Gamma-gamma angular correlation measurements of transitions in98Sr and98Zr and confirmation of shape coexistence in98Sr

Becker, Katja; Jung, G.; Kobras, K.; Wöllnik, H.; Pfeiffer, B.

doi:10.1007/bf01415633

Cited by 34 publications

(20 citation statements)

References 19 publications

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“…The lowestmass example of identical bands known in two neighboring even-even nuclei was found in 98 Sr and 100 Sr [6,7]. Other discoveries also include the unusual low-lying excited 0 + states in 98 Sr and 100 Zr, which are interpreted as the evidence for shape coexistence [8][9][10], and the evidence for the emerging triaxial degree of freedom in the Mo-Ru isotopes [11,12].…”

Section: Introductionmentioning

confidence: 95%

Triaxiality and the alignedh11∕2neutron orbitals in neutron-rich Zr and Mo isotopes

et al. 2004

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Neutron-rich Zr and Mo isotopes were populated as fission fragments produced by the 238 U͑␣, f͒ fusionfission reaction. The level schemes of these nuclei have been extended beyond the first band crossing region, which can be ascribed to the h 11/2 neutron pair alignment. The spin alignment and signature splitting for the h 11/2 orbitals in term of triaxiality is addressed. The crossing frequency of the aligned bands in even Zr and Mo isotopes can be reproduced well by calculations using the cranked shell model. Compared to the Zr isotopes, band crossings in Mo isotopes shift to a lower rotational frequency due to the emerging importance of the ␥ degree of freedom. Within the framework of particle-rotor model, the difference in the signature splitting observed for the h 11/2 bands between the odd Zr and Mo isotopes can be attributed to the triaxial degree of freedom in the Mo isotopes. The surprising shift of the band crossing to a higher rotational frequency in 106 Mo is interpreted as a manifestation of the deformed subshell closure at N = 64.

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Section: Introductionmentioning

confidence: 95%

Triaxiality and the alignedh11∕2neutron orbitals in neutron-rich Zr and Mo isotopes

et al. 2004

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“…In Sr, Y, and Zr nuclei with N = 58 and 59, low-lying spherical states coexist with deformed rotational bands that appear around 1 MeV [3][4][5][6][7]. Further there is experimental evidence in 98 Sr and 100 Zr for an additional prolate-oblate shape coexistence [8][9][10], which is underlined by theoretical calculations [11,12]. This variety of different structures and configurations causes the complexity of this region but also provides a lot of potential to understand the transition from single-particle to collective behavior.…”

Section: Introductionmentioning

confidence: 96%

Lifetime measurements and shape coexistence in Sr97

et al. 2019

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Delayed γ rays from neutron-rich A = 97 fission fragments were measured using the Lohengrin spectrometer at the high-flux reactor of the Institut Laue-Langevin in Grenoble. Several lifetimes of excited states in 97 Sr were measured using the fast-timing technique. The nucleus 97 Sr exhibits shape coexistence and is located exactly at the border of the spherical (N 58) and deformed (N 60) ground-state deformation. It is of particular interest to study the shape-coexisting structures at the spherical-deformed border (N = 59). The determined lifetimes within this work are compared to an interacting boson-fermion model calculation that is based on the microscopic energy density functional to provide a better understanding of the spherical-deformed border in strontium isotopes.

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“…Conversion coefficients for the observed transitions were calculated using the BRICC calculator [44] except for the 50 keV 0 + 2 → 2 + 1 transition lying below the K edge, where the measured ICC value [45] was used. Influence of the g factor of the 2 + 1 state in 98 Sr on measured γ -ray yields due to deorientation effect was also investigated.…”

Section: Coulomb Excitation Analysismentioning

confidence: 99%

Low-energy Coulomb excitation of Sr96,98 beams

Clément¹,

Zielińska²,

Péru³

et al. 2016

Phys. Rev. C

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The structure of neutron-rich 96,98 Sr nuclei was investigated by low-energy safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN, with the MINIBALL spectrometer. A rich set of transitional and diagonal E2 matrix elements, including those for non-yrast structures, has been extracted from the differential Coulomb-excitation cross sections. The results support the scenario of a shape transition at N = 60, giving rise to the coexistence of a highly deformed prolate and a spherical configuration in 98 Sr, and are compared to predictions from several theoretical calculations. The experimental data suggest a significant contribution of the triaxal degree of freedom in the ground state of both isotopes. In addition, experimental information on low-lying states in 98 Rb has been obtained.

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Gamma-gamma angular correlation measurements of transitions in98Sr and98Zr and confirmation of shape coexistence in98Sr

Cited by 34 publications

References 19 publications

Triaxiality and the alignedh11∕2neutron orbitals in neutron-rich Zr and Mo isotopes

Triaxiality and the alignedh11∕2neutron orbitals in neutron-rich Zr and Mo isotopes

Lifetime measurements and shape coexistence in Sr97

Low-energy Coulomb excitation of Sr96,98 beams

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