Kurtosis of momentum and displacement distributions in biphenyl

Ulpiani, P. and Romanelli, G. and Onorati, D. and Krzystyniak, M. and Andreani, C. and Senesi, R. (2021) Kurtosis of momentum and displacement distributions in biphenyl. Il nuovo cimento C, 44 (4-5). pp. 1-4. ISSN 1826-9885

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Abstract

We apply the method of moment expansion, in terms of standard deviation and kurtosis, to the nuclear momentum and displacement distributions of hydrogen in biphenyl. In particular, we present first-principles calculations and we compare them to deep inelastic neutron scattering experiments, for the nuclear momentum distribution, and to X-ray diffraction, for the displacement distribution, so as to investigate the degree of anisotropy of the single-particle local potential. We find that, in the spirit of the central limit theorem, as a function of the increasing number of vibrations affecting a nucleus, the nuclear displacement distribution becomes more isotropic, as was the case of the nuclear momentum distribution, yet the trend is not monotonic with two local maxima at 125 meV and 20 meV.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	20 Sep 2021 09:52
Last Modified:	20 Sep 2021 09:52
URI:	http://eprints.bice.rm.cnr.it/id/eprint/21357

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