The identification of the [660] proton orbitals at high spins in rare-earth nuclei

Yang, Chunxiang; Kownacki, J.; Garrett, J.D.; Hagemann, G.B.; Herskind, B.; Bacelar, J. C. S.; Leslie, J. R.; Chapman, R.; Lisle, J.C.; Mo, J.N.; Simcock, A.; Wilmott, J.C.; Waluś, W.; Carlén, L.; Jónsson, S.; Lyttkens, J.; Ryde, H.; Tjøm, P.O.; Walker, P. M.

doi:10.1016/0370-2693(83)90101-6

Cited by 31 publications

(11 citation statements)

References 16 publications

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“…1 c) and optimized the production using 185 MeV 4~ on ~36Ba (see Fig. The earlier reported 184 keV 7-ray [12][13][14][15] was observed in coincidence with tantalum X-rays and the experimental excitation function is given in Fig. The earlier reported 184 keV 7-ray [12][13][14][15] was observed in coincidence with tantalum X-rays and the experimental excitation function is given in Fig.…”

Section: The Decay Of ~71wmentioning

confidence: 92%

Investigation of neutron-deficient tungsten isotopes168?174W

Meißner

Schmidt‐Ott

Freystein

et al. 1990

Z. Physik A - Atomic Nuclei

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The decays of 168-174 w were observed in the reactions of 36Ar and 4~ beams with enriched targets of 136BaF2 and 138BaF2" The measured half-lives are 53 (2) s, 76 (6) s, 2.42(4) min, 2.38(4) rain, 6.6(9) min, 6.3(4) rain, and 35.3(5) rain, respectively. Decay schemes were derived from the 7-and X-ray coincidence data. Spin assignments of ground-and excited states are discussed within experimental level systematics and compared with the results of microscopic-macroscopic model calculations. Excitation energies of modeled one-quasiparticle states were found in reasonable agreement with the experimental data. Allowed unhindered beta decay from the 5/2-[523] to the 7/2-[523] configuration was identified in lVlW and this transition is also proposed for the decays of the even-even isotopes 168, 1vow. PACS: 27.70. + q for half-life measurements. Coincidence data from a standard fast-slow coincidence set-up connecting the 7-and X-ray detector were recorded in list-mode on magnetic tape. Each coincidence event was also tagged with the time elapsed since the last tape movement. Identification of the isotopes ~7-,TS wThe isotopes 167-171W were identified by the measurement of excitation functions of new 7-rays and comparison with those of the ~33Cs(S6Ar, xn)169-XTa reactions ( Fig. 1 a). The evaporation of 3 <_ x < 6 neutrons yielded the well known ?-rays 396, 211, 163, and 159 keV from ~6a-~~176 decays. Gamma rays following the decays of tungsten isotopes were selected by requiring coincidence with tantalum X-rays. Excitation functions of tungsten 7-rays using a ~36Ba target are given in Fig. lb. The comparison in Fig. 1 of the measured yields for 94.4, 178.5, and 169.5 keV ?-rays gives the assignment of these lines to the decays of the nuclei 167W [4], ~68W, and 169W, respectively. Accordingly, the y-rays with energies 316.2 and 184.2 keV, which were observed in 36Ar on ~38Ba reactn .4-r-._d K. oq o~ >-a) 133[s (36Ar,xn)169-XTa 211 keV :~=Ta 163 keV ~5Ta / 10 ~ .... ~6s~ \

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Section: The Decay Of ~71wmentioning

confidence: 92%

Investigation of neutron-deficient tungsten isotopes168?174W

Meißner

Schmidt‐Ott

Freystein

et al. 1990

Z. Physik A - Atomic Nuclei

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“…A spin-parity assignment of 13/2 + for the 1637 keV level can be excluded because no transitions from this state to levels in band 5 with I < 17/2 have been observed. The band members are considered to have a stretched quadrupole characters since (i) the DCO-ratio of the 415.5 keV y-ray is consistent with this assignment and (ii) a band of very similar features has been found in 177Re [1,3]. The latter band is considered to have a 1/2+ [660] configuration.…”

Section: The 1/2 + [660] Sequencementioning

confidence: 95%

“…The alignments of the (+, +)4, (+, -+)5 and (-, +)9 bands are shown in Fig. 4a and those of the Table 2 [1,3] and 171Ta [3,16]. …”

Section: Band Crossings In 179rementioning

confidence: 99%

“…To obtain a better understanding it is important to know the band-crossing behaviour of these bands in 179Re. Furthermore a band of 1/2 + [660] configuration resulting from the i13/2 quasiproton orbital has been found in 17tTa and lVVRe [3]. The excitation energy of this orbital decreases strongly with increasing deformation and it comes close to the Fermi surface for a deformation of /~2 =0.26 in 177Re which is much larger than the ground-state deformation of f12 =0.22 in this nucleus [1].…”

Section: Introductionmentioning

confidence: 99%

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Study of band structures and crossings in179Re

Venkova

Morek

Lieder

et al. 1989

Z. Physik A - Atomic Nuclei

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“…Much of our understanding of the structure of rapidly rotating nuclei is derived from the study of the crossings between such rotational bands (traditionally called "backbends" 1,2 ). Most band crossings are associated with the excitation (often termed "alignment") of a pair of quasiparticles 3,4 (see, however, Yang and co-workers 5 ). Such quasiparticle excitations depend on the existence of pair correlations.…”

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confidence: 99%