First nuclear activation experiments using the new accelerator NUCLOTRON in Dubna

0185911 - UJF-V 20033229 RIV DE eng J - Journal Article
Adam, Jindřich - Barabanov, M. Y. - Bradnova, V. - Brandt, R. - Charoun, P. - Hella, KM. - Hashemi-Nezhad, R. S. - Kalinnikov, V. G. - Krasnov, VA. - Krivopustov, M. I. - Kulakov, BA. - Odoj, R. - Pronskikh, V. S. - Robotham, H. - Solnyshkin, A. A. - Sosnin, A. N. - Stegailov, V. I. - Tsoupko-Sitnikov, V. M. - Westmeier, W.
First nuclear activation experiments using the new accelerator NUCLOTRON in Dubna.
Kerntechnik. Roč. 68, 5/6 (2003), s. 214-218. ISSN 0932-3902. E-ISSN 2195-8580
R&D Projects: GA AV ČR KSK2067107
Keywords : energy proton-beams * spallation neutrons
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 0.130, year: 2003

First nuclear activation experiments have been carried out using the new accelerator for relativistic particles NUCLO-TRON in Dubna. The distribution of neutrons emitted during the irradiation with 0.65, 1.0 and 1.5 GeV protons from a lead target (circle divide = 8 cm, 1 = 20 cm) and moderated by surrounding paraffin of 6 cm thickness was studied with radiochemical sensors along the beam axis on top of the moderator Small La-139-sensors of approximately 1 g each were used to measure essentially the thermal neutron fluence at different depths near the surface: i.e. on top of the moderator, in 10 mm deep holes and in 20 mm deep holes, respectively. The reaction La-139 (n, gamma) La-140 (tau(1/2) = 40.27 h) was studied using standard procedures of gamma-ray spectrometry and data analysis. The induced activity of La-140 increases strongly with the depth of the hole inside the moderator Its activity distribution along the beam direction on top of the moderator has its maximum about 10 cm downstream the entrance of the protons into the lead and the activity increases about linearily with the proton energy. Some comparisons of the experimental results with model estimations based on the LAHET code are also presented. The experiments were carried out in the Veksler and Baldin Laboratory of High Energies of the Joint Institute for Nuclear Research in Dubna, Russian Federation.
Permanent Link: http://hdl.handle.net/11104/0082262