Lifetime measurement of the 6.79 MeV state in 15O with the AGATA demonstrator

R. Depalo, C. Michelagnoli, R. Menegazzo, C. A. Ur, D. Bazzacco, D. Bemmerer, C. Broggini, A. Caciolli, M. Erhard, E. Farnea, Zs Fülöp, A. Gottardo, N. Keeley, S. Lunardi, M. Marta, D. Mengoni, T. Mijatović, F. Recchia, C. Rossi-Alvarez, T. SzücsJ. J. Valiente-Dobon

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

Abstract

The 14N(p,γ)15O reaction is the slowest process of the CN cycle, and thus it is of high astrophysical interest since it regulates the total rate of energy and neutrinos production through the cycle. The 14N+p ground state capture is strongly influenced by a sub-threshold resonance corresponding to the 6.79 MeV state in 15O. The width of this resonance is a major source of uncertainty in the extrapolation of the reaction cross section in the Gamow energy window. Preliminary results of a new Doppler Shift Attenuation measurement of the lifetime of the 6.79 MeV state in 15O are discussed. The level of interest was populated via the 2H(14N,n)15O reaction in inverse kinematics at 32 MeV beam energy. The gamma-rays emitted in the decay of the 6.79 MeV level to the ground state were detected with the AGATA Demonstrator array of high-purity germanium detectors. The sensitivity of the shape of the peak in the gamma-ray energy spectrum to the level lifetime is investigated comparing the experimental peaks with detailed Monte Carlo simulations of the reaction mechanisms and the gamma-ray emission and detection. Nuclear levels in 15N (also populated in the 14N+ 2H reaction) for which the lifetimes are known in the literature provided a test of the analysis technique.

Original languageEnglish
Title of host publicationExotic Nuclei and Nuclear/Particle Astrophysics (IV). From Nuclei to Stars - Carpathian Summer School of Physics 2012
Pages319-323
Number of pages5
DOIs
Publication statusPublished - Dec 1 2012
EventCarpathian Summer School of Physics 2012: Exotic Nuclei and Nuclear/Particle Astrophysics (IV). From Nuclei to Stars, CSSP 2012 - Sinaia, Romania
Duration: Jun 24 2012Jul 7 2012

Publication series

NameAIP Conference Proceedings
Volume1498
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceCarpathian Summer School of Physics 2012: Exotic Nuclei and Nuclear/Particle Astrophysics (IV). From Nuclei to Stars, CSSP 2012
CountryRomania
CitySinaia
Period6/24/127/7/12

Keywords

  • AGATA
  • CNO cycle
  • Doppler Shift Attenuation
  • gamma-ray tracking

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Depalo, R., Michelagnoli, C., Menegazzo, R., Ur, C. A., Bazzacco, D., Bemmerer, D., Broggini, C., Caciolli, A., Erhard, M., Farnea, E., Fülöp, Z., Gottardo, A., Keeley, N., Lunardi, S., Marta, M., Mengoni, D., Mijatović, T., Recchia, F., Rossi-Alvarez, C., ... Valiente-Dobon, J. J. (2012). Lifetime measurement of the 6.79 MeV state in 15O with the AGATA demonstrator. In Exotic Nuclei and Nuclear/Particle Astrophysics (IV). From Nuclei to Stars - Carpathian Summer School of Physics 2012 (pp. 319-323). (AIP Conference Proceedings; Vol. 1498). https://doi.org/10.1063/1.4768511