Coulomb excitation of 78Kr

Becker, F.; Petrovici, A.; Iwanicki, J.; Amzal, N.; Körten, W.; Hauschild, K.; Hürstel, A.; Theisen, Ch.; Butler, P. A.; Cunningham, R.A.; Czosnyka, T.; Gerl, J.; Greenlees, P. T.; Helariutta, K.; Herzberg, R.‐D.; Jones, P.; Julin, R.; Juutinen, S.; Kankaanpää, H.; Muikku, M.; Nieminen, P.; Radu, O.; Rahkila, P.; Schlegel, C.

doi:10.1016/j.nuclphysa.2006.01.018

Cited by 28 publications

(13 citation statements)

References 25 publications

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“…is more concentrated above (plus) or below (minus) γ = 30 • . Comparing with the available data, a good agreement in the neutron deficient 74−78 Kr [8,20] (prolate) and stable 84 Kr [46] (slightly prolate) isotopes is found but not for the neutron rich 92−96 Kr nuclei recently measured [11,12]. The latter are experimentally prolate deformed while the present calculations predict an oblate character.…”

Section: Systematics Of the Electromagnetic Transition Probabiliticontrasting

confidence: 39%

“…Due to the huge number of possible configurations, conventional large scale shell model calculations are still out of reach in this region. Nevertheless, results using the shell model Monte Carlo (SMMC) approach with a pairing plus quadrupole interaction [18], the VAMPIR method with an effective G-matrix defined in a reduced valence space [19,20] and the five dimensional collective hamiltonian (5DCH), also with a pairing plus quadrupole interaction [21], have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Structure of krypton isotopes calculated with symmetry-conserving configuration-mixing methods

Rodrı́guez

2014

Phys. Rev. C

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Shape transitions and shape coexistence in the 70−98 Kr region are studied in a unified view with state-of-the-art beyond self-consistent mean field methods based on the Gogny D1S interaction. Beyond mean field effects are taken into account through the exact angular momentum and particle number restoration and the possibility of axial and non-axial shape mixing. The results of the low-lying properties of these isotopes are in good agreement with the experimental data when the triaxial degree of freedom is included. Shape transitions from axial-oblate ( 70−72 Kr) to triaxialprolate ( 74−78 Kr) and from spherical-triaxial ( 86−92 Kr) to axial-oblate ( 94−98 Kr) ground states are obtained. Additionally, low-lying 0 + excited states and quasi-gamma bands are found showing the richness of the collective structure in this region.

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Section: Systematics Of the Electromagnetic Transition Probabiliticontrasting

confidence: 39%

Section: Introductionmentioning

confidence: 99%

Structure of krypton isotopes calculated with symmetry-conserving configuration-mixing methods

Rodrı́guez

2014

Phys. Rev. C

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“…Subsequent experiments revealed the rich structure of the low-lying excitation spectrum in these nuclei, with coexisting and mixed bands in 72−78 Kr [14,15,16]. Many more data on transition probabilities, both in and out of bands, have also now become available [17,18,19,20,21,22,23,24,25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Shape coexistence in neutron-deficient Kr isotopes: Constraints on the single-particle spectrum of self-consistent mean-field models from collective excitations

2006

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We discuss results obtained in the study of shape coexistence in the neutron-deficient 72−78 Kr isotopes. The method that we used is based on the mixing of axial mean-field configurations after their projection on particle-number and angular-momentum. The calculations are performed with a Skyrme interaction and a density-dependent pairing interaction. While our calculation reproduces qualitatively and quantitatively many of the global features of these nuclei, such as coexistence of prolate and oblate shapes, their strong mixing at low angular momentum, and the deformation of collective bands, the ordering of our calculated low-lying levels is at variance with experiment. We analyse the role of the single-particle spectrum of the underlying mean-field for the spectrum of collective excitations.

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“…For example, Coulomb-excitation measurements of radioactive 74,76 Kr, performed by Clement et al, [4], indicate a near-axial prolate ground state coexisting with a largely triaxial configuration. Measurements of stable 78 Kr [5,6] support this picture of a near axially-deformed prolate ground-state and a triaxial coexisting configuration.…”

Section: Introductionmentioning

confidence: 63%

Coulomb excitation of Kr80,82 and a change in structure approaching N=Z=40

Gillespie¹,

Henderson²,

Abrahams³

et al. 2021

Phys. Rev. C

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Background: Nuclei approaching N = Z = 40 are known to exhibit strongly deformed structures and are thought to be candidates for shape coexistence. In the krypton isotopes 80,82 Kr are poorly characterized, preventing understanding of evolving deformation approaching N = 40.Purpose: The present work aims to determine electric quadrupole transition strengths and quadrupole moments of 80,82 Kr in order to better characterize their deformation.Methods: Sub-barrier Coulomb excitation was employed, impinging the isotopes of krypton on 196 Pt and 208 Pb targets. Utilizing a semi-classical description of the safe Coulomb-excitation process E2 matrix elements could then be determined.Results: Eleven new or improved matrix elements are determined in 80 Kr and six in 82 Kr. The new B(E2; 0 + 1 → 2 + 1 ) value in 82 Kr disagrees with the evaluated value by 3σ, which can be explained in terms of deficiencies in a previous Coulomb-excitation analysis.Conclusions: Comparison of measured Qs 2 + 1 and B(E2; 0 + 1 → 2 + 1 ) values indicates that neutron-deficient (N ≤ 42) isotopes of krypton are closer to axial deformation than other isotopic chains in the mass region. A continuation of this trend to higher Z may result in Sr and Zr isotopes exhibiting near-axial prolate deformation.

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Coulomb excitation of 78Kr

Cited by 28 publications

References 25 publications

Structure of krypton isotopes calculated with symmetry-conserving configuration-mixing methods

Structure of krypton isotopes calculated with symmetry-conserving configuration-mixing methods

Shape coexistence in neutron-deficient Kr isotopes: Constraints on the single-particle spectrum of self-consistent mean-field models from collective excitations

Coulomb excitation of Kr80,82 and a change in structure approaching N=Z=40

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