Properties of Radioactive Decay of the New Nucleus 227Pu

A. A. Kuznetsova, A. I. Svirikhin, A. V. Isaev, M. A. Bychkov, V. D. Danilkin, H. M. Devaraja, N. I. Zamyatin, I. N. Izosimov, Zhong Liu, O. N. Malyshev

12 more authors

R. S. Mukhin, A. G. Popeko, Yu. A. Popov, V. A. Rachkov, Bekzat Sailaubekov, Evgeny A. Sokol, M. S. Tezekbayeva, I. I. Ulanova, Zhang Feng-Shou, Victor I. Chepigin, Maxim L. Chelnokov, Alexander V. Yeremin

2025

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DOI 10.1134/s1547477124702510

Data confidence 70 medium

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Abstract

A new isotope 227Pu was discovered by complete fusion reactions 26Mg + 204Pb and 26Mg + 206Pb. The experiment was carried out at the GRAND separator of the SHE Factory at Flerov Laboratory of Nuclear Reactions, JINR. For the nucleus 227Pu, an α-particle energy of Eα = 8156 ± 26 keV and a half-life of Т1/2 = $$2.2_{{ - 0.3}}^{{ + 0.5}}$$ s were measured. A single event with Eα = 8754 ± 24 keV and an estimated lower limit half-life of 1 ms from the measured lifetime, which is probably attributed to the new isotope 226Pu, was identified by chain with 222U.