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# Experimental determination of Q0 factors and effective resonance energies with a multi-channel approach: the α-vector method

Fulvio Farina (UGent) and Karel Strijckmans (UGent)
(2014) 302(1). p.631-646
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Abstract
Some of the Q 0 and Ē r factors from the 2003 to 2012 recommended k 0-datasets were adopted from older literature (Lit; before 1984), at the time of the launch of the k 0-method and have associated uncertainties of 10 %. The Ē r factors on the other hand, were derived analytically in 1979 and 1987 by employing the Breit–Wigner resonance representation, but in 1984 a multi-channel method was proposed for simultaneous Q 0 and Ē r experimental determination. In this work we assumed the α-dependence of the Ē r parameter proposed later in 1987 for a generalization of this method, which was then employed in the experimental determination of Q 0 and Ē r factors for 17 (n,γ) target isotopes on up to three channels of the BR1 reactor at the SCK-CEN (Mol, Belgium). Retrospectively, this “α-vector method” can be employed for α-calibration and it provides a practical way of averaging the experimental Q 0 (and Ē r) results from several laboratories. Our Q 0 results have 2–3 % uncertainty and are compared with the Lit elsewhere.
Keywords
Neutron Activation Analysis, Q0 factor, s0 factor, Effective resonance energy Ēr, Modified Westcott formalism, k0 method, NEUTRON-ACTIVATION ANALYSIS, NUCLEAR-DATA COMPILATION, CROSS-SECTION RATIOS, KO-MEASUREMENTS, PEAK EFFICIENCY, NAA, ENDF/B-VII.1, DEPENDENCE, DETECTORS, K(0)

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## Citation

Chicago
Farina, Fulvio, Peter Vermaercke, Katrien Smits, Liesel Sneyers, and Karel Strijckmans. 2014. “Experimental Determination of Q0 Factors and Effective Resonance Energies with a Multi-channel Approach: The Α-vector Method.” Journal of Radioanalytical and Nuclear Chemistry 302 (1): 631–646.
APA
Farina, Fulvio, Vermaercke, P., Smits, K., Sneyers, L., & Strijckmans, K. (2014). Experimental determination of Q0 factors and effective resonance energies with a multi-channel approach: the α-vector method. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 302(1), 631–646.
Vancouver
1.
Farina F, Vermaercke P, Smits K, Sneyers L, Strijckmans K. Experimental determination of Q0 factors and effective resonance energies with a multi-channel approach: the α-vector method. JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY. 2014;302(1):631–46.
MLA
Farina, Fulvio, Peter Vermaercke, Katrien Smits, et al. “Experimental Determination of Q0 Factors and Effective Resonance Energies with a Multi-channel Approach: The Α-vector Method.” JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 302.1 (2014): 631–646. Print.
@article{4422140,
abstract     = {Some of the Q 0 and \={E} r factors from the 2003 to 2012 recommended k 0-datasets were adopted from older literature (Lit; before 1984), at the time of the launch of the k 0-method and have associated uncertainties of 10 \%. The \={E} r factors on the other hand, were derived analytically in 1979 and 1987 by employing the Breit--Wigner resonance representation, but in 1984 a multi-channel method was proposed for simultaneous Q 0 and \={E} r experimental determination. In this work we assumed the \ensuremath{\alpha}-dependence of the \={E} r parameter proposed later in 1987 for a generalization of this method, which was then employed in the experimental determination of Q 0 and \={E} r factors for 17 (n,\ensuremath{\gamma}) target isotopes on up to three channels of the BR1 reactor at the SCK-CEN (Mol, Belgium). Retrospectively, this {\textquotedblleft}\ensuremath{\alpha}-vector method{\textquotedblright} can be employed for \ensuremath{\alpha}-calibration and it provides a practical way of averaging the experimental Q 0 (and \={E} r) results from several laboratories. Our Q 0 results have 2--3 \% uncertainty and are compared with the Lit elsewhere.},
author       = {Farina, Fulvio and Vermaercke, Peter and Smits, Katrien and Sneyers, Liesel and Strijckmans, Karel},
issn         = {0236-5731},
journal      = {JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY},
language     = {eng},
number       = {1},
pages        = {631--646},
title        = {Experimental determination of Q0 factors and effective resonance energies with a multi-channel approach: the \ensuremath{\alpha}-vector method},
url          = {http://dx.doi.org/10.1007/s10967-014-3276-x},
volume       = {302},
year         = {2014},
}


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