Distorted wave calculation of the positronium formation in positron-sodium and positron-potassium scattering

1998 ◽  
Vol 08 (04) ◽  
pp. 217-224
Author(s):  
K. B. Choudhury ◽  
M. Bhattacharya ◽  
N. C. Deb ◽  
N. R. Singh ◽  
M. B. Singh ◽  
...  
Keyword(s):  
Cross Sections ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Experimental Findings ◽  
Wave Calculation

Total cross sections for the positronium formation in the ground ( n =1) and excited ( n =2) states in e+ - Na and e+ - K scattering have been studied within the framework of a distorted wave approximation. The present results have been compared with other theoretical and experimental findings.

scholarly journals Ground State Positronium Formation Cross Sections for Scattering of Positrons from Li

1991 ◽  
Vol 44 (5) ◽  
pp. 515 ◽  
Author(s):  
KK Mukherjee ◽  
N Ranjit Singh ◽  
Keka Basu Choudhury ◽  
PS Mazumdar ◽  
S Brajamani
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Ground State ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Theoretical Predictions

Total cross sections for positronium formation in e+-Li scattering have been studied in the framework of the distorted wave approximation in the energy range 1-50 eV by taking consistent account of the effect of the target distortion. The results are compared with existing theoretical predictions.

scholarly journals Positronium Formation Cross Sections for Scattering of Positrons from Potassium and Rubidium

1994 ◽  
Vol 47 (3) ◽  
pp. 265
Author(s):  
N Ranjit Singh ◽  
NC Deb ◽  
Th Subodh Chandra Singh ◽  
M Babuyaima Singh ◽  
PS Mazumdar
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Positronium Formation ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Wave Approximation ◽  
Theoretical Results

Total cross sections for positronium formation in positron-potassium and positron-rubidium scattering have been calculated in a distorted wave approximation for incident positrons in the energy range 1 to 50 eV. The present results are compared with other theoretical results and with measurement where available.

scholarly journals Total Ionisation Cross Sections in e??H(2S) Scattering

1989 ◽  
Vol 42 (5) ◽  
pp. 475 ◽  
Author(s):  
KK Mukherjee ◽  
Keka Basu Choudhury ◽  
N Ranjit Singh ◽  
PS Mazumdar ◽  
S Brajamani
Keyword(s):  
Cross Sections ◽  
Atomic Hydrogen ◽  
Wave Method ◽  
Distorted Wave ◽  
Total Cross Sections ◽  
Theoretical Predictions ◽  
Impact Ionisation ◽  
Distorted Wave Method ◽  
Final Channel ◽  
Experimental Findings

Total cross sections for the electron impact ionisation from the 2S state of atomic hydrogen have been calculated in the energy range 5 �1-68 eV of the incident electron by using a rigorous distorted wave method in which the effects of both the initial and final channel distortions are taken into account. The present results show improved agreement with experimental findings in comparison with other theoretical predictions.

scholarly journals An Analytic Distorted Wave Approximation for Electropion and Photopion Production on 12C near Threshold

1986 ◽  
Vol 39 (2) ◽  
pp. 203 ◽  
Author(s):  
F Di Marzio ◽  
K Amos
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Distorted Wave ◽  
Pion Scattering ◽  
Wave Approximation ◽  
Microscopic Models ◽  
Transition Densities ◽  
Analyse Data ◽  
Near Threshold

An analytic distorted wave approximation (ADWA) that can be used to analyse photopion and electropion production cross sections is developed. An application is made to analyse data from 12C near threshold once the approximation scheme is established as a realistic replacement for the more usual, distorted wavefunctions given by the optical model for low energy pion scattering. The pion production data analyses made using a generalized Helm model for the transition densities clearly demonstrates the significant role of distortion effects and that the ADW A is a good and simple representation of these effects. Repeating the analyses using microscopic models of nuclear structure indicates inadequacies in those structure specifications.

First (n, p) measurements with the Indiana University Cyclotron Facility

1987 ◽  
Vol 65 (6) ◽  
pp. 687-690 ◽  
Author(s):  
D. Počanić ◽  
K. Wang ◽  
C. J. Martoff ◽  
S. S. Hanna ◽  
R. C. Byrd ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Beam ◽  
Cross Sections ◽  
Distorted Wave ◽  
Indiana University ◽  
Preliminary Results ◽  
Intermediate Energies ◽  
Set Up ◽  
Wave Calculation ◽  
Good Agreement

A new monochromatic neutron-beam facility has been set up at the Indiana University Cyclotron Facility, primarily for (n, p) reaction measurements at intermediate energies (100–200 MeV). Reported are the experimental layout of the facility and preliminary results of the first measurements: 6Li(n,p)6He cross sections at six angles ranging from Θcm = 0–22°, with En = 118 MeV (laboratory). Good agreement is found between the measured σ(0°) and the cross sections measured for the mirror reaction 6Li(p, n) at 120 and 144 MeV. Results of a distorted wave calculation, while slightly lower, are consistent with the preliminary experimental 0° cross section.

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