Momentum distribution and excitation spectrum of liquid helium

Autor:	W. Brenig, W. E. Parry
Rok vydání:	1963
Předmět:	Physics Nuclear and High Energy Physics Scattering Liquid helium Binding energy chemistry.chemical_element Neutron scattering law.invention Momentum Helium-4 chemistry Atomic theory law Atomic physics Helium
Zdroj:	Zeitschrift f�r Physik. 175:40-53
ISSN:	1434-601X 1434-6001
DOI:	10.1007/bf01375394
Popis:	The consistency of recent experimental and theoretical analyses of liquid He4 is investigated. Further evidence is found for a strong depletion of the zero momentum state. The modifications of a Brueckner-Sawada type approximation implied by this depletion as well as by the existence of a net attraction of the helium atoms are discussed. It is found that a single particle model which does not allow for a sufficient width in the single particle spectral function is incapable of giving the observed excitation spectrum as well as the binding energy of liquid He. Better results are obtained with a single particle model which usesFeynman's energiesk2/2ms(k) instead of the peak energy in neutron scattering.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4aeb67178d34d450b94eb998a700fc61 https://doi.org/10.1007/bf01375394 Zobrazit plný text záznamu