@article{oai:uec.repo.nii.ac.jp:00009362,
 author = {Taniguchi, Junko and Ichida, Hideyuki and Suzuki, Masaru},
 issue = {2},
 journal = {Physical Review B},
 month = {Jan},
 note = {We performed ultrasound measurements for 4He films adsorbed on a mesoporous silica. We observed a large decrease in sound velocity with increasing temperature, accompanied by an attenuation peak. The observed dependence of the sound velocity on temperature is well explained by a thermally activated relaxation process. The magnitude of the change in sound velocity is comparable to that due to the total mass loading of 4He, suggesting that the mass decoupling occurs at low temperature.},
 title = {Ultrasound study of the mass decoupling of 4He inert films on mesoporous silica},
 volume = {99},
 year = {2019}
}