Band structures in73Se

Seiffert, F.; Schwengner, R.; Winter, G.; Funke, L.; Lieberz, W.; Reinhardt, R.; Schmittgen, K. P.; Weil, David A.; Wrzal, R.; Zell, K. O.; Brentano, P. von

doi:10.1007/bf01303825

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…In case of the 9/2 + yrare band we even have an experimental hint for oblate deformation: in the isotone 73Se the 9/2 + ground-state band exhibits the same pattern of a strong signature splitting. Here the mixing ratio of the first A1 = 1 transition has been determined revealing a positive sign, from which an oblate deformation for the low spin levels has been infered [59]. Thus, we now consider the low spin level scheme to be dominated by prolate-oblate shape coexistence.…”

Section: Opposite Deformation Of Yrast and Yrare Bandmentioning

confidence: 99%

Prolate-oblate shape coexistence in 75Kr

et al. 1998

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The collective bands of 75Kr were extended up to spin 45/2 using the compound reactions 5°Cr(28Si,2pn), 54Fe(24Mg,2pn) and 58Ni(2°Ne,2pn)YSKr. Lifetimes were measured by RDDS with nine OSIRIS detectors in coincidence. Mixing ratios were determined by measurements of internal conversion coefficients, angular distribution and correlations. Deviations between different measurements are explained by the short lifetimes leading to angle dependent intensity losses due to Doppler shift. Spins and parities were assigned from angular distributions, excitation functions and DCO ratios measured with the OSIRIS_12 spectrometer. The band head spin of the negative parity yrast band was established as 3/2 via DCO ratios and internal conversion coefficients. Further bands at low excitation energy were found. In accordance to Woods-Saxon cranking model calculations, these weaker populated sidebands are interpreted to be built on oblate deformed intrinsic states (/32 ~ -0.2), while the strongly populated bands are built on prolate deformed states (~2 ~ +0.4). The interpretation of the lqp g9/2 yrare band, to be generated from oblate deformation, is further supported by A1 = 0 transitions into the yrast band and a similar oblate deformed g9/z structure in the isotone 73Se. The experimental level energies, branching ratios, transition probabilities and mixing ratios are compared to rotor model calculations. The deviations between experiment and rotor model calculations are interpreted to be based on mixing between prolate and oblate states.

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Section: Opposite Deformation Of Yrast and Yrare Bandmentioning

confidence: 99%

Prolate-oblate shape coexistence in 75Kr

et al. 1998

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“…The employment of the neutron orbital [301]2 is supported by the observation of rotational bands built on low-lying 2 isomeric states in the neighboring odd-neutron nuclei 7sSe [37] and "s 77Kr [5,28,29]. The proton orbital [431]2+ had to be used in order to get K" = 0 and is now justified through its inclusion in the configuration of the low-lying 4~+~i somer.…”

Section: Magnetic Moment Of the 4and+~i Somermentioning

confidence: 99%

“…For oblate deformation the high-0 members of the g9/2 subshell are lowered in energy and can be occupied by a valence proton or neutron. The occurrence of triaxiality or oblate deformation at low excitation energies has recently been discussed in both the odd-proton nucleus 7sBr [27,33] and the odd-neutron nuclei "s 7sSe [37,42] and TsKr [28].…”

Section: Other High-spin 2-gp Statesmentioning

confidence: 99%

Energy of the4(+)isomer and new bands in the odd-odd nucleusBr
Döring¹,
Jw²,
Td³
et al. 1993
Phys. Rev. C
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5
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High-spin states of the odd-odd nucleus Br were investigated via the reactions Ni(' F,2pn) Br and Cu(' C, 3n) Br at beam energies of 62 and 50 MeV, respectively. On the basis of coincidence data new levels have been introduced and partly grouped into rotational bands, Some of these new states decay to known levels of negative-parity bands built on both the ground state and the long-lived 4 isomer. Thus, an excitation energy of 13.8 keV has been deduced for the long-lived isomer in " Br. The level sequences observed are interpreted in terms of Nilsson configurations in conjunction with collective excitations.

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