1. 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

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

3.  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.

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

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

6. 6 Big Scintillator detector

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

9. 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

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

15.  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.

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