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

doi:10.1016/0375-9474(89)90148-6

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

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	557-567
Number of pages	11
Journal	Nuclear Physics, Section A
Volume	501
Issue number	3
DOIs	https://doi.org/10.1016/0375-9474(89)90148-6
Publication status	Published - Sep 25 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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title = "Alpha decays of 221Pa and 218,219Ac",

abstract = "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.",

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

year = "1989",

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doi = "10.1016/0375-9474(89)90148-6",

language = "English",

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journal = "Nuclear Physics A",

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T1 - Alpha decays of 221Pa and 218,219Ac

AU - Miyatake, H.

AU - Nomura, T.

AU - Kubono, S.

AU - Tanaka, J.

AU - Oyaizu, M.

AU - Okawa, H.

AU - Ikeda, Nobuo

AU - Sueki, K.

AU - Kudo, H.

AU - Morita, Kosuke

AU - Shinozuka, T.

PY - 1989/9/25

Y1 - 1989/9/25

N2 - 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.

AB - 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.

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JO - Nuclear Physics A

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