Rotational bands inRb76

Abstract

High spin states in Rb were investigated via the reaction Ca( Ca, 3pn) Rb at 128 MeV. The level scheme was established from pp, gpss and recoil-p coincidences measured in the EUROGAM I array in combination with the Daresbury recoil separator. The known rotational bands were extended up to the excitation energy E = 9.2 MeV and spins I = (21+) and (19 ). The band head energies could be fixed by many interband transitions. Two new bands were identified. The level scheme is discussed in terms of the cranked shell model. In the negative parity bands Rb behaves like a rigid rotor until the first band crossings.PACS number(s): 21.10. Re, 23.20.Lv, 21.60.Ev, 27.50.+e

Collective excitations and shape changes inY80

“…Such behavior is rather difficult to interpret theoretically because of mixing between different single-particle configurations, but it probably is a good indicator of structure changes. A similar (but perhaps more gradual) increase occurs in the signature splitting pattern of the yrast negativeparity band in 76 Rb near the point at which a proton band crossing was observed ͑ប = 0.69 MeV͒ [54]. Increased alternations in the signature splitting pattern were accompanied by a phase reversal in the lowest negative-parity band of odd-odd 86 Nb [55].…”

“…The 54 Fe͑ 28 Si, pn͒ reaction at 90 MeV, performed at the Florida State University (FSU) Tandem-Superconducting LINAC accelerator, was used to populate the excited states. The isotopically-enriched 54 Fe target was thick enough to stop completely all recoils and hence allowed for the analysis of line shape spectra. The FSU array consisting of ten Compton-suppressed Ge detectors (three of which were of the high-efficiency Clover design) was used to detect ␥ − ␥ coincidences.…”

“…High-spin states in 80 Y were produced following the 54 Fe͑ 28 Si, pn͒ fusion-evaporation reaction at 90 MeV using the Tandem-Superconducting LINAC accelerator at Florida State University (FSU). (The beam energy was chosen to optimize the production cross section of 80 Y according to PACE2 calculations and a measurement of the relative excitation function.)…”

Deformation of Sr and Rb isotopes close to theN=Zline viaβ-decay studies using the total absorption technique

“…This final state would correspond to the 0 + ground state in the daughter nucleus. In the 76 Rb parent case, the ground state has a (π [301]3/2 − − ν[422]5/2 + )1 − configuration [41] and therefore this decay is not allowed. On the other hand, the 78 Rb parent is assumed to have a (π [312]3/2 − -ν[301]3/2 − )0 + configuration, as concluded in [19].…”

Identification ofT=0andT=1Bands in theRudolph1, Gross2, Sheikh3 et al. 1996Phys. Rev. Lett.Self Cite1104450View full textAdd to dashboardCite

“…These nuclei develop several strongly coupled DI 1 rotational bands at very low excitation energies [15]. It is interesting to note that the presumed 4 1 !…”