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

• Published in: Physics letters. B Vol. 664; no. 1-2; pp. 52 - 56
• Main Authors: Karny, M., Rykaczewski, K.P., Grzywacz, R.K., Batchelder, J.C., Bingham, C.R., Goodin, C., Gross, C.J., Hamilton, J.H., Korgul, A., Królas, W., Liddick, S.N., Li, K., Maier, K.H., Mazzocchi, C., Piechaczek, A., Rykaczewski, K., Schapira, D., Simpson, D., Tantawy, M.N., Winger, J.A., Yu, C.H., Zganjar, E.F., Nikolov, N., Dobaczewski, J., Kruppa, A.T., Nazarewicz, W., Stoitsov, M.V.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-06-2008; Elsevier Science
• Subjects: Exact sciences and technology; Nuclear physics; Physics; Proton radioactivity; Proton shell structure; The physics of elementary particles and fields; Two-body tensor interactions; Proton radioactivity; Two-body tensor interactions; 27.60.+j; 21.10.Pc; 24.10.Eq; 23.50.+z; Proton shell structure; Protons; Deformed nuclei; Deformation; Ground states; Evaporation; Excited states; Isomers; Quadrupoles; Fine structure; Branching ratio; Weak coupling; Two body system; Signal processing; Models
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2008.04.056

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 Ipgs(2+)=0.9±0.2% and Ipm(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.