Shape coexistence at high spin in187Au

Bourgeois, C.; Porquet, M. G.; Perrin, N.; Sergolle, H.; Hannachi, F.; Bastin, GF Giel; Beck, F.A.

doi:10.1007/bf01290104

Cited by 12 publications

(21 citation statements)

References 28 publications

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“…3 where a partial level scheme extracted from [4] is shown. We have measured the y-ray intensities from several gated spectra at 90, 95 and 100 MeV beam energy: we observe that the intensities of the y-rays belonging to the oblate and the prolate systems both increase in the interval of 90-95 MeV though the former increases much faster than the later.…”

Section: Resultsmentioning

confidence: 99%

“…Theoretical calculations [2,3] using a deformed harmonic oscillator and a WoodsSaxon potential respectively, indicated that this shape coexistence survives up to spin 50 h. Recent experiments [4,5] clearly established that both prolate and oblate shapes survive well separated up to high spin (57/2 h in [4]). …”

Section: Introductionmentioning

confidence: 93%

“…The high spin states of 187Au in [4] were populated through the 172yb(19F, 4n) reaction at 95 MeV and studied with in-beam spectroscopic techniques using the "Chgtteau de Cristal" 4re multidetector array. In this paper, we present the study of the population of the prolate and oblate structures of 187Au using the 19F-t-172Yb reaction at various beam energies.…”

Section: Introductionmentioning

confidence: 99%

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Relative population of the oblate and prolate structures in187Au

Korichi

Perrin

Bourgeois

et al. 1992

Z. Physik A - Hadrons and Nuclei

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The population of the oblate and the prolate structures in 18VAu has been studied using the "Chfiteau de Cristal" set-up through the 172yb(19F, 4n) reaction at 90, 95 and 100 MeV beam energy. 7-7, ?'-Fold and 7-Sum energy coincidence measurements were performed. 7-ray intensity measurements showed that as the beam energy increases the prolate system is less populated than the oblate one. Fold and Sum-energy associated with oblate and prolate structures showed a different behaviour with increasing beam energy. Two mechanisms are suggested to explain these results.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relative population of the oblate and prolate structures in187Au

Korichi

Perrin

Bourgeois

et al. 1992

Z. Physik A - Hadrons and Nuclei

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“…Whereas the oblate band, developed on the πh 11/2 state is more irregular. Moreover assignement of spins and parities for the observed levels is not obvious; this band would end at spin 27/2 − or 25/2 − depending on the authors [4,5].…”

Section: Negative Parity High Spin Levelsmentioning

confidence: 94%

g factor measurements of high spin isomeric states in 187,189,191 Au

Perrin¹,

Bourgeois²,

Korichi³

et al. 1997

Z Phys A - Particles and Fields

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The g factors of three high spin isomers in 187,189,191 Au have been measured, using the time differential perturbed angular distributions. The reactions used and the results obtained for the g factors and the lifetimes are: 172 Yb( 19 F, 4nγ) 187 Au, g (31/2 − or 35/2 − ) = 0.25 (3), T 1/2 = 102 (5) ns; 181 Ta( 12 C, 4nγ) 189 Au, g (31/2 + ) = 0.42 (2), T 1/2 = 242 (10) ns; and 176 Yb( 19 F, 4nγ) 191 Au, g (31/2 + ) = 0.42 (3) T 1/2 = 402 (20) ns. These results show that the structure of these isomers is consistent with a 1 proton, 2 neutrons structure. The experimental set-up was cheked by measuring the g factor of the Coulomb excited 197 keV, T

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“…The lighter isotopes are prolate deformed. By adding more and more neutrons, the shape becomes oblate with the quadrupole deformation parameter β 2 [1] taking values β 2 ≤ 0.15 [2][3][4]. A prolate-oblate shape change has been discussed for these nuclei [5][6][7][8][9][10][11].…”

mentioning

confidence: 99%

Triaxial deformation and nuclear shape transition in192Au

Öktem¹,

Balabanski

Akkuš³

et al. 2012

Phys. Rev. C

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Background : Nuclei in A ≈ 190 mass region show gradual shape changes from prolate through non-axial deformed shapes and ultimately towards spherical shapes as the Pb region is approached. Exploring how this shape evolution occurs will help understand the evolution of collectivity in this region. Purpose : The level scheme of the 192 Au nucleus in A ≈ 190 region was studied in order to deduce its deformations. Methods : High-spin states of 192 Au have been populated in the 186 W( 11 B, 5n) reaction at a beam energy of 68 MeV and their γ decay was studied using the YRAST Ball detector array at the WNSL, Yale University. Results : Based on double and triple γ-ray coincidence data the level scheme of 192 Au has been extended up to I π = 32 + at an excitation energy of ∼ 6 MeV. Conclusion : The results are discussed in the framework of pairing and deformation self-consistent Total Routhian Surface (TRS) and Cranked Shell Model (CSM) calculations. The comparison of the experimental observations with the calculations indicates that this nucleus takes non-axial shape similar to other Au nuclei in this region.

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Shape coexistence at high spin in187Au

Cited by 12 publications

References 28 publications

Relative population of the oblate and prolate structures in187Au

Relative population of the oblate and prolate structures in187Au

g factor measurements of high spin isomeric states in 187,189,191 Au

Triaxial deformation and nuclear shape transition in192Au

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