M. Bassanb, c, B. Buonomoa, G. Cavallarie, 1, E. Cocciab, c, S. D’Antoniob, V. Fafoneb, c, L.G. Foggettaa, 2, C. Ligia, A. Marinia, G. Mazzitellia, G. Modestinoa, G. Pizzellac, a, L. Quintieria, F. Rongaa, P. Valented, S.M. Vinkoa, 3
a Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Via E. Fermi, 40, 00044 Frascati, Italy
b Istituto Nazionale di Fisica Nucleare, Sezione Roma2, Via della Ricerca Scientifica, 00133 Rome, Italy
c Dipartimento di Fisica, Università di Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy
d Istituto Nazionale di Fisica Nucleare, Sezione Roma1, piazzale Aldo Moro 2, 00185 Rome, Italy
e CERN, CH1211, Genève, Switzerland
Received 9 June 2011; revised 2 August 2011; Accepted 15 August 2011. Available online 22 August 2011.
Abstract
We report new measurements of the acoustic excitation of an Al5056 superconductive bar when hit by an electron beam, in a previously unexplored temperature range, down to 0.35 K. These data, analyzed together with previous results of a dedicated experiment obtained for T
, show a vibrational response enhanced by a factor ∼4.9 with respect to that measured in the normal state. This enhancement explains the anomalous large signals due to cosmic rays previously detected in the NAUTILUS gravitational wave detector. (download)
1 Honarary member of CERN.
2 Now at Laboratoire de l’Accèlerateur Linaire, CNRS-Orsay, 91898 Orsay cedex, France.
3 Now at Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
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