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A Q-value measurement of the ⁴⁸Ca(¹⁸O, ¹⁷C)⁴⁹Ti reaction leads to an atomic mass excess of 21.039 ± 20 keV (1982FI10; E(¹⁸O) = 112 MeV) for ¹⁷C, using the (1985WA02) a.m.e. values for ¹⁸O, ⁴⁸Ca and ⁴⁹Ti. See also (1982AJ01). ¹⁷C is then stable with respect to ¹⁶C + n by 0.73 MeV. E_β^-(max) to ¹⁷N_g.s. = 13.17 MeV. See also (1984KL06). The half-life of ¹⁷C is 202 ± 17 msec (1986CU01). An excited state of ¹⁷C is reported at E_x = 292 ± 20 keV [see (1982AJ01)], 295 ± 10 keV (1982FI10). Three closely spaced low-lying states are expected [J^π = 5/2⁺, 3/2⁺, 1/2⁺] (1982CUZZ): it is not clear which is the assignment of the ground state. See also (1982AJ01), (1982OR1D, 1984HI1A) and (1983ANZQ, 1983FR1A, 1983WI1A, 1984AS1D; theor.).