Published March 4, 2005 | Version v1
Journal article Metadata-only

Direct measurement of the 14N(p,γ)15O S factor

Creators

  • 1. Triangle Universities Nuclear Laboratory, Durham, North Carolina, 27708-0308 (United States)
  • 2. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255 (United States)
  • 3. Centre de Recherches du Cyclotron, Universite catholique de Louvain, B-1348 Louvain-la-Neuve (Belgium)

Description

The 14N(p,γ)15O reaction regulates the rate of energy generation in the stellar CN cycle. Because discrepancies have been found in the analysis and interpretation of previous capture data, we have measured the 14N(p,γ)15O excitation function for energies in the range Eplab=155-524 keV. Fits of these data using R-matrix theory yield a value for the S factor at zero energy of 1.68±0.09(stat)±0.16(syst) keV b, which is significantly smaller than the previous result. The corresponding reduction in the stellar reaction rate for 14N(p,γ)15O has a number of interesting consequences, including an impact on estimates for the age of the Galaxy derived from globular clusters

Additional details

Identifiers

DOI
10.1103/PhysRevLett.94.082503;
arXiv
arXiv:nucl-ex/0408018v1;

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
94
Journal Issue
8
Journal Page Range
p. 082503-082503.4
ISSN
0031-9007
CODEN
PRLTAO

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
36069079
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Descriptors DEI
CAPTURE; EXCITATION FUNCTIONS; GALAXIES; GAMMA RADIATION; KEV RANGE 100-1000; NITROGEN 14 TARGET; NUCLEAR REACTION KINETICS; OXYGEN 15; PROTON REACTIONS; R MATRIX; STAR CLUSTERS; STELLAR ACTIVITY
Descriptors DEC
BARYON REACTIONS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; DIFFERENTIAL CROSS SECTIONS; ELECTROMAGNETIC RADIATION; ENERGY RANGE; EVEN-ODD NUCLEI; FUNCTIONS; HADRON REACTIONS; IONIZING RADIATIONS; ISOTOPES; KEV RANGE; KINETICS; LIGHT NUCLEI; MATRICES; MINUTES LIVING RADIOISOTOPES; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; OXYGEN ISOTOPES; RADIATIONS; RADIOISOTOPES; REACTION KINETICS; TARGETS

Optional Information

Notes
(c) 2005 The American Physical Society