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Fine Structure in the alpha decays of 226U and 230Pu |
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| Authors: | PT Greenlees P Kuusiniemi N Amzal A Andreyev PA Butler KJ Cann JFC Cocks O Dorvaux T Enqvist P Fallon B Gall M Guttormsen D Hawcroft K Helariutta FP Hessberger F Hoellinger GD Jones P Jones R Julin S Juutinen H Kankaanpää H Kettunen M Leino S Messelt M Muikku S Ødegård RD Page A Savelius A Schiller S Siem WH Trzaska T Tveter J Uusitalo |
| Institution: | (1) Department of Physics, University of Jyväskylä, P.O.B. 35 (JYFL), 40351 Jyväskylä, Finland; |
| Abstract: | The nuclei 226U and 230Pu have been populated via reactions involving 208Pb targets bombarded by 22Ne and 26Mg projectiles. Fusion-evaporation residues were separated in-flight using a gas-filled recoil separator. A position-sensitive Si-strip detector was employed at the focal plane in order to identify correlated !-decay chains. Two fine structure !-decay lines have been observed. The first, with an energy of 7385(5) keV, is assigned as the ! decay from 226U to the first excited 2+ state of 222Th. The second line, observed for the first time in this work, has an energy of 6961(30) keV and is assigned as the ! decay from 230Pu to the first excited 2+ state of 226U. The excitation energy of the first excited 2+ state in 226U was determined to be 96(25) keV, giving an estimate of the deformation parameter #2 0.20. |
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