| 摘 要： | Ultrasonic attenuation in liquid hydrogen has been messured withthe pulse-echo technique as a function of temperature from 13.84K to 20.50K,at 45MHz.The results indicate that the temperature dependence ofultrasonic attenuation in liquid hydrogen is mainly determined by volumeviscosity effect.Ultrasonic attenuatin due to volume viscosity is gettingmore and more with cooling.The ratio between volume viscous coefficientand shear viscous coefficient is from 1.4 to 4.2 within the measured tempera-ture region.
|
