scholarly journals The Elementary Excitation Spectra of Liquid Helium II

1979 ◽  
Vol 61 (2) ◽  
pp. 367-383 ◽  
Author(s):  
K. Fukushima ◽  
N. Koyama ◽  
T. Sugiyama
Keyword(s):  
Liquid Helium ◽  
Elementary Excitation ◽  
Excitation Spectra ◽  
Helium Ii

Effects of the T-matrix center-of-mass approximation in the Brueckner–Sawada theory of liquid helium II

1985 ◽  
Vol 63 (12) ◽  
pp. 1548-1554
Author(s):  
S. K. Bose ◽  
D. F. Goble
Keyword(s):  
Liquid Helium ◽  
Center Of Mass ◽  
Interacting Particles ◽  
Excitation Spectra ◽  
Helium Ii ◽  
Mass Approximation ◽  
Interparticle Separation ◽  
T Matrix ◽  
The Difference ◽  
Bose Einstein

As a model for liquid helium II, we study the Bose–Einstein gas with a two-body interaction potential of the form ~δ(r − a), where r is the interparticle separation. Excitation spectra for various values of a are calculated using the Brueckner–Sawada approach based on the concept of the T matrix. However, unlike the work of Brueckner and Sawada and many other related works that followed, we take into account the dependence of the T matrix on the center-of-mass momentum of the interacting particles. Excitation spectra calculated with and without this dependence, using two different expressions for the two-particle propagator, indicate the validity of the Brueckner and Sawada center-of-mass approximation for physically interesting values of a. The difference between the two spectra is found to increase as a increases.

scholarly journals Multi-Branch Structure of the Excitation Spectra in Liquid Helium II

1973 ◽  
Vol 49 (6) ◽  
pp. 1802-1820 ◽  
Author(s):  
Takeji Kebukawa ◽  
Shuichiro Yamasaki ◽  
Sigenobu Sunakawa
Keyword(s):  
Liquid Helium ◽  
Excitation Spectra ◽  
Helium Ii

scholarly journals On the Mechano-Caloric Effect in Liquid Helium II

1950 ◽  
Vol 5 (6) ◽  
pp. 1010-1013 ◽  
Author(s):  
S. Nakajima ◽  
M. Shimizu
Keyword(s):  
Liquid Helium ◽  
Helium Ii ◽  
Caloric Effect

Heat Transfer in Liquid Helium II by Internal Convection

1948 ◽  
Vol 74 (9) ◽  
pp. 1148-1156 ◽  
Author(s):  
F. London ◽  
P. R. Zilsel
Keyword(s):  
Heat Transfer ◽  
Liquid Helium ◽  
Helium Ii ◽  
Internal Convection
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