Experimental and numerical characterization of the neutron field produced in the n@BTF Frascati photo-neutron source

R. Bedogni (a,n), L. Quintieri (a), B. Buonomo (a), A. Esposito a, G. Mazzitelli (a), L. Foggetta (a), J.M. Go ́ mez-Ros (a,b)

a) INFN—LNF (Laboratori Nazionali di Frascati), Via E. Fermi n. 40,00044 Frascati (RM), Italy
b) CIEMAT, Av. Complutense 22, E-28040 Madrid, Spain

A photo-neutron irradiation facility is going to be established at the Frascati National Laboratories of INFN on the base of the successful results of the n@BTF experiment. The photo-neutron source is obtained by an electron or positron pulsed beam, tuneable in energy, current and in time structure, impinging on an optimized tungsten target located in a polyethylene–lead shielding assembly. The resulting neutron field, through selectable collimated apertures at different angles, is released into a 100 m2 irradiation room. The neutron beam, characterized by an evaporation spectrum peaked at about 1 MeV, can be used in nuclear physics, material science, calibration of neutron detectors, studies of neutron hardness, ageing and study of single event effect. The intensity of the neutron beam obtainable with 510 MeV electrons and its fluence energy distribution at a point of reference in the irradiation room were predicted by Monte Carlo simulations and experimentally determined with a Bonner Sphere Spectrometer (BSS). Due to the large photon contribution and the pulsed time structure of the beam, passive photon-insensitive thermal neutron detectors were used as sensitive elements of the BSS. For this purpose, a set of Dy activation foils was used. This paper presents the numerical simulations and the measurements, and compares their results in terms of both neutron spectrum and total neutron fluence.

Please cite this article as: R. Bedogni, et al., Nucl. Instr. and Meth. A (2011), doi:10.1016/j.nima.2011.08.032

Informazioni su Giovanni Mazzitelli

Senior Researcher - field of interest high energy physics and particle accelerators; science communication and education; sail and alpinism lover
Questa voce è stata pubblicata in News. Contrassegna il permalink.


Inserisci i tuoi dati qui sotto o clicca su un'icona per effettuare l'accesso:

Logo WordPress.com

Stai commentando usando il tuo account WordPress.com. Chiudi sessione /  Modifica )

Google+ photo

Stai commentando usando il tuo account Google+. Chiudi sessione /  Modifica )

Foto Twitter

Stai commentando usando il tuo account Twitter. Chiudi sessione /  Modifica )

Foto di Facebook

Stai commentando usando il tuo account Facebook. Chiudi sessione /  Modifica )


Connessione a %s...