Feb 7 – 9, 2017
Radisson Hotel Lansing
US/Eastern timezone

Plans to constrain the 30P(p,γ)31S thermonuclear reaction rate by measuring the branching ratio of 31Cl β-delayed protons

Feb 7, 2017, 4:45 PM
1h 15m
Radisson Hotel Lansing

Radisson Hotel Lansing

111 N Grand Ave, Lansing, MI 48933
Poster [Main Conference] Poster session


Mr Tamas Budner (Michigan State University)


Theoretical calculations of the relative isotopic abundances of classical nova ejecta depend heavily on certain radiative proton-capture reaction rates. Perhaps the most important uncertainty is the thermonuclear rate of the 30P(p,γ)31S reaction. Currently, technical challenges make measuring this reaction directly unfeasible. However, the 30P(p,γ)31S reaction is dominated by resonances, and it was recently shown that one potentially dominant resonance is strongly populated by the β-decay of 31Cl. We have designed and built a micro pattern gas amplifier proton detector at NSCL, which in tandem with the SeGA high purity germanium γ-ray detectors, will allow us to measure the branching ratio of 31Cl β-delayed proton emission through the resonance of interest, thus constraining the 30P(p,γ)31S reaction rate. By using our measured rate and comparing to observations of elemental abundances in nova ejecta, we could provide a calibrated peak temperature reached inside a classical nova, improving the accuracy of astrophysical models and helping to identify presolar grains from novae.

Primary author

Mr Tamas Budner (Michigan State University)


Chris Wrede (MSU/NSCL) Moshe friedman (NSCL) Pranjal Tiwari (Michigan State University)

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