Angular Distributions of 22-Mev Protons Elastically Scattered by Various Elements

1954 ◽  
Vol 93 (2) ◽  
pp. 282-287 ◽  
Author(s):  
Bernard L. Cohen ◽  
Rodger V. Neidigh
Keyword(s):  
Angular Distributions ◽  
Mev Protons

scholarly journals The scattering of 4·2 MeV protons by deuterium, helium and other light elements

1947 ◽  
Vol 190 (1021) ◽  
pp. 180-195 ◽  
Keyword(s):  
Angular Distribution ◽  
Elastic Scattering ◽  
Scattered Wave ◽  
Angular Distributions ◽  
Light Elements ◽  
Coulomb Term ◽  
Collision Processes ◽  
Mev Protons

The methods previously described have been applied to a study of the elastic scattering of 4·2 MeV protons by deuterium, helium, nitrogen, oxygen, neon, argon, chlorine and bromine. The results obtained with deuterium and helium as the scattering gases are compared with those of other experimenters working with protons of different energies. The angular distributions of the protons elastically scattered by nitrogen and oxygen, together with the results for carbon obtained in previous measurements, can be simply described in terms of an S -component interacting with the Coulomb term in the formula for the scattered wave. Values are obtained in each case for the magnitude of the parameter which defines the amplitude and phase of the S -wave. The angular distribution of the protons inelastically scattered by neon has been investigated and evidence obtained for similar collision processes in experiments with argon and chlorine.

scholarly journals Simulation of a CME-driven shock by anisotropic scattering angular distributions

2012 ◽  
Vol 8 (S294) ◽  
pp. 583-584
Author(s):  
Xin Wang ◽  
Yi-Hua Yan
Keyword(s):  
Monte Carlo Simulation ◽  
Cosmic Ray ◽  
Interplanetary Shock ◽  
Anisotropic Scattering ◽  
Particle Energy ◽  
Angular Distributions ◽  
Shock Acceleration ◽  
Diffusive Shock Acceleration ◽  
Mass Ejection ◽  
Mev Protons

AbstractObservations of the interplanetary shock provide us with strong evidences of particle acceleration to multi-MeV protons in a coronal mass ejection (CME). Diffusive shock acceleration (DSA) is an efficient mechanism for cosmic ray (CR). This work presents a dynamical Monte Carlo simulation of a CME-driven shock on 14-Dec-2006 by using a series of Gaussian scattering angular distributions. With the simulated results, we find that particle energy spectrum is affected by energy injection processes under the anisotropic scattering law.

OBSERVATION OF INTERFERENCE BETWEEN ATOMIC BREMSSTRAHLUNG AND NUCLEAR BREMSSTRAHLUNG

1999 ◽  
Vol 09 (01n02) ◽  
pp. 1-10 ◽  
Author(s):  
K. ISHII ◽  
T. SATOH ◽  
S. MATSUYAMA ◽  
H. YAMAZAKI ◽  
Y. TOKAI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Energy Region ◽  
Production Cross ◽  
Angular Distributions ◽  
X Rays ◽  
Beam Direction ◽  
Aluminum Target ◽  
X Ray ◽  
Wide Range ◽  
Mev Protons

An aluminum target was bombarded with 1.5 MeV protons and continuous x-rays were measured at the angles of 45°, 90° and 135° with respect to the beam direction. By investigating the shape of the x-ray energy spectrum, it was recognized that, the continuous x-rays below 12 keV are atomic bremsstrahlung (AB) and those of above 12 keV are nuclear bremsstrahlung (NB), and AB and NB are mingled in the energy region of around 12 keV The x-ray energy dependence of angular distributions presented well a change from the process of AB to that of NB in the continuous x-ray spectrum. Interference between AB and NB were discussed on the basis of PWBA theory. Continuous x-ray production cross sections were calculated on the basis of PWBA BEA and a semi-classical theory and compared with the experimental results. The theoretical prediction reproduced well the experimental cross sections over the wide range of 6 orders in magnitude and of 2 keV – 35 keV in the energy except for the energy region mingled with AB and NB. The ratio of the theoretical cross sections to the experimental ones showed an interference effect between AB and NB in their mingled region.

ELASTIC SCATTERING OF 20-MEV. PROTONS BY OXYGEN AND NITROGEN

1957 ◽  
Vol 35 (2) ◽  
pp. 184-194 ◽  
Author(s):  
R. H. Chow ◽  
Byron T. Wright
Keyword(s):  
Elastic Scattering ◽  
Los Angeles ◽  
Cross Sections ◽  
University Of California ◽  
Angular Distributions ◽  
Diffraction Effect ◽  
Laboratory System ◽  
External Beam ◽  
The University ◽  
Mev Protons

The absolute angular distributions for 20-Mev. protons elastically scattered by O16 and N14 were determined using the external beam of the frequency-modulated cyclotron at the University of California, Los Angeles. The distributions for the two elements were found to be similar except for the appearance of a more pronounced first minimum in the O16 distribution. The locations of the maxima and minima seem to indicate that simple diffraction effect is responsible for their presence. The cross sections range from about 1 barn per sterad. to 4 mb. per sterad. between 15° and 165° in the laboratory system. The standard deviations due to statistics range from [Formula: see text] to 10%.

