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12O (1990AJ01)

(See the Isobar Diagram for 12O)

12O has been observed in the 16O(α, 8He) reaction and in the 12C(π+, π-) reaction: see (1985AJ01). The mass excess of 12O is 32.06 ± 0.04 MeV (1988WA18). 12O is thus unstable to decay into 10C + 2p by 1.78 MeV. See also (1985AN28) and (1987BL18, 1987SA15; theor.).

The width of the ground state is ~ 400 ± 250 keV. The diproton branching ratio of 12Og.s. is estimated to be (60 ± 30)%. It is suggested that the first T = 2 state in 12N should occur at Ex = 12.29 ± 0.02 MeV. There is some indication from the 16O(α, 8He) work of an excited state of 12O at Ex = 1.0 ± 0.1 MeV, which would imply an appreciable downward shift from the position of the analog first excited state in 12Be (1978KE06). See also the spectrum shown as Fig. 1 of (1985MO18).

The 12C(π+, π-) reaction has been studied for Eπ+ = 50 to 240 MeV: see (1985AJ01) and (1985MO18, 1987FA05, 1989GR06). See also (1986GI13), (1989BA1R) and (1986CH39, 1988CO15, 1988GO21, 1988MA27; theor.).