Study of the Stellar Reaction ^21Na(p,γ)^22Mg by the (p,t) Reaction.

Details Study of the Stellar Reaction ^21Na(p,γ)^22Mg by the (p,t) Reaction. Study of the Stellar Reaction ^21Na(p,γ)^22Mg by the (p,t) Reaction.

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..haw.kb007m&link_type=abstract

American Physical Society, First Joint Meeting of the Nuclear Physicists of the American and Japanese Physical Societies October

Physics

Scientific paper

One of the interesting topics about the rp-process is ^22Na production in novae. The 1.275MeV gamma line following the beta decay of ^22Na could be detected with a gamma-ray observatory. ^22Na will be produced through ^21Na(p,γ)^22Mg(β^+)^22Na. Therefore, this production will be affected by the reaction rate of ^21Na(p,γ)^22Mg, where resonant states around the Gamow window ( ~ 300keV above the proton threshold at 5.501 MeV) in ^22Mg play a key role for ^22Mg production. We performed an experiment to study excited states arround the proton threshold in ^22Mg by the ^24Mg(p,t) reaction. A 34.7-MeV proton beam bombarded a ^24Mg target enriched isotopically. We measured angular distributions for these excited states using a high resolution spectrograph, PA at CNS-SF cycrotron facility. We have reconfirmed three new states at 5.959, 6.246, 6.313 MeV identified in our first experiment in ^22Mg, and also succeeded in determining excitation energies, spins and parities for the excited states at 5.0-7.0 MeV in ^22Mg including for these new states. The new spin assignments include J^π=6^+,4^+ for the states at 6.246, 6.313 MeV. We will discuss on the experimental results and the influences for nucleosynthesis in novae.

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