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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Production of a well collimated neutron beam using the associated particle technique

Tripard, Gerald Edward January 1967 (has links)
An accurately colliraated monenergetic fast neutron beam of small angular width was produced by bombarding a deuterium target with 2 MeV deuterons. Background reduction was achieved by using the associated particle technique and extensive shielding. Dual parameter pulse height analysis was used to reduce the coincidence time resolution between the detected neutrons and the associated He³ recoil particle to 4.6 nanoseconds by taking into account the variations in flight times of the He³ particles. A rotating thin film deuterated polyethylene target was developed which enabled a substantial increase in the neutron flux to be made. The beam of 70 neutrons/second/millisteradian produced, was of sufficient intensity to perform a small angle scattering experiment. The technique was tested by a measurement of the angular distribution from 40 degrees to 10 degrees of neutrons elastically scattered from lead. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
72

The dressing transformation and its application to a fermion-boson trilinear interaction

Hearn, Deborah Jean January 1981 (has links)
In this thesis, various fermion-boson strong interaction potentials are determined as functions of the basic fermion-boson trilinear vertex function. Working in Fock space, we note that the fermion-boson trilinear interaction does not explicitly involve physical particles. We develop a transformation, called the dressing transformation, which acts on the fundamental particle creators and annihilators. They are transformed into physical particle operators, and the invariance properties and commutation relations of the theory are preserved. A precise technique for perturbatively determining the dressing transformation is formulated, and is applied to some simple models in field theory. The dressing transformation makes explicit the physical particle interactions implicit in the original trilinear interaction. When applied to the nucleon-pion trilinear interaction, we find a nucleon mass renormalization, a nucleon-pion scattering term, and a nucleon-nucleon scattering term present in the second-order dressed Hamiltonian. Using the NN7C vertex function derived from the Cloudy Bag Model, the nucleon-nucleon coordinate space potential can be calculated. We discover that providing the two nucleons are separated by a distance greater than twice the bag radius, the potential between them is given by the one pion exchange potential modified in strength by a function of the bag radius. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
73

⁷Li(d,p)⁸Li excitation function :|bE[subscript d] = 0.623 MeV to 1.968 MeV

Schilling, Albert E. 01 April 1973 (has links)
In this study the excitation function for the ^7Li(d,p)^8Li reaction is determined at incident deuteron energies ranging from 0.623MeV to 1.968MeV by counting the delayed alpha-particles as a result of the ^8Li beta decay. This excitation function reveals resonances at 0.777±0.012MeV and 1.031±0.015MeV with cross sections of 202±9mb and 188±8mb respectively. The uncertainty in the cross section values was due to three independent sources of error within this experiment, the solid angle, the ^8Li half-life, and the target (LiF) thickness. The uncertainty in the energy values was determined from an energy calibration of the accelerator used in this study. Resonances from the ^71i(p,n)^7Be (1.882MeV), 7Li(d,p)^8Li (0.770MeV; 1.02MeV) and ^19F(p,αγ)^16 0 reactions were used in this energy calibration.
74

Nuclear charge distribution in the region of symmetric fission of 238U by protons of energy 20-85 MeV

Sarkar, Samir. January 1974 (has links)
No description available.
75

Recoil studies of (p, pn) reactions induced in 65CU and 197Au with 20-85 mev protons.

Dewanjee, Mrinal Kanti. January 1967 (has links)
No description available.
76

Nuclear charge distribution in the region of asymmetric fission of 238U by protons of energy 20-85 MeV

Galinier, Jean-Louis. January 1975 (has links)
No description available.
77

Fissionability and charge dispersion studies of thorium by protons of energy to 90 MeV

Chung, Chien January 1980 (has links)
Note:
78

A model for neutrino induced dimuon production /

Ziegler, Michael George January 1979 (has links)
No description available.
79

Measurement of total reaction cross sections in the mass range A = 45 to A = 65 /

Dell, George F. January 1962 (has links)
No description available.
80

Differential production cross-sections of low momentum particles from 12.3 BeV/c protons /

Marmer, Gary James January 1968 (has links)
No description available.

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