Physics & Astronomy ETDs
Publication Date
12-19-1975
Abstract
The neutron-momentum spectra at 0° resulting from proton bombardment of 9Be, 12C, and 27Al at Tp=633MeV, and those of 12C and 27Al at Tp=786 MeV, have been measured at the LAMPF (Los Alamos Meson Physics Facility)-Nucleon Physics Laboratory.
The measurements utilized the recently developed single arm, multiwire proportional counter, recoil-proton, magnetic spectrometer. I
dentification of the recoil charged particles was achieved through momentum analysis and simultaneous timeof-flight determination for each particle constituting a valid event.
The momentum and energy resolutions achieved are about 1% and 1.4%, respectively, at the incident proton energies considered.
The spectra for 9Be and 27Al exhibit a narrow and intense high-energy peak due to charge exchange. This peak is reduced in the case of 12C. There is evidence for the existence of some structure 20-30 MeV below the charge-exchange peak, probably due to some collective excitation mode of the target nucleus.
All spectra exhibit a second, much broader, peak at intermediate energies due to neutrons associated with pion production. This region of the spectrum is compared in shape and magnitude to the neutron spectrum resulting from the reaction pp -> nppi+, which has been recently measured using the same spectrometer.
The results are compared to those of some previous experimental efforts on the subject and to those predicted by the Brookhaven Intranuclear Cascade Code.
Degree Name
Physics
Level of Degree
Doctoral
Department Name
Physics & Astronomy
First Committee Member (Chair)
Christopher Pratt Leavitt
Second Committee Member
Byron Dale Dieterle
Third Committee Member
David M. Wolfe
Language
English
Document Type
Dissertation
Recommended Citation
Cassapakis, Constantine George. "Neutron Spectra At Zero Degrees From Proton Bombardment Of Light Nuclei At Medium Energies." (1975). https://digitalrepository.unm.edu/phyc_etds/333
