EXCITATION OF ROTONS IN HELIUM II BY COLD NEUTRONS

Journal Article · Wed Oct 01 04:00:00 EDT 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.112.11· OSTI ID:4294733

Palevsky, H; Otnes, K; Larsson, K E

The nature of collective excitations in helium II has been investigated by means of the interaction of these excitations with cold neutrons. The experiment demonstrates the existence of excitations with long mean free path compared to their wavelength, confirming the theoretical ideas of Landau and Feyzman. The dispersion relation for the excitations in the energy region of the "roton minimum" is directly measured and gives the following Landau parameters: DELTA =8.1 plus or minus 0.4 K, Po/h=1.9 plus or minus 0.03 A/sup -1/ and mu = O.16 plus or minus O.O2m/sub He/ (auth)

• Research Organization: A.B. Atomenergi, Stockholm
• NSA Number: NSA-13-002345
• OSTI ID: 4294733
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 112; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CRYOGENICS
DISPERSION RELATIONS
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
EXCITATION
FIELD THEORY
HELIUM
INTERACTIONS
LOW TEMPERATURE
MEASURED VALUES
NEUTRONS
PHYSICS AND MATHEMATICS
PROTONS
SUPERFLUIDITY
VISCOSITY