Shape Coexistence at Zero Spin in 
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 Driven by the Monopole Tensor Interaction

Mărginean, N.; Little, David; Tsunoda, Y.; Leoni, S.; Janssens, R. V. F.; Fornal, B.; Otsuka, Takaharu; Michelagnoli, C.; Stan, L.; Crespi, F. C. L.; Costache, C.; Lică, R.; Sferrazza, Michele; Turturică, A.; Ayangeakaa, A. D.; Auranen, K.; Barani, M.; Bender, P. C.; Bottoni, S.; Boromiza, M.; Bracco, A.; Călinescu, S.; Campbell, C. M.; Carpenter, M. P.; Chowdhury, P.; Ciemała, M.; Cieplicka-Oryńczak, N.; Cline, D.; Clisu, C.; Crawford, H. L.; Dinescu, Irina; Dudouet, J.; Filipescu, D.; Florea, Nicoleta Mihaela; Forney, A. M.; S., Fracassetti,; Gade, A.; Gheorghe, I.; Hayes, A. B.; Harca, I. M.; Henderson, J.; Ionescu, A.; Iskra, Ł. W.; Jentschel, M.; Kandzia, F.; Kim, Y. H.; Kondev, F. G.; Korschinek, G.; Köster, U.; Krishichayan,; Krzysiek, M.; Lauritsen, T.; J., Li,; Mărginean, R.; Maugeri, E. A.; Mihai, C.; Mihai, R.; Mitu, A.; Mutti, P.; Negreţ, A.; Niță, Cristina; Olacel, Adina; Oprea, A.; Pascu, S.; Petrone, C.; Porzio, C.; Rhodes, D.; Seweryniak, D.; Schumann, D.; Sotty, C.; Stolze, Sanna; Șuvăilă, Rareș; Toma, S.; Ujeniuc, S.; Walters, W. B.; Wu, Chuanbin; Wu, J.; Zhu, S.; Ziliani, S.

doi:10.1103/physrevlett.125.102502

Cited by 30 publications

(20 citation statements)

References 41 publications

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“…where e is the unit charge; e p (e n ) denotes proton (neutron) effective charge induced by inmedium (or core-polarization) effects; and R 0 stands for the radius parameter of the droplet model (spherical background) (see [73] for some detailed explanation). The relations in Equations ( 18) and ( 19) worked very well in many works, for instance [64,[69][70][71]. Figure 14c,d shows the T-plot for the original interaction, where the PES is shown by using β 2 and γ as coordinates (see Figure 14a).…”

Section: Shape Coexistence In 154 Smmentioning

confidence: 75%

“…Type-II shell evolution occurs in various cases, especially in a number of shape coexistence cases, providing deformed states with stronger deformation, lower excitation energies, and more stabilities. It is an appearance of the monopole-quadrupole interplay and plays crucial roles in various phenomena including the first-order quantum phase transition (Zr isotopes [65][66][67]), the second-order quantum phase transition (Sn isotopes [68]), the multiple even-odd quantum phase transitions (Hg isotopes [69]), as well as the raising of the intruder band due to the suppression of the type-II shell evolution (lighter Ni isotopes [64,70]). As the involvement of the monopole interaction in this manner had not been recognized, type-II shell evolution appears to be among the emerging concepts of nuclear structure.…”

Section: Short Summary Of This Sectionmentioning

confidence: 99%

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Emerging Concepts in Nuclear Structure Based on the Shell Model

Otsuka

2022

Physics

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Some emerging concepts of nuclear structure are overviewed. (i) Background: the many-body quantum structure of atomic nucleus, a complex system comprising protons and neutrons (called nucleons collectively), has been studied largely based on the idea of the quantum liquid (à la Landau), where nucleons are quasiparticles moving in a (mean) potential well, with weak “residual” interactions between nucleons. The potential is rigid in general, although it can be anisotropic. While this view was a good starting point, it is time to look into kaleidoscopic aspects of the nuclear structure brought in by underlying dynamics and nuclear forces. (ii) Methods: exotic features as well as classical issues are investigated from fresh viewpoints based on the shell model and nucleon–nucleon interactions. The 70-year progress of the shell–model approach, including effective nucleon–nucleon interactions, enables us to do this. (iii) Results: we go beyond the picture of the solid potential well by activating the monopole interactions of the nuclear forces. This produces notable consequences in key features such as the shell/magic structure, the shape deformation, the dripline, etc. These consequences are understood with emerging concepts such as shell evolution (including type-II), T-plot, self-organization (for collective bands), triaxial-shape dominance, new dripline mechanism, etc. The resulting predictions and analyses agree with experiment. (iv) Conclusion: atomic nuclei are surprisingly richer objects than initially thought.

