▁the ▁second ▁phase ▁of ▁the ▁T 2 K ▁experiment ▁( T 2 K - II ). ▁In ▁ 2 0 2 5 , ▁the ▁successor ▁of ▁the ▁T 2 K ▁experiment ▁will ▁be ▁launched , ▁the ▁Hyper - K ami ok ande ▁( H K ) ▁experiment , ▁with ▁the ▁new , ▁ 2 5 0 , 0 0 0 - ton ▁water ▁Ch eren kov ▁far ▁det ector ▁- ▁the ▁Hyper - K ami ok ande ▁det ector . ▁The ▁building ▁of ▁an ▁additional ▁Inter mediate ▁Water ▁Ch eren kov ▁det ector ▁at ▁a ▁distance ▁of ▁around ▁ 2   km ▁is ▁also ▁considered ▁for ▁the ▁H K ▁experiment . ▁ ▁T 2 K - II ▁ ▁The ▁phase ▁II ▁of ▁the ▁T 2 K ▁experiment ▁is ▁expected ▁to ▁start ▁in ▁ 2 0 2 2 ▁and ▁last ▁until ▁ 2 0 2 5 ▁or ▁ 2 0 2 6 ▁following ▁by ▁the ▁H K ▁experiment ▁commence . ▁The ▁physics ▁goals ▁of ▁T 2 K - II ▁are ▁a ▁measurement ▁of ▁the ▁oscill ation ▁parameters ▁ θ 2 3 ▁and ▁ Δ m ▁with ▁a ▁precision ▁of ▁ 1 . 7 ° ▁and ▁ 1 %, ▁respectively , ▁as ▁well ▁as ▁a ▁confirm ation ▁at ▁the ▁level ▁of ▁ 3 ▁ σ ▁or ▁more ▁the ▁matter - ant im atter ▁asym met ry ▁in ▁the ▁neut r ino ▁sector ▁in ▁a ▁wide ▁range ▁of ▁possible ▁true ▁values ▁of ▁ δ CP ▁- ▁the ▁parameter ▁responsible ▁for ▁the ▁CP ▁( m atter -