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Resonance Capture Reactions with a Total Energy Detector

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Neutron Capture Gamma-Ray Spectroscopy

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Abstract

Nuclear reaction rates can be determined in two basic types of experiment; depending respectively on counting and energy release. A simple example would be to measure the alpha disintegration rate of a sample. The number of alpha particles emitted in a given time could be counted with a charged particle counter or by measuring the helium released. Alternatively, the energy released could be measured with a calorimeter and divided by the (known) energy per alpha particle to arrive at the number of alpha disintegrations per unit time. This second approach has been exploited to measure (n,γ) cross sections of isotopic targets for which the neutron binding energy (BE) is generally well known, ranging from roughly 4 to 11 MeV. The total excitation energy of each compound nucleus formed is computed to good accuracy as:

$${E_X}\, = \,\,{E_n}\,\left( {A/\left( {A\, + \,1} \right)} \right)\, + \,BE$$

where En is the incident neutron energy and A is the atomic mass of the stationary target nucleus.

These include electronic deadtime corrections, three measured background effects, resonance selfprotection, Doppler broadening and elastic scattering in the sample (also inelastic scattering at higher energies), scattered neutron sensitivity of the detector and sample impurity corrections.

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Authors and Affiliations

  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37830, USA

    R. L. Macklin

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  1. R. L. Macklin
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Editors and Affiliations

  1. Brookhaven National Laboratory, Upton, New York, USA

    Robert E. Chrien  & Walter R. Kane  & 

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© 1979 Plenum Press, New York

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Macklin, R.L. (1979). Resonance Capture Reactions with a Total Energy Detector. In: Chrien, R.E., Kane, W.R. (eds) Neutron Capture Gamma-Ray Spectroscopy. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2940-4_26

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  • DOI: https://doi.org/10.1007/978-1-4613-2940-4_26

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4613-2942-8

  • Online ISBN: 978-1-4613-2940-4

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