Structure of the neutron-rich nucleus 37 94 rb57

Abstract

A level scheme has been established for 94Rb57 based on studies at the fission-product separator JOSEF of 7-7 coincidences following the/~-decay of 94Kr. For the 190.7 keV level a half-life of 2.5(8) ns has been determined through the centroid-shift method. The major /%decay branch of 94Kr proceeds with log ft=3.7 into the 988.4 keV state in 94Rb. This transition must be of the 0+~ 1 + GT type involving the transition vgT/2--~7Cgg/2. IBFFM calculations have been performed for 94Rb, starting from the parametrization used in the previous IBM investigations for the isotope 93Rb and the isotone 96y. A theoretical interpretation of the low-lying levels including propositions for the spins is given in a comparison to the available data.

β-decay study ofKr94

“…The previously published decay scheme included only 12 firmly established transitions. We confirm the placement of the major transitions, however, some γ-rays previously tentatively assigned (203, 472 keV) were not observed in our experiment or (121 keV, probably corresponding to 119 keV in our work) were assigned to different cascades [3]. The 32.6 keV transition is not detected directly, but its existence is based on clear coincidence between 135 and 187 keV γ-lines.…”

“…Beta-decay of 94 Kr was previously studied experimentally in 1973 (unpublished, although results are cited in [2,3]), 1979 [4], and, most recently, in 1989 [3]. In total, the decay scheme include 12 γ-rays (additional 5 tentatively placed) estabilishing 7 excited states in 94 Rb (additional one state tentatively placed).…”

Penning-trap-assisted study of excitations in Br88 populated in β decay of Se88Czerwiński1, Sieja2, Rza̧ca‐Urban3 et al. 2017Phys. Rev. C74102View full textAdd to dashboardCite

“…Next, when the odd neutron is promoted to the g 7/2 orbital the (πg 9/2 ,νg 7/2 ) j multiplet is formed with spin range 1 + to 8 + . We note that the 1 + member of the (πg 9/2 ,νg 7/2 ) j multiplet, strongly populated in β decay, is reported in a number of rubidium, yttrium, and bromium nuclei [21][22][23][24][25].…”

First decay study of the very neutron-rich isotope93Br

“…So far, the heaviest Z = 37 rubidium isotope studied by γ-spectroscopy is 94 Rb, with N = 57 the nearest neighbor isotone of 93 Kr. Its low-lying levels were interpreted in the interacting boson-fermion-fermion frame as being spherical [10]. Published information on levels in Kr isotopes heavier than 90 Kr remained rather scarce until recently.…”