Title of article :
The FLASH thick-target experiment
Author/Authors :
Abbasi، نويسنده , , R. and Abu-Zayyad، نويسنده , , T. and Belov، نويسنده , , K. and Belz، نويسنده , , J. and Bergman، نويسنده , , D.R. and Cao، نويسنده , , Z. and Chang، نويسنده , , F.Y. and Chen، نويسنده , , C.-C. and Chen، نويسنده , , C.W. and Chen، نويسنده , , P. and Dalton، نويسنده , , M. and Fedorova، نويسنده , , Y. and Field، نويسنده , , C. and Hast، نويسنده , , C. and Huang، نويسنده , , M.A. and Hüntemeyer، نويسنده , , Bibhu P. and Hwang، نويسنده , , W.-Y.P. and Iverson، نويسنده , , R. and Jones، نويسنده , , B.F and Jui، نويسنده , , C.C.H. and Lin، نويسنده , , G.-L. and Loh، نويسنده , , E.C. and Manago، نويسنده , , N. and Martens، نويسنده , , K. and Matthews، نويسنده , , J.N. and Maestas، نويسنده , , M. and Ng، نويسنده , , J.S.T. and Odian، نويسنده , , A. and Reil، نويسنده , , K. and Rodriguez، نويسنده , , D. and Smith، نويسنده , , J. and Sokolsky، نويسنده , , P. and Springer، نويسنده , , R.W. and Thomas، نويسنده , , J. and Thomas، نويسنده , , S. and Thomson، نويسنده , , G. and Walz، نويسنده , , D. and Zech، نويسنده , , A.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
4
From page :
37
To page :
40
Abstract :
A key assumption in the reconstruction of extensive air showers using the air fluorescence technique is that fluorescence is proportional to energy deposition at all depths in the shower. This ansatz, along with the supposition that particle distribution and energy loss can be well modeled by modern shower simulation software, must be thoroughly verified. We report here the results of the first direct measurement of air fluorescence yield as a function of shower depth, as performed in the thick-target phase of the FLASH (FLuorescence in Air from SHowers) experimental program at the SLAC Final-Focus Test Beam facility. We compare observed fluorescence light yields as a function of shower depth to concurrently measured charged particle yields, to the energy deposition predictions of the EGS and GEANT software packages, and to empirical energy-deposition models. We also examine the extent to which the relative yield versus shower depth is independent of wavelength within the fluorescence spectrum. We find the proportionality hypothesis to be well supported by the data, validating the use of fluorescence profiles in the study of ultra high energy cosmic rays.
Keywords :
Ultra high energy cosmic rays , Air fluorescence
Journal title :
Nuclear Instruments and Methods in Physics Research Section A
Serial Year :
2008
Journal title :
Nuclear Instruments and Methods in Physics Research Section A
Record number :
2210469
Link To Document :
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