Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Nukleare Astrophysik

HK 54.6: Talk

Friday, March 21, 2014, 12:30–12:45, HZ 4

Prompt fission γ-ray emission from thermal- and fast-neutron induced fission — •Stephan Oberstedt¹, Robert Billnert^1,2, Matthieu Lebois³, Andreas Oberstedt², and Jon Wilson³ — ¹European Commission, Joint Research Centre IRMM — ²Fundamental Fysik, CTH, S-41296 Göteborg — ³Institut de Physique Nucléaire Orsay, F- 91406 Orsay

In recent years we conducted a systematic investigation of fission-fragment de-excitation through prompt neutron and γ-ray emission. For the latter we were able to obtain spectral data for thermal-neutron induced fission on ²³⁵U [1] and ²⁴¹Pu [2] with unprecedented accuracy. The recently installed neutron source LICORNE [3], where neutrons are produced in inverse kinematics, enables us to explore prompt de-excitation also for fast-neutron induced fission. A first experiment campaign on ^235,238U and ²³²Th was performed at LICORNE. From our experimental data we established a systematic trend up to incident neutron energies of 20 MeV that compares well with modern theoretical calculations.

[1] A. Oberstedt et al., Phys. Rev C87, 051602(R), 2013

[2] R. Billnert et al., to be published in Phys. Rev C

[3] M. Lebois et al., Nucl. Instr. Meth. A735 (2014) 145-151