Important Influence of Entrance Channel Reorientation Coupling on Proton Stripping

Abstract

AbstractWhile it is well established that the ground state reorientation coupling can have a significant influence on the elastic scattering of deformed nuclei, the effect of such couplings on transfer channels has been much less well investigated. In this letter we demonstrate that the $$^{208}\hbox {Pb}(^7\hbox {Li},^6\hbox {He})^{209}\hbox {Bi}$$ 208 Pb ( 7 Li , 6 He ) 209 Bi proton stripping reaction at an incident energy of 52 MeV can be well described by the inclusion of the $$^7\hbox {Li}$$ 7 Li ground state reorientation coupling within the coupled channels Born approximation formalism. Full finite-range distorted wave Born approximation calculations were previously found to be unable to describe these data. Addition of coupling to the 0.478-MeV $$1/2^-$$ 1 / 2 - excited state of $$^7\hbox {Li}$$ 7 Li , together with the associated two-step transfer path, has little or no influence on the shape of the angular distributions (except that for stripping leading to the 1.61-MeV $$13/2^+$$ 13 / 2 + level of $$^{209}\hbox {Bi}$$ 209 Bi which is significantly improved) but does affect appreciably the values of the $$^{209}\mathrm {Bi} \rightarrow {^{208}\mathrm {Pb}} + p$$ 209 Bi → 208 Pb + p spectroscopic factors. Implications for experiments with weakly-bound light radioactive beams are discussed.