Measurement of Gamma Energy Distributions and Multiplicities Using STEFF

E {Murray}, Gavin Smith, A G {Smith}, A J {Pollitt}, J {Matarranz}, I {Tsekhanovich}, T {Soldner}, U {Koster}, D C {Biswas}

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Prompt gamma-ray energy distributions and multiplicities released during thermally induced fission of 235U have been measured using STEFF (SpecTrometer for Exotic Fission Fragments). Thermal neutrons are provided by the high-flux reactor at the ILL, Grenoble. STEFF is a unique 2E2v device that uses a coincidence timing method to measure the emission of prompt gamma rays as a function of the fragment mass and energy. Following scission, the fission fragments contain excitation energy that is released via prompt neutron and gamma-ray emission as the fragment decays to the ground state. STEFF contains an array of 11 NaI detectors surrounding the uranium target providing a 6.8% photopeak detection efficiency for gamma rays released within 1 ns of the scission time. STEFF also consists of 7 NE213 detectors, which detect the emission of prompt neutrons, the release of which is associated with reduction of fragment energy and, to a lesser extent, fragment spin. This experiment acts as a direct response to the NEA high priority demand which requires more accurate knowledge of heating caused by gamma emission in the next generation of nuclear reactors.
    Original languageEnglish
    JournalNuclear Data Sheets
    Volume119
    DOIs
    Publication statusPublished - 2014

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