Observation of a Core-Excited E4 Isomer in 98Cd

Observation of a Core-Excited E4 Isomer in 98Cd
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98Cd 中核心激发 E4 异构体的观察

DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
W. Wolski
W. Wolski
中科院分区：
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文献类型：
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作者：
A. Blazhev;M. Górska;H. Grawe;J. Nyberg;M. Palacz;E. Caurier;O. Dorvaux;A. Gadea;F. Nowacki;C. Andreoiu;G. Angelis;D. Balabanski;C. Beck;B. Cederwall;D. Curien;J. Döring;J. Ekman;C. Fahlander;K. Lagergren;J. Ljungvall;M. Moszynski;L. Norlin;C. Plettner;D. Rudolph;D. Sohler;K. Spohr;O. Thelen;M. Weiszflog;M. Wisell;M. Wolińska;W. Wolski

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在第四届欧洲杯上的一次实验中，在98Cd中发现了一种核激发的I=(12+)自旋能隙异构体。它被发现通过E4跃迁提供了已知的I=(8+)优先异构体。在Ex=6635keV和2428keV时，测得S和S的半衰期分别为0.23和0.17微米。从核激发异构体的激发能推算出100Sn壳间隙为6.46(15)MeV。在大规模壳模型计算的框架内，讨论了测量的E4和E2强度、100Sn核激发和经验极化电荷的来源。发现e&lt；0.4e的质子有一个E_2极化电荷，对应于纯质子空穴价态空间中的经验值e=0.45()e。
A core-excited I = (12+) spin-gap isomer was identified in 98Cd in an experiment at EUROBALL IV. It was found to feed the known I = (8+) seniority isomer by an E4 transition. Half-lives of T1/2 = 0.23() µs and 0.17() µs were measured for the two states at Ex = 6635 keV and 2428 keV, respectively. From the excitation energy of the core-excited isomer a 100Sn shell gap of 6.46(15) MeV is inferred. The measured E4 and E2 strengths, 100Sn core excitations and the origin of empirical polarization charges are discussed in the framework of large-scale shell model calculations. An E2 polarization charge for protons of e<0.4 e is found, which corresponds to the empirical value e = 0.45() e in the pure proton hole valence space.