? decay of the new isotope Ac-204

M. H. Huang,Z. G. Gan,Z. Y. Zhang, L. Ma,J. G. Wang,M. M. . Zhang,H. B. Yang,C. . L. Yang,X. Y. Huang,Z. Zhao,S. Y. Xu,L. X. Chen, X. J. Wen,Y. F. Niu, C. X. Yuan, Y. L. Tian,Y. S. Wang,J. Y. Wang,M. L. Liu,Y. H. Qiang, W. Q. Yang, H. B. Zhang, Z. W. Lu, S. Guo,W. X. Huang, Y. He, Z. Z. Ren,S. G. Zhou,X. H. Zhou,H. S. Xu, V. K. Utyonkov,A. A. Voinov,Yu . S. Tsyganov,A. . N. Polyakov

PHYSICS LETTERS B（2022）

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摘要

A new proton-unbound isotope 204Ac was produced in the fusion-evaporation reaction 169Tm(40Ca, 5n)204Ac and identified via the recoil-alpha correlation at the gas-filled recoiled separators SHANS2 and SHANS. The excitation function for producing 204Ac was measured and the optimal beam energy was evaluated to be 212 MeV. Nineteen ER -alpha 1 -alpha 2 -alpha 3 decay chains were observed for this isotope. Based on these chains, the alpha-particle energy and half-life of 204Ac were determined to be 7948(15) keV and 7.4+2.2 -1.4 ms, respectively. Both are consistent with the theoretical prediction. The reduced alpha-decay width was deduced to be 49+10-15 keV, which indicates a favored alpha decay for 204Ac. In addition, more precise decay properties of E alpha = 7883(15) keV and T1/2 = 7.7+2.7-1.6 ms were obtained for 205Ac. (c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.

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关键词

New isotope, Neutron-deficient, ?-particle energy, Half-life, Gas-filled recoil separator, Excitation function

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