By S.I. Sukhoruchkin, Z.N. Soroko, F. Gunsing, V.G. Pronyaev (auth.), H. Schopper (eds.)
Parameters of neutron resonances are discovering expanding curiosity, not just for clinical difficulties just like the figuring out of astrophysical approaches yet much more so for purposes. For the development and the security of traditional nuclear reactors such information are crucial and for brand new advancements just like the thorium-uranium cycle or for nuclear waste transmutation they're indispensible. because the final booklet of neutron resonance parameters at Landolt-Börnstein in 2004, the standard and precision of the information has been significantly more suitable, in part by means of the operation of latest neutron spectrometers, e.g., the CERN time-of-flight facility lately placed into operation and likewise via new rigorously designed neutron catch detectors. quantity I/24 includes neutron resonance parameters for the nuclear degrees of 356 nuclei with Z starting from 1 to ninety eight compiled by means of eminent specialists within the box. back a substantial attempt used to be made in evaluating information from various resources which will remedy a few prior discrepancies and determine 'best values', one of many major features of Landoldt- Börnstein guides. with the intention to examine the knowledge from varied resources a comparability of a few of the experimental installations has been given. In view of the massive volume of information the parameters for less than an important resonances are given within the published model. besides the fact that, the knowledge for all resonances can be found on-line at www.springerlink.com (DOI: 10.1007/978-3-540-87866-7). Neutron resonance parameters of many nuclei have been formerly released by means of Landolt-Börnstein in Volumes I/16B and I/16C.
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Extra resources for Neutron Resonance Parameters
1007/978-3-540-87866-7_1 ©Springer 2009 17 18 1 Introduction neutron beam C6 D6 PM sample ⊡ Fig. 6 Modelled setup of a neutron capture experiment with two C6 D6 scintillator detectors to determine the detector response function to gamma-rays in order to derive the pulse height weighting function. The weighting function is often taken as a polynome of which the parameters are obtained from a ﬁt of the response functions of several mono-energetic gamma-rays. The response functions can be obtained by Monte Carlo simulation codes like MCNPX [06Mo0A] or GEANT [06Al0A].
The nucleus is treated as a black box of which the properties of the eigenstates have to be measured in order to describe the cross sections. The binary nuclear reactions proceeding from one system of two particles to another system of two particles can be described with the general R-matrix theory. For neutron induced reactions, but also in other cases, such a reaction goes often through the formation of a compound nucleus X∗ , A + a → X ∗ → B + b. (13) The R-matrix formalism does not only apply to compound nucleus reactions.
DANCE is located on a 20-m beam line. It is a highly segmented array of 160 BaF2 crystals arranged as an approximately 4π-calorimeter for measurements of neutron capture cross sections, γ -ray multiplicities and capture-to-ﬁssion ratios [08Ha0A, 06Ul0A, 01He0A]. The efﬁciency of DANCE is approximately 95% for detection of a single γ -ray of 1 MeV. The high efﬁciency of DANCE allows measurements with milligram or even sub-milligram samples. The 6 LiH spherical shell is placed between the sample and the scintillator to absorb scattered neutrons.