Abstract
The lifetimes 18.8 ± 1.1, 105 ± 5 and 13 ± 5 fs of the unbound 8488 (4 − 1), 8961 (5 + 1) and 9130 (3 + 2) keV states in 14N, appearing as midget resonances at E p = 1012, 1523 and 1701 keV in the 13C(p, γ) 14N reaction, respectively, have been determined for the first time with the improved DSA method. In the DSA analysis the experimental correction factors of the nuclear and electronic stopping powers were used in combination with Monte Carlo calculations. By the use of the new lifetimes and revised branching ratios, the transition strengths are discussed in terms of shell-model calculations.
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