Eur. Phys. J. C (2020) 80: 63
https://doi.org/10.1140/epjc/s10052-019-7586-6

Regular Article - Experimental Physics

Broad angular anisotropy of multiple scattering in a Si crystal

¹ INFN Sezione di Ferrara, Via Saragat 1, 44124, Ferrara, Italy
² Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, 44124, Ferrara, Italy
³ Institute for Nuclear Problems, Belarusian State University, Bobruiskaya 11, 220030, Minsk, Belarus
⁴ Dipartimento di Fisica e Astronomia, Università di Padova, Via Marzolo 8, 35131, Padua, Italy
⁵ INFN Laboratori Nazionali di Legnaro, Viale dell’Università 2, 35020, Legnaro, Italy
⁶ INFN Sezione di Milano Bicocca, Piazza della Scienza 3, 20126, Milan, Italy
⁷ Università dell’Insubria, via Valleggio 11, 22100, Como, Italy
⁸ Institut für Kernphysik der Universität Mainz, 55099, Mainz, Germany
⁹ Dipartimento di Scienze Biomediche e Chirugico specialistiche, Università di Ferrara, Via Luigi Borsari 46, 44121, Ferrara, Italy

^* e-mail: sytov@fe.infn.it

Received: 24 May 2019
Accepted: 23 December 2019
Published online: 25 January 2020

Abstract

We observed reduction of multiple Coulomb scattering of 855 MeV electrons within a Si crystalline plate w.r.t. an amorphous plate with the same mass thickness. The reduction owed to complete or partial suppression of the coherent part of multiple scattering in a crystal vs crystal orientation with the beam. Experimental data were collected at Mainz Mikrotron and critically compared to theoretical predictions and Monte Carlo simulations. Our results highlighted maximal 7% reduction of the r.m.s. scattering angle at certain beam alignment with the [100] crystal axes. However, partial reduction was recorded over a wide range of alignment of the electron beam with the crystal up to 15. This evidence may be relevant to refine the modelling of multiple scattering in crystals for currently used software, which is interesting for detectors in nuclear, medical, high energy physics.