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Title: 14O+p elastic scattering in a microscopic cluster model

Abstract

The 14O+p elastic scattering is analyzed in a fully microscopic cluster model. With the Resonating Group Method associated with the microscopic R-matrix theory, phase shifts and cross sections are calculated. Data on 16O+p are used to test the precision of the model. For the 14O+p elastic scattering, an excellent agreement is found with recent experimental data. Resonances properties in 15F are discussed.

Authors:
 [1];  [2];  [3];  [2]
  1. Physique Nucleaire Theorique et Physique Mathematique, C.P.229, Universite Libre de Bruxelles, B 1050 Brussels (Belgium)
  2. Physique Quantique, C.P. 165/82, Universite Libre de Bruxelles, B 1050 Brussels (Belgium)
  3. (Belgium)
Publication Date:
OSTI Identifier:
20798537
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 831; Journal Issue: 1; Conference: International conference on frontiers in nuclear structure, astrophysics, and reactions - FINUSTAR, Isle of Kos (Greece), 12-17 Sep 2005; Other Information: DOI: 10.1063/1.2200930; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCURACY; CLUSTER MODEL; CROSS SECTIONS; ELASTIC SCATTERING; FLUORINE 15; OXYGEN 14; OXYGEN 16; PHASE SHIFT; PROTON-NUCLEON INTERACTIONS; R MATRIX; RESONANCE; RESONATING-GROUP METHOD

Citation Formats

Descouvemont, P., Baye, D., Physique Nucleaire Theorique et Physique Mathematique, C.P.229, Universite Libre de Bruxelles, B 1050 Brussels, and Leo, F. 14O+p elastic scattering in a microscopic cluster model. United States: N. p., 2006. Web. doi:10.1063/1.2200930.
Descouvemont, P., Baye, D., Physique Nucleaire Theorique et Physique Mathematique, C.P.229, Universite Libre de Bruxelles, B 1050 Brussels, & Leo, F. 14O+p elastic scattering in a microscopic cluster model. United States. doi:10.1063/1.2200930.
Descouvemont, P., Baye, D., Physique Nucleaire Theorique et Physique Mathematique, C.P.229, Universite Libre de Bruxelles, B 1050 Brussels, and Leo, F. Wed . "14O+p elastic scattering in a microscopic cluster model". United States. doi:10.1063/1.2200930.
@article{osti_20798537,
title = {14O+p elastic scattering in a microscopic cluster model},
author = {Descouvemont, P. and Baye, D. and Physique Nucleaire Theorique et Physique Mathematique, C.P.229, Universite Libre de Bruxelles, B 1050 Brussels and Leo, F.},
abstractNote = {The 14O+p elastic scattering is analyzed in a fully microscopic cluster model. With the Resonating Group Method associated with the microscopic R-matrix theory, phase shifts and cross sections are calculated. Data on 16O+p are used to test the precision of the model. For the 14O+p elastic scattering, an excellent agreement is found with recent experimental data. Resonances properties in 15F are discussed.},
doi = {10.1063/1.2200930},
journal = {AIP Conference Proceedings},
number = 1,
volume = 831,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2006},
month = {Wed Apr 26 00:00:00 EDT 2006}
}
  • The {sup 14}O+p elastic scattering is discussed in detail in a fully microscopic cluster model. The {sup 14}O cluster is described by a closed p shell for protons and a closed p3/2 subshell for neutrons in the translation-invariant harmonic-oscillator model. The exchange and spin-orbit parameters of the effective forces are tuned on the energy levels of the {sup 15}C mirror system. With the generator-coordinate and microscopic R-matrix methods, phase shifts and cross sections are calculated for the {sup 14}O+p elastic scattering. An excellent agreement is found with recent experimental data. A comparison is performed with phenomenological R-matrix fits. Resonances propertiesmore » in {sup 15}F are discussed.« less
  • An effective nucleon-nucleon interaction adapted to cluster-model calculations of collisions is derived from the realistic Argonne potential AV18 with the unitary correlation operator method. The unitary correlation is determined from the {alpha}+{alpha} elastic phase shifts calculated in a cluster approach by the generator coordinate method coupled with the microscopic R-matrix method. With this interaction, the elastic phase shifts for the {alpha}+n, {alpha}+p, and {alpha}+{sup 3}He collisions are calculated within the same model. Without further adjustment, a good agreement with experimental data is obtained with a small model space.
  • We calculate the {sup 3}He+p scattering phase shifts for the S and P waves in a microscopic cluster model, in which the description of the {sup 3}He wave function is extended from a simple (0s){sup 3} model to a three-body model. We employ two different nucleon-nucleon interactions, the Minnesota (MN) and AV8{sup '} potentials, to investigate the role of the d+2p channel in the low-energy phase shifts. The role of the d+2p channel in the P-wave phase shifts is very sensitive to the choice of the potential. The d+2p channel is indispensable in reproducing the resonant phase shifts in themore » AV8{sup '} potential while it plays a minor role in the MN potential. On the contrary, the role of this channel in the S-wave nonresonant phase shifts is negligible in both potentials.« less
  • The 14O( ,p)17F reaction is an important trigger reaction leading to the p process in x-ray bursts. The inclusion of reaction channels populating excited 17F levels may significantly increase the calculated 14O( ,p)17F reaction rate. A radioactive 17F beam was used at the Oak Ridge National Laboratory Holifield Radioactive Ion Beam Facility to search for a 18Ne resonance at Ec.m.(17F + p) 3.1MeV that had been previously suggested to decay strongly to the first excited level in 17F. No evidence, however, of inelastic 17F + p scattering was observed at this energy, and an upper limit of 10 mb hasmore » been set on the inelastic-scattering cross section.« less
  • {sup 11}Li+p elastic scattering data at three energies, 62, 68.4, and 75 MeV/nucleon, are analyzed with density-dependent M3Y and KH effective nucleon-nucleon (NN) interactions in the framework of the single folding model. The parameters of the density-dependent term are adjusted to fulfill saturation of nuclear matter. The optical potentials (OP's) and cross sections are calculated using four model densities of {sup 11}Li, G (one-parameter Gaussian), GG (Gaussian-Gaussian), GO (Gaussian- oscillator), and the COSMA (cluster orbital shell model approximation). Comparative studies are performed for real, imaginary, and spin-orbit potentials with the phenomenological and microscopic forms. The microscopic volume and surface imaginarymore » potentials are constructed from both the renormalized folded potentials and their derivatives. The sensitivity of the differential cross section to the four densities is tested. It is found that the {sup 11}Li+p elastic scattering cross sections depend strongly upon the behavior of the corresponding potentials. The GG and GO densities obtained from analyzing the data, using Glauber multiple scattering theory at high energies, give good results at energies below 100 MeV/nucleon in the framework of the folding model. The OP's calculated in the microscopic form using few parameters give good agreement with the data. Thus, it is not necessary to introduce a large number of arbitrary fitting parameters as done in the phenomenological and semimicroscopic OP's. The KH effective interaction successfully describes {sup 11}Li+p elastic scattering as the popular M3Y interaction. The obtained results of the reaction cross section are in good agreement with previous calculations.« less