Gamma Rays from the New Isotope (3.6 + 0.2) min ⁷⁷Rb

Beta-decay energies and masses of short-lived isotopes of rubidium, caesium, francium, and radium

“…The fl-7 decay of this nuclide has been observed by several authors [13,[37][38][39][40][41][42]. A scheme of excited levels in 77Kr fed by the 77Rb decay was established by Gamma-ray energies from the present work {without superscript) are good to + 2 keV.…”

Discovery of rubidium, strontium, molybdenum, and rhodium isotopes

“…This half-life agrees with the presently accepted value of 3.77(4) min. About a year earlier Velandia et al reported a half-life of 6.1(5) min [28], however, these results were discredited by de Boer et al only a month after the paper by Arlt et al: "The most embarrassing point is that a 146.5 keV gamma ray which according to Borchert [29] should be 31 times stronger than the 106.2 keV gamma ray, is not seen by Velandia et al" [30]. Also, a previously reported half-life of 2.8 (10) min was assigned to either 77 Rb or a 77 Kr isomer [31].…”

Rotational bands in77Kr

“…From the fl decay of 77Kr two contradictory assignments for the ground state spin of 77Kr have been deduced: 5/2- [6] and 7/2 + [7]. Transitions in 77Kr are known from fl decay studies of 77Rb [8][9][10]5].…”