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Study of Possible Scintillation Mechanism Damage in PbWO4 Crystals After Pion Irradiation

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arxiv physics/0410133 v2 pith:EJO22MKY submitted 2004-10-19 physics.ins-det hep-ex

Study of Possible Scintillation Mechanism Damage in PbWO4 Crystals After Pion Irradiation

V.A.Batarin , J.Butler , T.Y.Chen , A.M.Davidenko , A.A.Derevschikov , Y.M.Goncharenko , V.N.Grishin , V.A.Kachanov
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A.S.Konstantinov V.I.Kravtsov V.A.Kormilitsin Y.Kubota V.S.Lukanin Y.A.Matulenko Y.M.Melnick A.P.Meschanin N.E.Mikhalin N.G.Minaev V.V.Mochalov D.A.Morozov L.V.Nogach A.V.Ryazantsev P.A.Semenov V.K.Semenov K.E.Shestermanov L.F.Soloviev S.Stone A.V.Uzunian A.N.Vasiliev A.E.Yakutin J.Yarba
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classification physics.ins-det hep-ex
keywords scintillationdamagemechanismcrystalseffectirradiationlightbeam
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We employed two independent methods to study possible damage to the scintillation mechanism in lead tungstate crystals due to irradiation by a 34 GeV pion beam. First, 10 crystals were irradiated simultaneously over 30 hours by a narrow beam, so that only a small region of each crystal was affected. We studied the effect of the irradiation on the light output non-uniformity. If a localized degradation was observed, it would indicate damage to the scintillation mechanism. Secondly, we detected light output using two phototubes attached to sides of a crystal. Since these phototubes detect scintillation light only from a small localized region, the effect of transmission loss should be minimal. We did not see any statistically significant evidence for scintillation mechanism damage with either method. The effect is consistent with zero, and the upper limit is 0.5% at 95% C.L.

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