Fine structure in proton emission from the 7/2− ground state and from the 1/2+ 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.
|Titolo:||Shell structure beyond the proton drip line studied via proton emission from deformed 141Ho|
|Parole Chiave:||Proton radioactivity; Proton shell structure; Two-body tensor interactions|
|Data di pubblicazione:||2008|
|Digital Object Identifier (DOI):||10.1016/j.physletb.2008.04.056|
|Appare nelle tipologie:||01 - Articolo su periodico|