Alpha decays of 221Pa and 218,219Ac

H. Miyatake, T. Nomura, S. Kubono, J. Tanaka, M. Oyaizu, H. Okawa, Nobuo Ikeda, K. Sueki, H. Kudo, Kosuke Morita, T. Shinozuka

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20 Citations (Scopus)


The θ-decays of neutron deficient actinium (218,219Ac) and protoactinium (221Pa) nuclides produced in the 16O-bombardment of 205TI and 209Bi have been studied using a gas-filled recoil isotope separator (GARIS). Their α-decays were detected with a large Si counter placed at a focal plane of GARIS. The α-decay energy of 221Pa has been measured for the first time to be Eα = 9.08 ± 0.03 MeV. The half-lives of 221Pa, 218Ac and 219Ac were determined more precisely than those reported previously; they are 5.9 ± 1.7, 1.06 ±0.09 and 11.8 ±1.5 μs, respectively. The present value for 219Ac is significantly different from the previous measurement. The reduced α-widths of N = 130 isotones are compared with the shell model calculations.

Original languageEnglish
Pages (from-to)557-567
Number of pages11
JournalNuclear Physics, Section A
Issue number3
Publication statusPublished - Sept 25 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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