ISOMERIC 19+ STATE OF PIH9/2(2)I13/2VG9/2(J-2)0+ CONFIGURATION IN AT-210(85)125 AND QUESTION OF ISOSPIN DEPENDENCE IN 2-PARTICLE CORE POLARIZATION

被引:35
作者
RAHKONEN, V
BERGSTROM, I
BLOMQVIST, J
KNUUTTILA, O
RENSFELT, KG
SZTARKIER, J
WESTERBERG, K
机构
[1] Research Institute of Physics, Stockholm
[2] Physics Department, University of Jyväskylä
[3] Cyclotron Laboratory, Turku
来源
ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI | 1978年 / 284卷 / 04期
关键词
D O I
10.1007/BF01422102
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Using α-particles of energies 35-51 MeV and in-beam conversion electron and γ-spectroscopy techniques, a 4.0±1.7 μs core-excited 19+ isomeric state in210At with a g-factor of 0.737±0.025 has been observed at an excitation energy of 4027.7 keV. The 19+ state is suggested to have the {Mathematical expression} configuration with maximum alignment of the angular momenta. The total two-particle core polarization due to the h9/2 and i13/2 protons and the g9/2 neutron was found to be -68±20 keV as compared to -125±18 keV for the 29/2+ isomeric state of the {Mathematical expression} configuration in209At, which only differs by a g9/2 neutron. This observation indicates an isospin effect in the two-particle core polarization, which is also supported by recent discoveries of core-excited high-spin levels in208Bi using (d, α)-reactions. Thus in the orbits concerned, a proton-proton pair seems to have a much larger quadrupole polarization effect than a neutron-proton pair. © 1978 Springer-Verlag.
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页码:357 / 369
页数:13
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