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

• Published in: EPJ Web of conferences Vol. 279; p. 11003
• Main Authors: 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
• Format: Journal Article
• Language: English
• Published: EDP Sciences 01-01-2023
• ISSN: 2100-014X
• DOI: 10.1051/epjconf/202327911003

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.