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Title: Nuclear Astrophysics Studies with the Method of Continuum-Discretized Coupled-Channels

Abstract

The method of continuum-discretized coupled-channels (CDCC) is applied to two nuclear astrophysics studies. One is the determination of the astrophysical factor S{sub 17}(0) for the {sup 7}Be(p,gamma){sup 8}B reaction from the analysis of {sup 8}B breakup by {sup 208}Pb at 52 A MeV. We obtain S{sub 17}(0) = 20.9{sub -1.9}{sup +2.0} eV b, which is significantly larger than the previous one, S{sub 17}(0) = 18.9+-1.8 eV b, determined from an analysis with the virtual photon theory. The difference between the two values is found to be due to the contributions from nuclear breakup and higher-order processes. The other application of CDCC is the re-evaluation of the triple-alpha reaction rate by directly solving the three-body Schroedinger equation. The resonant and nonresonant processes are treated on the same footing. An accurate description of the alpha-alpha nonresonant states significantly quenches the Coulomb barrier between the first two alpha-particles and the third alpha-particle. Consequently, the alpha-alpha nonresonant continuum states give a markedly larger contribution at low temperatures than that reported in previous studies. We find an increase in triple-alpha reaction rate by 26 orders of magnitude around 10{sup 7} K compared with the rate of NACRE.

Authors:
;  [1];  [1];  [2];  [1];  [1]
  1. Department of Physics, Kyushu University, Fukuoka 812-8581 (Japan)
  2. Department of Physics, Chiba-Keizai College, Chiba 263-0021 (Japan)
Publication Date:
OSTI Identifier:
21362019
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1235; Journal Issue: 1; Conference: 7. Japan-China joint nuclear physics symposium, Tsukuba (Japan), 9-13 Nov 2009; Other Information: DOI: 10.1063/1.3442599; (c) 2010 American Institute of Physics; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; ASTROPHYSICS; BERYLLIUM 7 TARGET; BORON 8; BREAKUP REACTIONS; COULOMB FIELD; COUPLED CHANNEL THEORY; LEAD 208; PHOTONS; PROTON REACTIONS; REACTION KINETICS; SCHROEDINGER EQUATION; THREE-BODY PROBLEM; BARYON REACTIONS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; BORON ISOTOPES; BOSONS; CHARGED PARTICLES; CHARGED-PARTICLE REACTIONS; DIFFERENTIAL EQUATIONS; ELECTRIC FIELDS; ELEMENTARY PARTICLES; EQUATIONS; EVEN-EVEN NUCLEI; HADRON REACTIONS; HEAVY NUCLEI; IONIZING RADIATIONS; ISOTOPES; KINETICS; LEAD ISOTOPES; LIGHT NUCLEI; MANY-BODY PROBLEM; MASSLESS PARTICLES; MILLISECONDS LIVING RADIOISOTOPES; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; ODD-ODD NUCLEI; PARTIAL DIFFERENTIAL EQUATIONS; PHYSICS; RADIATIONS; RADIOISOTOPES; STABLE ISOTOPES; TARGETS; WAVE EQUATIONS

Citation Formats

Ogata, K, Yahiro, M, Hashimoto, S, Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Iseri, Y, Kan, M, Advanced Information Systems R and D Department, Hitachi Ltd., Kawasaki 212-8567, Kamimura, M, and RIKEN Nishina Center, Wako 351-0198. Nuclear Astrophysics Studies with the Method of Continuum-Discretized Coupled-Channels. United States: N. p., 2010. Web. doi:10.1063/1.3442599.
Ogata, K, Yahiro, M, Hashimoto, S, Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Iseri, Y, Kan, M, Advanced Information Systems R and D Department, Hitachi Ltd., Kawasaki 212-8567, Kamimura, M, & RIKEN Nishina Center, Wako 351-0198. Nuclear Astrophysics Studies with the Method of Continuum-Discretized Coupled-Channels. United States. doi:10.1063/1.3442599.
Ogata, K, Yahiro, M, Hashimoto, S, Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Iseri, Y, Kan, M, Advanced Information Systems R and D Department, Hitachi Ltd., Kawasaki 212-8567, Kamimura, M, and RIKEN Nishina Center, Wako 351-0198. Wed . "Nuclear Astrophysics Studies with the Method of Continuum-Discretized Coupled-Channels". United States. doi:10.1063/1.3442599.
@article{osti_21362019,
title = {Nuclear Astrophysics Studies with the Method of Continuum-Discretized Coupled-Channels},
author = {Ogata, K and Yahiro, M and Hashimoto, S and Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195 and Iseri, Y and Kan, M and Advanced Information Systems R and D Department, Hitachi Ltd., Kawasaki 212-8567 and Kamimura, M and RIKEN Nishina Center, Wako 351-0198},
abstractNote = {The method of continuum-discretized coupled-channels (CDCC) is applied to two nuclear astrophysics studies. One is the determination of the astrophysical factor S{sub 17}(0) for the {sup 7}Be(p,gamma){sup 8}B reaction from the analysis of {sup 8}B breakup by {sup 208}Pb at 52 A MeV. We obtain S{sub 17}(0) = 20.9{sub -1.9}{sup +2.0} eV b, which is significantly larger than the previous one, S{sub 17}(0) = 18.9+-1.8 eV b, determined from an analysis with the virtual photon theory. The difference between the two values is found to be due to the contributions from nuclear breakup and higher-order processes. The other application of CDCC is the re-evaluation of the triple-alpha reaction rate by directly solving the three-body Schroedinger equation. The resonant and nonresonant processes are treated on the same footing. An accurate description of the alpha-alpha nonresonant states significantly quenches the Coulomb barrier between the first two alpha-particles and the third alpha-particle. Consequently, the alpha-alpha nonresonant continuum states give a markedly larger contribution at low temperatures than that reported in previous studies. We find an increase in triple-alpha reaction rate by 26 orders of magnitude around 10{sup 7} K compared with the rate of NACRE.},
doi = {10.1063/1.3442599},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1235,
place = {United States},
year = {2010},
month = {5}
}