COHERENT PAIR PRODUCTION IN CRYSTALS IN PRESENCE OF ACOUSTIC WAVES

2010 ◽  
Author(s):  
A. R. MKRTCHYAN ◽  
A. A. SAHARIAN ◽  
V. V. PARAZIAN
Keyword(s):  
Pair Production ◽  
Acoustic Waves ◽  
Coherent Pair

COHERENT PAIR PRODUCTION IN CRYSTALS IN PRESENCE OF ACOUSTIC WAVES

2010 ◽  
Vol 25 (supp01) ◽  
pp. 47-54
Author(s):  
A. R. MKRTCHYAN ◽  
A. A. SAHARIAN ◽  
V. V. PARAZIAN
Keyword(s):  
Single Crystal ◽  
Pair Production ◽  
Cross Section ◽  
Acoustic Waves ◽  
High Energy ◽  
Deformation Field ◽  
Crystallographic Axis ◽  
Electron Positron ◽  
Coherent Pair ◽  
Electron Positron Pair

Coherent electron-positron pair production by high-energy photons is investigated in a periodically deformed single crystal with a complex base. The formula for the corresponding differential cross-section is derived for an arbitrary deformation field. The conditions are specified under which the influence of the deformation is considerable. The case is considered in detail when the photon enters into the crystal at small angles with respect to a crystallographic axis. The results of the numerical calculations are presented for SiO 2 single crystal in the case of the deformation field generated by the acoustic wave of the S type. It is shown that, in dependence of the parameters, the presence of deformation can either enhance or reduce the pair creation cross-section.

scholarly journals ON THE THEORY OF COHERENT PAIR PRODUCTION IN CRYSTALS IN THE PRESENCE OF ACOUSTIC WAVES

2002 ◽  
Vol 17 (39) ◽  
pp. 2571-2580 ◽  
Author(s):  
A. R. MKRTCHYAN ◽  
A. A. SAHARIAN ◽  
L. SH. GRIGORYAN ◽  
B. V. KHACHATRYAN
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Acoustic Waves ◽  
High Energy ◽  
Pair Creation ◽  
Wave Number ◽  
Electron Positron ◽  
Coherent Pair ◽  
Electron Positron Pair ◽  
Coherent Part

The influence of hypersonic waves excited in a single crystal is investigated on the process of electron–positron pair creation by high-energy photons. The coherent part of the corresponding differential cross-section is derived as a function of the amplitude and wave number of the hypersound. The values of the parameters are specified for which the latter affects remarkably on the pair creation cross-section. It is shown that under certain conditions the presence of hypersonic waves can result in enhancement of the process cross-section.

scholarly journals New Analysis of the Two Competing Processes: Channeling-and Coherent Pair Production and a Discussion of Experimental Data

1985 ◽  
Vol 32 (2) ◽  
pp. 149-154 ◽  
Author(s):  
A H Sørensen ◽  
E Uggerhøj ◽  
J Bak ◽  
S P Møller
Keyword(s):  
Experimental Data ◽  
Pair Production ◽  
Coherent Pair

scholarly journals Coherent pair production in linear colliders

1989 ◽  
Vol 327 (2) ◽  
pp. 285-306 ◽  
Author(s):  
M. Jacob ◽  
Tai Tsun Wu
Keyword(s):  
Pair Production ◽  
Linear Colliders ◽  
Coherent Pair

A polarized photon beam produced by coherent pair production in oriented graphite

1973 ◽  
Vol 113 (4) ◽  
pp. 489-507 ◽  
Author(s):  
R.L. Eisele ◽  
D.J. Sherden ◽  
R.H. Siemann ◽  
C.K. Sinclair ◽  
D.J. Quinn ◽  
...  
Keyword(s):  
Pair Production ◽  
Photon Beam ◽  
Coherent Pair

Coherent pair production in axial alignment

1987 ◽  
Vol 124 (3) ◽  
pp. 191-194 ◽  
Author(s):  
Nelson Cue ◽  
J.C. Kimball
Keyword(s):  
Pair Production ◽  
Axial Alignment ◽  
Coherent Pair

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

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