1,2 Tshepo Dinoko, 3 Vasilij Andrianov, 3 Pavel Sedyshev 1 iThemba LABS, Somerset West 7129, South Africa 2 University of the Western Cape, Bellville 7535,

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1,2 Tshepo Dinoko, 3 Vasilij Andrianov, 3 Pavel Sedyshev 1 iThemba LABS, Somerset West 7129, South Africa 2 University of the Western Cape, Bellville 7535, Cape Town, South Africa 3 Frank Laboratory of Neutron Physics, JINR, Дубна

 Introduction  Aim  Breit-Wigner formula  Experimental setup  Analysis  Conclusion  Acknowledgements

 Neutron spectroscopy is part of neutron physics studying energy dependence of effective cross sections of different neutrons- nuclei interactions and formed nuclei excited state characteristics.

 To determine the ratio of Zinc and Copper in Brass samples.  Through (neutron, gamma) reaction.

 The experiment was carried out at the IREN (Intence REsonance Neutron source)facility. -It is 30MeV linear accelerator, with beam power of 400W.

6 Big Scintillator detector

 Electron energy – 30MeV  Pulse current – 3A  Repetition rate – 50Hz  Neutron intensity – ~10 12 n/s

Placed 50m away from the reactor. Adv: : better resolution of neutrons : Higher neutron energies can be reached.  Length – 60cm  Diameter – 73cm  Inner diameter – 30cm  Volume of each scintillator – 35L  12 Photomultipliers

 Large volume liquid scintillator detector consisting of 6 sections 1- Photomultiplier 2- Investigated sample 3- Scintillator section

 The statistics affected the results.  The uncertainty was too high.  In general there is more Copper than Zinc in Brass, but for this analysed data it is the other way around.

 Prof. Leslie Lekala and Dr Noel Jacobs (South African supervisors)  Vasiliy Andrionov and Dr Pavel Sedyshev (JINR-FLNP supervisors)