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overview of what is in the MC

overview of what is in the MC. A.Margiotta 17/05/2011. Relevant water properties to our MC. absorption length scattering length v olume function refraction index : refr_index @ 460 nm n group = 1.3499 (= n phase ) + 0.0298 =1.3797. e ffective attenuation length. e ffective

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overview of what is in the MC

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  1. overview of whatis in the MC A.Margiotta 17/05/2011

  2. Relevant water properties to our MC • absorptionlength • scatteringlength • volume function • refractionindex : refr_index @ 460 nm ngroup= 1.3499 (=nphase) + 0.0298 =1.3797 effective attenuation length effective scattering length

  3. absorptionlength publishedvalue in Astrop. Phys. 23 (2005) 131 ≈ 60 m max (@470nm) = 55 m in “OFFICIAL” simulations (dec08 photontables) : ** RBR v0.1 ** Aart “SoSapproach”

  4. scatteringlength scatteringcoeff. b = 1/λcalculated from Kopelevichparam. Model: partic-0.0075 vs=vl = 0.0075 ppm λsct= 52.8 m @ 460 nm

  5. scatteringfunction 〈cosθ〉= 0.77 β (θ) = ηβRay(θ) + (1 –η) βpart(θ) η = 17 % βRay molecular scattering βRay(θ) = 0.06225 * ( 1+0.835 cos(θ)) βpar particulate scattering is provided with a table λsct= 52.8 m  λscteff= 230 m @ 460 nm

  6. attenuationlength λatteff≈ 44 m @ 460 nm

  7. they are used in: • Geasim : light from particles in showers NC and CC interactions NO SCATTERING • KM3 package (GEN code) : light from muons (track and e.m. showers)  photontable production SCATTERING NO wavelengthdependence of ngroup WORK IN PROGRESS : KM3 v4rx (seeCorey’s talk)

  8. impact • Reliable input values are essential • Δλabs =+/- 10%  Δreco_tracksaround 20% • oldstudy on scatteringmodelsindicatesimportanteffect on zenith angle distribution • waiting ……..

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