α decay of the new isotope 204Ac

A new proton-unbound isotope 204Ac was produced in the fusion-evaporation reaction Tm(40169Ca,5n)204Ac and identified via the recoil-α correlation at the gas-filled recoiled separators SHANS2 and SHANS. The excitation function for producing 204Ac was measured and the optimal beam energy was evaluate...

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Veröffentlicht in:	Physics letters. B 2022-11, Vol.834, p.137484, Article 137484
Hauptverfasser:	Huang, M.H., Gan, Z.G., Zhang, Z.Y., Ma, L., Wang, J.G., Zhang, M.M., Yang, H.B., Yang, C.L., Huang, X.Y., Zhao, Z., Xu, S.Y., Chen, L.X., Wen, X.J., Niu, Y.F., Yuan, C.X., Tian, Y.L., Wang, Y.S., Wang, J.Y., Liu, M.L., Qiang, Y.H., Yang, W.Q., Zhang, H.B., Lu, Z.W., Guo, S., Huang, W.X., He, Y., Ren, Z.Z., Zhou, S.G., Zhou, X.H., Xu, H.S., Utyonkov, V.K., Voinov, A.A., Tsyganov, Yu.S., Polyakov, A.N.
Format:	Artikel
Sprache:	eng
Schlagworte:	Excitation function Gas-filled recoil separator Half-life Neutron-deficient New isotope α-particle energy
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	A new proton-unbound isotope 204Ac was produced in the fusion-evaporation reaction Tm(40169Ca,5n)204Ac and identified via the recoil-α 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 - α1 - α2 - α3 decay chains were observed for this isotope. Based on these chains, the α-particle energy and half-life of 204Ac were determined to be 7948(15) keV and 7.4−1.4+2.2 ms, respectively. Both are consistent with the theoretical prediction. The reduced α-decay width was deduced to be 49−15+10 keV, which indicates a favored α decay for 204Ac. In addition, more precise decay properties of Eα = 7883(15) keV and T1/2 = 7.7−1.6+2.7 ms were obtained for 205Ac.
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2022.137484