Measurement of pair-production by high energy photons in an aligned tungsten crystal

A new measurement has been made of the rate of pair production in a 3.2 mm thick tungsten crystal, exposed to photons with energies in the range 10 to 150 GeV, for angles of incidence up to 10 mrad from the crystal axis. A strong enhancement of the pair-production rate is observed when the beam is a...

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Detalles Bibliográficos
Autores principales: Moore, R, Parker, M A, Baurichter, A, Kirsebom, K, Medenwaldt, R, Mikkelsen, U, Møller, S P, Uggerhøj, Erik, Worm, T, Doble, Niels T, Elsener, K, Ballestrero, S, Sona, P, Strakhovenko, V M, Biino, C, Vilakazi, Z Z
Lenguaje:eng
Publicado: 1995
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1016/0168-583X(96)00347-3
http://cds.cern.ch/record/290965
Descripción
Sumario:A new measurement has been made of the rate of pair production in a 3.2 mm thick tungsten crystal, exposed to photons with energies in the range 10 to 150 GeV, for angles of incidence up to 10 mrad from the crystal axis. A strong enhancement of the pair-production rate is observed when the beam is aligned along the <100> crystal axis, as compared to a random orientation. This effect can be exploited in the NA48 CP- violation experiment by using a thin crystal rather than an amorphous material to convert photons, thus minimising the scattering of kaons in the converter.

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