Abstract
The inelastic neutron acceleration (INNA) cross section on the long-lived isomer state of 177m Lu has been measured from a new isomeric target using a direct method. The detection of high energy neutrons has been performed using a specially designed setup and a cold neutron beam at the ORPHEE reactor facility in Saclay.
Highlights
Super-elastic neutron scattering, called inelastic neutron acceleration (INNA), occurs during the collision of a neutron with an excited nucleus
Due to the usually high cross section of the thermal neutron interaction, such a process could be used to induce a fast de-excitation of an isomer
We report on experimental results on the direct measurement of high energy neutrons in the reaction between the long-lived isomer of 177mLu and cold neutrons at the ORPHEE reactor facility
Summary
Super-elastic neutron scattering, called inelastic neutron acceleration (INNA), occurs during the collision of a neutron with an excited nucleus. In this reaction, the nucleus transfers some of its excitation energy to the scattered neutron. Predicted [1] since 1959, this process was observed twenty years later on two isomeric nuclei [2] [3] The effect of this neutron induced de-excitation is known in nuclear astrophysics to take place in the s-process nucleosynthesis [4]. Due to the usually high cross section of the thermal neutron interaction, such a process could be used to induce a fast de-excitation of an isomer. From the previously published value of the INNA cross section and from these measurements, we discuss the relevance of these latter results
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