Positron–Helium Scattering Cross Sections and Phase Shifts Below 19 eV: Addendum

1974 ◽  
Vol 52 (11) ◽  
pp. 1047-1049 ◽  
Author(s):  
B. Jaduszliwer ◽  
D. A. L. Paul
Keyword(s):  
Cross Sections ◽  
Cross Correlation ◽  
Phase Shifts ◽  
Phase Shift Analysis ◽  
P Wave ◽  
S Wave ◽  
Wave Phase ◽  
Shift Analysis ◽  
Scattering Cross Sections ◽  
Phase Phase

We have extended the phase shift analysis of our positron–helium transmission experiments to determine the importance of cross correlation between the s and p wave phase shifts in a previous paper. We have found out that using Humberston's s wave phase shifts with suitably modified p and d wave phase shifts leads to as good a fit to our experimental data as Drachman's s wave phase phase shifts. Preliminary values of total cross section are given in the 19 to 27 eV energy region.

Positron–Helium Scattering Cross Sections and Phase Shifts below 19 eV

1973 ◽  
Vol 51 (14) ◽  
pp. 1565-1572 ◽  
Author(s):  
B. Jaduszliwer ◽  
D. A. L. Paul
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Phase Shifts ◽  
S Wave ◽  
Wave Phase ◽  
Entire Energy Range ◽  
Nice Agreement ◽  
Scattering Cross Sections ◽  
D Wave

The total cross sections for elastic scattering of positrons in the energy range from 4 to 19 eV have been measured by the method of transmission. By varying a magnetic field applied along the axis of the scattering chamber the transmitted fraction of the beam is altered, from which individual phase shifts can be extracted. s-, p-, and d-wave phase shifts are given over the entire energy range. The s-wave phase shifts are in agreement with values published by Drachman in 1968, while the p- and d-wave phase shifts are intermediate between values calculated by the same author in 1966 and 1971. The experimental results agree with those of Costello et al., and marginally with our own 1972 results, but are significantly different from those of Canter et al. We compute that the Ramsauer minimum in the diffusion cross section must be 0.04πa02 at 1.6 eV while the minimum in the total cross section is 0.11πa02 at 2.1 eV. The shoulder breadth observed in annihilation experiments is in nice agreement with what one would predict from our phase shifts.

scholarly journals Scattering Cross Sections in Argon from Electron Transport Parameters

1982 ◽  
Vol 35 (1) ◽  
pp. 35 ◽  
Author(s):  
GN Haddad ◽  
TF O'Malley
Keyword(s):  
Phase Shift ◽  
Cross Section ◽  
Cross Sections ◽  
Lateral Diffusion ◽  
Phase Shifts ◽  
P Wave ◽  
Transport Parameters ◽  
S Wave ◽  
Wave Phase ◽  
Range Theory

Previously determined experimental drift velocities Vdr and ratios of lateral diffusion coefficient to mobility DT/µ have been refitted directly with a three parameter modified effective range theory (MER T) representation of the S wave phase shift, a one parameter fit to the P wave phase shift and fixed higher partial wave phase shifts. The MERT representation now extends to 1·0 eV, a threefold extension of the energy range of the MERT fit reported by Milloy et al. (1977). The total cross section derived from the phase shifts is also reported, together with the differential cross section at 1·0 eV which is compared with a previous experimental determination.

KN s-wave phase shifts in the non-relativistic quark model

1995 ◽  
Vol 589 (4) ◽  
pp. 585-600 ◽  
Author(s):  
B. Silvestre-Brac ◽  
J. Leandri ◽  
J. Labarsouque
Keyword(s):  
Quark Model ◽  
Phase Shifts ◽  
Relativistic Quark Model ◽  
S Wave ◽  
Wave Phase

PION-NUCLEON SCATTERING EXPERIMENTS AT LOW ENERGIES: π-p→π0n TOTAL CROSS SECTIONS

2005 ◽  
Vol 20 (08n09) ◽  
pp. 1818-1821
Author(s):  
J. BREITSCHOPF ◽  
M. BAUER ◽  
H. CLEMENT ◽  
M. CRÖNI ◽  
H. DENZ ◽  
...  
Keyword(s):  
Phase Shift ◽  
Cross Sections ◽  
Phase Shift Analysis ◽  
Single Charge ◽  
Charge Exchange Reaction ◽  
Total Cross Sections ◽  
Transmission Technique ◽  
Shift Analysis ◽  
Low Energies ◽  
Pion Nucleon

Total cross sections of the single charge exchange reaction π-p→π0n have been measured at PSI from about 40 to 250 MeV using a transmission technique. Preliminary results show an excellent agreement with predictions from the SAID FA02 phase shift analysis for energies above 70 MeV.

THE REACTION D(p, γ)He3 BELOW 50 KEV

1963 ◽  
Vol 41 (5) ◽  
pp. 724-736 ◽  
Author(s):  
G. M. Griffiths ◽  
M. Lal ◽  
C. D. Scarfe
Keyword(s):  
Angular Distribution ◽  
Cross Sections ◽  
Center Of Mass ◽  
P Wave ◽  
Laboratory System ◽  
S Wave ◽  
Mass System ◽  
S Factor ◽  
Low Energies ◽  
Γ Rays

The yield and angular distribution of the γ rays from the reaction D(p, γ) He3 have been measured with thick heavy-ice targets in the energy range from 24 kev to 48 kev. Assuming a simplified energy dependence the results have been analyzed to give cross sections for p-wave and s-wave capture. At 25 kev in the laboratory system, the cross sections are[Formula: see text]The astrophysical S-factors in the center-of-mass system below 40 kev have been found to be[Formula: see text]for E in center-of-mass kilovolts and[Formula: see text]independent of energy giving a total S-factor for low energies[Formula: see text]with E in center-of-mass kilovolts.

Positron–hydrogen scattering with quadratic variational methods

1982 ◽  
Vol 60 (4) ◽  
pp. 577-580 ◽  
Author(s):  
M. A. Abdel-Raouf
Keyword(s):  
Elastic Scattering ◽  
Variational Methods ◽  
Phase Shifts ◽  
S Wave ◽  
Variational Techniques ◽  
Wave Phase

New variational techniques in which the functional [Formula: see text] is minimized are used to calculate the S-wave phase shifts of e+–H elastic scattering. The convergence of these phases, as n increases, is precisely investigated.

Differential cross sections and phase shift analysis ofHe3(p, p)He3between 18.0 and 57 MeV

1975 ◽  
Vol 11 (6) ◽  
pp. 1905-1912 ◽  
Author(s):  
J. R. Morales ◽  
T. A. Cahill ◽  
D. J. Shadoan ◽  
H. Willmes
Keyword(s):  
Phase Shift ◽  
Cross Sections ◽  
Differential Cross ◽  
Phase Shift Analysis ◽  
Differential Cross Sections ◽  
Shift Analysis
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