The lowest negative parity state in 21Na

On21Na states betweenE x=5.5 and 6.2 MeV

“…Many experimental studies have been performed on the 2tNa nucleus [1] and have led to definite spin and parity assignments for most of the states with E~<5.5 MeV [2][3][4][5][6][7][8][9][10]. Between 5.5 and 6.ZMeV, the situation is not so clear.…”