hrvatski jezikClear Cookie - decide language by browser settings

Loss of the associated α-particles in the tagged neutron generators

Sudac, Davorin; Nađ, Karlo; Obhođaš, Jasmina; Bystritsky, V; Valković, Vladivoj (2015) Loss of the associated α-particles in the tagged neutron generators. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 793 . pp. 18-23. ISSN 0168-9002

PDF - Published Version - article
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (1MB) | Preview


The reported loss of α-particles in the 14 MeV tagged neutron generators has been investigated using two neutron generators equipped with α-particle counters and two neutron detectors. One neutron detector was put right in the middle of the tagged neutron cone and another one was put outside the cone. By measuring the difference between double (neutron–neutron) and triple (α-neutron-neutron) coincidences it is possible to deduce the α-particle loss since the number of triple coincidences should be equal to the number of double coincidences. In all measurements performed a deficit of triple with respect to double coincidences has been observed. This deficit was smallest for the threshold of α-particle Constant Fraction Discriminator (αCFD) being 0 and maximum allowed voltage of α-particle detector being −1.7 kV. The smallest measured deficit value was equal to 13±1%. From the observed results it was concluded that the deficit was due to a number of non-detected α-particles that loose sufficient quantity of energy while traveling to the detector because of collisions with particles present in the neutron tube and/or in the tritium target. These α-particles will not be detected as they fall under the threshold of αCFD discriminator. Magnetic fields present in the system worsen the situation since they are forcing α-particles to travel larger distances because of toroidal movement and undergoing additional collisions. Tagged neutron technique has many kind of applications and it is particularly important for high accuracy nuclear cross-sections measurements when α-particles losses must be carefully assessed.

Item Type: Article
Uncontrolled Keywords: Alpha particles, Neutron generators, Fast neutrons, Associated alpha particle method, Neutron flux
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Razvoj i primjene nuklearnih analitičkih metoda-Jasmina Obhođaš098-0362975-2881MZOS
Depositing User: Kristina Ciglar
Date Deposited: 28 Oct 2016 15:44
DOI: 10.1016/j.nima.2015.04.059

Actions (login required)

View Item View Item


Downloads per month over past year

Increase Font
Decrease Font
Dyslexic Font