skip to main content

Title: β-delayed α decay of {sup 16}N and the {sup 12}C(α,γ){sup 16}O cross section at astrophysical energies: A new experimental approach

The {sup 12}C(α,γ){sup 16}O reaction at energies corresponding to the quiescent helium burning in massive stars is regarded as one of the most important processes in nuclear astrophysics. Although this process has being studied for over four decades, our knowledge of its cross section at the energies of interest for astrophysics is still widely unsatisfactory. Indeed, no experimental data are available around 300 keV and in the energy region of astrophysical interest extrapolations are performed using some theoretical approaches, usually R-matrix calculations. Consequently, the published astrophysical factors range from 1 to 288 keVb for S{sub E1}(300) and 7 to 120 keVb for S{sub E2}(300), especially because of the unknown contribution coming from subthreshold resonances. To improve the reliability of these extrapolations, data from complementary experiments, such as elastic and quasi- elastic α scattering on {sup 12}C, α-transfer reactions to {sup 16}O, and {sup 16}N decay are usually included in the analysis. Here the β-delayed α decay of {sup 16}N is used to infer information on the {sup 12}C(α,γ){sup 16}O reaction and a new experimental technique is suggested.
Authors:
 [1] ; ; ;  [2] ; ; ; ;  [3] ;  [4] ; ; ;  [5] ; ;  [6] ;  [7] ; ; ;  [8] ;  [9] ;  [10] more »; « less
  1. Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Via S.Sofia 64, 95123 Catania (Italy)
  2. Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Via S.Sofia 64, 95123 Catania, Italy and INFN - Laboratori Nazionali del Sud, Catania (Italy)
  3. INFN - Laboratori Nazionali del Sud, Catania (Italy)
  4. INFN - Laboratori Nazionali del Sud, Catania, Italy and Università Kore, Enna (Italy)
  5. Center for Nuclear Study, University of Tokyo, Wako Branch, Saitama (Japan)
  6. RIKEN Nishina Center, Wako, Saitama (Japan)
  7. RCNP, Osaka University, Osaka (Japan)
  8. Department of Physics, Tohoku University, Sendai (Japan)
  9. Department of Physics, Kyushu University, Fukuoka (Japan)
  10. Dipartimento di Fisica e Astronomia, Università di Padova and INFN-Sez. Padova, Padova (Italy)
Publication Date:
OSTI Identifier:
22391002
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1645; Journal Issue: 1; Conference: Carpathian Summer School of Physics 2014, Sinaia (Romania), 13-26 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA REACTIONS; ASTROPHYSICS; CARBON 12; CARBON 12 TARGET; CROSS SECTIONS; EXTRAPOLATION; HELIUM BURNING; KEV RANGE; NITROGEN 16; OXYGEN 16; R MATRIX; SCATTERING; STARS; TRANSFER REACTIONS