: Shape coexistence in the Z ≈ 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 188 Hg isotope. Purpose: The aim of this work was to measure lifetimes of excited states in 188 Hg 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 188 Hg nucleus was populated using two different fusion-evaporation reactions with two targets, 158 Gd and 160 Gd, and a beam of 34 S 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 γ rays were detected using the GALILEO γ-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 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 188 Hg 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 5-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.

show abstract

“…Further information on collective structures in neutrondeficient Hg nuclei was provided by measurements of γray transition strengths. Lifetimes of excited states were measured for several neutron-deficient species, populated via fusion-evaporation reactions: the 178 Hg [21], 180,182 Hg [22,23], and 184,186 Hg [16,24,25] nuclei were studied using the recoil-distance Doppler-shift (RDDS) method, while the Doppler-shift attenuation method (DSAM) and the β-tagged fast-timing (FT) techniques were employed to investigate the 184 Hg [26] and 186,188 Hg [14,27] isotopes, respectively. Moreover, the lifetimes of low-lying states in [190][191][192][193][194][195][196] Hg isotopes, which could not be obtained via RDDS method due to the presence of low-lying isomers, were recently measured via the FT technique [27,28].…”

Section: Introductionmentioning

confidence: 99%