Structure of even-even Sr isotopes with 
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 neutrons

Urban, W.; Sieja, K.; Rza̧ca‐Urban, T.; Wiśniewski, Jarosław A.; Blanc, A.; Jentschel, M.; Mutti, P.; Köster, U.; Söldner, T.; Simpson, G. S.; Ur, C. A.; Smith, Andrew; Greene, J. P.

doi:10.1103/physrevc.104.064309

Cited by 10 publications

(26 citation statements)

References 117 publications

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“…The systematics of the 0 + states was also discussed in the previous work (see Figure 11 of [23]), and a similar disagreement with the experiment was observed. The present calculations were performed with an improved shell model interaction, as described in Section 2, and provide an overall better agreement with the experiment in heavier Sr compared to the calculations from [23]. The problem of low-lying 0 + states remains anyway.…”

Section: Low-energy Spectra Of Even-even Sr Isotopesmentioning

confidence: 81%

“…As can be seen in Figure 9, it is the second excited 0 + from theory that closely follows the experimental data, while the first excited theoretical 0 + seems to have no counterpart. Based on the data from [23], it was not possible to clarify whether a low-energy 0 + excitation is systematically not observed in the experiment or the shell model underestimates the energy of the first excited 0 + state. To gain more insight into this issue, the distribution of one-particle removal spectroscopic factors was computed for the low-spin states in 94 Sr.…”

Section: Low-energy Spectra Of Even-even Sr Isotopesmentioning

confidence: 97%

“…In the present work, I revisit the approach of [7] and apply it to study the Sr isotopes, both even and odd between N = 50 and N = 58. Stimulated by the wealth of new data in this region [19][20][21][22][23][24], the calculations of the low-energy spectra, transition rates, and spectroscopic factors are performed and discussed. The approach from [7] was previously applied in [25] to study 92−96 Sr, with an emphasis on negative parity excitations.…”

Section: Introductionmentioning

confidence: 99%

“…The approach from [7] was previously applied in [25] to study 92−96 Sr, with an emphasis on negative parity excitations. Recently, more shell model results within this approach were presented in [23], but the calculations were limited to even-even isotopes up to N = 58. The present work extends the application to the odd-even Sr isotopes and in terms of the configuration spaces employed.…”

Section: Introductionmentioning

confidence: 99%

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Single-Particle and Collective Structures in Neutron-Rich Sr Isotopes

Sieja

2021

Universe

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Neutron-rich Sr nuclei around N=60 exhibit a sudden shape transition from a spherical ground state to strongly prolate-deformed. Recently, much new insight into the structure of Sr isotopes in this region has been gained through experimental studies of the excited levels, transition strengths, and spectroscopic factors. In this work, a “classic” shell model description of strontium isotopes from N=50 to N=58 is provided, using a natural valence space outside the 78Ni core. Both even–even and even–odd isotopes are addressed. In particular, spectroscopic factors are computed to shed more light on the structure of low-energy excitations and their evolution along the Sr chain. The origin of deformation at N=60 is mentioned in the context of the present and previous shell model and Monte Carlo shell model calculations.

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Section: Low-energy Spectra Of Even-even Sr Isotopesmentioning

confidence: 81%

Section: Low-energy Spectra Of Even-even Sr Isotopesmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single-Particle and Collective Structures in Neutron-Rich Sr Isotopes

Sieja

2021

Universe

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“…More recently, the same group [51] reinvestigated the excited states of 90,92,94,96,98 Sr using Exogam and Gammasphere arrays. 23 new levels with 30 new decays were obtained in four nuclei.…”

Section: Experimental Data In the Even-even Sr Nucleimentioning

confidence: 99%

Shape coexistence in Sr isotopes

Maya-Barbecho,

García-Ramos

2022

Preprint

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Background: Sr isotopes are located in the mass region A ≈ 100, where a very quick onset of nuclear deformation exists, being other notable examples of this area Yb, Zr, and Nb nuclei. The presence of the proton subshell closure Z = 40 allows the existence of particle-hole excitations that produces low-lying intruder bands.Purpose: The goal of this work is the study of the nuclear structure of the even-even 92−102 Sr isotopes through the accurate description of excitation energies, B(E2) transition rates, nuclear radii and two-neutron separation energies. Method:The interacting boson model with configuration mixing will be the framework to calculate all the observables of the Sr isotopes. Only two types of configurations will be considered, namely, 0particle-0hole and 2particle-2hole excitations. The parameters of the model are determined using a least-squares procedure for the excitation energies and the B(E2) transition rates.Results: For the whole chain of isotopes, the value of excitation energies, B(E2)'s, two-neutron separation energies, nuclear radii, and isotope shifts have been obtained, with a good agreement between theory and experiment. Also, a detailed analysis of the wave functions have been performed and, finally, the mean-field energy surfaces and the value of the nuclear deformation, β, have been obtained. Conclusions:The presence of low-lying intruder states in even-even Sr isotopes have been confirmed and its connection with the onset of deformation has been clarified. Lightest Sr isotopes present a spherical structure while the heaviest ones are clearly deformed. The rapid onset of deformation at neutron number 60 is due to the crossing of the regular and intruder configurations and, moreover, both families of states present an increase of deformation with the neutron number.

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