Ivanov Yu M, Petrunin A A, Skorobogatov V V, Gavrikov Yu A, Gelamkov A V, Lapina L P, Schetkovsky A I, Vavilov S A, Baranov V I, Chesnokov Yu A, Afonin A G, Baranov V T, Chepegin V N, Guidi V, Scandale W, Vomiero A
Petersburg Nuclear Physics Institute, 188300 Gatchina, Leningral Region, Russia.
Phys Rev Lett. 2006 Oct 6;97(14):144801. doi: 10.1103/PhysRevLett.97.144801. Epub 2006 Oct 5.
Volume reflection predicted in the mid-1980s by Taratin and Vorobiev has been observed for the first time in the interactions of a 70 GeV proton beam with a short bent crystal. Incident protons deviate from convex atomic planes in the bulk of the crystal as a result of coherent interaction with bent lattice around the tangency point of particle trajectory with a curved atomic plane. The deflection angle 2theta(R) was found to be (39.5+/-2.0) microrad, or (1.65+/-0.08)theta(c) in terms of the critical angle for channeling. The process has a large probability with respect to channeling and takes place in the angular range equal to the bend angle of atomic planes. It could possibly open new fields of application of crystals in high-energy particle beam optics.
20世纪80年代中期塔拉廷和沃罗比耶夫预测的体反射首次在70 GeV质子束与短弯晶体的相互作用中被观测到。由于与粒子轨迹与弯曲原子平面的切点周围的弯曲晶格发生相干相互作用，入射质子会偏离晶体主体中的凸原子平面。发现偏转角2θ(R)为(39.5±2.0)微弧度，就沟道临界角而言为(1.65±0.08)θ(c)。该过程相对于沟道具有很大的概率，并且发生在等于原子平面弯曲角的角度范围内。它可能会为晶体在高能粒子束光学中的应用开辟新的领域。
