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New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements
- Source :
- EPJ Web of Conferences, Vol 279, p 13001 (2023)
- Publication Year :
- 2023
- Publisher :
- EDP Sciences, 2023.
-
Abstract
- Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant and massive stars. However, neutron capture measurements via the time-of-flight (TOF) technique on key s-process nuclei are often challenging. Difficulties arise from the limited mass (∼mg) available and the high sample-related background in the case of the unstable s-process branching points. Measurements on neutron magic nuclei, that act as s-process bottlenecks, are affected by low (n,γ) cross sections and a dominant neutron scattering background. Overcoming these experimental challenges requires the combination of facilities with high instantaneous flux, such as n_TOFEAR2, with detection systems with an enhanced detection sensitivity and high counting rate capabilities. This contribution reviews some of the latest detector developments in detection systems for (n,γ) measurements at n_TOF, such as i-TED, an innovative detection system which exploits the Compton imaging technique to reduce the dominant neutron scattering background and s-TED, a highly segmented total energy detector intended for high flux facilities. The discussion will be illustrated with results of the first measurement of key the s-process branching-point reaction 79Se(n,γ).
Details
- Language :
- English
- ISSN :
- 2100014X
- Volume :
- 279
- Database :
- Directory of Open Access Journals
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.b97cff7625f74c3396984af6d01e8b6c
- Document Type :
- article
- Full Text :
- https://doi.org/10.1051/epjconf/202327913001