Study of short-lived bromine isotopes

First experiments in the systematic study of the structure of ground states and isomeric states of Br isotopes as function of neutron number at ISOLDE, CERN are reported. The isotopes^{74g.74m,77,78,84g,84m}Br have been implanted into iron and studied with the techniques of low temperature nuclear orientation and nuclear magnetic resonance of oriented nuclei (NMR/ON). The experiments were performed with the NICOLE on-line nuclear orientation set-up using the isotope separator ISOLDE-3. NMR/ON experiments were successful for^74mBr with continuous on-line implantation and for⁷⁷Br. Using as value of the hyperfine field B_hf(BrFe)=+81.3S (3) T we obtain |g (^74mBr)|=0.455 (3) and |g (⁷⁷Br)|=0.6492 (3). Static nuclear orientation data have been measured for all above mentioned isotopes. From these data we derive |μ(⁷⁸Br, I=1)|=0.13 (3) and |μ(^84gBr, I=2)|=1.9 (7). The results are discussed within the systematics of the bromine isotopes.