Disentanglement of Nuclear Medium Effects in the Optical Model Potential
- Physics Department--FCFM, University of Chile, Av. Blanco Encalada 2008, Santiago (Chile)
- Commisariat a l'Energie Atomique, Departement de Physique Theorique et Appliquee, Service de Physique Nucleaire, Boite Postale 12, F-91680 Bruyeres-le-Chatel (France)
The microscopic optical model potential for elastic hadron-nucleus scattering is usually represented as the convolution of a two-body effective interaction and the target ground-state mixed density. Traditionally, these convolutions become feasible with the use of simplifying assumptions and the use of the Brueckner-Bethe-Goldstone g-matrix approach for the effective interaction. As a consequence, nuclear medium effects are made explicit in the optical potential as spatial integrals through the bulk of the nucleus[1]. In this contribution we discuss a new and exact approach to track the manifestation of intrinsic nuclear medium effects. Indeed, by examining the structure in momentum and coordinate space of a two-body effective interaction spherically symmetric in its local coordinate, it is demonstrated that it can be expressed as the sum of two distinctive contributions. One of them is a medium-independent term and the other is functionally- and exclusively-proportional to the gradient of the reduced matrix element. As a result, the unabridged optical potential in momentum space becomes expressed as the sum of a medium-free and medium-dependent contributions. The latter depends exclusively on the variations of the effective interaction with respect to the density, being modulated by the gradient of the density ({rho}{sup '}{partial_derivative}/{partial_derivative}{rho}). This feature implies an enhancement of the intrinsic medium effects in the nuclear surface and suppression in the saturated volume. The manifestation of these features will be discussed in the context nucleon-nucleus elastic scattering at low and intermediate energies.
- OSTI ID:
- 21036042
- Journal Information:
- AIP Conference Proceedings, Vol. 947, Issue 1; Conference: 7. Latin American symposium on nuclear physics and applications, Cusco (Peru), 11-16 Jun 2007; Other Information: DOI: 10.1063/1.2813816; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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