Novel Approaches to Neutron Measurement

About this video

This colloquium was hosted on behalf of the IOP Nuclear Physics Group by Sheffield Hallam University and the University of Brighton.

Tanya Hutton, University of Cape Town
Next-generation detector technologies for fast neutron metrology up to 200 MeV

Fast neutron fields are frequently found in medical facilities, nuclear power plants, accelerators, aviation, and in space environments. In fast neutron metrology detector systems based on organic liquid scintillators, photomultiplier tubes and analogue pulse processing electronics are used to obtain spectral information, often by time-of-flight. While considered the industry standard, these systems are ageing towards obsolescence and cannot easily be deployed in the field.

At the n-lab, University of Cape Town, a new neutron detector based on modern technologies has been developed for use in mixed radiation fields with a focus on measuring neutron energies between 1 - 200 MeV. The prototype detector consists of an EJ-276 plastic scintillator, capable of pulse shape discrimination, coupled to a silicon photomultiplier and digital data acquisition. The method of spectrum unfolding is used to deconvolve neutron energy from the measured light output after gamma ray events have been excluded.

The next generation design of this detector system aims to enable fast neutron metrology in a range of external scenarios, including evidence-led regulation of occupational exposure of air crew, and measurements of biologically relevant quantities with respect to fast neutron irradiation up to 200 MeV.

Jose Javier Valiente Dobon, Legnaro National Laboratory - INFN
The neutron detector array NEDA

Future studies of exotic nuclei with radioactive as well as high-intensity stable heavy ions will require a high selectivity for reaction channel identification. In the case of heavy-ion fusion-evaporation and transfer reactions, where the outgoing particle is a neutron, a neutron detector with a large efficiency and neutron/gamma-ray discrimination capabilities is mandatory.

The new NEutron Detector Array (NEDA) [1,2] is a collaborative European effort to construct a modern neutron detector array for experiments with stable and radioactive ion beams. The collaboration is based on the long-standing experience grown with the realization and use of the Neutron Wall [3], a highly efficient medium granularity neutron detector array used in combination with the EUROBALL spectrometer and later with EXOGAM. NEDA has been designed to be versatile and optimized for the operation with stable beams and second-generation radioactive ion-beam facilities (SPES, SPIRAL2, FAIR, etc.) and it will be used in combination with gamma-ray arrays such as AGATA, GALILEO, EXOGAM2 and PARIS. A large effort was devoted by the collaboration for the validation of Monte Carlo simulations,
study of new detector materials, pulse-shape discrimination algorithms and the development of digital electronics fully compatible with the state-of-the-art gamma-spectrometers such as AGATA. NEDA 1p performed its first physics campaign coupled to AGATA at GANIL in 2018.

In this presentation I will discuss the status of NEDA as well as some physics results obtained in the campaign of NEDA+AGATA at GANIL [4] and the future plans of the collaboration.

[1] J.J. Valiente-Dobón et al., Nucl. Instr. Meth., A927 (2019) 81 (and references therein).
[2] T. Hüyük et al., Eur. Phys. J. A. 52, (2016) 1.
[3] Ö. Skeppstedt et al., Nucl. Instr. Meth., A421 (1999) 531.
[4] B. Cederwall et al., Phys. Rev. Lett. 124 (2020) 062501.

Mr Ocean Wong, Sheffield Hallam University
Neutron spectrum unfolding with foil activation: algorithm and system design

Comments

Please login to leave comments.

Information

  • Added:21 Oct 2021
  • Uploaded by:James Smallcombe
  • Length:02:21:31
  • Views:34
  • Comments:0
  • Viewer rating:

Rate this video

Embed this video

Copy and paste the code below into the source of another web page.