Neutron reaction data

The status of available neutron reaction data is published regularly in the CINDA (Computer Index of Neutron Data) series. CINDA (see, e.g., CINDA 2003) contains bibliographical references to measurements, calculations, reviews, and evaluations of neutron cross sections and other microscopic nuclear data. It also includes index references to computer libraries of... 

JEFF-3.1 - Joint-Evaluated Fission and Fusion Library The complete suite of data was released in May 2005, and contains general purpose nuclear-data evaluations compiled at the NEA Data Bank in co-operation with several laboratories in NEA Data Bank member countries (JEFF-3.2 is at beta test stage). JEFF-3.1 also contains radioactive decay data, activation data and fission yield data. The library contains neutron reaction data, incident proton data and thermal neutron scattering raw data in the ENDF-6 format. 

The data of Table I are derived from early time radiochemical data reported by Stevenson (5). The linearity of the radionuclide ratios was first pointed out in that report. The aerial filter samples were taken at successively later times, 1 and 2, below the reported cloud base, and 3, 4, and 5 in the cloud. The tabulated values of rA correspond to atom ratio of isotope A to an arbitrary refractory isotope normalized by dividing by the atom ratio in which the two species were formed. Refractory species include the isotopes of the rare earths Eu and Tb as well as 45Ca, 89Zr, Sc, and others produced by neutron reactions on stable isotopes. The tabulation has been limited to fission product species. However, the... 

FIGURE 14.26. Absolute structure of deuterated lithium glycolate and its biochemical implications (Ref. 114). (a) Some neutron dispersion data are listed for lithium-6 S-glycolate-2-d. Values are given for 100(/4. — I-)/ I+ + I-) — 100 difference/sum = 100 D/S (see Equations 14.2 and 14.3). Calc. = calculated value from the absolute structure found, and Obs. = measured value from the Bragg reflections, (b) The structure of the glycolate ion, together with its chemical formula, and (c) the steric course of the enzymatic reaction deduced from this X-ray diffraction study. 

In conclusion, out of the eight iron (III) centers participating in the reaction (10.7), seven are in four-fold coordination and one, in a three-fold coordination. In other words, the expected average coordination number for molten iron (III) chloride should be lower than four and this is in agreement with the finding of neutron diffraction data obtained by Price et al. (1998), which gives an average coordination number of 3.8. 

Neutron diffraction data on a pure sample of Sr2 01(, N found the interlayer gap void of hydrogen [148]. Further its reaction with D, leads smoothly to a mixture of SrND and SrD2 [149, 150] and not to Sr2NDx as suggested previously. Since SrN , SrNH. and SrOxNv arc all black materials with the rocksalt structure (a = 5.495, 5.46, and 5.473 A, respectively), it is likely that SrN is actually the imide or an oxynitride solid solution. We believe that the expected composition Sr3N2 has yet to be observed as a pure phase. 

Cm, Cm, etc., and by radionuclides formed by neutron reactions with fuel structural material, such as metal cladding. Methods and illustrative data that can be used in estimating the concentrations of such radionuclides and their contributions to decay heat are discussed in Chaps. 3 and 8. 

A thermally populated triplet excited state of the triclinic form of (KS03)2N02 has been detected by e.p.r. and static susceptibility measurements. The crystal structure of HK2NO6S2 has been redetermined from three-dimensional neutron-diffraction data. The reaction of SO2 with molybdate ions in aqueous solution... 

Jijil et al. [49] investigated BaCej. PLOa-d type of catalysts. They found that the activity increases when the catalyst is recycled indicating an enhancement in Pt surface distribution during reaction. Their neutron diffraction data shows that the oxygen vacancies increase with increase in Pt substitution and the oxygen vacancies created are in the O2 site. 

Neutron-transfer data dcj/dO, and S dp from the (d,p)-reactions [69Mo24, 64Hj02] in the first columns are compared with data from other reactions Cf S from the (p,d) and (d,t) reactions [77Bi02], 5dt and ratio S dt/S dp from [70Di06]. 

The nuclear reaction Co (n,y) Co is the most frequently used monitoring reaction for thermal neutrons over longer exposure periods. The only stable cobalt isotope Co reacts with thermal neutrons to Co as well as directly to Co since ° "Co decays almost completely (99.74%) to Co with a halflife of 10.2 min it can be ignored in the determination of neutron fluence data. Thus, in practice, °Co can be regarded as the only reaction product. Both y transitions of Co at 1.17 and 1.33 MeV show transition probabilities of 100% each. 

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