FellowDr. Paresh Prajapati
Project NameMonoenergetic fast neutrons: Powerful tool for nuclear and material studies
Host organisationInstitute of Physics
Duration of the project21.04.2015 - 20.04.2018

Abstract
Current Project deals with intention and further development of new laboratory equipped with tuneable source of monoenergetic neutrons. Tandetron accelerator driven source will dominantly use 2D(d,n)3He nuclear reaction, with employment of deuterium gas cell. Accelerator will be operational in town of Piestany, is fully funded and delivery is expected in summer 2015. Neutron-induced reactions with production of gamma rays are of special interest, therefore dedicated gamma-ray spectrometer instrumented with both semiconductor and scintillation detectors will be constructed and commissioned. The research programme of the laboratory is dominated with studies of reactions related to present and future nuclear energy production and to homeland security applications, especially detection of explosives and fissile material. Fundamental studies of nuclear structure, namely very short lifetime measurements, are also foreseen.

Project Summary with Interim Results

Tandetron Accelerator with terminal voltage of 2 MV, designed by the High Voltage Engineering Europa B. V was delivered at Piestany in November 2015. It is under commissioning test. We expect the first charged particle beam from Tandetron in summer 2016. It is capable of deliver protons or deuterons beam with energy from 100 keV up to 4 MeV. It can also accelerate the alpha particle beam up to 6 MeV. Nuclear reaction 2D(d,n)3He will be mainly used for neutron production within the frame of current project at Piestany. The employment of gas cell appears to be most optimal, since it provides sufficient yield of neutrons. The state of art D2 gas target has been designed for neutron production after critically examining gas target facilities at ATOMKI, Debrecen [1] and PTB, Braunschweig [2]. The simulation of neutron production from gas target has been carried out by DROSG [3] code. The simulated results indicates that maximum 7 MeV neutrons can be produced with deuteron beam energy of 4 MeV with 1 µA current. The simulations predicts neutron fluence of the order of 106 n/sec. Neutron shielding and safety calculations have been performed by MCNP code [4]. The calculations shows that the neutron and photon dose calculations for 7 MeV neutrons with fluence of 1x106 n/sec outside the hall is under the limit of Radiological limits (i.e 1 mSv/y) given by International organizations such as IAEA, Eurotom and ICRP. Further, it is planned to measure 20Ne(α,γ)24Mg cross-section at stellar energies. It is end point helium burning reaction for the stellar Nucleosynthesis. SRIM-TRIM [5] calculations has been performed for the neon target preparation. 500 kV ion implanter facility at Slovak University of Technology at Tranava will be used for neon target preparation.

 

References:

  1. L.Olah et al, Nucl. Inst. Meth. Phys.Res. A 404, (1998) 373-380
  2. S. Cabral et al., Nucl.Sci.Eng. 106, (1990) 308-317
  3. M.Drosg, DROSG-2000, Codes and database for 59 neutron source reactions, documented in the IAEA report IAEA report IAEA-NDS-87 Rev. 9 (May 2005)
  4. X-5 Monte Carlo Team, "MCNP - Version 5, Vol. I: Overview and Theory", LA-UR-03-1987 (2003)
  5. SRIM – The Stopping and Range of Ions in Matter”, J. F. Ziegler, J. P. Biersack and M. D. Ziegler, Ion Implantation Press (2008)