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Title: Effect of breakup on elastic scattering for the {sup 6,7}Li+{sup 59}Co systems

Abstract

The elastic scattering for the {sup 6,7}Li+{sup 59}Co systems was investigated in the bombarding energy range 12 MeV{<=}E{sub lab}{<=}30 MeV by means of an analysis using the Sao Paulo potential, through which the behavior of the real and imaginary parts as function of the bombarding energy was established. The experimental results suggest that overall there is an evidence of the usual threshold anomaly for both systems, although for the {sup 6}Li+{sup 59}Co system, an evidence of the breakup threshold anomaly could also be questioned.

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2]
  1. Instituto de Fisica, Universidade de Sao Paulo, Departamento de Fisica Nuclear, Laboratorio Pelletron, Caixa Postal 66318, 05315-970, Sao Paulo, SP (Brazil)
  2. (Brazil)
Publication Date:
OSTI Identifier:
20995210
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.75.044601; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COBALT 59; ELASTIC SCATTERING; HEAVY IONS; LITHIUM 6; LITHIUM 7; MASS NUMBER; MEV RANGE 10-100

Citation Formats

Souza, F. A., Leal, L. A. S., Carlin, N., Munhoz, M. G., Neto, R. Liguori, Moura, M. M. de, Suaide, A. A. P., Szanto, E. M., Toledo, A. Szanto de, Takahashi, J., and Instituto de Fisica Gleb Wataghin, Universidade estadual de Campinas, Caixa Postal 6165, 13084-971, Campinas, SP. Effect of breakup on elastic scattering for the {sup 6,7}Li+{sup 59}Co systems. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.044601.
Souza, F. A., Leal, L. A. S., Carlin, N., Munhoz, M. G., Neto, R. Liguori, Moura, M. M. de, Suaide, A. A. P., Szanto, E. M., Toledo, A. Szanto de, Takahashi, J., & Instituto de Fisica Gleb Wataghin, Universidade estadual de Campinas, Caixa Postal 6165, 13084-971, Campinas, SP. Effect of breakup on elastic scattering for the {sup 6,7}Li+{sup 59}Co systems. United States. doi:10.1103/PHYSREVC.75.044601.
Souza, F. A., Leal, L. A. S., Carlin, N., Munhoz, M. G., Neto, R. Liguori, Moura, M. M. de, Suaide, A. A. P., Szanto, E. M., Toledo, A. Szanto de, Takahashi, J., and Instituto de Fisica Gleb Wataghin, Universidade estadual de Campinas, Caixa Postal 6165, 13084-971, Campinas, SP. Sun . "Effect of breakup on elastic scattering for the {sup 6,7}Li+{sup 59}Co systems". United States. doi:10.1103/PHYSREVC.75.044601.
@article{osti_20995210,
title = {Effect of breakup on elastic scattering for the {sup 6,7}Li+{sup 59}Co systems},
author = {Souza, F. A. and Leal, L. A. S. and Carlin, N. and Munhoz, M. G. and Neto, R. Liguori and Moura, M. M. de and Suaide, A. A. P. and Szanto, E. M. and Toledo, A. Szanto de and Takahashi, J. and Instituto de Fisica Gleb Wataghin, Universidade estadual de Campinas, Caixa Postal 6165, 13084-971, Campinas, SP},
abstractNote = {The elastic scattering for the {sup 6,7}Li+{sup 59}Co systems was investigated in the bombarding energy range 12 MeV{<=}E{sub lab}{<=}30 MeV by means of an analysis using the Sao Paulo potential, through which the behavior of the real and imaginary parts as function of the bombarding energy was established. The experimental results suggest that overall there is an evidence of the usual threshold anomaly for both systems, although for the {sup 6}Li+{sup 59}Co system, an evidence of the breakup threshold anomaly could also be questioned.},
doi = {10.1103/PHYSREVC.75.044601},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}
  • No abstract prepared.
  • Excitation functions of quasi-elastic scattering at backward angles have been measured for the {sup 6,7}Li+{sup 144}Sm systems at near-barrier energies, and fusion barrier distributions have been extracted from the first derivatives of the experimental cross sections with respect to the bombarding energies. The data have been analyzed in the framework of continuum discretized coupled-channel calculations, and the results have been obtained in terms of the influence exerted by the inclusion of different reaction channels, with emphasis on the role played by the projectile breakup.
  • In the present work, results of measurements of quasi-elastic scattering cross sections using a silicon-telescope detector at backward angles are reported. They allowed us to deduce fusion barrier distributions from the first derivative of the corresponding excitation function (-d(d{sigma}{sub qes}/d{sigma}{sub Rut})/dE). We report data for the systems {sup 6,7}Li on {sup 144}Sm which are characterized by loosely bound projectiles onto a closed neutron shell target. The experimental excitation functions and the associated barrier distributions are compared for both systems.
  • The breakup of the projectile-like nuclei in reactions induced by 30 MeV {sup 6}Li and {sup 7}Li beams on a {sup 144}Sm target have been measured through the coincident detection of the in-plane emitted light particles. The primary ion that undergoes breakup has been identified and the physically meaningful variables that characterize the reaction have been obtained on a purely experimental basis. Distributions have been obtained for both the binary emission angle and for the breakup emission angle in the reference frame of the breakup products.
  • Elastic scattering of 50 MeV ..pi../sup +/ projectiles from targets of /sup 6,7/Li and /sup 12,13/C has been studied. Effects due to isotopic differences between targets are clearly visible in the data. The results are compared to three model descriptions for the cross section ratios for isotope pairs; in the case of /sup 12/C-/sup 13/C a simple core-plus-valence-neutron model works well for /sup 13/C if the core (/sup 12/C) potential describes observed /sup 12/C elastic scattering. Such a model does not work for the /sup 6/Li-/sup 7/Li ratio due to improper treatment of the scattering process and the quadrupole momentsmore » of the Li ground states.« less