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1

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Shape coexistence at high spin in187Au (1989)

Bourgeois, C. ; Porquet, M. G. ; Perrin, N. ; [et al.]

Springer

The European physical journal 333 (1989), S. 5-14

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20.Lv ; 27.70.+q

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract High-spin states in187Au have been populated in the172Yb(19F, 4n) reaction and studied with in-beam spectroscopic techniques using the “Château de Cristal” 4π-multidetector array. A comprehensive level scheme of187Au has been established. Experimental band crossing frequencies and gains in alignment were deduced. Shape coexistence in187Au, well established at low spin, is found to survive up to spin 57/2, and manifests itself through well separated oblate and prolate structures.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01290104

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2

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First evidence of the magnetic character of dipole transitions in the “oblate bands” of199Pb (1994)

Duprat, J. ; Vieu, C. ; Azaiez, F. ; [et al.]

Springer

The European physical journal 347 (1994), S. 289-290

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20.Lv ; 27.80+w

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Internal conversion coefficients have been determined from online measurement of electron- and y- ray emission related to the dipole transitions in the so-called oblate collective bands in 199Pb.The results strongly support the M1 (or M1+E2) character of these transitions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01289799

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3

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Confirmation of the existence of a superdeformed rotational band in192Pb (1995)

Ducroux, L. ; Astier, A. ; Béraud, R. ; [et al.]

Springer

The European physical journal 352 (1995), S. 13-14

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20.Lv ; 27.80.+w

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract A controversy has arisen over the existence, or not, of a superdeformed rotational band in192Pb. We have carried out an experiment using the168Er(3OSi, 6n)192Pb reaction at 159 MeV and have observed the coincidentγ rays in the EUROGAM 2 spectrometer. We confirm the original result of Henry et al. that a superdeformed band exists in192Pb.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01292756

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4

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Relative population of oblate and prolate structures in189Au (1993)

Perrin, N. ; Korichi, A. ; Bourgeois, C. ; [et al.]

Springer

The European physical journal 347 (1993), S. 81-85

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20.Lv ; 27.70.+ q

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract High spin states of189Au were populated via the174Yb (19F, 4n reaction at 86, 90, 95 and 100 MeV beam energies. The study of the relative population of oblate and prolate structures shows a striking disappearance of the prolate band relative to the oblate ones as the beam energy goes from 86 to 100 MeV.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01284673

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5

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Collective structures in185Hg (1988)

Hannachi, F. ; Bastin, G. ; Porquet, M. G. ; [et al.]

Springer

The European physical journal 330 (1988), S. 15-22

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20. Lv ; 27.70. +q

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Excited states of185Hg have been investigated via the161Dy(28Si, 4n) reaction at 145 MeV. In-beamγ-ray spectroscopic studies have been performed with the “Château de Cristal” 4π-multidetector array. A level scheme of185Hg has been established. Shape coexistence, still present in185Hg like in the neighbouring Hg isotopes, manifests itself through a weakly populated decoupled band built on the 13/2+ isomer and three strongly-coupled bands built on the prolate 1/2− [521], 7/2− [514], and 9/2+ [624] Nilsson states.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01287258

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6

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Relative population of the oblate and prolate structures in187Au (1992)

Korichi, A. ; Perrin, N. ; Bourgeois, C. ; [et al.]

Springer

The European physical journal 343 (1992), S. 15-19

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20.Lv ; 27.70. + q

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The population of the oblate and the prolate structures in187Au has been studied using the “Château de Cristal” set-up through the172Yb(19F, 4n) reaction at 90, 95 and 100 MeV beam energy. γ — γ, γ-Fold and γ -Sum energy coincidence measurements were performed, γ-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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01291591

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7

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Rotational bands in201Pb (1992)

Baldsiefen, G. ; Hübel, H. ; Azaiez, F. ; [et al.]

Springer

The European physical journal 343 (1992), S. 245-246

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20.Lv ; 27.80+w

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract High-spin states in 201 P6 were populated in the 192 Os(14 C, 5n)201 Pb reaction at a beam energy of 70 MeV. Gamma-ray coincidences were measured with the Chateau de Cristal spectrometer array. Two rotational bands with rather regular energy spacings have been found. The data are interpreted in terms of collective bands built on proton particle-hole excitations coupled to i 13/2 neutrons at oblate deformation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01291831

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8

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High spin states of189Au (1992)

Bourgeois, C. ; Korichi, A. ; Perrin, N. ; [et al.]

Springer

The European physical journal 343 (1992), S. 243-244

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ISSN: 1434-601X

Keywords: 21.10.Re ; 23.20.Lv ; 27.70+q

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract High-spin states of 189 Au have been investigated through the 174 Yb(19 F, 4n) reaction using in-beam gamma-ray spectroscopy techniques with the “Château de Cristal“ multidetector array. An extended level scheme is proposed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01291830

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9

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Competition between few nucleon emission andγ-ray deexcitation for the reaction systems65Cu+87Rb and40Ar+110Pd (1985)

Cabot, C. ; Gauvin, H. ; Sergolle, H. ; [et al.]

Springer

The European physical journal 322 (1985), S. 393-414

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ISSN: 1434-601X

Keywords: 24.60. Dr ; 25.70. Gh ; 25.70. Jj

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Bothγ-ray and neutron emission have been studied for the reaction systems65Cu(237MeV) +87Rb→152Dy* and40Ar(158MeV)+110Pd→150Gd*. By using a sum spectrometer in coincidence with neutron counters, Ge(Li) or Nal detectors, we have measured the totalγ-ray energy and the average totalγ-multiplicity distributions as well as the neutron spectra for various exit channels. These measurements provide strong evidence for thermal equilibrium in reactions involving a small number of emitted neutrons (i.e.87Rb(65Cu,n or 2n)) at rather high excitation energy (∼54MeV). This statistical emission of only a few neutrons is controlled by very strong y-ray competition: theγ-entry line is found not to be parallel to the yrast line. Instead the energy gap is about 8MeV for J∼27ħ and rises to at least 13MeV for J∼36ħ. There are some indications that the main part of the energy from this gap is removed by statisticalγ-ray cascades. The main features of the experimental data for both entrance channels are well reproduced by statistical model calculations with proper attention to the yrast line position and an adjustement of the dipoleγ-ray normalization coefficient. It is conceivable that the y-ray enhancement that we introduce may be related to a lack of knowledge of the absolute level densities at high energy and spin, or possibly to the presence of new or additional degrees of freedom that may enter into the competition between neutron andγ-ray emission.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01412074

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