High-spin states in 163–166Hf

Blume, K.P.; Hübel, H.; Murzel, M.; Recht, J.; Theine, K.; Kluge, H.; Kuhnert, A.; Maier, K. H.; Maj, A.; Guttormsen, M.; Lima, A.P. de

doi:10.1016/0375-9474(87)90310-1

Cited by 52 publications

(33 citation statements)

References 12 publications

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“…For convenience of discussion, these sequences will be loosely referred to as "bands", as is customary, even though each sequence corresponds only to a signature of a band. Bands 1 and 4 were observed previously [14]; all others were identified here for the first time. Table I lists the energy levels and γ−ray transitions, as well as the measured γ-ray intensities and DCO ratios.…”

Section: Level Schemementioning

confidence: 49%

“…A previous spectroscopy study of 163 [14]. Although the present study did not lead to the discovery of TSD bands in 163 Hf, several other noteworthy features were revealed.…”

Section: Introductionmentioning

confidence: 81%

“…Bands 1 and 4 were identified previously [14]. Based on the level systematics and Nilsson model calculations, Blume et al identified band 1 as the neutron i 13/2 sequence built on the 13/2 + state, and concluded that this state is not the ground state.…”

Section: Level Schemementioning

confidence: 99%

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Multiple excitation modes inHf163

Yadav

Marsh

et al. 2014

Phys. Rev. C

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Excited states of163 Hf were populated using the 94 Zr( 74 Ge,5n) reaction and the decay γ rays were measured with the Gammasphere spectrometer. Two previously known bands were extended to higher spins, and nine new bands were identified. In addition to bands associated with threeand five-quasiparticle configurations, two γ−vibrational bands coupled to the i 13/2 excitation were also observed. The lowest level of a newly-identified, negative-parity band is proposed to be the ground state of the nucleus. A systematic delay of the high-spin proton crossing frequency with increasing quadrupole deformation from 162 Hf to 172 Hf was established. Extensive band searches failed to reveal a triaxial, strongly-deformed structure in 163 Hf similar to the one observed in several nuclei around A ∼ 165.

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Section: Level Schemementioning

confidence: 49%

“…A previous spectroscopy study of 163 [14]. Although the present study did not lead to the discovery of TSD bands in 163 Hf, several other noteworthy features were revealed.…”

Section: Introductionmentioning

confidence: 81%

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Multiple excitation modes inHf163

Yadav

Marsh

et al. 2014

Phys. Rev. C

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“…3(a). As discussed in previous papers [27,28], the GSB undergoes the lowest i 13/2 neutron band crossing (AB crossing) aroundhω ∼ 260 keV. Bands AE and AF, the lowest negative-parity signature-partner bands, undergo the second lowest i 13/2 neutron band crossing (BC crossing) at hω ∼ 320 keV.…”

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confidence: 94%

“…2. Previously, the ground-state band (GSB) and the two negative-parity bands AE and AF were observed up to the 28 + , 31 − , and 30 − levels, respectively [27,28]. The letter A in the band labels denotes the νi 13/2 orbital, and the letter E (F) corresponds to the positive (negative) signature of the lowest negative-parity neutron orbital.…”

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confidence: 99%

Identification of triaxial strongly deformed bands in164Hf

Marsh

Hagemann³

et al. 2013

Phys. Rev. C

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E ?-E ? correlation studies of light-mass Hf isotopes

Theine

Blume

Hübel

et al. 1989

Z. Physik A - Atomic Nuclei

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Abstract:Gamma-ray energy correlations have been measured for several reactions leading to lightmass Hf isotopes with 160 -~ A ~ 166. The correlation spectra show ridge-valley structures up to high rotational frequencies from which a drop in j(2) o is deduced at high frequencies. This drop suggests that a large portion of the angular momentum is generated by aligning particles. It may also be explained by the theoretically predicted triaxial states with large deformation.The~-ray spectra emitted by evaporation residues produced in compound nucleus reactions consist of both, discrete lines and an unresolved part, the quasi-continuum. Since the limit for the observation of discrete lines is reached at a spin of about 40 15 in most well deformed nuclei, information on higher-spin states has to be extracted from quasicontinuum spectra. A powerful tool to determine nuclear properties in the high-spin region from continuum spectra is the analysis of E~f-E x` correlations (1).In the first Ey-Ea~ correlation studies NaI(TI) detectors were used (1). They have good photo absorption efficiencies and the correction for uncorrelated events can be made quite reliably. On the other hand, their energy resolution is rather poor which causes problems in the analysis of the correlation spectra. In particular, it is difficult to separate discrete line features from the ridge-valley structures produced by the unresolved bands. More recently, Compton-suppressed Ge detectors were employed which show peak to Compton ratios comparable to those of NaI(TI) detectors, but have much better energy resolution. In this work we report on an investigation of the E~;-E~, correlations in 1-60-]66-Hf using multidetector arrays of CSS. From the ridge-valley stru~yres we deduce dynamical moments of inertia J~J up to high rotational frequencies. This investigation is part of the work to study the high-spin discrete level structure of the light-mass Hf isotopes.High-spin states in the liKht Hf isotopes were populated in 144'148Sm + 20'22Ne and 126Te + 40Ca compound reactions and in-beam bY-ray coincidences were measured with the OSIRIS array at the VICKSI accelerator of the HMI Berlin (2) and with the HERA array at the 88" cyclotron of the LBL Berkeley {3}. In all exReriments stacks of two or three thin (-500, pg/em ~} meta]lj~ foils of tb~enriched isotopes (t~r 96,5%; 14nSm: 95 %; JZbTe: 98%) were used as targets. The reaction products were allowed to recoil into vacuum and the y-rays emitted by the recoiling nuclei were fully Dopplersh i fted.In the off-line analysis the coincidences were sorted into EK1 -EK 2 matrices with an energy resolution of 4 keV/cSannel. No reaction channel selection could be applied, but in all cases the 4n-channel was dominant -in particular at high spins. In the correlation matrices a correction for the uncorrelated events has to be applied. We followed the approach by Andersen et al. (I) to subtract the uncorrelated events (COR-method). In order to distinguish the continuum ridges from effects caused by discrete lines or ...

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High-spin states in 163–166Hf

Cited by 52 publications

References 12 publications

Multiple excitation modes inHf163

Multiple excitation modes inHf163

Identification of triaxial strongly deformed bands in164Hf

E ?-E ? correlation studies of light-mass Hf isotopes

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