Shape staggering of midshell mercury isotopes from in-source laser spectroscopy compared with density-functional-theory and Monte Carlo shell-model calculations

Sels, S.; Goodacre, T. Day; Marsh, B. A.; Pastore, A.; Ryssens, Wouter; Tsunoda, Y.; Althubiti, N. A.; Andel, B.; Andreyev, A. N.; Atanasov, D.; Barzakh, A. E.; Bender, M.; Billowes, J.; Blaum, Klaus; Cocolios, T. E.; Cubiss, J. G.; Dobaczewski, J.; Farooq-Smith, G. J.; Fedorov, D. V.; Fedosseev, V. N.; Flanagan, Kieran; Gaffney, L. P.; Ghys, L.; Heenen, P. H.; Huýse, M.; Kreim, S.; Lunney, D.; Lynch, K. M.; Manea, V.; Palenzuela, Y. Martinez; Medonca, T. M.; Molkanov, P. L.; Otsuka, Takaharu; Ramos, J.P.; Rossel, R. E.; Rothe, S.; Schweikhard, L.; Seliverstov, M. D.; Spagnoletti, P.; Beveren, C. Van; Duppen, P. Van; Veinhard, Matthieu; Verstraelen, E.; Welker, A.; Wendt, Κ.; Wienholtz, F.; Wolf, R.; Zadvornaya, A.

doi:10.1103/physrevc.99.044306

Cited by 55 publications

(34 citation statements)

References 103 publications

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“…A detailed description of the experiment can be found in Refs. [3,4], while only the information pertinent to the present work is provided here. In our study, 180 Pt was produced in the 180 Hg → 180 Au → 180 Pt β-decay chain, shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

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α -decay branching ratio of Pt180

et al. 2020

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A study of the 180 Hg decay chain performed at the CERN-ISOLDE facility has allowed the ground-state-toground-state α decay of 180 Pt to be investigated. A more precise α-decay branching ratio of b α ( 180 Pt) = 0.52(5)% has been deduced. The reduced α-decay width calculated using the new value provides a more consistent picture of the systematics for J π = 0 + → 0 + ground-state-to-ground-state state α decays of neutron-deficient, eveneven platinum isotopes.

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Section: Methodsmentioning

confidence: 99%

“…This value was extracted from decay data recorded during the same experiment as described in Refs. [3,4].…”

Section: Introductionmentioning

confidence: 99%

α -decay branching ratio of Pt180

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“…For the cases where this recipe is not possible, the V MU interaction is used. Note that the V MU interaction was determined as a simple modeling to the microscopic shell-model interactions [18], and that it was used in earlier studies on Zr, Sn and Hg isotopes [20][21][22][23][24]. The dimension of the many-body Hilbert space reaches beyond 10 31 , which is formidably larger than the current limit (∼10 11 ) of the conventional CI method.…”

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“…Figure 3 shows a deeper insight in the calculation performed for 154 Sm. It includes Potential Energy Surface (PES) obtained by Hartree-Fock calculation using the same Hamiltonian with, as constraints, the quadrupole moments corresponding to specific values of β 2 and γ (their relations are explained in [23,24,36]). The latter are shape variables of the ellipsoidal shape being the magnitude and the proportion of the ellipsoid axes, respectively (see Fig.…”

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“…The resistance-control force, i.e. the monopole interaction, does not promote the collective mode by itself, but can change the "environment" : the ESPEs are optimized to different collective modes giving rise to a large diversity of phenomena [20,21,23,24,37,38,55,56]. Although the CI calculations can be refined, the overall agreement to experiments suggests the validity of the underlying picture, shifting our basic understanding from the Liquid Drop model including its quantized forms to a more explicit multi-nucleon description with aspects such as shape coexistence, triaxial instability and shell evolution.…”

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Underlying Structure of Collective Bands and Self-Organization in Quantum Systems

et al. 2019

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The underlying structure of low-lying collective bands of atomic nuclei is discussed from a novel perspective on the interplay between single-particle and collective degrees of freedom, by utilizing state-of-the-art configuration interaction calculations on heavy nuclei. Besides the multipole components of the nucleon-nucleon interaction that drive collective modes forming those bands, the monopole component is shown to control the resistance against such modes. The calculated structure of 154 Sm corresponds to coexistence between prolate and triaxial shapes, while that of 166 Er exhibits a deformed shape with a strong triaxial instability. Both findings differ from traditional views based on β/γ vibrations. The formation of collective bands is shown to be facilitated from a self-organization mechanism.The structure of atomic nuclei exhibits single-particle as well as collective-mode aspects created by the protons and neutrons (nucleons). The former has been characterized by the shell structure shown initially by Mayer [1] and Jensen [2], while the latter has presented a variety of nuclear shapes following Rainwater [3], and Bohr and Mottelson [4][5][6]. The two aspects lead to "the problem of reconciling the simultaneous occurrence of single-particle and collective degrees of freedom ..." [7]. This is one of the most important basic questions in nuclear structure research, and it remains open. For instance, G.E. Brown has addressed the question, "how single particle states can coexist with collective modes", throughout his life [8]. We discuss in this Letter this problem from a novel perspective.Nucleons in an atomic nucleus occupy single-particle orbits in various configurations. The effective nucleonnucleon (NN) interaction in nuclei induces multi-nucleon correlations by mixing such configurations. This mixing occurs, in many cases, basically for "valence" nucleons in single-particle orbits on top of the appropriate closed proton and neutron shell (inert core). The ellipsoidal shapes correspond to such correlations having the nature of quadrupole surface deformation from a sphere, driven by the quadrupole component of the NN interaction [9][10][11][12][13][14]. This gives rise to an interplay between collective mode and single-particle states (SPS's). If SPS's relevant to these correlations are separated by large gaps, the mixing between them and the resulting correlations are reduced. Thus, the SPS's can act as a "resistance" to (the formation of) collective modes. In this Letter, we first present how ellipsoidal shapes emerge from multi-nucleon systems by using the state-of-the-art Configuration Interaction (CI) simulations, called Monte Carlo Shell Model (MCSM) [15,16]. This allowed us to uncover a novel mechanism: the monopole component of the NN interaction shifts the single-particle energies (SPEs) effectively, weakening the "resistance" against deformation, and thus 2 + 4 + a b 0 1 2 E (MeV) N N 0 100 200 B(E2) (W.u.) 4+ calc. 2+ calc. 2+ exp. 4+ exp. -2 -1 0 Q (eb)c N 84 88 92 84 88 92 84 88 92 2+ calc...

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Ionization Scheme Development for the ISOLDE RILIS

Goodacre

2021

Applied Laser Spectroscopy for Nuclear Physics

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Shape staggering of midshell mercury isotopes from in-source laser spectroscopy compared with density-functional-theory and Monte Carlo shell-model calculations

Cited by 55 publications

References 103 publications

α -decay branching ratio of Pt180

α -decay branching ratio of Pt180

Underlying Structure of Collective Bands and Self-Organization in Quantum Systems

Ionization Scheme Development for the ISOLDE RILIS

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