Abstract
Neutron capture cross sections of unstable isotopes are important for neutron-induced nucleosynthesis as well as for technological applications. A combination of a radioactive beam facility, an ion storage ring and a high flux reactor would allow a direct measurement of neutron induced reactions over a wide energy range on isotopes with half lives down to minutes. The idea is to measure neutron-induced reactions on radioactive ions in inverse kinematics. This means, the radioactive ions will pass through a neutron target. In order to efficiently use the rare nuclides as well as to enhance the luminosity, the exotic nuclides can be stored in an ion storage ring. The neutron target can be the core of a research reactor, where one of the central fuel elements is replaced by the evacuated beam pipe of the storage ring. Using particle detectors and Schottky spectroscopy, most of the important neutron-induced reactions, such as (n,γ), (n,p), (n,α), (n,2n), or (n,f), could be investigated.
Highlights
Almost all of the heavy elements are produced via neutron capture reactions shared between s and r process [1,2,3] and to a very small extent by the i process [4, 5]
The remaining minor part is produced via photon- and protoninduced reactions during the p process, see Fig. 1
Like the investigation of time-reversed reactions, are very often the only choice because of the short half-lives of the investigated isotopes [10,11,12], this article is focussing on experimental developments aiming at a better understanding of the s, i, and p processes by direct measurements of important neutron capture reactions
Summary
Almost all of the heavy elements are produced via neutron capture reactions shared between s and r process [1,2,3] and to a very small extent by the i process [4, 5]. The crucial link between the observed abundances [6] and the desired parameters of the stellar interiors are nuclear reaction data. Like the investigation of time-reversed reactions, are very often the only choice because of the short half-lives of the investigated isotopes [10,11,12], this article is focussing on experimental developments aiming at a better understanding of the s, i, and p processes by direct measurements of important neutron capture reactions
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