Nuclear data sheets for A = 77

A critical survey of experimental cross section data, comparison with nuclear model calculations and estimation of production yields of 77Br and 77Kr in no-carrier-added form via various nuclear processes

“…The radionuclide 77 Br decays partly by electron capture to the ultrashort-lived 77m Se daughter (T 1/2 = 17.45 s) which has found some application in medical imaging with the Anger camera [8,9]. The branching ratio of 77 Se decay is, however, only 2.17% [10] which is rather low with regard to its use as the generator for diagnostic studies.…”

77Se Low-Energy Levels Fed in 77As ß Decay

“…[5] were absent from our spectra; these Unes may arise from the backscattering peak of the 416 keV 7-ray of a "Ge impurity in the source material as has been suggested in ref. [6]. …”

“…The feeding of excited states in ''Se was computed under the assumption that the 239.011 keV 7-ray accounts for 0.01594 ß decay [6]. The photon intensities (Table 1) were corrected for internal conversion assuming E3 and El multipolarity for 161.932 and 87.854 keV photöns respectively.…”

“…The photon intensities (Table 1) were corrected for internal conversion assuming E3 and El multipolarity for 161.932 and 87.854 keV photöns respectively. Other 7-rays were corrected using tabulated a^ values of Nuclear Data Sheets [6].…”

“…In a more recent study [5], the existence of a new excited State of "Se at 416 keV, not found in nuclear reaction studies, has been suggested on the basis of 7-7 coincidence data. In Nuclear Data Sheets Compilers [6] disagree with this conclusion, arguing that the new 7-rays observed by these authors [5] belong to "Ge decay from which "As had not been separated. Moreover, a new State with/" = 9/2^ at 175 keV, foimd in neutron capture experiments [7] and more recently by a Jülich group [8], should be fed by higher energy levels.…”