Very low energy protons from β-delayed p-decay of proton-rich nuclei for nuclear astrophysics

Details Very low energy protons from β-delayed p-decay of proton-rich nuclei for nuclear astrophysics Very low energy protons from β-delayed p-decay of proton-rich nuclei for nuclear astrophysics

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..haw.kg002s&link_type=abstract

American Physical Society, 3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan, October 1

Physics

Nuclear Physics

Scientific paper

We developed a technique to measure very low energy protons from the beta-delayed proton-decay of proton-rich nuclei produced and separated with the MARS recoil separator at TAMU. A simple setup consisting of a telescope made of a thin double sided Si strip detector (p-detector) backed or sandwiched between two thick Si detectors (β-detectors) was designed. The source nuclei are slowed down from 30-40 MeV/u and implanted in the middle of the thin p-detector. The excited states populated in daughter nucleus above the proton threshold are resonances in the radiative proton capture leading to that nucleus; therefore, beta-decay can be a useful mechanism to study these resonances. In particular, we have studied ^23Al and ^31Cl and got information on the resonances of ^22Na(p,γ)^23Mg and ^30P(p,γ)^31S reactions, both important in novae. We studied different W1 and BB2 p-detectors, 45-140 μm thick, made by MSL, and found that thinner detectors with a small cell size are best to measure proton energies as low as 2-300 keV.

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