Microscopic description of low-lying states in even Ge and Se nuclei

Petrovici, A.; Schmid, K.W.; Grümmer, F.; Faessler, Amand; Horibata, Takatoshi

doi:10.1016/0375-9474(88)90539-8

Cited by 50 publications

(44 citation statements)

References 26 publications

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“…Low-spin positive-parity states in 70 Ge were interpreted by several authors using various theoretical models [29][30][31]. In the present work, the observed band structures and shape evolution are discussed using standard cranked shell model and triaxial projected shell model approaches.…”

Section: Discussionmentioning

confidence: 93%

Observation of aγband based on a two-quasiparticle configuration inGe70

et al. 2016

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The structure of 70 Ge has been studied through in-beam gamma ray spectroscopy. A new band structure is identified that leads to forking of the ground-state band into two excited bands. Band structures have been investigated using the microscopic triaxial projected shell model approach. The observed forking is demonstrated to result from almost simultaneous band crossing of the twoneutron aligned and the γ-band built on this two-quasiparticle configuration with the ground-state band.

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Section: Discussionmentioning

confidence: 93%

Observation of aγband based on a two-quasiparticle configuration inGe70

et al. 2016

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“…To investigate possible shape coexistence phenomena the excited T = 1 states of 66 As, and other nuclei of interest, have been calculated using the complex excited Vampir model [21]. This model has been successfully applied for a microscopic description of analog states in the A = 70 mass region [22].…”

Section: B Complex Excited Vampir Calculationsmentioning

confidence: 99%

Shape isomerism and shape coexistence effects on the Coulomb energy differences in theN=Znucleus66As and neighboringT<

Angelis¹,

Wiedemann²,

Martínez³

et al. 2012

Phys. Rev. C

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Excited states of the N = Z = 33 nucleus 66 As have been populated in a fusion-evaporation reaction and studied using γ -ray spectroscopic techniques. Special emphasis was put into the search for candidates for the T = 1 states. A new 3 + isomer has been observed with a lifetime of 1.1(3) ns. This is believed to be the predicted oblate shape isomer. The excited levels are discussed in terms of the shell model and of the complex excited Vampir approaches. Coulomb energy differences are determined from the comparison of the T = 1 states with their analog partners. The unusual behavior of the Coulomb energy differences in the A = 70 mass region is explained through different shape components (oblate and prolate) within the members of the same isospin multiplets. This breaking of the isospin symmetry is attributed to the correlations induced by the Coulomb interaction.

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“…The description of phenomena where the nucleus serves as laboratory for fundamental effects requires particularly high accuracy of the nuclear structure models. On the other hand, particular components of the effective nucleonnucleon interaction known to have direct relevance to spin-isospin properties play an essential role for the oblateprolate competition and mixing in the A∼70 mass region, too, as it is demonstrated in our studies within the Vampir models [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 59%

Isospin-symmetry-breaking effects in A∼70 nuclei within beyond-mean-field approach

Petrovici¹,

Andrei²

2015

AIP Conference Proceedings

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Abstract. Particular isospin-symmetry-breaking probes including Coulomb energy differences (CED), mirror energy differences (MED), and triplet energy differences (TED) manifest anomalies in the A∼70 isovector triplets of nuclei. The structure of proton-rich nuclei in the A∼70 mass region suggests shape coexistence and competition between pairing correlations in different channels. Recent results concerning the interplay between isospin-mixing and shape-coexistence effects on exotic phenomena in A∼70 nuclei obtained within the beyond-mean-field complex Excited Vampir variational model with symmetry projection before variation using a realistic effective interaction in a relatively large model space are presented. Excited Vampir predictions concerning the Gamow-Teller β decay to the odd-odd N=Z 66 As and 70 Br nuclei correlated with the pair structure analysis in the T=1 and T=0 channel of the involved wave functions are discussed.

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Microscopic description of low-lying states in even Ge and Se nuclei

Cited by 50 publications

References 26 publications

Observation of aγband based on a two-quasiparticle configuration inGe70

Observation of aγband based on a two-quasiparticle configuration inGe70

Shape isomerism and shape coexistence effects on the Coulomb energy differences in theN=Znucleus66As and neighboringT<

Isospin-symmetry-breaking effects in A∼70 nuclei within beyond-mean-field approach

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