Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

Full text (ua)

F. A. Danevich¹, S. S. Nagorny¹, S. S. Yurchenko<sup>1,2

1</sup>Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
²Kyiv Taras Shevchenko National University, Kyiv, Ukraine

Abstract: Pulse shape analysis technique for discrimination of low-energy scintillation signals from the photomultiplier noises was developed. Samples of low-energy signals, free from photomultiplier noise admixture were measured in special calibration runs. The algorithm of preliminary signal processing to determine beginning and base line of the pulses was developed. Comparison of different pulse shape discrimination methods was done. Among them are the methods of "average time", optimal digital filter, least squares and artificial neural networks. The 100% discrimination efficiency for CdWO₄ scintillation signals with energies of ≥ 15 keV from photomultiplier noises was achieved.

1. Danevich F. A., Tretyak V. I., Georgadze A. Sh., Kobychev V. V. et al. New results of ¹¹⁶Cd double β decay study with ¹¹⁶CdWO₄ scintillators. Phys. Rev. C 62 (2000) 045501. https://doi.org/10.1103/PhysRevC.62.045501

2. Danevich F. A., Tretyak V. I., Georgadze A. Sh., Kobychev V. V. et al. α activity of natural tungsten isotopes. Phys. Rev. C 67 (2003) 014310. https://doi.org/10.1103/PhysRevC.67.014310

3. Danevich F. A., Georgadze A. Sh., Kobychev V. V. et al. Search for 2β decay of cadmium and tungsten isotopes: Final results of the Solotvina experiment. Phys. Rev. C 68 (2003) 035501. https://doi.org/10.1103/PhysRevC.68.035501

4. Bernabei R., Belli P., Landoni V. et al. New limits on WIMP search with large-mass low-radioactivity NaI(Tl) set-up at Gran Sasso. Phys. Lett. B 389 (1996) 757. https://doi.org/10.1016/S0370-2693(96)01483-9

5. Wu S. C., Yue Q., Lai V. P. et al. Near threshold pulse shape discrimination techniques in scintillating CsI(Tl) crystals. Nucl. Instr. Meth. Phys. Res. A 523 (2004) 116. https://doi.org/10.1016/j.nima.2003.12.024

6. Gatti E., Geraci A., Riboldi S. et al. Digital Penalized LMS method for filter synthesis with arbitrary constraints and noise. Nucl. Instr. Meth. Phys. Res. A 523 (2004) 167. https://doi.org/10.1016/j.nima.2003.12.032

7. Robinson M., Lightfoot P. K., Carson M. J. et al. Reduction of Coincident Photomultiplier Noise Relevant to Astroparticle Physics Experiments. Nucl. Instr. Meth. Phys. Res. A 545 (2005) 225. https://doi.org/10.1016/j.nima.2005.01.319

8. Fazzini T., Tretyak V. I., Bizetti P. G., Maurenzig P. R. et al. Pulse-shape discrimination with CdWO₄ crystal scintillators. Nucl. Instr. Meth. Phys. Res. A 410 (1998) 213. https://doi.org/10.1016/S0168-9002(98)00179-X

9. E. Gatti, F. De Martini. A new linear method of discrimination between elementary particles in scintillation counters. In: Nuclear Electronics. Vol. II. Proc. of the Conf. on Nuclear Electronics, Belgrade, 15 - 20 May 1961 (Vienna, IAEA, 1962) p. 265. https://inis.iaea.org/collection/NCLCollectionStore/_Public/43/116/43116625.pdf

10. Уоссермен Ф. Нейрокомпьютерная техника (Москва: Мир, 1992).