Nuclear structure of 76Ge from proton-neutron interacting boson model calculations

Zhang, Dali; Mu, Cheng-Fu

doi:10.1007/s11433-017-9090-y

Cited by 5 publications

(6 citation statements)

References 40 publications

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“…It is well known that the low-lying structure of Ge isotopes shows the coexistence of different shapes along the long isotopic chain, characterized by prolate-oblate and spherical-deformed competition. Close to the β-stability line, the shape transition of Ge isotopes is a drastic evolution from nearly spherical in 72 Ge to slight prolate in 74 Ge or even triaxiality in 76,78 Ge [19][20][21][22] and 84,86,88 Ge [23]. In the neutron-rich region, the B(E2) behavior has a smooth decrease toward N = 50 [24].…”

Section: Introductionmentioning

confidence: 99%

Shape coexistence close to N = 50 in the neutron-rich isotope ⁸⁰ Ge investigated by IBM-2

Zhang

2018

Chinese Phys. C

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The properties of the low-lying states, especially the relevant shape coexistence in 80 Ge, close to one of most neutron-rich doubly magic nuclei at N = 50 and Z = 28, have been investigated within the framework of the proton-neutron interacting model (IBM-2). Based on the fact that the relative energy of the d neutron boson is different from that of the proton boson, the calculated energy levels of low-lying states and E2 transition strengths can reproduce the experimental data very well. Particularly, the first excited state 0 + 2 , which is intimately related to the shape coexistence phenomenon, is reproduced quite nicely. The ρ 2 (E0,0 + 2 → 0 + 1 ) transition strength is also predicted. The experimental data and theoretical results indicate that both collective spherical and γ-soft vibration structures coexist in 80 Ge.

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Section: Introductionmentioning

confidence: 99%

Shape coexistence close to N = 50 in the neutron-rich isotope ⁸⁰ Ge investigated by IBM-2

Zhang

2018

Chinese Phys. C

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“…The IBM-1 has U(6) symmetry group [42]. By differentiating neutron bosons from proton bosons, the IBM-1 is extended to proton-neutron interacting boson model or IBM-2 [43][44][45][46][47]. The IBM-2 possesses a much richer phase structure and demonstrates a more predictive power in dealing with nuclear experimental data.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Shape coexistence in ⁷⁶Se within the neutron–proton interacting boson model

Mu¹,

Zhang²

2022

Commun. Theor. Phys.

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We have investigated the low-lying energy spectrum and electromagnetic transition strengths in even-even $^{76}$Se using the proton-neutron interacting boson model (IBM-2). The theoretical calculation for the energy levels and $E2$ and $M1$ transition strengths is in good agreement with the experimental data. Especially, the excitation energy and $E2$ transition of $0^+_2$ state, which is intimately associated with shape coexistence, can be well reproduced. The analysis on low-lying states and some key structure indicators indicates that there is a coexistence between spherical shape and $\gamma$-soft shape in $^{76}$Se.

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“…In recent years, considerable experimental and theoretical effort has been directed to the studies of the shell structure of neutron-rich nuclei near the proton number . In this region, the germanium isotopes ( ) have attracted much attention due to their complex lowlying structure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. It shows an irregular behavior when the neutron number varies from to , and is accompanied with the competition between the single-particle energy gap and the collective effects.…”

Section: Introductionmentioning

confidence: 99%

“…The low-lying states of even-even Ge nuclei were described in terms of shape transition from nearly spherical in 70 Ge to weakly deformed in 72,74 Ge, and even soft triaxial in 76,78 Ge, with shape coexistence possibly occurring in these nuclei [1][2][3]. To understand the structure of these nuclei, the electric quadrupole moment and the magnetic moment (or the factor) have been of experimental interest [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic properties of neutron-rich Ge isotopes *

Jiang¹,

Tang²,

Shen³

et al. 2019

Chinese Phys. C

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The electric quadrupole moment and the magnetic moment (or the factor) of low-lying states in even-even nuclei 72-80Ge and odd-mass nuclei 75-79Ge are studied in the framework of the nucleon pair approximation (NPA) of the shell model, assuming the monopole and quadrupole pairing plus quadrupole-quadrupole interaction. Our calculations reproduce well the experimental values of and for 72,74,76Ge, as well as the yrast energy levels of these isotopes. The structure of the states and the contributions of the proton and neutron components in and are discussed in the -pair truncated shell-model subspace. The overall trend of and as a function of the mass number , as well as their signs, are found to originate essentially from the proton contribution. The negative value of in 72,74Ge is suggested to be due to the enhanced quadrupole-quadrupole correlation and configuration mixing.

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Nuclear structure of 76Ge from proton-neutron interacting boson model calculations

Cited by 5 publications

References 40 publications

Shape coexistence close to N = 50 in the neutron-rich isotope ⁸⁰ Ge investigated by IBM-2

Shape coexistence close to N = 50 in the neutron-rich isotope ⁸⁰ Ge investigated by IBM-2

Shape coexistence in ⁷⁶Se within the neutron–proton interacting boson model

Electromagnetic properties of neutron-rich Ge isotopes *

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Nuclear structure of 76Ge from proton-neutron interacting boson model calculations

Cited by 5 publications

References 40 publications

Shape coexistence close to N = 50 in the neutron-rich isotope 80 Ge investigated by IBM-2

Shape coexistence close to N = 50 in the neutron-rich isotope 80 Ge investigated by IBM-2

Shape coexistence in 76Se within the neutron–proton interacting boson model

Electromagnetic properties of neutron-rich Ge isotopes *

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Shape coexistence close to N = 50 in the neutron-rich isotope ⁸⁰ Ge investigated by IBM-2

Shape coexistence close to N = 50 in the neutron-rich isotope ⁸⁰ Ge investigated by IBM-2

Shape coexistence in ⁷⁶Se within the neutron–proton interacting boson model