First Direct Measurement of an Astrophysical p-Process Reaction Cross Section Using a Radioactive Ion Beam

Abstract

We have performed the first direct measurement of the 83Rb(p,g) radiative capture reaction cross section in inverse kinematics using a radioactive beam of 83Rb at incident energies of 2.4 and 2.7 A MeV. The measured cross section at an effective relative kinetic energy of Ecm = 2.393 MeV, which lies within the relevant energy window for core collapse supernovae, is smaller than the prediction of statistical model calculations. This leads to the abundance of 84Sr produced in the astrophysical p process being higher than previously calculated. Moreover, the discrepancy of the present data with theoretical predictions indicates that further experimental investigation of p-process reactions involving unstable projectiles is clearly warranted.

6 pages, 4 figures, published in Physical Review Letters

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Cited by in corpus (10)

• Horizons: Nuclear Astrophysics in the 2020s and Beyond
• The $\gamma$-process nucleosynthesis in core-collapse supernovae. I. A novel analysis of $\gamma$-process yields in massive stars
• Constraining the Astrophysical p Process: Cross Section Measurement of the 84Kr(p,g)85Rb Reaction in Inverse Kinematics
• Cross Section Measurement of the ${}^{82}$Kr(p,$\gamma$)${}^{83}$Rb Reaction in Inverse Kinematics
• Cross Sections of the ${}^{83}$Rb(p,$\gamma {)}^{84}$Sr and ${}^{84}$Kr(p,$\gamma {)}^{85}$Rb Reactions at Energies Characteristic of the Astrophysical $\gamma$ Process
• First Proton-Induced Cross Sections on a Stored Rare Ion Beam: Measurement of 118Te(p,γ) for Explosive Nucleosynthesis
• A Vision for the Science of Rare Isotopes
• Constraining the Synthesis of the Lightest p Nucleus 74Se
• Photo-nuclear reaction rates of ${}^{157,159}$Ho and ${}^{163,165}$Tm and their impact in the $\gamma$--process
• Transmission Efficiency of the Recoil Mass Spectrometer EMMA at TRIUMF