Absence of a quadratic term in the He4 excitation spectrum

Pat R. Roach; B. M. Abraham; J. B. Ketterson; M. Kuchnir

doi:10.1103/PhysRevLett.29.32

Absence of a quadratic term in the He4 excitation spectrum

Pat R. Roach^*, B. M. Abraham, J. B. Ketterson, M. Kuchnir

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

By directly measuring the difference in velocity of 30 and 90 MHz sound waves in liquid He4 below 100 mK, we have determined that the elementary excitation spectrum cannot be described by an expression ε(k)=ck(1+α1k+α2k2+) which has a value for α1 that is greater than 0.01 .

Original language	English (US)
Pages (from-to)	32-34
Number of pages	3
Journal	Physical review letters
Volume	29
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.29.32
State	Published - 1972

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.29.32

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@article{b90255e7f25c432aa1f66212e932df96,

title = "Absence of a quadratic term in the He4 excitation spectrum",

abstract = "By directly measuring the difference in velocity of 30 and 90 MHz sound waves in liquid He4 below 100 mK, we have determined that the elementary excitation spectrum cannot be described by an expression ε(k)=ck(1+α1k+α2k2+) which has a value for α1 that is greater than 0.01 .",

author = "Roach, {Pat R.} and Abraham, {B. M.} and Ketterson, {J. B.} and M. Kuchnir",

year = "1972",

doi = "10.1103/PhysRevLett.29.32",

language = "English (US)",

volume = "29",

pages = "32--34",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "1",

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T1 - Absence of a quadratic term in the He4 excitation spectrum

AU - Roach, Pat R.

AU - Abraham, B. M.

AU - Ketterson, J. B.

AU - Kuchnir, M.

PY - 1972

Y1 - 1972

N2 - By directly measuring the difference in velocity of 30 and 90 MHz sound waves in liquid He4 below 100 mK, we have determined that the elementary excitation spectrum cannot be described by an expression ε(k)=ck(1+α1k+α2k2+) which has a value for α1 that is greater than 0.01 .

AB - By directly measuring the difference in velocity of 30 and 90 MHz sound waves in liquid He4 below 100 mK, we have determined that the elementary excitation spectrum cannot be described by an expression ε(k)=ck(1+α1k+α2k2+) which has a value for α1 that is greater than 0.01 .

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U2 - 10.1103/PhysRevLett.29.32

DO - 10.1103/PhysRevLett.29.32

M3 - Article

AN - SCOPUS:24444459533

SN - 0031-9007

VL - 29

SP - 32

EP - 34

JO - Physical review letters

JF - Physical review letters

IS - 1

ER -

Absence of a quadratic term in the He4 excitation spectrum

Abstract

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