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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03791naa a2200409 4500 | |
| 001 | oai:research.chalmers.se:a1e4f671-094f-4ff5-933f-b5971aa92f9c | |
| 003 | SwePub | |
| 008 | 171007s2015 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://research.chalmers.se/publication/2153692 URI |
| 024 | 7 | a https://doi.org/10.1016/j.nima.2015.01.1042 DOI |
| 040 | a (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Chernikova, Dina,d 1982u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)dinac |
| 245 | 1 0 | a The neutron-gamma Feynman variance to mean approach: Gamma detection and total neutron-gamma detection (theory and practice) |
| 264 | 1 | b Elsevier BV,c 2015 |
| 520 | a Two versions of the neutron gamma variance to mean (Feynman-alpha method or Feynman-Y function) formula for either gamma detection only or total neutron gamma detection, respectively, are derived and compared in this paper. The new formulas have particular importance for detectors of either gamma photons or deleclors sensitive to both neutron and gamma radialion. If applied to a plastic or liquid deleclor, he total neutron-gamma detection Feynman-Y expression corresponds Lo a situation where no discrimination is made between neutrons and gamma parlicles. The gamma variance Lo mean formulas are useful when a detector of only gamma radialion is used or when working with a combined neutron-gamma deleclor at high count rates. The theoretical derivation is based on the Chapman-Kolmogorov equation with the inclusion of general reactions and corresponding intensities for neutrons and gammas, but with the inclusion of prompt reactions only. A one energy group approximation is considered. The comparison of the two different theories is made by using reaction intensities obtained in MCNPX simulations with a simplified geometry for two scintillation detectors and a Cf-252-source. In addition, the variance to mean ratios, neutron, gamma and total neutron-gamma are evaluated experimentally for a weak Cf-252 neutron-gamma source, a Cs-137 random gamma source and a Na-22 correlated gamma source. Due to the focus being on the possibility of using neutron-gamma variance to mean theories for both reactor and safeguards applications, we limited the present study to the general analytical expressions for Feynman-alpha formulas. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Subatomär fysik0 (SwePub)103012 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Subatomic Physics0 (SwePub)103012 hsv//eng |
| 653 | a Total Feynman-Y | |
| 653 | a Feynman-Y | |
| 653 | a Feynman-alpha | |
| 653 | a Variance to mean | |
| 653 | a Fast detection | |
| 653 | a Gamma Feynman-Y | |
| 700 | 1 | a Axell, Kåre,d 1965u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)karea |
| 700 | 1 | a Avdic, S.u Univerzitet u Tuzli,University of Tuzla4 aut |
| 700 | 1 | a Pazsit, Imre,d 1948u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)imre |
| 700 | 1 | a Nordlund, Anders,d 1964u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)andnord |
| 700 | 1 | a Allard, Stefan,d 1968u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)stefane |
| 710 | 2 | a Chalmers tekniska högskolab Univerzitet u Tuzli4 org |
| 773 | 0 | t Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipmentd : Elsevier BVg 782, s. 47-55q 782<47-55x 0168-9002 |
| 856 | 4 | u http://arxiv.org/pdf/1411.4120 |
| 856 | 4 8 | u https://research.chalmers.se/publication/215369 |
| 856 | 4 8 | u https://doi.org/10.1016/j.nima.2015.01.104 |
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