Experimental evidence of a natural parity state in ^26Mg at astrophysically relevant energies via the ^22Ne(^6Li,d)^26Mg reaction.

Details Experimental evidence of a natural parity state in ^26Mg at astrophysically relevant energies via the ^22Ne(^6Li,d)^26Mg reaction. Experimental evidence of a natural parity state in ^26Mg at astrophysically relevant energies via the ^22Ne(^6Li,d)^26Mg reaction.

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..aprx15005u&link_type=abstract

American Physical Society, APS April Meeting, April 14-17, 2007, abstract #X15.005

Physics

Scientific paper

The ^22Ne(,)^25Mg reaction has been regarded as the main neutron source for the s-process in core He-burning massive stars and of relevance in He-shell burning in AGB stars. Its present rate is one of the most important sources of uncertainty in the nucleosynthesis of heavy elements. We have studied natural parity states in ^26Mg via the ^22Ne(^6Li,d)^26Mg direct process with Yale University's Enge split-pole spectrograph. Our method significantly improves the energy resolution of previous experiments and as a result we report the observation of a natural parity state in ^26Mg at an energy where the stellar rate of the ^22Ne(,)^26Mg reaction may be reduced. This fact gives place to an increase in the production of weak component s-process neutrons via the ^22Ne(,)^25Mg reaction. Possible spin-parity assignments are suggested as well.

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