Measurement of cross-sections of yttrium (n,xn) threshold reactions by means of gamma spectroscopy

0486426 - ÚJF 2018 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Chudoba, Petr - Kilim, S. - Wagner, Vladimír - Vrzalová, Jitka - Svoboda, Ondřej - Majerle, Mitja - Štefánik, Milan - Suchopár, Martin - Kugler, Andrej - Bielewicz, M. - Strugalska-Gola, E. - Szuta, M. - Hervas, D. - Herman, T. - Geier, B.
Measurement of cross-sections of yttrium (n,xn) threshold reactions by means of gamma spectroscopy.
Physics Procedia. Vol. 59. Amsterdam: Elsevier Science BV, 2014, s. 114-118. ISSN 1875-3892.
[2nd Scientific Workshop on the Emission of Prompt Gamma-Rays in Fission and Related Topics. Belgrade (RS), 24.09.2013-26.09.2013]
Institucionální podpora: RVO:61389005
Klíčová slova: cross-section * yttrium * background subtraction
Obor OECD: Nuclear physics

Neutron activation and gamma spectrometry are usable also for the determination of cross-sections of different neutron reactions. We have studied the cross-section of yttrium ( n,xn) threshold reactions using quasi mono-energetic neutron source based on the reaction on Li-7 target at Nuclear Physics Institute of ASCR in Rez. Yttrium ( n, xn) threshold reactions are suitable candidates for fast neutron field measurement by activation detectors. Fast neutron field monitoring is necessary already today at a wide range of accelerator facilities and will gain on importance in future fast reactors of generation IV, accelerator transmutation systems or fusion reactors. The knowledge of the cross-sections is crucial for such purpose. Unfortunately, the cross-section is sufficiently known only for Y-89( n,2n)Y-88 reaction. For higher orders of reactions there are almost no experimental data. Special attention was paid to the Y-89(n,3n)Y-87 reaction. The nuclei are produced, both in the ground state with half-life 79.8 hours and in the isomeric state with half-life 13.38 hours. The isomer decays mainly through the gamma transition to the ground state, the beta decay of the excited state is negligible within our accuracy. The cross-sections of both Y-87 productions were analyzed.
Trvalý link: http://hdl.handle.net/11104/0281240