Resonance strengths in the N14(p,γ)O15 and N15(p,αγ)C12 reactions

Michele Marta, Erik Trompler, Daniel Bemmerer, Roland Beyer, Carlo Broggini, Antonio Caciolli, Martin Erhard, Zsolt Fülöp, Eckart Grosse, György Gyürky, Roland Hannaske, Arnd R. Junghans, Roberto Menegazzo, Chithra Nair, Ronald Schwengner, Tamás Szücs, Simone Vezzú, Andreas Wagner, and Dmitry Yakorev
Phys. Rev. C 81, 055807 – Published 27 May 2010

Abstract

The N14(p,γ)O15 reaction is the slowest reaction of the carbon-nitrogen-oxygen cycle of hydrogen burning in stars. As a consequence, it determines the rate of the cycle. The N15(p,αγ)C12 reaction is frequently used in inverse kinematics for hydrogen depth profiling in materials. The N14(p,γ)O15 and N15(p,αγ)C12 reactions have been studied simultaneously, using titanium nitride targets of natural isotopic composition and a proton beam. The strengths of the resonances at Ep=1058 keV in N14(p,γ)O15 and at Ep=897 and 430 keV in N15(p,αγ)C12 have been determined with improved precision, relative to the well-known resonance at Ep=278 keV in N14(p,γ)O15. The new recommended values are ωγ=0.353±0.018, 362±20, and 21.9±1.0 eV for their respective strengths. In addition, the branching ratios for the decay of the Ep=1058 keV resonance in N14(p,γ)O15 have been redetermined. The data reported here should facilitate future studies of off-resonant capture in the N14(p,γ)O15 reaction that are needed for an improved R-matrix extrapolation of the cross section. In addition, the data on the 430 keV resonance in N15(p,αγ)C12 may be useful for hydrogen depth profiling.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
1 More
  • Received 24 March 2010

DOI:https://doi.org/10.1103/PhysRevC.81.055807

©2010 American Physical Society

Authors & Affiliations

Michele Marta1, Erik Trompler1, Daniel Bemmerer1, Roland Beyer1, Carlo Broggini2, Antonio Caciolli2, Martin Erhard2, Zsolt Fülöp3, Eckart Grosse1, György Gyürky3, Roland Hannaske1, Arnd R. Junghans1, Roberto Menegazzo2, Chithra Nair1, Ronald Schwengner1, Tamás Szücs1,3, Simone Vezzú4, Andreas Wagner1, and Dmitry Yakorev1

  • 1Forschungszentrum Dresden-Rossendorf (FZD), Dresden, Germany
  • 2Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Padova, Padova, Italy
  • 3Institute of Nuclear Research (ATOMKI), Debrecen, Hungary
  • 4Coordinamento Interuniversitario Veneto per le Nanotechnologie (CIVEN), Venice, Italy

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 81, Iss. 5 — May 2010

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×