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Your search keyword '"Diakaki, M."' showing total 3 results
Start Over Author "Diakaki, M." Topic particle accelerators
3 results on '"Diakaki, M."'

1. Cross Section Measurements of (n,x) Reactions at 17.9 and 18.9 MeV Using Highly Enriched Ge Isotopes.

Author

Chasapoglou, S., Vlastou, R., Kokkoris, M., Diakaki, M., Michalopoulou, V., Gkatis, G., Stamatopoulos, A., Axiotis, M., Harissopoulos, S., Lagoyannis, A., Savva, M.I., Stamatelatos, I.E., Vasilopoulou, T., and Lederer-Woods, C.

Subjects
NUCLEAR cross sections, NUCLEAR reactions, GERMANIUM isotopes, NEUTRON beams, PARTICLE accelerators
Abstract

Nine neutron induced reactions on Ge isotopes (70Ge(n,2n)69Ge, 76Ge(n,2n)75Ge, 73Ge(n,p)73Ga, 72Ge(n,p)72Ga, 73Ge(n,d/np)72Ga, 74Ge(n,d/np)73Ga, 74Ge(n,α)71mZn, 72Ge(n,α)69mZn, 73Ge(n,nα)69mZn) have been measured in this work at energies 16.4-18.9 MeV. For these reactions, most of the experimental datasets in literature were obtained with a natGe target. However, the residual nucleus produced by some reaction channels can also be produced from neighboring isotopes, acting as a contamination for the measured reactions. This contribution must be subtracted, based on theoretical calculations, bearing their own uncertainties. The use of enriched targets however, does not suffer from such contaminations, leading to accurate experimental results. In this scope, five highly isotopically enriched Ge samples have been used in this work. The quasi-monoenergetic neutron beams were produced via the 3H(d,n)4He reaction at the 5.5 MV Tandem Van de Graaff accelerator of N.C.S.R. 'Demokritos'. The cross section of these nine reactions were measured using the activation method, with respect to the 27Al(n,α)24Na reference reaction. [ABSTRACT FROM AUTHOR]

Published
2023
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2. Experimental and theoretical study of the (n,2n) reaction on 174,176Hf isotopes.

Author

Serris, M., Diakaki, M., Galanopoulos, S., Kokkoris, M., Lamprou, M., Papadopoulos, C. T., Vlastou, R., Demetriou, P., Kalfas, C. A., and Lagoyannis, A.

Subjects
*NUCLEAR reactions, *HAFNIUM isotopes, *NUCLEAR cross sections, *PARTICLE accelerators, *NUCLEAR energy, *STATISTICAL physics
Abstract

Cross sections for the 174Hf(n, 2n)173 Hf and 176Hf(n, 2n)175Hf reactions have been measured on the 5.5-MV Van de Graaff tandem accelerator of National Centre for Scientific Research "Demokritos" in Athens, in the neutron energy region from 8.8 to 11.0 MeV, using the activation technique. An experimental method to account for the contamination of the 176Hf(n, 2n) reaction by the 176Hf(n, λ) reaction activated by the parasitic neutrons of the beam is presented. Statistical model calculations have also been performed using the nuclear-reaction codes EMPIRE-II and TALYS. The results and effects of the nuclear input parameters as well as pre-equilibrium emission are discussed in detail. [ABSTRACT FROM AUTHOR]

Published
2012
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3. Characterization of the neutron flux distribution at the Athens Tandem Accelerator NCSR “Demokritos”

Author

Vlastou, R., Kokkoris, M., Diakaki, M., Constantinou, Ch., Kalfas, C.A., Kotrotsou, A., Lagoyannis, A., Lambrou, M., Loizou, V., Mara, E., Paneta, V., Provatas, G., and Tsinganis, A.

Subjects
*NEUTRON flux, *PARTICLE accelerators, *NEUTRON beams, *ENERGY security, *LIQUID scintillators, *MONTE Carlo method
Abstract

Abstract: Quasi-monoenergetic neutron beams, in the energy range 7–11.5MeV, produced via the 2H(d,n) reaction, have been used at the 5.5MV tandem T11/25 Accelerator Laboratory of NCSR “Demokritos”. The flux variation of the neutron beam is monitored with a BF3 detector, while the absolute flux is obtained with respect to reference reactions. An investigation of the energy dependence of the neutron fluence has been carried out using two independent techniques: by a liquid scintillator BC501A detector and deconvolution of its recoil energy spectra performed by means of the DIFBAS code, as well as via the multiple foil activation technique in combination with the SULSA unfolding code. The neutron facility has also been characterized by means of Monte Carlo simulations with MCNP5. [Copyright &y& Elsevier]

Published
2011
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