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.
Highlights
Knowledge of neutron-induced reaction rates is indispensable for nuclear structure and nuclear astrophysics as well as for a broad range of applications, where the obvious example of the latter is the reactor physics
In nuclear astrophysics the neutrons with energies between 1 keV and 1 MeV play the most essential role since this energy range corresponds to temperature regimes relevant for nucleosynthesis processes in stellar objects
In this context ðn; γÞ cross sections for unstable isotopes are requested for the s process [1], related to stellar helium burning, as well as for the r [2] and p processes [3], related to explosive nucleosynthesis in supernovae
Summary
Knowledge of neutron-induced reaction rates is indispensable for nuclear structure and nuclear astrophysics as well as for a broad range of applications, where the obvious example of the latter is the reactor physics. In nuclear astrophysics the neutrons with energies between 1 keV and 1 MeV play the most essential role since this energy range corresponds to temperature regimes relevant for nucleosynthesis processes in stellar objects In this context ðn; γÞ cross sections for unstable isotopes are requested for the s process [1], related to stellar helium burning, as well as for the r [2] and p processes [3], related to explosive nucleosynthesis in supernovae. The challenge for ðn; γÞ data is linked to the freeze-out of the final abundance pattern, when the remaining free neutrons are captured as the temperature drops below the neutron separation energy [5] Since many of these nuclei are too short-lived to be accessed by direct measurements [6], it is, essential to obtain as much experimental information as possible off the stability line in order to assist theoretical extrapolations of nuclear properties towards the drip lines. Such short-lived isotopes can currently not be directly investigated
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