HEP-Astro Seminar | Recent Developments and Applications of Improved Fast Neutron Detectors
Fred Becchetti (U-M Physics)
Neutrons are hard to detect and until recently the technique used by Chadwick to identify the neutron in the 1930s has often been used to detect them. This method, based on recoil proton detection, does not provide detailed information on the neutron energy spectra unless one can do a neutron time-of-flight measurement (n-ToF). This is not always possible especially with the new generation of low b.g. underground accelerators designed for nuclear-astrophysics measurements.. Even when n-ToF is feasible, it often is not very efficient as a long flight path must typically be used together with a bunched and pulse-selected beam . Recent developments in deuterated scintillators, both liquids and recently crystalline, can provide efficient detection of neutrons and their energy spectra w/o n-ToF. As will be illustrated, these new detectors are proving to be especially useful for study of many types of rare nuclear reactions, for home-land security applications, for ion-beam dosimetry, and for measurements of important reactions creating problematic neutrons in the large scintillators used for neutrino oscillation measurements and for dark-matter searches.
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