The population of metastable states as a probe of relativistic-energy fragmentation reactions
The population of metastable states as a probe of relativistic-energy fragmentation reactions
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DOI：
10.1016/j.physletb.2013.05.033
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发表时间：
2013-06
影响因子：
4.4
通讯作者：
A. Bacelar;A. Bruce;Z. Podolyák;N. Al-Dahan;M. Gorska;S. Lalkovski;S. Pietri;M. Ricciardi;A. Algora;N. Alkhomashi;J. Benlliure;P. Boutachkov;A. Bracco;E. Calore;E. Casarejos;I. Cullen;A. Deo;P. Detistov;Z. Dombrádi;C. Domingo-Pardo;M. Doncel;F. Farinon;G. Farrelly;H. Geissel;W. Gelletly;J. Gerl;N. Goel;J. Grebosz;R. Hoischen;I. Kojouharov;N. Kurz;S. Leoni;F. Molina;D. Montanari;A. Morales;A. Musumarra;D. Napoli;R. Nicolini;C. Nociforo;A. Prochazka;W. Prokopowicz;P. Regan;B. Rubio;D. Rudolph;K. Schmidt;H. Schaffner;S. Steer;K. Steiger;P. Strmen;T. Swan;I. Szarka;J. Valiente-Dobon;S. Verma;P. Walker;H. Weick;H. Wollersheim
中科院分区：
文献类型：
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作者：
A. Bacelar;A. Bruce;Z. Podolyák;N. Al-Dahan;M. Gorska;S. Lalkovski;S. Pietri;M. Ricciardi;A. Algora;N. Alkhomashi;J. Benlliure;P. Boutachkov;A. Bracco;E. Calore;E. Casarejos;I. Cullen;A. Deo;P. Detistov;Z. Dombrádi;C. Domingo-Pardo;M. Doncel;F. Farinon;G. Farrelly;H. Geissel;W. Gelletly;J. Gerl;N. Goel;J. Grebosz;R. Hoischen;I. Kojouharov;N. Kurz;S. Leoni;F. Molina;D. Montanari;A. Morales;A. Musumarra;D. Napoli;R. Nicolini;C. Nociforo;A. Prochazka;W. Prokopowicz;P. Regan;B. Rubio;D. Rudolph;K. Schmidt;H. Schaffner;S. Steer;K. Steiger;P. Strmen;T. Swan;I. Szarka;J. Valiente-Dobon;S. Verma;P. Walker;H. Weick;H. Wollersheim
用9Be靶在GSI HelmholtzzEnum für Schwerion enschung轰击1 A GeV238U束流后，在Po84198,200,206,208，AT85208,209,210,211，Rn86210,211,212,213,214，Ra88210,211,212,214和Ac89215中测量了高自旋态的同质异能比。碎片在碎片分离器(FRS)中分离，并通过能量损失和飞行时间技术进行鉴定。它们被放置在上升的伽马射线探测器阵列的中心，并利用S半衰期在100 ns到40μ之间的异构态衰变过程中发射的伽马射线强度和高达55/2ℏ的自旋值来获得相应的异构化比。将这些数据与在磨损-烧蚀模型框架下计算的理论同分异构体比进行了比较。与预期值相比，高自旋异构体获得了较大的实验增强。
Isomeric ratios have been measured for high-spin states in Po84198,200,206,208, At85208,209,210,211, Rn86210,211,212,213,214, Fr87208,211,212,213,214, Ra88210,211,212,214,215, and Ac89215 following the projectile fragmentation of a 1 A GeV238U beam by a9Be target at GSI Helmholtzzentrum für Schwerionenforschung. The fragments were separated in the fragment separator (FRS) and identified by means of energy loss and time-of-flight techniques. They were brought to rest at the centre of the RISING gamma-ray detector array and intensities of gamma rays emitted in the decay of isomeric states with half-lives between 100 ns and 40 μs and spin values up to 55/2 ℏ were used to obtain the corresponding isomeric ratios. The data are compared to theoretical isomeric ratios calculated in the framework of the abrasion–ablation model. Large experimental enhancements are obtained for high-spin isomers in comparison to expected values.