SPIN-FLIP BETA- DECAY OF EVEN-EVEN DEFORMED-NUCLEI RU-110 AND RU-112

被引：26

作者：

JOKINEN, A

AYSTO, J

DENDOOVEN, P

ESKOLA, K

JANAS, Z

JAUHO, PP

LEINO, ME

PARMONEN, JM

PENTTILA, H

RYKACZEWSKI, K

TASKINEN, P

机构：

[1] KATHOLIEKE UNIV LEUVEN,IKS,B-3001 LOUVAIN,BELGIUM

[2] UNIV HELSINKI,DEPT PHYS,SF-00170 HELSINKI 17,FINLAND

[3] UNIV WARSAW,DEPT EXPTL PHYS,PL-00681 WARSAW,POLAND

来源：

ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI | 1991年 / 340卷 / 01期

关键词：

D O I：

10.1007/BF01284476

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：

Neutron-rich nuclides Ru-110 and Ru-112 produced in symmetric fission of U-238 by 20 MeV protons have been studied at the IGISOL facility by means of beta-ray, gamma-ray and conversion electron spectroscopy. A total of 12 and 6 gamma-transitions were observed in the decays of Ru-110 and Ru-112, respectively. Multipolarities were determined for a few transitions. The beta decay half-life was determined to be 11.6 +/- 0.6 s for Ru-110 and 1.75 +/- 0.07 s for Ru-112. As a side product, a new value of 2.1 +/- 0.3 s for the beta half-life of the Rh-112 1+ state was obtained. The decay energy measured with the plastic scintillator was 2.81 +/- 0.05 MeV for Ru-110 and 4.52 +/- 0.08 MeV for Ru-112. The beta decay schemes of Ru-110 and Ru-112 isotopes indicate that the main fraction of their beta strength resides in two 0+ --> 1+ spin-flip transitions with their log f t values between 4.4 and 4.7. The decay energies and the energies of the 1+ GT states are compared with the macroscopic-microscopic model calculations. The observed GT-strengths are discussed in the framework of the deformed single-particle model.

引用

页码：21 / 28

页数：8

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