α-decays of neutron-deficient americium isotopes

M. Sakama, M. Asai, K. Tsukada, S. Ichikawa, I. Nishinaka, Y. Nagame, H. Haba, S. Goto, M. Shibata, K. Kawade, Y. Kojima, Y. Oura, M. Ebihara, H. Nakahara

研究成果: Article査読

16 被引用数 (Scopus)

抄録

Neutron-deficient americium isotopes 233,234,235,236Am were produced in the bombardment of multiple thin targets of 233U and 235U with 7.6-10.5 MeV/nucleon 6Li ions. The reaction products were effectively mass-separated using the on-line isotope separator (JAERI-ISOL) coupled to a helium gas-jet transport system. For the first time, the α transition of 235Am was observed, and some improved α-decay data for 233,234,236Am and229Np (α-decay daughter of 233Am) were accumulated. The α-particle energies of 233Am and 235Am were determined to be 6780±17 keV and 6457±14 keV and their half-lives were 3.2±0.8 min and 10.3±0.6 min, respectively. Measured α-decay branching ratios of 235Am and 229Np were (4.0±0.5) × 10-3 and 0.68±0.11, respectively, while the lower limit for α-decay of 233Am was deduced to be 3 × 10-2. Hindrance factors and probable assignments of the levels involved in those α transitions are discussed.

本文言語English
論文番号014308
ページ(範囲)143081-1430811
ページ数1287731
ジャーナルPhysical Review C - Nuclear Physics
69
1
出版ステータスPublished - 2004 1
外部発表はい

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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