Nonresonant breakup effects in→6+58

Abstract

Recently published data for the elastic scattering of 70.5 MeV polarized Li by Ni have been compared with the results of coupled-channels calculations. The diagonal and off-diagonal potentials used in the analysis were generated from phenomenological u + Ni and d + Ni optical potentials via the cluster-folding method. Examined were the effects of projectile excitation to the three low-lying T=0 resonant states and to nonresonant continuum states in the energy range 0.63 MeV -10.03 MeV, relative to the Li~o. +d breakup threshold at 1.47 MeV. In common with earlier analyses, calculations limited to the resonant excited states reproduced the data only when the interaction and coupling potentials were renormalized. However, the inclusion of the nonresonant excited states removed the need for this renormalization. Calculations including both the resonant and nonresonant states yielded a description of the differential cross section data superior to that resulting from calculations limited to the resonant states even when the latter were performed with renormalized potentials. Calculations of the tensor analyzing powers reproduced the data well and favored a near zero value for the spectroscopic amplitude of the D-state admixture in the Li ground state cluster wave function.PACS number(s): 25. 10.s, 24. 10.Eq, 24.70.+s

αbreakup of6Liand7Kelly1, Davis2, Ward3 et al. 2000Phys. Rev. CSelf Cite963640View full textAdd to dashboardCite

“…More recently, couplings to nonresonant excited states in the projectile have been shown to be just as important as couplings to resonant states ͓7,8͔. In particular, Rusek et al ͓8,9͔ have used the continuum-discretized coupled channels ͑CDCC͒ technique to demonstrate that the inclusion of nonresonant breakup permits the reproduction of 6 Li elastic scattering data using cluster-folding potentials without the introduction of renormalization factors. However, a question mark still remains over the CDCC technique as only the work of Davis et al ͓10͔, over a small angular range and at a single bombarding energy, has compared CDCC predictions with empirical breakup cross sections.…”