Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing
Abrupt shape transition at neutron number N=60 : B(E2) values in Sr94,96,98 from fast γ−γ timing
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中子数 N=60 处的突变形状转变：来自快速 γ−γ 定时的 Sr94,96,98 中的 B(E2) 值
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Y. Tsunoda
中科院分区：
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作者：
J. Régis;J. Jolie;N. Saed;N. Warr;M. Pfeiffer;A. Blanc;M. Jentschel;U. Köster;P. Mutti;T. Soldner;G. Simpson;F. Drouet;A. Vancraeyenest;E. Clément;O. Stézowski;C. Ur;W. Urban;P. Regan;Z. Podolyák;C. Larijani;C. Townsley;R. Carroll;E. Wilson;L. Fraile;H. Mach;V. Paziy;B. Olaizola;V. Vedia;A. Bruce;O. Roberts;J. Smith;M. Scheck;T. Kröll;A. Hartig;A. Ignatov;S. Ilieva;S. Lalkovski;W. Korten;N. Mărginean;T. Otsuka;N. Shimizu;T. Togashi;Y. Tsunoda
利用Laue-Langevin研究所的EXILL&FATIMA光谱仪，利用LaBr3（Ce）探测器，采用锗门控γ−γ快速定时技术，测量了富中子94,96,98sr的低处激发态寿命。使用冷中子诱导的235U裂变产生Sr裂变产物，并在厚靶内几乎瞬间停止。将实验B（E2）值与不截断8个质子和8个中子轨道占用数的蒙特卡罗壳层模型计算结果进行了比较，结果吻合较好。与Zr同位素相似，Sr同位素在中子数N=60附近的突然形状转变被认为是由其g9/2轨道上的多质子激发引起的。
Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N=60 is identified as being caused by many-proton excitations to its g9/2 orbit.