Beta decay of polarized Λ hyperons III. Correlations in the Λ centre-of-mass system and the proton recoil spectrum

A method is described for determining the orientation of proton tracks in a photographic emulsion with an accuracy of ± 1°. This technical development increases the range of application of the photographic method to problems in nuclear physics. The method has been applied to an investigation of the scattering of 8.8 and 13.0 MeV neutrons by protons. If I ( ɸ ) is the intensity per unit solid angle of the scattered neutrons in the centre of mass co-ordinate system of the colliding particles, the measurements give values of I ( ɸ ) in the range from ɸ = π to ɸ = 1/2 π . When this range in the value of ɸ is divided into five equal intervals, the observed numbers of tracks in the different intervals are consistent with the scattering being isotropic in the centre of mass system to within the limits of the statistical error, for the 8.8 MeV group of neutrons. There is some evidence for a periodic fluctuation of high order in the angular distribution of the scattered intensity which remains to be confirmed. For the 13 MeV group the ratio of I ( π )/ I (1/2 π ) is found to be 0.67 ± 0.20. The neutrons employed in this experiment were produced by bombarding boron with 600 keV deuterons and arise from the reaction B 11 ( d, n ) C 12 . There is evidence that the excited state of C 12 at 4.5 MeV is complex.

Download Full-text

The proton recoil spectrum of thermal neutrons decaying in vacuum

Zeitschrift für Physik A Hadrons and Nuclei ◽

10.1007/bf01392781 ◽

1969 ◽

Vol 226 (1) ◽

pp. 17-27 ◽

Cited By ~ 3

Author(s):

O. Nachtmann ◽

H. Paul

Keyword(s):

Thermal Neutrons ◽

Proton Recoil ◽

Recoil Spectrum

Download Full-text

Neutron elastic and inelastic differential scattering cross-sections by proton recoil spectrum unfolding

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/0168-9002(85)91030-7 ◽

1985 ◽

Vol 238 (1) ◽

pp. 83-93 ◽

Cited By ~ 3

Author(s):

M.N. Erduran ◽

R.B. Galloway

Keyword(s):

Cross Sections ◽

Scattering Cross ◽

Spectrum Unfolding ◽

Proton Recoil ◽

Recoil Spectrum ◽

Scattering Cross Sections

Download Full-text

Studies of nuclear collisions involving 8 MeV deuterons by the photographic method III. Angular distribution of the charged particles produced by the bombardment of hydrogen and deuterium

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1951.0221 ◽

1951 ◽

Vol 209 (1099) ◽

pp. 489-501 ◽

Cited By ~ 9

Keyword(s):

Angular Distribution ◽

Cross Section ◽

Cross Sections ◽

Charged Particles ◽

Elastic Collision ◽

Angular Distributions ◽

Centre Of Mass ◽

Mass System ◽

Nuclear Collisions ◽

Nuclear Processes

Apparatus previously described has been used to study the angular distribution of the charged particles from nuclear processes initiated by 8 MeV deuterons. The experimental technique and the method of obtaining relative values of the yield at different angles in the centre-of-mass system are described. Results of measurements on the elastic collision of deuterons with protons are given, together with an account of the method for obtaining absolute values of cross-sections from the relative values, using the known cross-section for this process measured by other experimenters. Angular distributions obtained for deuterons elastically scattered by deuterons, and for protons from the reaction 2 H ( d , p ) 3 H, are produced, and their interpretation discussed.

Download Full-text

The cross-sections and angular distributions of the D—D reactions between 150 and 450 keV

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1954.0249 ◽

1954 ◽

Vol 226 (1165) ◽

pp. 206-216 ◽

Cited By ~ 32

Keyword(s):

Cross Section ◽

Cross Sections ◽

Deuteron Beam ◽

Angular Distributions ◽

Centre Of Mass ◽

Mass System ◽

Gas Target ◽

Neutron Reaction ◽

The Cross ◽

Bombarding Energy

A thin gas target was used and the 3 He and 3 H particles from the reactions were counted in two proportional counters which were rotated to make angles between 20 and 135° (in the centre-of-mass system) with the incident deuteron beam. In contradiction to data previously published for this energy range, the angular distributions of the reactions are different, the asymmetry of the neutron-producing reaction being the greater. The total cross-section of the neutron reaction is greater than that of the proton reaction; the ratio of the cross-sections increases with bombarding energy.

Download Full-text

Short-range and long-range correlations in cosmic ray interactions

Canadian Journal of Physics ◽

10.1139/p84-062 ◽

1984 ◽

Vol 62 (5) ◽

pp. 442-445 ◽

Cited By ~ 3

Author(s):

R. Hasan ◽

M. Q. R. Khan ◽

M. S. Ahmad ◽

M. S. Swami

Keyword(s):

Long Range ◽

Short Range ◽

Cosmic Ray ◽

Nucleon Nucleon ◽

Centre Of Mass ◽

Mass System ◽

Long Range Correlations ◽

Cosmic Ray Interactions ◽

Nucleon Interactions

Forward–backward correlations in the centre of mass system have been studied in nucleon–nucleon interactions at cosmic ray energies [Formula: see text]. The study indicates the presence of short-range as well as long-range correlations. The study also indicates the production of heavy clusters, predicted by Adamovich et al. in their multiperipheral model, in cosmic ray interactions.

Download Full-text