EPJ Web of Conferences (Jan 2023)

Measurement of the 86Kr(α,n)89Sr cross section at energies relevant for the weak r-process

  • Angus Cameron,
  • Williams Matthew,
  • Andreyev Andrei,
  • Bhattacharjee Soumendu,
  • Buck Samantha,
  • Chakraborty Soham,
  • Davids Barry,
  • Diget Christian,
  • Garnsworthy Adam,
  • Griffin Chris,
  • Fernandez Asunción,
  • Hackman Greg,
  • Hudson Kevan,
  • Hufschmidt Dirk,
  • Karayonchev Vasil,
  • Kim Yong,
  • Laird Alison,
  • Lennarz Annika,
  • Mashtakov Konstantin,
  • Machule Peter,
  • Natzke Connor,
  • Pak Kihong,
  • Psaltis Athanasios,
  • Radich Allison,
  • Rauscher Thomas,
  • Rhodes Daniel,
  • Sauvage Thierry,
  • Simon Anna,
  • Svensson Carl,
  • Upadhyayula Sriteja,
  • Williams Jonathan,
  • Yates Daniel,
  • Zidar Tammy

DOI
https://doi.org/10.1051/epjconf/202327911003
Journal volume & issue
Vol. 279
p. 11003

Abstract

Read online

The r-process has been shown to be robust in reproducing the abundance distributions of heavy elements, such as europium, seen in ultra-metal poor stars. In contrast, observations of elements 26 < Z < 47 display overabundances relative to r-process model predictions. A proposed additional source of early nucleosynthesis is the weak r-process in neutrino-driven winds of core-collapse supernovae. It has been shown that in this site (α,n) reactions are both crucial to nucleosynthesis and the main source of uncertainty in model-based abundance predictions. Aiming to improve the certainty of nucleosynthesis predictions, the cross section of the important reaction 86Kr(α,n)89Sr has been measured at an energy relevant to the weak r-process. This experiment was conducted in inverse kinematics at TRIUMF with the EMMA recoil mass spectrometer and the TIGRESS gamma-ray spectrometer. A novel type of solid helium target was used.