Four-body effects on 9Be+208Pb scattering and fusion around the Coulomb barrier

NUBA Conference Series -1: Nuclear Physics and Astrophysics

物理学;天文学

Descouvemont, P.^1 ; Druet, T.^1 ; Canto, L.F.^2,3 ; Hussein, M.S.^4,5,6

Physique Nucléaire Théorique et Physique Mathématique, Université Libre de Bruxelles (ULB), C.P. 229, Brussels

B 1050, Belgium^1

Instituto de Física, Universidade Federal Do Rio de Janeiro, C.P. 68528, Rio de Janeiro, RJ

21941-972, Brazil^2

Instituto de Fsica, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, Niteri, RJ, Brazil^3

Departamento de Física Matemática, Instituto de Física, Universidade de São Paulo, C.P. 66318, São Paulo, SP

05314-970, Brazil^4

Instituto de Estudos Avançados, Universidade de São Paulo, C.P. 72012, São Paulo, SP

05508-970, Brazil^5

Departamento de Física, Instituto Tecnológico de Aeronáutica, CTA, São Paulo, SP, Brazil^6

关键词: Body effect;    Coulomb barrier;    Coupled channels;    Discrete numbers;    Hyperspherical coordinates;    Optical potential;    Parameter fitting;    Pseudo-states;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/590/1/012008/pdf
DOI  :  10.1088/1742-6596/590/1/012008

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We investigate the9Be+208Pb elastic scattering and fusion at energies around the Coulomb barrier. The9Be nucleus is described in α + α + n three-body model, using the hyperspherical coordinate method. The scattering with208Pb is then studied with the Continuum Discretized Coupled Channel (CDCC) method, where the α + α + n continuum is approximated by a discrete number of pseudostates. Optical potentials for the α+208Pb and n+208Pb systems are taken from the literature. We present elastic-scattering and fusion cross sections at different energies, and investigate the convergence with respect to the truncation of the α + α + n continuum. A good agreement with experiment is obtained, considering that there is no parameter fitting. We show that continuum effects increase at low energies.