Probing Nucleosynthesis in Novae: ^22Na(p,γ)^23Mg

Details Probing Nucleosynthesis in Novae: ^22Na(p,γ)^23Mg Probing Nucleosynthesis in Novae: ^22Na(p,γ)^23Mg

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..haw.bg007s&link_type=abstract

American Physical Society, 3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan, October 1

Physics

Nuclear Physics

Scientific paper

Orbiting gamma ray telescopes have yet to observe the elusive ^22Na isotope. More sensitive observatories are planned. Present uncertainties in the dominant destructive reaction, ^22Na(p,γ), suggest new measurements in the proton energy range of 150 to 300 keV are needed to clarify the predictions of the amount of ^22Na expected in novae explosions. In particular, Ref [1] suggested that a possible resonance at Ep = 198 keV could be significant. We have measured the ^22Na(p,γ) resonance strengths and energies directly by using protons from the University of Washington accelerator with a specially designed beamline, which included rastering and cold vacuum protection of the ^22Na implanted targets, fabricated at TRIUMF. Utilizing two high-purity germanium detectors with anticoincidence shields to reduce cosmic backgrounds, measurements have been performed on known resonances of ^22Na+p, as well as on the proposed new resonance. Results will be presented. These indicate that the dominant contribution to the reaction rate in the temperature region of interest to novae is the resonance at Ep = 214 keV, rather than the suggested new resonance at Ep = 198 keV. [1] Jenkins et al., PRL 92 (2004) 031101

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