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

R. Moore, M. A. Parker*, A. Baurichter, K. Kirsebom, R. Medenwaldt, U. Mikkelsen, S. P. Møller, E. Uggerhøj, T. Worm, N. Doble, K. Elsener, S. Ballestrero, P. Sona, V. M. Strakhovenko, C. Biino, Z. Z. Vilakazi

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review


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.

Original languageEnglish
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Pages (from-to)149-155
Number of pages7
Publication statusPublished - Oct 1996


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