Nuclear structure of94,95Moat high spins

High-spin states in the nucleiY91andNb95

“…Considering all the possibilities discussed above, we have finally assigned these γ rays to the p2n channel ( 95 Nb). The cross section of this channel, estimated relative to that of the strong xn channels such as 94 Mo and 95 Mo [16] which are well predicted by the CASCADE calculations, is about 5 mb (ca. 2.5% of the total fusion cross section).…”

“…Other channels with two evaporated protons are also predicted with very small cross sections, and in fact, none of the known γ rays of 95 Zr [15] (the 2pn channel) have been observed. The 824.7 keV line is also clearly seen in coincidence with the neutrons; the other two lines in the neutron-coincident spectrum are difficult to distinguish due to their proximity to lines of close energy from the much stronger, dominating channels 4n ( 94 Mo) and 3n ( 95 Mo) [16]. For the strongest γ ray of 824.7 keV, the neutron multiplicity of the channel has been determined from the ratio of its intensity in coincidence with the neutrons and in the singles spectrum (normalized with channels with known neutron multiplicity) as 2.1 ± 0.9.…”

“…Coincidences between all these detectors were registered on the hard disk of a PC and then analyzed off-line by generating γ -ray spectra coincident with neutrons, protons, and α particles, as well as γ -γ coincidence γ -ray spectra measured in the reaction 82 Se + 16 O (48 MeV). The singles and neutron-coincident spectra are dominated by transitions (marked) of the dominant channels 4n ( 84 Mo) and 3n ( 85 Mo) [16]. The transitions labeled with their energies in the bottom spectrum have been assigned to 95 Nb. matrices.…”

“…The first series of experiments were performed at the Bucharest FN tandem accelerator. The beams were 12 C at 38 MeV and 16 O at 48 MeV, with currents typically around 10 particle nA. The target was in both cases a ∼3-mg/cm 2 selenium (enriched 92% in 82 Se), vacuum evaporated onto a 2-mg/cm 2 Au foil.…”

“…The target was 50 mg/cm 2 thick, on a 0.2-mm Ta foil. The nuclei of interest for the present work were populated in the fusion-evaporation reactions of the Se beam with 16 Figs. 4 (upper spectrum) and 5 (lower spectrum).…”