▁degrees , ▁causes ▁that ▁the ▁energy ▁spectrum ▁of ▁the ▁neut r ino ▁beam ▁is ▁pe aked ▁around ▁different ▁energ ies ▁for ▁each ▁of ▁the ▁off - axis ▁angles ▁corresponding ▁to ▁the ▁detect ors . ▁Com bin ation ▁of ▁measurements ▁from ▁these ▁detect ors ▁will ▁provide ▁an ▁improved ▁constraint ▁on ▁the ▁neut r ino ▁cross - sections ▁as ▁a ▁function ▁of ▁their ▁energy . ▁ ▁Super - K ami ok ande ▁ ▁Super - K ami ok ande ▁det ector ▁is ▁located ▁ 1 0 0 0 ▁m ▁under ground ▁in ▁the ▁Moz umi ▁Mine , ▁under ▁Mount ▁I ken o ▁in ▁the ▁K ami oka ▁area ▁of ▁H ida ▁city . ▁It ▁is ▁a ▁st ain less ▁steel ▁cyl ind rical ▁tank ▁of ▁about ▁ 4 0 ▁m ▁height ▁and ▁diameter , ▁filled ▁with ▁ 5 0 , 0 0 0 ▁tons ▁of ▁water ▁and ▁instrument ed ▁with ▁around ▁ 1 3 , 0 0 0 ▁phot om ult ip lier ▁tub es ▁( P MT ). ▁It ▁detect s ▁a ▁cone ▁of ▁Ch eren kov ▁light ▁em itted ▁by ▁charged ▁particles ▁moving ▁in ▁water ▁faster ▁than ▁light ▁in ▁this ▁medium . ▁Its ▁goal ▁is ▁to ▁measure ▁mu ons ▁and ▁electrons ▁produced ▁in ▁charged ▁current ▁qu as iel astic ▁interactions ▁( CC Q E ) ▁of ▁ ▁and ▁, ▁respectively . ▁Due ▁to ▁relatively ▁large ▁mass , ▁mu ons ▁usually ▁do ▁not ▁change ▁their ▁direction ▁and ▁thus ▁produce ▁a ▁well - defined ▁cone ▁of ▁Ch eren kov ▁light ▁observed ▁by ▁PM T s