By K. Ohbayashi, M. Watabe (auth.), Professor Kohji Ohbayashi, Professor Mitsuo Watabe (eds.)
This quantity is the lawsuits of the Hiroshima Symposium on basic Excitations in Quantum Fluids, which used to be hung on August 17 and 18, 1987, in Hiroshima, Japan, and used to be attended by way of thirty-two scientists from seven international locations. Quantum fluids were the topic of excessive learn because of their superfluid homes at very low temperatures. trouble-free excitations in them are an enormous proposal approximately which many very important discoveries were made in recent times. This symposium used to be prepared through a gaggle of physicists from Hiroshima collage to supply a chance to debate those fresh advancements. It used to be conceived as a satellite tv for pc convention of the 18th foreign convention on Low Temperature Physics (LT 18), which was once held in Kyoto, August 20-26, 1987. Emphasis was once put on the dynamic buildings and correlations of ele mentary excitations, which led to invited audio system being chosen from this box. even if, enthusiastic participants mentioned outstanding new effects on a variety of different points of the straight forward excitations, which made the sympo sium full of life and profitable. it's our nice pride to give this quantity, consisting of papers of excellent caliber and originality. We thank the entire parti cipants for his or her cooperation all through this symposium, and for getting ready their manuscripts inside of an affordable time.
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Additional resources for Elementary Excitations in Quantum Fluids: Proceedings of the Hiroshima Symposium, Hiroshima, Japan, August 17–18, 1987
10. e. Svensson, P. F. B. Woods, Can. Journ. Phys. 54, 2178 (1976). 11. E. Talbot and A. Griffin, Phys. Rev. 829, 2531 (1984). 12. B. e. Svensson, Phys. Rev. Letters 41, 974 (1978). 13. F. P. M. Doyle, N. Masukara, D. J. Greytak, Phys. Rev. Letters, 59, 672 (1987). 14. D. P. Wolfe and A. Mysyrowlcz, Phys. Rev. Letters 59, 827 (1987). 15. e. Gay and A. Griffin, J. Low Temp. Phys. 58, 479 (1985). Ohbayashi Faculty of Integrated Arts and Sciences, Hiroshima University, Hiroshima 730, Japan 1. Introduction In our recent measurements of Raman scattering from superfluid 'He [16), we have found several new results which in one part verify theoretical predictions left untested and in another part demand re-investigation of seemingly well established concept of two-roton bound state.
9 K. The curves are hand drawing through the data points. 2A. indicates twice the energy of a single roton determined by neutron scattering. lent enough to determine both the roton energy and the binding energy multaneously without recourse to the data of neutron scattering. si- As shown in Fig. 4, we observed that the shift of the two-roton peak from 2A. changes from negative to positive as pressure increases. It is interesting to test whether all these spectra are consistently fitted by the HZ theory.
The scattering formula of Eq . (2) is well established. However, to calculate the Raman spectrum is not easy. One reason is that the polarizability tensor o(r,r') is not well known. The Minnesota group investgated it theoretically and predicted existence of s34 wave scattering quantitatively. Another reason is that an exact relation between the density fluctuation and the elementary excitation is not known. RUVALDS and ZAWADOWSKI assumed a linear relation and derived the concept of two-roton bound state.