Fine structure in proton emission from the 7/2−[523] ground state and from the 1/2+[411] isomer in deformed nucleus 141Ho was studied by means of fusion-evaporation reactions and digital signal processing. Proton transitions to the first excited 2+ state in 140Dy, with the branching ratio of Igs p (2+) = 0.9 ± 0.2% and Imp (2+) = 1.7 ± 0.5%, were observed. The data are analyzed within the non-adiabatic weak coupling model assuming a large quadrupole deformation of the daughter nucleus 140Dy as predicted by the self-consistent theory. Implications of this result on coexistence effects around N = 74 are discussed. Significant modifications of the proton shell structure when going from the valley of beta stability to the proton drip line are discussed in terms of self-consistent theory involving the two-body tensor interaction.

Shell structure beyond the proton drip line studied via proton emission from deformed 141Ho / M. Karny, K.P. Rykaczewski, R.K. Grzywacz, J.C. Batchelder, C.R. Bingham, C. Goodin, C.J. Gross, J.H. Hamilton, A. Korgul, W. Królas, S.N. Liddick, K. Li, K.H. Maier, C. Mazzocchi, A. Piechaczek, K. Rykaczewski, D. Schapira, D. Simpson, M.N. Tantawy, J.A. Winger, C.H. Yu, E.F. Zganjar, N. Nikolov, J. Dobaczewski, A.T. Kruppa, W. Nazarewicz, M.V. Stoitsov. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 664:1-2(2008), pp. 52-56.

Shell structure beyond the proton drip line studied via proton emission from deformed 141Ho

C. Mazzocchi;
2008

Abstract

Fine structure in proton emission from the 7/2−[523] ground state and from the 1/2+[411] isomer in deformed nucleus 141Ho was studied by means of fusion-evaporation reactions and digital signal processing. Proton transitions to the first excited 2+ state in 140Dy, with the branching ratio of Igs p (2+) = 0.9 ± 0.2% and Imp (2+) = 1.7 ± 0.5%, were observed. The data are analyzed within the non-adiabatic weak coupling model assuming a large quadrupole deformation of the daughter nucleus 140Dy as predicted by the self-consistent theory. Implications of this result on coexistence effects around N = 74 are discussed. Significant modifications of the proton shell structure when going from the valley of beta stability to the proton drip line are discussed in terms of self-consistent theory involving the two-body tensor interaction.
Proton radioactivity; Proton shell structure; Two-body tensor interactions
2008
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/42027
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