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 Results for DC.creator="V." AND DC.creator="F." AND DC.creator="Sears" in section 4.4.4 of volume C
Compilation of scattering lengths and cross sections
Sears, V. F.  International Tables for Crystallography (2006). Vol. C, Section 4.4.4.6, pp. 453-454 [ doi:10.1107/97809553602060000594 ]
... in Table 4.4.4.1. As in earlier versions of this table (Sears, 1984, 1986b, 1992a,b), our primary aim, has been to ... values listed in Table 4.4.4.1 are the same as in Sears (1992b). References Koester, L., Rauch, H. & Seymann, E. (1991 ... At. Data Nucl. Data Tables, 49, 65-120. Mughabghab, S. F. (1984). Neutron cross sections, Vol. 1, Part B: ...

Measurement of scattering lengths
Sears, V. F.  International Tables for Crystallography (2006). Vol. C, Section 4.4.4.5, p. 453 [ doi:10.1107/97809553602060000594 ]
... be measured (Koester, 1977; Klein & Werner, 1983; Werner & Klein, 1986; Sears, 1989; Koester, Rauch & Seymann, 1991). The measurements employ a ... unit volume. Apart from a small (<=0.01%) local-field correction (Sears, 1985, 1989), this expression is exact. In methods based on ... and methods. At. Data Nucl. Data Tables, 49, 65-120. Sears, V. F. (1985). Local-field refinement of neutron ...

Correction for electromagnetic interactions
Sears, V. F.  International Tables for Crystallography (2006). Vol. C, Section 4.4.4.4, p. 453 [ doi:10.1107/97809553602060000594 ]
... an atom includes additional contributions from electromagnetic interactions (Bacon, 1975; Sears, 1986a, 1996). For a neutral atom with atomic number ... the wavevector transfer in the collision, and are constants, and f(q) is the atomic scattering factor (Section 6.1.1 ). The ... of the electron number density and is normalized such that f(0) = Z. The main contribution to is from the ...

Scattering lengths for neutrons
Sears, V. F.  International Tables for Crystallography (2006). Vol. C, Section 4.4.4, pp. 444-454 [ doi:10.1107/97809553602060000594 ]
... shielding, extinction, thermal diffuse scattering, and detector efficiency (Bacon, 1975; Sears, 1989). Table 4.4.4.1 lists the best values of the ... information can be found in, for example, the book by Sears (1989). Table 4.4.4.1| | pdf interactive version Bound scattering lengths ... 5.84(7) 0 4.29(10) 0 4.29(10) 0.00016(1) F 9 19 1/2(+) 100 5.654(10) -0.082(9) ...

Scattering and absorption cross sections
Sears, V. F.  International Tables for Crystallography (2006). Vol. C, Section 4.4.4.2, p. 452 [ doi:10.1107/97809553602060000594 ]
... to k. Since k is proportional to the neutron velocity v, the absorption is said to obey a 1/v law. By convention, absorption cross sections are tabulated for a velocity v = 2200ms-1, which corresponds to a wavevector k = 3.494- ...

Scattering lengths
Sears, V. F.  International Tables for Crystallography (2006). Vol. C, Section 4.4.4.1, p. 444 [ doi:10.1107/97809553602060000594 ]
Scattering lengths 4.4.4.1. Scattering lengths The scattering of a neutron by a single bound nucleus is described within the Born approximation by the Fermi pseudopotential, in which r is the position of the neutron relative to the nucleus, m the neutron's mass, and b the bound scattering length. The neutron ...

Isotope effects
Sears, V. F.  International Tables for Crystallography (2006). Vol. C, Section 4.4.4.3, pp. 452-453 [ doi:10.1107/97809553602060000594 ]
Isotope effects 4.4.4.3. Isotope effects The coefficients and in (4.4.4.2) for the bound scattering length depend on the particular isotope under consideration, and this provides an additional source of incoherence in the scattering of neutrons by a mixture of isotopes. If is now taken to denote an average over both the ...

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