Browsing by Author "Bonner, T. W."
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Item A helium proportional counter for low energy neutron detection(1955) Slattery, Jack; Bonner, T. W.Item A NaI(T1) detector for the study of radiative capture processes(1953) Marion, Jerry Bascervil; Bonner, T. W.Item A neutron detector and lithium cross section measurements(1954) McCrary, James Harvey; Bonner, T. W.Item Unknown A study of scintillation properties of some organic crystals(1952) Taylor, Herbert Lyndon; Bonner, T. W.Item Unknown A study of the gamma-radiation from the reactions A1_ß + _ and Th___ + p(1958) Harlow, Marvin Vernon; Bonner, T. W.It is of considerable interest to the experimental nuclear spectroscopist to know accurately the description of energy levels in nuclei. Also of considerable interest is the nature of the radiations or particles emitted when an excited nucleus decays from an excited state to its ground state. This interest in the level structure of nuclei arises from the fact that level structure and modes of radioactive decay both serve as experimental verification for the theories describing nuclear matter. At the present time the experimental determination of the levels and decay schemes of all nuclei is far from complete. With the hope of adding to the existing knowledge of the levels and decay schemes of nuclei, a study of the low energy gamma-radiation emitted frost the low-lying states of Si30, P30 and Th232 made. The results of this investigation are reported and discussed in this thesis.Item Unknown A study of the O__(He_,n)Ne__ reaction near threshold(1961) Bearse, Robert C; Bonner, T. W.Item Unknown A test of magnetic lens pair spectrometer equipped with scintillation counters using the nuclear pairs from the reaction F__(p,[alpha])*O__(1952) Bent, Robert Demo; Bonner, T. W.Item Unknown Cross section for the reaction T_(d,n)He_(1951) Smith, James Richard; Bonner, T. W.Item Unknown Disintegration of oxygen by fast neutrons(1960) Worley, Doak Matthews; Bonner, T. W.Item Unknown Excitation curve for the reaction N__(d,n[pi])O__(1957) Rabson, Thomas Avelyn; Bonner, T. W.A magnetic leas pair spectrometer was used to study the nuclear pairs emitted by 016 when left in the excited state toy the reaction N15(d,n pi)O16. The deuteron beam for this reaction was obtained from the Rice Institute 6 mev Van de Graaff accelerator. The 6.05 Mev nuclear pair line from 016 was investigated. The spectrometer magnet current was then adjusted to the peak of this curve, and an excitation curve was run for deuteron energies from 2.2 Mev to 4.7 Mev. The 6.05 lev state of O16 which is the first excited state, is a 0+ state as is the ground state. Since gamma ray transitions are forbidden the nucleus decays to the ground state toy emitting nuclear pairs.Item Unknown Extension of the energy range of an intermediate image magnetic lens pair spectrometer(1956) Ranken, William A; Bonner, T. W.Item Unknown Fast neutrons around a 24 mev betatron(1957) Ewing, Ronald Ira; Bonner, T. W.Item Unknown Gamma radiations from excited states of N__(1960) Givens, Wyatt Wendell; Bonner, T. W.Item Unknown Inelastic neutron scattering from silicon(1957) Tabony, Robert Henry; Bonner, T. W.In order to have a better understanding of the atomic nucleus, a variety of nuclear reactions should be studied. One particular type of nuclear reaction is the inelastic neutron scattering from an element, that is, the observation of neutrons scattered from an element which have less energy leaving than when entering the scattering element, the rest of the energy having caused nuclei to be in some excited state. If the excited states in a nucleus are not too near each other, then one can observe the inelastic neutron cross section over a given incident neutron energy range indirectly by observing the gamma rays produced at energies corresponding to these states; this is both easier and much more accurate than the direct observation of the inelastically scattered neutrons. Silicon is a very satisfactory element for this type of investigation, since the lowest energy level in Si28 is 1.78 Mev, while the next level is about 4.54 Mev. Natural silicon is 92.2% Si28, 4.7% Si29, and 3.1% Si30. Hence the effect of the Si and Si is small. In this experiment, the relative inelastic neutron cross section was observed over an incident neutron energy range of 1.6 to 4.5 MeV by counting the gamma rays from the lowest Si28 level. At certain higher energies, the twenty channels were set so as to observe any peaks produced by gamma rays from levels above 1.78 Mev.Item Unknown Investigation of the C__(p,n)N__ reaction(1960) Hanna, Jeff; Bonner, T. W.The neutron yield from the C14(p,n)N14 reaction was first investigated by Shoup, Jennings, and Sun1°2 in 1948. A number of studios of this reaction have subsequently been conducted at bombarding energies up to 3.4 Mov.3-9 In this work, an energy-sensitive neutron counter was used to detect the neutrons from the reaction at 00 for proton energies from 2.8 to 5.3 Mev. Thresholds for the emission of neutrons from the compound nucleus N15 to the first and second excited states of N14 were measured at proton energies of 3.142 Nov and 4.894 Mev, respectively. The excitation curve for neutrons of all energies at 0° was run from 2.8 Rev to 4.89 Mev. In addtion, the excitation curves for the ground state and the first excited state groups of neutrons were resolved over the same region. The resonances occuring in the reaction were used to study the energy levels of the compound nucleus N15 in the region from 12.8 to 15.2 Mev. Resonances were observed which correspond to previously unreported N15 levels in N15 at 13.52 Nov and 14.49 Mev.Item Unknown Low energy neutrons for the reaction Be_(_,n)C__(1960) St. Romain, Franklin A; Bonner, T. W.Item Unknown Measurement of the energies of neutrons from the reaction Al__ß(d,n)Si__(1955) Chapman, Richard Alexander; Bonner, T. W.Item Unknown Neutron inelastic scattering in carbon(1955) Hall, Hugh Edward; Bonner, T. W.Item Unknown Radiative neutron capture in I___ß(1956) Davis, Edward A; Bonner, T. W.The prompt gamma rays and induced activity from the reaction I127(n,r)I128 are studied for neutron energy of 0.2 Mev to 1.91 Mev using a NaI(Tl) crstal both as target and detector. The relative cross sections calculated from both the prompt gamma ray and the induced activity data show good agreement. the cross section follows the law for netron energies less than a bout 0.5 Mev and becomes greater then the theoretical value at higher neutron energies, indicating that neutrons with [?] may become important. the agreement with the data of Martin and Tasschek is fair. The corrected pulse height spectrs from the prompt gamma rays of energies 1.1 to 7.1 Mev show no structure.Item Unknown Range-energy relations for protons in nickel(1957) Farmer, Bobby Joe; Bonner, T. W.The primary objective of this study was to determine by experimental methods a range-energy relation for protons in nickel, the energy range covered being between approximately 2 and 5 Mev. Nickel is often used for target backings and in other phases of nuclear research in which accurate values of particle energy absorption are required. Since no experimental data for ranges or energy loss in this metal were available in this energy range, it is apparent that such information would be very useful. The first determinations of ranges were carried out with monoenergetic alpha-particles produced by the disintegration of radioactive nuclei, this being the only source of high energy charged particles available at the time. Later, similar measurements were made with monoenergetic proton beams from particle accelerators. The method of determining the range of these particles in a particular substance was to introduce very thin layers of the material between the source and a detector until the transmission reached zero. Then a plot of the transmission as a function of the absorber thickness was obtained, from which the mean range, i.e., the range at which 50% transmission occurred, was determined. Due to the inaccuracy in determining the thicknesses of the thin foils, a high degree of accuracy could not be obtained with this method. With the advent of charged particle accelerators which utilized analyzing magnets, a source of a variety of charged particles became available. Since the energy of the particle beam is variable, we are given a new and more easily utilized method of mean range measurements. One may now use a single foil of the absorbing material, and instead of using the absorber thickness as the variable, use the energy of the particle beam. A transmission curve is then obtained which gives the transmission as a function of the energy. This method is more accurate in that the thickness of only one thick foil must be determined instead of many thin foils as was necessary in the earlier method. If a sufficient number of data points are obtained, one may find an empirical relation between the ranges and energies of the particles. Then upon differentiation of this relation, the rate of energy loss of the particle may be determined. This energy loss may then be compared with existing theories, a treatment of which is given in the next section.