The structure of ^23Al and consequences on the depletion of ^22Na from ONe novae

Details The structure of ^23Al and consequences on the depletion of ^22Na from ONe novae The structure of ^23Al and consequences on the depletion of ^22Na from ONe novae

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..aprm15003z&link_type=abstract

American Physical Society, APS April Meeting, April 14-17, 2007, abstract #M15.003

Physics

Scientific paper

There is interest in the structure of ^23Al due to the contribution of the ^22Mg(p, γ)^23Al and ^22Na(p, γ)^23Mg reactions in the depletion of ^22Na from ONe novae. Using MARS we produced and separated pure ^23Al samples with a 48 MeV/u ^24Mg beam from the K500 cyclotron at Texas A&M University. New β and β-γ coincidence measurements were made with a thin scintillator, an HPGe detector and a fast tape transport system. Addition of a BGO Compton shield improved very much the quality of the γ spectra around the transitions from the IAS state at 7803 keV. From the measured β singles and β-γ coincidence decay spectra we obtained the ^23Al β-decay scheme, branching ratios and absolute logft values for several transitions. We clearly determined that the ^23Al ground state spin and parity is J^π=5/2^+ , not 1/2^+, and also found spectroscopic information for the states that are resonances in the ^22Na(p, γ)^23Mg reaction. It follows that the larger capture rate implied by the now-rejected lower spin value for ^23Al can not explain the missing 1275 keV cosmic γ -ray from the decay of long-lived ^22Na, the last step in the hot NeNa cycle.

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