Incident-Energy Dependent Quenching of the Analyzing Power in Pre-Equilibrium Composite Particle Emission

2011 ◽  
Author(s):  
A. A. Cowley ◽  
S. S. Dimitrova ◽  
J. J. van Zyl ◽  
Paraskevi Demetriou ◽  
Rauno Julin ◽  
...  
Keyword(s):  
Incident Energy ◽  
Composite Particle ◽  
Particle Emission ◽  
Energy Dependent ◽  
Analyzing Power

Reaction mechanism of proton-induced pre-equilibrium α-particle emission from medium-mass nuclei at incident energies between 65 and 160MeV

2018 ◽  
Vol 27 (11) ◽  
pp. 1850091 ◽  
Author(s):  
S. S. Dimitrova ◽  
A. A. Cowley ◽  
E. V. Zemlyanaya ◽  
K. V. Lukyanov
Keyword(s):  
Reaction Mechanism ◽  
Composite Particle ◽  
Particle Emission ◽  
Angular Distributions ◽  
Medium Mass ◽  
Multistep Process ◽  
Equilibrium Emission ◽  
Analyzing Power

The intrinsic reaction mechanism of proton-induced composite particle pre-equilibrium emission is well known to be a statistical multistep process. However, until recently it was still not clear how important the competition between pickup and knockout is to produce a composite ejectile in the multistep sequence. An evaluation of recent ([Formula: see text]) results at incident energies from 65 to 160[Formula: see text]MeV and on representative target nuclei is presented. The virtue of analyzing power angular distributions to unravel the details of the reaction mechanism is discussed and future possible avenues of investigation are explored.

scholarly journals Proton-induced pre-equilibrium composite-particle emission

2018 ◽  
Vol 194 ◽  
pp. 07001 ◽  
Author(s):  
Anthony Cowley
Keyword(s):  
Reaction Mechanism ◽  
Composite Particle ◽  
Particle Emission ◽  
Multistep Process ◽  
Equilibrium Emission ◽  
Analyzing Power

The reaction mechanism of proton-induced composite particle pre-equilibrium emission as an intrinsic part a statistical multistep process was confirmed long ago. Nevertheless, until fairly recently it was still not clear how pickup and knockout processes compete in the multistep sequence to produce a composite ejectiles. An overview of results and conclusions based on recent (p,α) studies at incident energies from 65 to 200 MeV are presented and evaluated. It is shown how analyzing power is a valuable observable for unravelling the details of the reaction mechanism. Future avenues of investigation are discussed.

Determining the energy-dependent X-ray flux variation of a synchrotron beamline using Laue diffraction patterns

2011 ◽  
Vol 44 (1) ◽  
pp. 177-183 ◽  
Author(s):  
Catherine Dejoie ◽  
Martin Kunz ◽  
Nobumichi Tamura ◽  
Colin Bousige ◽  
Kai Chen ◽  
...  
Keyword(s):  
Incident Energy ◽  
Flux Variation ◽  
Laue Diffraction ◽  
X Ray ◽  
Measured Flux ◽  
Highly Sensitive ◽  
Diffraction Patterns ◽  
Energy Dependent ◽  
Flux Curve

Although the spectrum originating from a superconducting bending magnet is quasi-continuous, it shows important intensity variations through its spectral range. A method to determine the incident energy-dependent flux variation based on the comparison between observed intensities and the calculated intensities of a well known structure (calcite) is presented here. It is found that the measured flux is highly sensitive to the use of correct Debye–Waller factors for the atoms of the standard crystal. By using the measured flux curve, it was possible to unambiguously index the Laue diffraction pattern of a trigonal crystal structure in its hexagonal setting. This is a crucial but difficult first step for the determination of strain and stress in materials with this symmetry, such as quartz, Mg, Ti, Znetc.

On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A· MeV

1999 ◽  
Vol 6 (2) ◽  
pp. 185-195 ◽  
Author(s):  
R. Kotte ◽  
◽  
H. W. Barz ◽  
W. Neubert ◽  
C. Plettner ◽  
...  
Keyword(s):  
Composite Particle ◽  
Heavy Ion ◽  
Space Time ◽  
Particle Emission ◽  
Time Difference ◽  
Heavy Ion Reactions

scholarly journals Recent insight into the mechanism of proton-induced composite particle emission in inclusive reactions

2016 ◽  
Vol 107 ◽  
pp. 08004 ◽  
Author(s):  
A.A. Cowley ◽  
S.S. Dimitrova ◽  
E.V. Zemlyanaya ◽  
K.V. Lukyanov ◽  
J.J. van Zyl
Keyword(s):  
Composite Particle ◽  
Particle Emission ◽  
Insight Into ◽  
Recent Insight
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