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Key Resonances in the 30P(p,gamma)31S Gateway Reaction for the Production of Heavy Elements in ONe Novae

Research output: Contribution to journalArticle

  • Daniel Doherty
  • Philip Woods
  • Gavin Lotay
  • Darek Seweryniak
  • Mike Carpenter
  • Chris Chiara
  • Helena David
  • Robert Janssens
  • Livius Trache
  • Shaofei Zhu

Related Edinburgh Organisations

Original languageEnglish
Article number262502
Number of pages5
JournalPhysical Review Letters
Volume108
Issue number26
Early online date28 Jun 2012
DOIs
StatePublished - 28 Jun 2012

Abstract

Material emitted as ejecta from ONe novae outbursts is observed to be rich in elements as heavy as Ca. The bottleneck for the synthesis of elements beyond sulphur is the 30P(p,γ)31S reaction. Its reaction rate is, however, not well determined due to uncertainties in the properties of key resonances in the burning regime. In the present study, gamma-ray transitions are reported for the first time from all key states in 31S relevant for the 30P(p,γ)31S reaction. The spins and parity of these resonances have been deduced, and energies have been measured with the highest precision to date. The uncertainty in the estimated 30P(p,γ)31S reaction rate has been drastically reduced. The rate using this new information is typically higher than previous estimates based on earlier experimental data, implying a higher flux of material processed to high-Z elements in novae, but it is in good agreement with predictions using the Hauser-Feshbach approach at higher burning temperatures.

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