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1、VibrationalexcitationinducedbyelectronbeamandcosmicraysinnormalandsuperconductivealuminumbarsM.Bassanb,c,B.Buonomoa,G.Cavallarie,E.Cocciab,c,S.D'Antoniob,V.Fafoneb,c,L.G.Foggettaa,1,C.Ligia,,A.Marinia,G.Mazzitellia,G.Modestinoa,G.Pizzellac,a,L.Quintieria,F.Rongaa,P.Valented,S
2、.M.Vinkoa,2aIstitutoNazionalediFisicaNucleare-LaboratoriNazionalidiFrascati,ViaE.Fermi,40-00044Frascati,ItalybIstitutoNazionalediFisicaNucleare-SezioneRoma2,ViadellaRicercaScienti ca-00133Rome,ItalycDipartimentodiFisica,UniversitadiTorVergata,ViadellaRicercaScienti ca-00133Ro
3、me,ItalydIstitutoNazionalediFisicaNucleare-SezioneRoma1,piazzaleAldoMoro2-00185Rome,ItalyeCERN,CH1211,Geneve,SwitzerlandAbstractWereportnewmeasurementsoftheacousticexcitationofanAl5056su-perconductivebarwhenhitbyanelectronbeam,inapreviouslyunexploredtemperaturerange,downto0.3
4、5K.Thesedata,analyzedtogetherwithprevi-ousresultsoftheRAPexperimentobtainedforT>0.54K,showavibrationalresponseenhancedbyafactor4:9withrespecttothatmeasuredinthenor-malstate.ThisenhancementexplainstheanomalouslargesignalsduetocosmicrayspreviouslydetectedintheNAUTILUSgravitatio
5、nalwavedetector.Keywords:Gravitationalwavedetectors,Cosmicrays,RadiationacousticsPACS:04.80.Nn,41.75.Ht,96.50.S-,61.82.Bg,74.70.AdarXiv:1105.4724v2[gr-qc]2Aug20111.IntroductionCosmicrayshowerscanexcitesuddenmechanicalvibrationsinametalliccylinderatitsresonancefrequencies;inexp
6、erimentssearchingforgravitationalwaves(gw)thesedisturbancesarehardlydistinguishablefromthesearchedsignalandrepresentanundesiredsourceofaccidentalevents,thusincreasingCorrespondingauthor1nowatLaboratoiredel'AccelerateurLinaire,CNRS-Orsay,91898Orsaycedex,France2nowatDepartment
7、ofPhysics,ClarendonLaboratory,UniversityofOxford,ParksRoad,Oxford,OX13PU,UK1thebackground.Thise ectwassuggestedmanyyearsagoanda rstsearchwascarriedoutwithlimitedsensitivitywithroomtemperatureWebertyperesonantbardetectorsandendedwithanullresult[1].Lateron,thecryogenicresonantgw
8、detectorNAUTILUS[2]wasequippedwithastreamertubeextensiveairsh
