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Shape coexistence and evolution in Sr-98

机译：SR-98的形状共存和演变

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摘要

Shape coexistence between the strongly deformed ground state and the weakly deformed 0(2)(+) state in Sr-98 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 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 beta-decay spectroscopy experiment, the experimental beta(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 Sr-98 was determined to be 8.6% and 1.3%, respectively, corresponding to deformation parameters beta(D) = 0.38(1) and beta(S) = -0.23(2). These parameters reproduce experimental transition strengths well except for the 4(1)(+) -> 2(1)(+) transition, which suggests a smaller D-band deformation for J >= 4.
机译：在SR-98中强烈变形的地面和弱变形的0（+）状态之间的形状共存是由于215 kev的能量差异，这是感兴趣的主要议题，这是所有偶核的最小。电动单极转变强度Rho（2）（E0）是一种重要的量，可以涉及两个0（+）状态之间的变形差和形状混合，这是振动和旋转（D）的混合在一个简单的混合模型中。在β衰减光谱实验中，测量实验β（2）（E0）。值0.053（5）与先前的测量一致，并与已知的电动四极转变强度B（E2）组合在两个状态混合模型的计算中。基于对相邻KR，Zr和Mo同位素的系统研究，SR-98中的0（+）和2（+）态的混合分别为8.6％和1.3％，对应于变形参数β （d）= 0.38（1）和β（S）= -0.23（2）。除了4（1）（+） - > 2（1）（+）转换之外，这些参数良好地再现实验过渡强度，这表明J> = 4的较小的D波段变形。

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  • 来源
    《Physical review, C》 |2016年第1期|共6页
  • 作者

    Park J.; Garnsworthy A. B.; Kruecken R.; Andreoiu C.; Ball G. C.; Bender P. C.; Chester A.; Close A.; Finlay P.; Garrett P. E.; Glister J.; Hackman G.; Hadinia B.; Leach K. G.; Rand E. T.; Sjue S.; Starosta K.; Svensson C. E.; Tardiff E.;

  • 作者单位

    Univ British Columbia Dept Phys &

    Astron Vancouver BC V6T 1Z1 Canada;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    Univ British Columbia Dept Phys &

    Astron Vancouver BC V6T 1Z1 Canada;

    Simon Fraser Univ Dept Chem Burnaby BC V5A 1S6 Canada;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    Simon Fraser Univ Dept Chem Burnaby BC V5A 1S6 Canada;

    Simon Fraser Univ Dept Chem Burnaby BC V5A 1S6 Canada;

    Univ Guelph Dept Phys Guelph ON N1G 2W1 Canada;

    Univ Guelph Dept Phys Guelph ON N1G 2W1 Canada;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    Univ Guelph Dept Phys Guelph ON N1G 2W1 Canada;

    Univ Guelph Dept Phys Guelph ON N1G 2W1 Canada;

    Univ Guelph Dept Phys Guelph ON N1G 2W1 Canada;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

    Simon Fraser Univ Dept Chem Burnaby BC V5A 1S6 Canada;

    Univ Guelph Dept Phys Guelph ON N1G 2W1 Canada;

    TRIUMF 4004 Wesbrook Mall Vancouver BC V6T 2A3 Canada;

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  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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