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- W1681021225 abstract "Investigations were undertaken to obtain information about the formation and decay of nuclei occurring as the products in neutron-capture reactions. Samples of natural bromine, copper, iridium, nickel, and tungsten, and separated isotope, samples of Br/sup 79/, Br/sup 81/, Ni/sup 58/, Ni/sup 60/ , Ni/sup 62/, W/sup 182/, W/sup 184/, and W/sup 186/, were placed in a neutron beam and their neutron-capture gamma-ray spectra obtained. The energies and intensities of about 100 gamma-ray lines were determined from the spectra. If it is assumed that the maximum observed gamma ray energy for each isotope corresponds to a transition from the capture state to the ground state, then the energy of the transition is equal to the neutron binding energy in the product nucleus. In this way the neutron binding energies were determined. The general shape of the bromine and iridium spcctra was in qualitative agreement with that predicted from a statistical model of the nucleus. Intense high-energy lines were observed from the copper, nickel, and tungsten samples, indicating that a direct capture mechanism contributed to the neutroncapture cross section. Also, there was a correlation between the intensities of the high energy lines from copper and nickel and those of the proton groupsmore » leading to the same final state in the corresponding (d,p) reaction. The principal contributions to the background were: gamma rays independent of the sample, reactor gamma rays scattered by the sample, and capture gamma rays arising from neutrons scattered by the sample. Experiments were carried out to determine the magnitude and shape of each of the contributions, from which a background spectrum appropriate to each sample was constructed. In supplementary experiments the inherent electronic instability of the detection system was investigated and minimized; the ratio of the neutron flux to gamma-ray flux was measured and optimized: and the efficiency and resolution of the three-crystal spectrometer were determined.« less" @default.
- W1681021225 created "2016-06-24" @default.
- W1681021225 creator A5022439731 @default.
- W1681021225 date "1962-08-01" @default.
- W1681021225 modified "2023-09-24" @default.
- W1681021225 title "NEUTRON-CAPTURE GAMMA RAYS OF BROMINE, COPPER, IRIDIUM, NICKEL, AND TUNGSTEN" @default.
- W1681021225 hasPublicationYear "1962" @default.
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