By J. Ruvalds (Eds.)
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Q = 77 and Ε p - 2q 2 2 q 2q-q 2q y < q 2 and 2 < y < q 2 + 2 q are the Fermi energy and wavevector The scattering from a non-interacting Fermi system is then a distribution in frequency as shown in fig. 5, the w i d t h of the distribution being a direct result of the Fermi statistics. In a weakly interacting Fermi system the susceptibility is believed (9) to be given to a reasonable approximation by the random phase approximation. If the Fourier transform of the interaction between the particles is V ( Q ) then this approximation gives the susceptibility a s ; X(Q,u)) = x°(Q,U))/(l - V ( Q ) x ° ( Q , u O ) .
Rev 0 d 30 (1973) . 3 . Rev . g 53 Rev . (1974) 7 footnot , , . . Phys Lett 210 B13 (1976) Hohenber , A8 . , Rev Phys , B9 , Pobell . 6 , Wortis Rev . (1977) Rev Wortis M . Phys Aharony , 298 instance . J . M . d Phys Rev . , Rev r d d an Phys Hohenberg . an an r , . u Ferer Fere Ferer Aharony , Iha LeGuillo . , Ahlers . (1974) Stauffer (1972) (1972) A . C 5 . (1974) A9 , . 127 8 (1974) . Mod . Regge, eds. A. Department FROM QUANTUM Cowley of P h y s i c s , University of E d i n b u r g h , Mayfield R o a d , E d i n b u r g h , I.
S(Q,co) and for a n o n - i n t e r a c t i n g for an interacting E ω Fermi F gas, solid gas calculated within line, the 3 phase approximation. energy E ? 78 A _ 1 . the Fermi random Neutron IV scattering Experimental Results A. General He a non-interacting section Bose excitation and it w a s liquid that the n e u t r o n H it was that this system. This scattering K. to found in m e a s u r e m e n t s The from to consist of a well feature m i g h t be expected is indeed at temperatures b e l o w 1,5 4 are n o t , h o w e v e r , in agreement w i t h 4 and shown 41 liquids at Τ = 0 Κ is expected suggested also for an interacting fig.