Nuclear astrophysics studies with the method of continuum-discretized coupled-channels

K. Ogata, S. Hashimoto, Y. Iseri, M. Kan, M. Kamimura, Masanobu Yahiro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The method of continuum-discretized coupled-channels (CDCC) is applied to two nuclear astrophysics studies. One is the determination of the astrophysical factor S17(0) for the 7Be(p,γ)8B reaction from the analysis of 8B breakup by 208Pb at 52 A MeV. We obtain S17(0) = 20.9+2.0-1.9 eV b, which is significantly larger than the previous one, S17(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-α reaction rate by directly solving the three-body Schrödinger equation. The resonant and nonresonant processes are treated on the same footing. An accurate description of the α-α nonresonant states significantly quenches the Coulomb barrier between the first two α-particles and the third α-particle. Consequently, the α-α nonresonant continuum states give a markedly larger contribution at low temperatures than that reported in previous studies. We find an increase in triple-α reaction rate by 26 orders of magnitude around 107 K compared with the rate of NACRE.

Original languageEnglish
Title of host publicationNuclear Physics Trends - 7th China-Japan Joint Nuclear Physics Symposium
Pages228-234
Number of pages7
DOIs
Publication statusPublished - Jul 20 2010
Event7th Japan-China Joint Nuclear Physics Symposium - Tsukuba, Japan
Duration: Nov 9 2009Nov 13 2009

Publication series

NameAIP Conference Proceedings
Volume1235
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other7th Japan-China Joint Nuclear Physics Symposium
CountryJapan
CityTsukuba
Period11/9/0911/13/09

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Ogata, K., Hashimoto, S., Iseri, Y., Kan, M., Kamimura, M., & Yahiro, M. (2010). Nuclear astrophysics studies with the method of continuum-discretized coupled-channels. In Nuclear Physics Trends - 7th China-Japan Joint Nuclear Physics Symposium (pp. 228-234). (AIP Conference Proceedings; Vol. 1235). https://doi.org/10.1063/1.3442599