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Chinese Physics C> 2002, Vol. 26> Issue(8) : 797-802 

(EC+β+) Decay of 133Sm and 1.1s Isomer of 133Pr

  •  Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China

  • By irradiation of an enriched target of 96Ru with 40Ca and using a helium-jet fast tape transport system in combination with X-γ and γ-γ coincidence measurements,the very neutron deficient isotope 133Sm was produced and studied. A simple(EC+β+) decay scheme of Sm is proposed for the first time. A by product 133Pr was produced simultaneously because of the 98－102Ru contents of the ruthenium target. The half-life of an 11/2－ low-lying isomeric state in 133Pr has been measured to be (1.1±0.2)s. Using single-particle model,the reduced transition probabilities of the 11/2－ isomers in 131,133,135,137Pr are extracted from their experimental half-lives and compared with the Weisskopf estimate.
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    [1] . Bogdanov D D, Demyanov A V, Karnaukhov V A et al. Nucl. Phys.,1977,A275:229—236 2. Wilmarth P, Nitschke J M, Lemmertz P K et al.,Z. Phys.1985,A321:179—180 3. Rab S. Nucl Data Sheets,1995,75:6564. Breitenbach J, Braga R A, Wood J L et al. Deformation Studies in the Extremely Neutron-Deficient Praseodymium, Neodymium and Promethium Isotopes. In:Ed. R Neugart, A Wohr. Nuclei Far From Stability and the Atomic Masses and Fundamental Constants1992:The Proceedings of the 6th International Conference on Nuclei Far From Stability and the 9th International Conference on Atomic Masses and Fundamental Constants, held in Mainz, Germany,19—24 July 1992(Institute of Physics Conference Series 132).Bristol, UK :IOP Publishing Ltd,1993,575—5805. Genevey J, Gizon A, Foin C et al. Nucl. Phys.,1996,A611:247—2696. Hildingsson L, Beausang C W et al. Phys. Rev.,1988,C37(3):985—997 7. Liang C F, Paris P, Bucurescu D et al. Phys. Rev.,1989,C40:2796—2803 8. Regan P H, Wadsworth R, Hughes J R et al. Nucl. Phys.,1991,A533:476—504 9. Morinaga H, Yamazaki T. In-Beam Gamma-ray Spectroscopy. Amsterdam New York Oxford:North-Holland Publishing Company,1976.65—75

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WANG Xu-Dong, XIE Yuan-Xiang, XU Shu-Wei, LI Zhan-Kui, GUO Bin, LENG Chang-Geng, WANG Chun-Fang and YU Yong. (EC+β+) Decay of 133Sm and 1.1s Isomer of 133Pr[J]. Chinese Physics C, 2002, 26(8): 797-802.
WANG Xu-Dong, XIE Yuan-Xiang, XU Shu-Wei, LI Zhan-Kui, GUO Bin, LENG Chang-Geng, WANG Chun-Fang and YU Yong. (EC+β+) Decay of 133Sm and 1.1s Isomer of 133Pr[J]. Chinese Physics C, 2002, 26(8): 797-802. shu
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Received: 2001-10-26
Revised: 1900-01-01
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(EC+β+) Decay of 133Sm and 1.1s Isomer of 133Pr

    Corresponding author: WANG Xu-Dong,
  • Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China
  • Received Date: 2001-10-26
  • Accepted Date: 1900-01-01
  • Available Online: 2002-08-05

Abstract: By irradiation of an enriched target of 96Ru with 40Ca and using a helium-jet fast tape transport system in combination with X-γ and γ-γ coincidence measurements,the very neutron deficient isotope 133Sm was produced and studied. A simple(EC+β+) decay scheme of Sm is proposed for the first time. A by product 133Pr was produced simultaneously because of the 98－102Ru contents of the ruthenium target. The half-life of an 11/2－ low-lying isomeric state in 133Pr has been measured to be (1.1±0.2)s. Using single-particle model,the reduced transition probabilities of the 11/2－ isomers in 131,133,135,137Pr are extracted from their experimental half-lives and compared with the Weisskopf estimate.

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