β decay of proton-rich nucleus Al23 and astrophysical consequences

Details β decay of proton-rich nucleus Al23 and astrophysical consequences β decay of proton-rich nucleus Al23 and astrophysical consequences

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvc..74d5810i&link_type=abstract

Physical Review C, vol. 74, Issue 4, id. 045810

Physics

Nuclear Physics

18

Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments, Beta Decay, Double Beta Decay, Electron And Muon Capture, 20<=A<=38, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments

Scientific paper

We present the first study of the β decay of Al23 undertaken with pure samples. The study was motivated by nuclear astrophysics questions. Pure samples of Al23 were obtained from the momentum achromat recoil separator (MARS) of Texas A&M University, collected on a fast tape-transport system, and moved to a shielded location where β and β-γ coincidence measurements were made. We deduced β branching ratios and log ft values for transitions to states in Mg23, and from them determined unambiguously the spin and parity of the Al23 ground state to be Jπ=5/2+. We discuss how this excludes the large increases in the radiative proton capture cross section for the reaction Mg22(p,γ)Al23 at astrophysical energies, which were implied by claims that the spin and parity is Jπ=1/2+. The log ft for the Fermi transition to its isobaric analog state (IAS) in Mg23 is also determined for the first time. This IAS and a state 16 keV below it are observed, well separated in the same experiment for the first time. We can now solve a number of inconsistencies in the literature, exclude strong isospin mixing claimed before, and obtain a new determination of the resonance strength. Both states are resonances in the Na22(p,γ)Mg23 reaction at energies important in novae. The reactions Mg22(p,γ)Al23 and Na22(p,γ)Mg23 have both been suggested as possible candidates for diverting some of the flux in oxygen-neon novae explosions from the A=22 into the A=23 mass chain.

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