β decay of the πf5/2 ground state of Cu77 studied with 225 MeV and 0.2 MeV purified radioactive beams
Isobarically purified beams of Cu77 with energies of 225 and 0.2 MeV were used at the Holifield Radioactive Ion Beam Facility of Oak Ridge National Laboratory to study β decay into states in Zn77. Data taken at 225 MeV allowed the determination of absolute branching ratios relative to the decay of Cu77 for this β decay as well as its daughters. From these we obtained a refined β-delayed neutron emission probability of 30.3(22)% and a probability that the decay proceeds through Zn77g of 49.1(26)%. A total of 64 γ rays were placed in a level scheme for Zn77 containing 35 excited states including one state above the neutron separation energy, whereas two γ rays were observed for the βn branch to states in Zn76. The growth and decay curves of some prominent γ rays indicate a single β-decaying state with a half-life of 480(9)ms. The decay pattern for Cu77, with observed feeding of 8(3)% to 7/2+Zn 77g and 6(3)% to 1/2-Zn77m, in contrast to the large feeding observed for decay of πp3/2 Cu73g to 1/2-Zn 73g, strongly suggests a πf5/2 ground state for the studied Cu77 activity. © 2009 The American Physical Society.
Publication Source (Journal or Book title)
Physical Review C - Nuclear Physics
Ilyushkin, S., Winger, J., Gross, C., Rykaczewski, K., Batchelder, J., Cartegni, L., Darby, I., Goodin, C., Grzywacz, R., Hamilton, J., Korgul, A., Królas, W., Liddick, S., Mazzocchi, C., Padgett, S., Piechaczek, A., Rajabali, M., Shapira, D., & Zganjar, E. (2009). β decay of the πf5/2 ground state of Cu77 studied with 225 MeV and 0.2 MeV purified radioactive beams. Physical Review C - Nuclear Physics, 80 (5) https://doi.org/10.1103/PhysRevC.80.054304