▁as ▁a ▁clear , ▁sharp ▁ring . ▁In ▁contrast , ▁electrons , ▁because ▁of ▁smaller ▁mass , ▁are ▁more ▁sus cept ible ▁to ▁scatter ing ▁and ▁almost ▁always ▁produce ▁elect romagnet ic ▁show ers , ▁observed ▁by ▁PM T s ▁as ▁a ▁ring ▁with ▁f uz zy ▁edges . ▁Ne ut r ino ▁energy ▁is ▁calculated ▁based ▁on ▁the ▁direction ▁and ▁energy ▁of ▁a ▁charged ▁le pton ▁produced ▁in ▁the ▁CC Q E ▁interaction . ▁In ▁this ▁way , ▁ ▁and ▁ ▁spect ra ▁are ▁determined , ▁leading ▁to ▁the ▁measurement ▁of ▁the ▁oscill ation ▁parameters ▁relevant ▁for ▁mu on ▁neut r ino ▁disapp earance ▁and ▁electron ▁neut r ino ▁appearance . ▁ ▁History ▁ ▁T 2 K ▁is ▁a ▁successor ▁of ▁the ▁K E K ▁to ▁K ami oka ▁( K 2 K ) ▁experiment , ▁which ▁ran ▁from ▁ 1 9 9 9 ▁till ▁ 2 0 0 4 . ▁In ▁the ▁K 2 K ▁experiment , ▁an ▁acceler ator ▁beam ▁of ▁mu on ▁neut r inos ▁was ▁produced ▁at ▁K E K ▁facility ▁in ▁T su k uba ▁( J apan ) ▁and ▁sent ▁towards ▁the ▁Super - K ami ok ande ▁det ector , ▁located ▁ 2 5 0   km ▁away . ▁The ▁K 2 K ▁experiment ▁results ▁confirmed ▁at ▁the ▁level ▁of ▁at ▁ 9 9 . 9 9 8 5 % ▁confidence ▁( 4 . 3 ▁ σ ) ▁the ▁disapp earance ▁of ▁the ▁mu on ▁neut r inos ▁and ▁were ▁consistent ▁with ▁the ▁previous ▁measurements