Direct evidence for mixing of two-quasiproton and two-quasineutron configurations in 172Yb

1982 ◽  
Vol 60 (12) ◽  
pp. 1751-1758 ◽  
Author(s):  
D. G. Burke ◽  
J. W. Blezius
Keyword(s):  
Alpha Particle ◽  
Magnetic Moment ◽  
Direct Evidence ◽  
Angular Distributions ◽  
Reaction Products ◽  
Mixing Ratios ◽  
Absolute Intensities ◽  
Photographic Emulsions ◽  
Quantitative Explanation ◽  
Mev Protons

The 175Lu(p,α)172Yb reaction has been studied using beams of 17 MeV protons from the McMaster University tandem Van de Graaff accelerator. The alpha particle reaction products were analyzed with a magnetic spectrograph and detected with photographic emulsions. Levels up to an excitation energy of 2.8 MeV were studied with a resolution of 20 keV FWHM. The spin 3, 4, 5, and 6 members of the Kπ = 3+ band at 1172 keV were populated appreciably, indicating the existence of a significant two-quasiproton admixture in this band. The measured angular distributions and relative intensities within the band are consistent only with a Kπ = 3+, {7/2+ [404] − 1/2+ [411]} configuration for this admixture, and the absolute intensities indicate that it makes up (27 ± 10)% of the state. This observation provides a quantitative explanation for the observed magnetic moment of the 1172 keV level and also for the observed E2–M1 mixing ratios within the band. It may also be important in the explanation of other anomalous properties of this band. The present measurements also show large Kπ = 3+, {7/2+ [404] − 1/2+ [411]} admixtures in the previously assigned Kπ = 2+ band at 1609 keV and the Kπ = 3+ band at 1663 keV. In addition, the assignment of the 2073 and 2192 keV levels as Iπ = 4+ and 5+ members of a Kπ = 4+, {7/2+ [404] + 1/2+[411]} band has been confirmed.

The 149,151Sm(p,t)147,149Sm Reactions

1973 ◽  
Vol 51 (2) ◽  
pp. 203-208 ◽  
Author(s):  
R. D. Gadsby ◽  
D. G. Burke ◽  
J. C. Waddington
Keyword(s):  
Ground State ◽  
Angular Distributions ◽  
Neutron Transfer ◽  
Transfer Data ◽  
Final Nucleus ◽  
Mev Protons

Two-neutron pickup reactions have been performed on targets of 149Sm and radioactive 151Sm using 18 MeV protons. The outgoing tritons from the 151Sm target were analyzed with a magnetic spectrograph at 16 angles between 6 and 80°. Unlike the two-neutron transfer data on neighboring even–even targets, the angular distributions indicated l = 0 transitions to many levels in the final nucleus. Partial angular distributions for the 149Sm(p,t)147Sm reaction were obtained, but showed only one strong l = 0 transition populating the 147Sm ground state. In addition, spectra from the 152Sm(p,t) reaction were measured at several angles in order to provide normalization to previous results.

Inelastic scattering of 100 MeV protons from 12C using a Ge(Li) total-absorption proton counter

1970 ◽  
Vol 48 (2) ◽  
pp. 201-210 ◽  
Author(s):  
Y. S. Horowitz ◽  
R. E. Bell
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Energy Analysis ◽  
Intermediate Energy ◽  
Scattering Data ◽  
Angular Distributions ◽  
Total Absorption ◽  
Natural Carbon ◽  
Mev Protons ◽  
Qualitative Discussion

A cooled Ge(Li) detector has been used as a total-absorption proton counter for the energy analysis of 100 MeV protons scattered from a target of natural carbon. An overall energy resolution of 0.5 MeV to 0.6 MeV (FWHM) was achieved. The differential cross sections for the excitation of the 4.43, 7.66, 9.64, 10.8, 11.8, 12.7, 14.1, 15.1, and 16.1 MeV levels have been measured at nine angles from 10 to 60° (lab). The angular distributions for the 10.8, 11.8, and 14.1 MeV levels represent the first measured proton-scattering data for these levels in the intermediate energy region (> 50 MeV). A qualitative discussion of the excited states is presented, based mainly on the shapes of the angular distributions. At large scattering angles (> 30°), the angular distribution for the 0+ level at 7.66 MeV deviates significantly from 0+ angular distributions measured in 24Mg and 28Si, suggesting different mechanisms of excitation of 0+ states in the p and s–d shells.

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