Scattering of the Halo Nucleus Be-11 on Au-197 at Energies around the Coulomb Barrier

作者：Pesudo V; Borge M J G; Moro A M; Lay J A; Nacher E; Gomez Camacho J; Tengblad O; Acosta L; Alcorta M; Alvarez M A G; Andreoiu C; Bender P C; Braid R; Cubero M; Di Pietro A; Fernandez Garcia J P; Figuera P; Fisichella M; Fulton B R; Garnsworthy A B; Hackman G; Hager U; Kirsebom O S; Kuhn K; Lattuada M; Marquinez Duran G; Martel I; Miller D; Moukaddam M; O' Malley P D; Perea A; Rajabali M M; Sanchez Benitez A M

来源：Physical Review Letters, 2017, 118(15): 152502.

DOI：10.1103/PhysRevLett.118.152502

Angular distributions of the elastic, inelastic, and breakup cross sections of the halo nucleus Be-11 on Au-197 were measured at energies below (E-lab = 31.9 MeV) and around (39.6 MeV) the Coulomb barrier. These three channels were unambiguously separated for the first time for reactions of Be-11 on a high-Z target at low energies. The experiment was performed at TRIUMF (Vancouver, Canada). The differential cross sections were compared with three different calculations: semiclassical, inert-core continuum-coupled-channels and continuum-coupled-channels ones with including core deformation. These results show conclusively that the elastic and inelastic differential cross sections can only be accounted for if core-excited admixtures are taken into account. The cross sections for these channels strongly depend on the B(E1) distribution in Be-11, and the reaction mechanism is sensitive to the entanglement of core and halo degrees of freedom in Be-11.

• 出版日期2017-4-12