Quenching of single-particle strength inferred from nucleon-removal transfer reactions on 15 C

Le résumé fourni par la source

The difference in the proton and neutron separation energies ( Δ S ) of the weakly bound 15 C ground state is -19.86 MeV, an extreme value. Data from intermediate-energy heavy-ion induced (HI-induced) knockout reactions on nuclei spanning − 20 ≲ Δ S ≲ + 20 MeV, suggest that the degree to which single-particle strength is quenched, R s , has a negative correlation with Δ S , decreasing from unity around − 20 MeV to around 0.2 at + 20 MeV. For the 15 C ground state ( R s = 0.96 ( 4 ) in HI-induced knockout), contrasting results have recently been obtained via the neutron-adding transfer reaction, which reveal a value of R s = 0.64 ( 15 ) , similar to the value observed at modest Δ S and more extreme values of Δ S with reaction probes other than HI knockout. In order to explore the any potential differences between a d d i n g and r e m o v i n g processes in transfer reactions at extreme Δ S , single-neutron removal transfer reactions on 15 C were performed at 7.1 MeV/u in inverse kinematics. The removal of a valence neutron in 2 s 1 / 2 orbit using both ( p , d ) and ( d , t ) reactions shows consistent quenching factors and agrees with those from the neutron-adding reaction. The present results, which can be compared with neutron knockout reaction, suggest that correlations, represented by the quenching factor, show limited dependence on neutron-proton asymmetry under the most extreme asymmetry conditions so far achieved in transfer reactions.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.