α-decaying neutron-deficient nuclei 195g,195mAt

K. O. Lee, S. A. Shin, K. Morita, Y. H. Pu, M. G. Hies, A. Yoshida, T. Normura, Y. Tagaya, T. Motobashi, M. Kurokawa, H. Minemura, T. Uchibori

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Abstract

New neutron-deficient isotopes 195g,195mAt, which are far away from the β-stability line, have been produced in the 164Er( 36Ar,p4n) 195g,195mAt(E lab=199 MeV) reaction. The reaction products recoiling out of the 164Er (62.4% enriched) target were separated from the incident 36Ar beam by using a gas-filled-type recoil separator (GARIS) and were implanted onto a double-sided position-sensitive silicon detector (PSD) placed at the focal-plane of the GARIS after traversing a large micro-channel plate (MCP) assembly. The large-area MCP assembly was set 60.8 cm upstream from the PSD to measure the time of flight (TOF) and to roughly estimate the masses of the reaction products. A pulsed beam with a repetitive mode of 5-ms Beam-On and 5-ms Beam-Off was used. The fusion evaporation products were identified on the basis of genetic correlations in the evaporation residue-initiated α-decay chains. As a result, the new activity with a half-life of 84 -14 +20 ms and an α-energy of 7089±30 keV is assigned to the decay of the ground state of 195At ( 195gAt). Another new alpha line with a half-life of 26 -9 +31 ms and an α-energy of 7185±30 keV is assigned to the decay of an isomeric state in 195At ( 195mAt).

Original languageEnglish
Pages (from-to)578-583
Number of pages6
JournalJournal of the Korean Physical Society
Volume31
Issue number4
Publication statusPublished - Dec 1 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Lee, K. O., Shin, S. A., Morita, K., Pu, Y. H., Hies, M. G., Yoshida, A., Normura, T., Tagaya, Y., Motobashi, T., Kurokawa, M., Minemura, H., & Uchibori, T. (1997). α-decaying neutron-deficient nuclei 195g,195mAt. Journal of the Korean Physical Society, 31(4), 578-583.