Abstract： The speed of first sound in liquid helium II is calculated quantum mechanically. The calculation is made by using a modified version of Brueckner and Sawada’s method [Phys. Rev. 106 (1959) 1128] and is based on the postulate that the hard core length is directly proportional to the negative of the pressure.
PAO Lu;Joseph P.Foy. Calculation of First Sound Speed in Liquid Helium[J]. 中国物理快报, 1999, 16(4): 276-278.
PAO Lu, Joseph P.Foy. Calculation of First Sound Speed in Liquid Helium. Chin. Phys. Lett., 1999, 16(4): 276-278.
1999, Vol. 16 
