NEUTRON EMISSION FROM SPONTANEOUS FISSION OF HEAVY ELEMENTS

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NEUTRON EMISSION FROM SPONTANEOUS FISSION OF HEAVY ELEMENTS 2011 Student Practice in JINR Fields of Research NEUTRON EMISSION FROM SPONTANEOUS FISSION OF HEAVY ELEMENTS Students: RIHA Thomas TARGA Alexandre Supervisor: Alexander I. SVIRIKHIN Flerov Laboratory of Nuclear Reactions, JINR Dubna, 2011

Main goal of project Preparation of the detection system of VASSILISSA separator for experiments aimed to investigation of neutron properties of spontaneous fissioning heavy nuclei

Vassilissa Separator SHELS Separator Spontaneous Fission detection Fusion

Description of detectors

Calibration

Calibration

Calibration

Calibration fission fragments fission fragments

Detector Efficiency tav= 41 [μs]

Detector Efficiency

Detector Efficiency

Detector Efficiency

Conclusion - Neutron detection efficiency ε = 45 % - Average living time of neutron before capturing in 3He-detector tav = 41 μs

References - J.R Dunning et al., Interations of neutrons with Matter Phys. Rev. 48, 265-280 (1935) - A.Foderaro, The Elements of Neutron Interaction theory MIT Press, Cambridge, USA (1971) - J. Martin, Physics for Radiation protection John Wiley and sons, New York, USA (2000) - D.C. Hoffman et al., Nucl. Phys., A502 (1989) 21-40 - E.A. Sokol et al., Phys. Instr. Meth., A400(1997) 96-100 - A.V. Yeremin et al., Phys. At. Nucl., 66(2003) 1042-1052 - A.V. Yeremin et al., Phys. Instr. Meth., A539(2005) 441-444 - A.I. Svirikhin et al., Eur. Phys. J. A 44, 393–396 (2010)

Acknowledgement We would like to express our gratitude to our supervisor Mr. Alexander I. SVIRIKHIN for his attention and for his helpful discussions and to the Vassilissa team as well.

Thank you for your attention!