Abstract
Reactions involving short-lived nuclei play an important role in nuclear astrophysics, especially in explosive scenarios which occur in novae, supernovae or X-ray bursts. This article describes the nuclear astrophysics program with radioactive ion beams at the ATLAS accelerator at Argonne National Laboratory. The CARIBU facility as well as recent improvements for the in-flight technique are discussed. New detectors which are important for studies of the rapid proton or the rapid neutron-capture processes are described. At the end we briefly mention plans for future upgrades to enhance the intensity, purity and the range of in-flight and CARIBU beams.
Highlights
Reactions involving short-lived nuclei play an important role in nuclear astrophysics, especially in explosive scenarios which occur in novae, supernovae or X-ray bursts
Nuclear astrophysics experiments with stable beams have been studied for many years and first measurements of cross sections reaching energies in the Gamow window for quiescent stellar burning processes have been performed.[1]
The development of radioactive beams during the last two to three decades has opened the possibility to study reactions which are of importance to explosive burning processes, where proton and α-induced reactions on unstable nuclei have to be taken into account
Summary
Nuclear astrophysics experiments with stable beams have been studied for many years and first measurements of cross sections reaching energies in the Gamow window for quiescent stellar burning processes have been performed.[1]. At the Argonne Tandem Linac Accelerator System (ATLAS) astrophysics experiments with radioactive beams have been performed for about two decades starting with a 18F beam for a measurement of the 18F(p,α)15O reaction.[4] The first beams were produced with the ’two-accelerator method’[3] and were limited to isotopes with longer half-lives.[4,5,6] The in-flight method on the other hand, gave us access to more than 100 short-lived isotopes in the mass range up to A∼60 Over the years this technique has been refined by making use of the unique time structure of the ATLAS accelerator to improve the energy resolution and the purity of the secondary beams.
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