https://doi.org/10.1051/epjconf/202327911003
Measurement of the 86Kr(α,n)89Sr cross section at energies relevant for the weak r-process
1 University of York, Heslington, York, YO10 5DD, United Kingdom
2 Triumf, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
3 CTU, 166 36 Prague 6, Czechia
4 University of Guelph, 50 Stone Rd E, Guelph, ON N1G 2W1, Canada
5 Simon Fraser University, 8888 University Dr, Burnaby, BC V5A 1S6, Canada
6 Instituto de Ciencia de Materiales de Sevilla, CSIC-Univ. Seville, Avda. Américo Vespucio 49, 41092 Seville, Spain
7 Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, South Korea
8 Colorado School of Mines, 1500 Illinois St, Golden, CO 80401, United States
9 Technische Universität Darmstadt, Schlossgartenstrasse 2, 64289 Darmstadt, Germany
10 Department of Physics, University of Basel, 4056 Basel, Switzerland
11 Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB, United Kingdom
12 CEMHTI, UPR3079 CNRS, 1D avenue de la Recherche Scientifique, 45071 Orléans, France
13 University of Notre Dame, Notre Dame, IN 46556, United States
14 University of British Columbia, Vancouver BC V6T 1Z4, Canada
* Corresponding author: cja543@york.ac.uk
Published online: 22 March 2023
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.
© The Authors, published by EDP Sciences, 2023
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