Measurement of Fragment Mass Dependent Kinetic Energy and Neutron Multiplicity for Thermal Neutron Induced Fission of Plutonium-239.

• NISHIO Katsuhisa

  Department of Nuclear Engineering, Kyoto University

• NAKAGOME Yoshihiro

  Research Reactor Institute, Kyoto University

• KANNO Ikuo

  Department of Nuclear Engineering, Kyoto University

• KIMURA Itsuro

  Department of Nuclear Engineering, Kyoto University

Abstract

Kinetic energy and neutron multiplicity as a function of fragment mass were measured for the thermal neutron induced fission of ²³⁹Pu. By measuring the velocities and energies of two fission fragments simultaneously, both of the pre-neutron emission fragment mass m^* and the post-neutron mass m were obtained. The fragment mass dependent neutron multiplicity ν(m^*)was deduced by subtracting m from m^*. The fragment mass dependent total kinetic energy TKE(m^*) was also obtained from this data. The fragment velocity was measured by time-of-flight (TOF) method, for which the start signal was triggered by a very thin plastic scintillation film detector (TFD) and the stop signal was obtained by a silicon surface barrier detector (SSBD) which was also used for the measurement of the fragment kinetic energy.<BR>The present result of ν(m^*) is in good agreement with that of Apalin et al. and that in the light fragment region of Fraser et al. The obtained TKE(m^*) agrees well with the data of Wagemans et al. A calculation was carried out with the model proposed by Brosa et al. who assumed multichannel fission paths and a random neck rupture. It is seen that the calculated results of both fragment mass dependent kinetic energy and neutron multiplicity represent experimental data well.

Journal

• Journal of Nuclear Science and Technology

  Journal of Nuclear Science and Technology 32 (5), 404-414, 1995

  Atomic Energy Society of Japan

Keywords

• plutonium 239
• thermal neutron fission
• fission fragments
• total kinetic energy
• excitation energy
• neutron multiplicity
• time-of-flight method
• silicon surface barrier detector
• thin film detector
• multichannel fission
• random neck rupture
• experimental data
• comparative evaluations

Details

• CRID: 1390001204094296064
• NII Article ID: 10002072501
• NII Book ID: AA00703720
• DOI: 10.3327/jnst.32.404
• COI: 1:CAS:528:DyaK2MXms1aitb0%3D
• ISSN: 18811248
• ISSN: 00223131
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed