Shape coexistence and mixing of low-lying 0+ states in 96Sr
Shape coexistence and mixing of low-lying 0+ states in 96Sr
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DOI：
10.1016/j.physletb.2018.09.031
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发表时间：
2018-09
影响因子：
4.4
通讯作者：
S. Cruz;P. Bender;R. Krücken;K. Wimmer;F. Ames;C. Andreoiu;R. Austin;C. Bancroft;R. Braid;T. Bruhn;W. Catford;A. Cheeseman;A. Chester;D. Cross;C. Diget;T. Drake;A. Garnsworthy;G. Hackman;R. Kanungo;A. Knapton;W. Korten;K. Kuhn;J. Lassen;R. Laxdal;M. Marchetto;A. Matta;D. Miller;M. Moukaddam;N. Orr;N. Sachmpazidi;A. Sanetullaev;C. Svensson;N. Terpstra;C. Unsworth;P. Voss
中科院分区：
文献类型：
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作者：
S. Cruz;P. Bender;R. Krücken;K. Wimmer;F. Ames;C. Andreoiu;R. Austin;C. Bancroft;R. Braid;T. Bruhn;W. Catford;A. Cheeseman;A. Chester;D. Cross;C. Diget;T. Drake;A. Garnsworthy;G. Hackman;R. Kanungo;A. Knapton;W. Korten;K. Kuhn;J. Lassen;R. Laxdal;M. Marchetto;A. Matta;D. Miller;M. Moukaddam;N. Orr;N. Sachmpazidi;A. Sanetullaev;C. Svensson;N. Terpstra;C. Unsworth;P. Voss
摘要 96 Sr 中的低能激发 0 2, 3+ 态是整个核景观中形状共存的最突出的例子之一。在这项工作中，96 Sr 中 0 1, 2, 3+ 态的中子 [2 s 1/2] 2 含量是通过 TRIUMF-ISAC2 设施中的 d (95 Sr, p) 转移反应使用 SHARC 和 TIGRESS 阵列测定的。通过将实验角分布拟合到 DWBA 反应模型计算，分别提取 96 Sr 基态和 1229 keV 0+ 态的光谱因子 0.19 (3) 和 0.22 (3)。对异构体 0 3+ 态的 γ 衰变进行详细分析，确定光谱系数为 0.33 (13)。将实验结果与壳模型计算进行比较，壳模型计算预测 96 Sr 中激发的 0+ 态的光谱强度可以忽略不计。激发的 0 2, 3+ 态的强度也在两级混合模型中进行了分析，并且与 a 2= 0.40 (14) 的混合强度和 | 的固有变形差异一致。 Δβ|=0.31 (3)。这些结果表明 96 Sr 中三种不同构型的共存以及两个激发 0+ 态的强烈形状混合。
Abstract The low energy excited 0 2, 3+ states in 96 Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron [2 s 1/2] 2 content of the 0 1, 2, 3+ states in 96 Sr was determined by means of the d (95 Sr, p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19 (3) and 0.22 (3) were extracted for the 96 Sr ground and 1229 keV 0+ states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the γ-decay of the isomeric 0 3+ state was used to determine a spectroscopic factor of 0.33 (13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited 0+ states in 96 Sr. The strengths of the excited 0 2, 3+ states were also analyzed within a two-level mixing model and are consistent with a mixing strength of a 2= 0.40 (14) and a difference in intrinsic deformations of| Δ β|= 0.31 (3). These results suggest coexistence of three different configurations in 96 Sr and strong shape mixing of the two excited 0+ states.