Physics – Nuclear Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dnp.bd013c&link_type=abstract
American Physical Society, Division of Nuclear Physics Meeting, October 4-7, 2000 Williamsburg, VA, abstract #BD.013
Physics
Nuclear Physics
Scientific paper
The ^21Na(p,γ)^22Mg reaction rate is the largest uncertainty in the amount of ^22Na produced in the rp-process in ONeMg nova, and this reaction rate depends on the structure of ^22Mg. In the past, the ^22Mg nucleus has been studied with the ^24Mg(p,t) and ^20Ne(^3He,n) reactions which preferentially populate natural parity states; the (^3He,^6He) reaction has no such selectivity. Recent re-measurement of the ^24Mg(p,t)^22Mg reaction (Bateman et al.) and a new ^12C(^16O,^6He)^22Mg (Chen et al.) measurement suggest possible discrepancies with the previous measurements. One of the discrepancies suggested is a missing 5.837 MeV state, which was reported in one (^3He,n) experiment, but was not observed in (p,t) or (^16O,^6He) measurements. Proton capture into that level is the second-most dominant contributor to the capture rate, and thus its absence has significant implications for ^22Na production in novae. For these reasons, the ^22Mg nucleus was studied using the ^25Mg(^3He,^6He)^22Mg reaction at 51 MeV using the modified Enge split-pole spectrograph at Yale University. The experiment and analysis will be presented.
Bradfield-Smith W.
Caggiano J. A.
Ernst Rehm K.
Greene John P.
Lewis Randy
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