Lifetimes of Levels in ${}^{12}C$ , ${}^{13}C$ , and ${}^{13}N$

The Doppler-shift method is used to obtain lifetime limits of

τ < 10

fsec and

τ < 26

fsec for the 3.09- and 3.68-MeV levels of

{}^{13}C

, respectively. The radiative width

Γ_{γ}

is remeasured for the 2.37-MeV state of

{}^{13}N

in the reaction

{}^{12}C (p, γ) {}^{13}N

and found to be 0.45±0.05 eV, corresponding to

τ = 1.47 \pm 0.15

fsec. Thus, the disagreement previously reported between the first excited analog levels is not confirmed. A total width

Γ = 34 \pm 1

keV is found for the level in

{}^{13}N

. The Doppler-shift limits are substantiated by observing a lifetime of 55±7 fsec for the 4.43-MeV level of

{}^{12}C

. For the 3.86-MeV level of

{}^{13}C

, a lifetime of

{9.0}_{- 1.5}^{+ 2.5}

psec is obtained.

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Lifetimes of Levels inC12,C13, andN13