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Section: Shape Coexistence In 154 Smmentioning

confidence: 75%

Section: Short Summary Of This Sectionmentioning

confidence: 99%

Emerging Concepts in Nuclear Structure Based on the Shell Model

Otsuka

2022

Physics

Self Cite

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show abstract

“…Let us take an example. Figure 12 [59] depicts the PES of 66 Ni with the same Hamiltonian as in Fig. 10.…”

Section: Tplot Analysismentioning

confidence: 99%

“…Type II shell evolution occurs in various cases, especially in a number of shape coexistence cases, providing deformed states with stronger deformation, lower excitation energies and more stabilities. It is an appearance of the monopolequadrupole interplay, and plays crucial roles in various phenomena including the first order phase transition (Zr isotopes [61][62][63]), the second order phase transition (Sn isotopes [64]), the multiple even-odd phase transitions (Hg isotopes [65]) as well as the raising of the intruder band due to the suppression of the type II shell evolution (lighter Ni isotopes [59,66]). As the involvement of the monopole interaction in this manner had not been recognized, Type II shell evolution appears to be among the emerging concepts of nuclear structure.…”

Section: E Short Summary Of Sec IIImentioning

confidence: 99%

Emerging concepts in nuclear structure based on the shell model

Otsuka¹

2022

Preprint

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Some emerging concepts of nuclear structure are overviewed. (1) Background: the many-body quantum structure of atomic nucleus, a complex system comprising protons and neutrons (called nucleons collectively), has been studied largely based on the idea of the quantum liquid (a la Landau), where nucleons are quasiparticles moving in a (mean) potential well, with weak "residual" interactions between nucleons. The potential is rigid in general, although it can be anisotropic. While this view was a good starting point, it is time to look into kaleidoscopic aspects of the nuclear structure brought in by underlying dynamics and nuclear forces. (2) Methods: exotic features as well as classical issues are investigated from fresh viewpoints based on the shell model and nucleon-nucleon interactions. The 70-year progress of the shell-model approach, including effective nucleon-nucleon interactions, enables us to do this. (3) Results: we go beyond the picture of the solid potential well by activating the monopole interactions of the nuclear forces. This produces notable consequences in key features such as the shell/magic structure, the shape deformation, the dripline, etc. These consequences are understood with emerging concepts such as shell evolution (incl. type-II), T-plot, self-organization (for collective bands), triaxial-shape dominance, new dripline mechanism, etc. The resulting predictions and analyses agree with experiment. (4) Conclusion: atomic nuclei are surprisingly richer objects than initially thought.

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“…Tentative spin assignments are shown by open symbols. Data are taken from the ENSDF database[34][35][36][37]. See text for details.…”

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confidence: 99%

Low-Energy Coulomb Excitation for the Shell Model

Rocchini

Zielińska

2021

Physics

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Low-energy Coulomb excitation is capable of providing unique information on static electromagnetic moments of short-lived excited nuclear states, including non-yrast states. The process selectively populates low-lying collective states and is, therefore, ideally suited to study phenomena such as shape coexistence and the development of exotic deformation (triaxial or octupole shapes). Historically, these experiments were restricted to stable isotopes. However, the advent of new facilities providing intense beams of short-lived radioactive species has opened the possibility to apply this powerful technique to a much wider range of nuclei. The paper discusses the observables that can be measured in a Coulomb-excitation experiment and their relation to the nuclear structure parameters with an emphasis on the nuclear shape. Recent examples of Coulomb-excitation studies that provided outcomes relevant for the Shell Model are also presented.

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Shape Coexistence at Zero Spin in Ni64 Driven by the Monopole Tensor Interaction

Cited by 30 publications

References 41 publications

Emerging Concepts in Nuclear Structure Based on the Shell Model

Emerging Concepts in Nuclear Structure Based on the Shell Model

Emerging concepts in nuclear structure based on the shell model

Low-Energy Coulomb Excitation for the Shell Model

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