Discovery of a very low-lying 0+ state in 98Sr and shape coexistence implication in 98Sr

Schüßler, F.; Pinston, J.A.; Monnand, E.; Moussa, A.; Jung, G.; Koglin, E.; Pfeiffer, B.; Janssens, R. V. F.; Klinken, J. van

doi:10.1016/0375-9474(80)90024-x

Cited by 96 publications

(63 citation statements)

References 18 publications

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“…Such a model has been applied to 98 Sr in the past, but with less detailed experimental data. Schussler et al [20], using the measured lifetime of the 2 98 Rb β decay combined with a systematic study of neighboring Kr, Zr, and Mo isotopes. Following the method described in our previous work [41], we have extracted from the complete set of E2 matrix elements the mixing angles for the 0 + and 2 + states wave functions [22,23], which are presented in Table VI.…”

Section: Discussionmentioning

confidence: 99%

“…has an E2/M1 character without any E0 admixture, as in earlier electron spectroscopy studies [12,20,21] no electron peak was observed corresponding to the decay of the 2 + 2 state at 871 keV. Data collected using the 60 Ni and 208 Pb targets were fitted simultaneously in order to enhance sensitivity to higher-order effects, such as quadrupole moments and relative signs of electromagnetic matrix elements.…”

Section: Coulomb Excitation Analysismentioning

confidence: 99%

“…In 98 Sr, the ground-state band has a rotational character, and the large B(E2) values between its members, deduced from lifetime measurements [10,[14][15][16][17][18][19], are consistent with a deformed character of the ground state. A low-lying 0 + 2 state at 215.3 keV was established by Schussler et al [20] and interpreted as the band head of a presumably spherical structure. A strong electric monopole transition of ρ 2 (E0) = 0.053 (5) was measured between the 0 + 2 and the 0 + 1 states, again supporting the shape coexistence scenario [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…A low-lying 0 + 2 state at 215.3 keV was established by Schussler et al [20] and interpreted as the band head of a presumably spherical structure. A strong electric monopole transition of ρ 2 (E0) = 0.053 (5) was measured between the 0 + 2 and the 0 + 1 states, again supporting the shape coexistence scenario [20,21].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Coulomb Excitation Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-energy Coulomb excitation of Sr96,98 beams

Clément¹,

Zielińska²,

Péru³

et al. 2016

Phys. Rev. C

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“…For neutron-rich Sr and Zr isotopes, lots of spectroscopic data have been measured [1][2][3][4][5][6][7][8][9][10][11]. The abrupt changing in the lifetimes and excitation energies of 2 + 1 states, two-neutron separation energies and rms charge radii indicates a sudden onset of large quadrupole deformation at neutron number N = 60.…”

Section: Introductionmentioning

confidence: 99%

Rapid structural change in low-lying states of neutron-rich Sr and Zr isotopes

et al. 2012

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The rapid structural change in low-lying collective excitation states of neutron-rich Sr and Zr isotopes is studied by solving a five-dimensional collective Hamiltonian with parameters determined by both relativistic mean-field and non-relativistic Skyrme-Hartree-Fock calculations using the PC-PK1 and SLy4 forces respectively. Pair correlations are treated in BCS method with either a separable pairing force or a density-dependent zero-range force. The isotope shifts, excitation energies, electric monopole and quadrupole transition strengths are calculated and compared with corresponding experimental data. The calculated results with both the PC-PK1 and SLy4 forces exhibit a picture of spherical-oblate-prolate shape transition in neutron-rich Sr and Zr isotopes. Compared with the experimental data, the PC-PK1 (or SLy4) force predicts a more moderate (or dramatic) change in most of the collective properties around N = 60. The underlying microscopic mechanism responsible for the rapid transition is discussed.

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