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 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..dnp.mg007s&link_type=abstract

American Physical Society, 2008 Annual Meeting of the Division of Nuclear Physics, October 23-26, 2008, abstract #MG.007

Physics

Nuclear Physics

Scientific paper

Orbiting gamma ray telescopes have yet to observe the elusive ^22Na isotope. More sensitive observatories are planned, and 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 a nova explosion. In particular, a state in ^23Mg reported by Jenkins [1] implies a possible resonance at Ep = 198 keV which could be significant. We are in the process of measuring the ^22Na(p,γ) reaction rate directly by using protons from the UW tandem on a specially designed beamline, which includes rastering and cold vacuum protection of the ^22Na implanted targets, fabricated at TRIUMF. A multitude of target tests have been performed with stable ^23Na, focusing on sodium stability with respect to sputtering and heating caused by our high intensity beam. Utilizing two 100% Ge detectors with anticoincidence shields to reduce cosmic backgrounds, preliminary measurements have been performed on known resonances of ^22Na, as well as on the proposed new resonance. Results will be presented. [1] Jenkins et al., PRL 92 (2004) 031101

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