1. 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

2. 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

3. Vassilissa Separator SHELS Separator Spontaneous Fission detection
Fusion

4. Description of detectors

5. Calibration

6. Calibration

7. Calibration

8. Calibration
fission fragments
fission fragments

9. Detector Efficiency
tav= 41 [μs]

10. Detector Efficiency

11. Detector Efficiency

12. Detector Efficiency

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

14. References - J.R Dunning et al., Interations of neutrons with Matter
Phys. Rev. 48, (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)
- A.V. Yeremin et al., Phys. At. Nucl., 66(2003)
- A.V. Yeremin et al., Phys. Instr. Meth., A539(2005)
- A.I. Svirikhin et al., Eur. Phys. J. A 44, 393–396 (2010)

15. 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.

16. Thank you for your attention!