Eur. Phys. J. A (2020) 56: 263
https://doi.org/10.1140/epja/s10050-020-00271-0

Letter to the Editor

Important Influence of Entrance Channel Reorientation Coupling on Proton Stripping

¹ National Centre for Nuclear Research, ul. Andrzeja Sołtana 7, 05-400, Otwock, Poland
² Department of Physics, Florida State University, Tallahassee, Florida, 32306, USA
³ Heavy Ion Laboratory, University of Warsaw, ul. Pasteura 5a, 02-093, Warsaw, Poland

^* e-mail: nicholas.keeley@ncbj.gov.pl

Received: 19 August 2020
Accepted: 2 October 2020
Published online: 16 October 2020

Abstract

While 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 $$^{208}\hbox {Pb}(^7\hbox {Li},^6\hbox {He})^{209}\hbox {Bi}$$ proton stripping reaction at an incident energy of 52 MeV can be well described by the inclusion of the $$^7\hbox {Li}$$ 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 $$1/2^-$$ excited state of $$^7\hbox {Li}$$, 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 $$13/2^+$$ level of $$^{209}\hbox {Bi}$$ which is significantly improved) but does affect appreciably the values of the $$^{209}\mathrm {Bi} \rightarrow {^{208}\mathrm {Pb}} + p$$ spectroscopic factors. Implications for experiments with weakly-bound light radioactive beams are discussed.