Technique and study of β-delayed p-decay of proton-rich nuclei

Details Technique and study of β-delayed p-decay of proton-rich nuclei Technique and study of β-delayed p-decay of proton-rich nuclei

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dnp.ee004t&link_type=abstract

American Physical Society, 2007 Annual Meeting of the Division of Nuclear Physics, October 10-13,2007, abstract #EE.004

Physics

Nuclear Physics

Scientific paper

We developed a technique to measure beta-delayed proton-decay of proton-rich nuclei produced and separated with the MARS recoil separator at TAMU. In particular we studied the case of ^23Al produced in inverse kinematics. Its β-decay was studied before, using β-γ coincidence techniques. The states populated in ^23Mg above the proton threshold at Sp=7580 keV may proton decay. They are resonances in the proton capture reaction ^22Na(p,γ)^23Mg, crucially important for the depletion of ^22Na in ONe novae. A setup consisting of a thin Si strip detector (p-detector) and a thick Si detector (β-detector) was designed. A HpGe detector outside the chamber detected γ-rays. A rotating energy-degrader was used to implant the source nuclei (from 40 MeV/u) in the middle of the thin p-detector. We have pulsed the beam from the cyclotron, implanted the source, then measured β-p and β-γ coincidences off-beam. The technique has shown a remarkable selectivity to β-delayed charged particle emission and would work even at radioactive beam rates of a few pps.

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