Table 5 The experimental values of the kinetic energy of protons, carbon, and nitrogen nuclei for the powder sample of melamine of mass M = 2.298 g compared with ab initio predictions from the HLD simulations.

From: Non-invasive detection of hazardous materials with a thermal-to-epithermal neutron station: a feasibility study towards practical application

Nucleus

HLD prediction

Multivariate Gaussian fit

Isotropic Gaussian fit

 

\( E_k (x) \)

\(E_k (y)\)

\(E_k (z)\)

\(E_k (x)\)

\(E_k (y)\)

\(E_k (z)\)

\(E_k\)

H

32.8

75.4

52.1

29.9 ± 3.1

77.2 ± 5.1

45.8 ± 11.7

–

C

25.1

35.6

34.6

–

–

–

44.2 ± 17.3

N

19.1

28.8

27.6

–

–

–

72.2 ± 13.6

  1. In the case of protons, both experimental values and ab initio predictions are obtained from the multivariate Gaussian model of the nuclear momentum distribution using Eq. 19. The experimental values for carbon and nitrogen atoms are obtained from the isotropic Gaussian model and ab initio predictions from the multivariate Gaussian model. All values of kinetic energy are given in units of meV.
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