Measurement of the 234U(n,f) and 236U(n,f) cross-sections in the MeV region with MicroMegas detectors

Abstract

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Neutron induced reactions on Ir and Au and production of isomeric states

“…Therefore, secondary neutrons are produced by the 12 C(d,n) 13 N reaction. Moreover, as shown in previous publications [2], 2 H beam is implanted in the tritium target resulting in background neutrons from the 2 H(d,n) 4 He reaction [29,30]. It should be noted that although in the case of gas targets the contribution from these background neutrons can relatively easily be determined via gas-in/gas-out measurements, for solid targets the task to perform a blank measurement using a non tritium containing dummy target is a somewhat more demanding task [27].…”

“…Τέτοια νετρόνια µπορούν να προκύψουν µόνο από αντιδράσεις δύο-σωµατίων, γι αυτό στην πράξη εκτός από τα νετρόνια της κύριας ενέργειας παράγονται επιπλέον νετρόνια "υποβάθρου" [29]. Αυτά τα νετρόνια, αναφέρονται και ως παρασιτικά, ενώ ξεκινούν από ενέργειες ϑερµικών νετρονίων και ϕθάνουν έως µερικά MeV [30].…”

“…Monoenergetic neutrons can be produced by two-body reactions, however a practical source will not only produce these primary neutrons, but also "background" neutrons [29]. These neutrons can also be called "parasitic" and vary in energy from the thermal region up to a few MeVs [30].…”

“…Neutron producing reactions can also be performed when the deuteron beam interacts with materials of beam pipes, collimators and other surroundings. For example, parasitic neutrons can be produced via the 16 O(d,n) 17 F reaction, since 16 O nuclei are always present in the beam line due to oxidization processes [30].…”