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Early Signal of Emerging Nuclear Collectivity in Neutron-Rich ^{129}Sb.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-24 , DOI: 10.1103/physrevlett.124.032502 T J Gray 1 , J M Allmond 2 , A E Stuchbery 1 , C-H Yu 2 , C Baktash 2 , A Gargano 3 , A Galindo-Uribarri 2, 4 , D C Radford 2 , J C Batchelder 5 , J R Beene 2 , C R Bingham 2, 4 , L Coraggio 3 , A Covello 6 , M Danchev 4, 7 , C J Gross 2 , P A Hausladen 8 , N Itaco 3, 9 , W Krolas 8, 10 , J F Liang 2 , E Padilla-Rodal 8, 11 , J Pavan 8 , D W Stracener 2 , R L Varner 2
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-01-24 , DOI: 10.1103/physrevlett.124.032502 T J Gray 1 , J M Allmond 2 , A E Stuchbery 1 , C-H Yu 2 , C Baktash 2 , A Gargano 3 , A Galindo-Uribarri 2, 4 , D C Radford 2 , J C Batchelder 5 , J R Beene 2 , C R Bingham 2, 4 , L Coraggio 3 , A Covello 6 , M Danchev 4, 7 , C J Gross 2 , P A Hausladen 8 , N Itaco 3, 9 , W Krolas 8, 10 , J F Liang 2 , E Padilla-Rodal 8, 11 , J Pavan 8 , D W Stracener 2 , R L Varner 2
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Radioactive ^{129}Sb, which can be treated as a proton plus semimagic ^{128}Sn core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2^{+}⊗πg_{7/2} multiplet members and candidate πd_{5/2} state were measured. The results indicate that the total electric quadrupole strength of ^{129}Sb is a factor of 1.39(11) larger than the ^{128}Sn core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.
中文翻译：
富含中子的^ {129} Sb中新兴核集体的早期信号。
通过库仑激发研究了放射性^ {129} Sb，可以将其视为质子加半魔术^ {128} Sn核。测量了2 ^ {+}⊗πg_{7/2}多重态成员和候选πd_{5/2}状态的降低的电四极转变概率B（E2）。结果表明，^ {129} Sb的总电四极强度比^ {128} Sn核大1.39（11）倍，这与经验上成功的粒子核耦合方案的预期形成鲜明对比。用两组不同的核子-核子相互作用进行的壳模型计算表明，这种增强的集体性是由于质子-中子残余相互作用产生的波函数中的构造性四极相干性引起的，在双壳封闭附近的核上添加一个核子会产生明显的影响。增强的四极电强度是新兴的核集体的早期信号，该核集体逐渐远离壳封闭。
更新日期：2020-01-24
中文翻译：
富含中子的^ {129} Sb中新兴核集体的早期信号。
通过库仑激发研究了放射性^ {129} Sb，可以将其视为质子加半魔术^ {128} Sn核。测量了2 ^ {+}⊗πg_{7/2}多重态成员和候选πd_{5/2}状态的降低的电四极转变概率B（E2）。结果表明，^ {129} Sb的总电四极强度比^ {128} Sn核大1.39（11）倍，这与经验上成功的粒子核耦合方案的预期形成鲜明对比。用两组不同的核子-核子相互作用进行的壳模型计算表明，这种增强的集体性是由于质子-中子残余相互作用产生的波函数中的构造性四极相干性引起的，在双壳封闭附近的核上添加一个核子会产生明显的影响。增强的四极电强度是新兴的核集体的早期信号，该核集体逐渐远离壳封闭。
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