21C     ADOPTED LEVELS:UNOBSERVED     1985LA03,2013Mo12         15NDS    202205
 21C   H TYP=FUL$AUT=R.B. FIRESTONE$CIT=NDS 127, 1 (2015)$CUT=1-May-2022$       
 21C   H TYP=UPD$AUT=E.A. McCutchan$DAT=1-May-2022$COM=Updated cut-off date     
 21C   Q  20390    SY   -10  SY  28780 SY              2012WA38                 
 21C  c  Nonexistence determined in Ta({+40}Ar,X) by 1985La03. Unstable to      
 21C 2c  g.s. neutron decay. Confirmed by 2013Mo12 via single proton            
 21C 3c  removal reaction from beam of {+22}N at 68MeV/u. Three-body model      
 21C 4c  calculation suggests that {+22}C is bound by less than 70 keV.