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dc.contributor.advisor Phillips, Gerald C.
dc.creatorBonner, Billy
dc.date.accessioned 2016-04-22T21:58:29Z
dc.date.available 2016-04-22T21:58:29Z
dc.date.issued 1963
dc.identifier.citation Bonner, Billy. "Measurement of (p,n) thresholds at tandem energies." (1963) Master’s Thesis, Rice University. https://hdl.handle.net/1911/89777.
dc.identifier.urihttps://hdl.handle.net/1911/89777
dc.description.abstract The "counter ratio" technique of Bonner, et al., for measuring neutron thresholds has been extended to bombarding energies greater than 6 MeV. Neutron background problems had previously precluded neutron threshold measurements with this technique at these energies. A system was developed which allowed the beam to be stopped 30 ft. away from the thin foil target in a heavily shielded cave. No slits were used other than those of the analyzing magnet, and they were shielded. A remotely retractable plunger permitted accurate alignment of the beam by minimizing the beam current on a Ta disk with a 3/16" aperture. The slow counter consisted of 2 BF3 tubes imbedded in paraffin through which the beam passed. Improvement in background by a factor of 5 or better over stopping the beam in a Ni58 slug at the target was achieved. Thresholds were measured for various (p,n) reactions, and the results are given as follows according to the form, reaction (level in'residual nucleus) threshold energy in MeV: C13(p,n)N13(0) 3.235, (2) 6.965; Al27(p,n)Si27(0) 5.800, (1) 6.611, (2) 6.793, (3) 8.046, (4) 8.549; Cr52(p„n)Mn52(1) 5.975, (2) 6.149; Ni58(p,n)Cu58(0) 9.509; Ni60(p,n)Cu60(0) 7.025, (1) 7.092, (2) 7.325; Ni62(p,n)Cu62(0) 4.812, (1) 4.852, (2) 5.109. Many resonances were seen in the various compound nuclei.
dc.format.extent 48 pp
dc.language.iso eng
dc.title Measurement of (p,n) thresholds at tandem energies
dc.identifier.digital RICE0809
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Physics
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Arts
dc.format.digitalOrigin reformatted digital
dc.identifier.callno Thesis Phys. 1963 Bonner


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