Nuclear spectroscopy with lithium beams. I. High-spin states in ^{55}Fe, ^{55}Mn, and ^{53}Cr

The 7Li bombardment of 5IV has been used in conjunction with recoil distance lifetime (RDM), y-y coincidence, angular d stribution, and Doppler shift attenuation lifetime (DSAM) measurements to gain information on the properties of high-spin states in the nuclei 5~Fe, ~~Mn, and 5~Cr. Mean lifetimes (T) determined by RDM were as follows —in "Fe: 1409-keV level (v = 57.8 + 3.5 psec), 2813 (14.5+ 3.1 psec), 5099 (32.3 +1.1 psec); in Mn: 126-keV level (&=382+16 psec); in ~Cr: 2173-keV level (&=47+15 psec); 3084 (7'=-43+15 psec). Tentative spin assignments were made as follows —in 5 Fe: 5099-keV level J= (+, 6526, Z= ( & ), in ~5Mn: 5056-keV level J = (~&). Lifetimes (or limits) were also established from DSAM measurements for a number of other levels in the above nuclei ~ The results are compared to shell model calculations.