NEUTRON EMISSION FROM SPONTANEOUS FISSION OF HEAVY ELEMENTS

NEUTRON EMISSION FROM SPONTANEOUS FISSION

OF HEAVY ELEMENTSStudents:RIHA ThomasTARGA Alexandre

Supervisor:Alexander I. SVIRIKHIN

Flerov Laboratory of Nuclear Reactions, JINR Dubna, 2011

2011 Student Practice in JINR Fields of Research

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

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 efficiencyε = 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!