Shape coexistence and evolution inSr98
| Autor: | Aaron Chester, E. T. Rand, R. Krücken, K. G. Leach, K. Starosta, E. R. Tardiff, Joochun Park, S. Sjue, P. Finlay, Corina Andreoiu, P. C. Bender, G. Hackman, P. E. Garrett, A. B. Garnsworthy, Baharak Hadinia, G. C. Ball, C. E. Svensson, A. Close, J. Glister |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Physical Review C. 93 |
| ISSN: | 2469-9993 2469-9985 |
| DOI: | 10.1103/physrevc.93.014315 |
| Popis: | Shape coexistence between the strongly deformed ground state and the weakly deformed ${0}_{2}^{+}$ state in $^{98}\mathrm{Sr}$ has been a major topic of interest due to the energy difference of 215 keV, which is the smallest in all even-even nuclei. The electric monopole transition strength ${\ensuremath{\rho}}^{2}(E0)$ is an important quantity that can relate the deformation difference and the shape mixing between the two ${0}^{+}$ states, which are admixtures of the vibrational (S) and the rotational (D) states in a simple mixing model. In a $\ensuremath{\beta}$-decay spectroscopy experiment, the experimental ${\ensuremath{\rho}}^{2}(E0)$ was measured. A value of 0.053(5) is consistent with the previous measurement and was combined with known electric quadrupole transition strengths $B(E2)$ in calculations of a two-state mixing model. Based on a systematic study on neighboring Kr, Zr, and Mo isotopes, the mixing of the ${0}^{+}$ and ${2}^{+}$ states in $^{98}\mathrm{Sr}$ was determined to be 8.6% and 1.3%, respectively, corresponding to deformation parameters ${\ensuremath{\beta}}_{\text{D}}=0.38(1)$ and ${\ensuremath{\beta}}_{\text{S}}=\ensuremath{-}0.23(2)$. These parameters reproduce experimental transition strengths well except for the ${4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+}$ transition, which suggests a smaller D-band deformation for $J\ensuremath{\ge}4$. |
| Databáze: | OpenAIRE |
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