New Nuclide, Krypton-74

Discovery of the krypton isotopes

“…First reported in the article A New N = Z Isotope: Krypton 72, Schmeing et al made the discovery of 72 Kr in 1973 using the upgraded Chalk River MP tandem [12]. Production of the isotope occurred by the fusion-evaporation reaction of 16 [15]. The isotopes were produced by way of bombarding a lithium bromide target with 280 MeV protons from the Liverpool Synchrocyclotron.…”

“…First reported in the article A New N = Z Isotope: Krypton 72, Schmeing et al made the discovery of 72 Kr in 1973 using the upgraded Chalk River MP tandem [12]. Production of the isotope occurred by the fusion-evaporation reaction of 16 O at 55 MeV with a 58 Ni target, 58 Ni( 16 O,2n) 72 Kr. The reaction products were thermalized in the helium target cell and periodically swept to a shielded counting cell where β -delayed γ-rays were observed.…”

“…The measured half-lives of 12(1) m and 5.5(4) m agree with the accepted values of 11.5 (11) m and 4.29 (17) m for 74 Kr and 75 Kr, respectively. It should be mentioned that Gray et al discovered 74 Kr essentially simultaneously [16]. The two papers were submitted less than a month apart.…”