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Microsecond isomers in 187Tl and 188Pb (2000)

Byrne, A.P. ; Baxter, A.M. ; Dracoulis, G.D. ; [weitere]

Springer

The European physical journal 7 (2000), S. 41-44

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ISSN: 1434-601X

Schlagwort(e): PACS: 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 ≤ A ≤ 189

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: Lifetime measurements of states in nuclei with A=187 and 188 have been performed, using reactions between 155Gd and 36Ar and following the transport of evaporation residues to the focal plane of a gas-filled recoil separator. In a separate experiment using the 159Tb(32S, 4n) reaction the γ-decay of isomeric levels in 187Tl has been studied using delayed γ-γ coincidence measurements. From observation of their subsequent γ decay, the mean lifetimes were measured to be 1000 ± 55 ns and 1600 ± 100 ns. Although it was not possible to characterize the isomers completely, they are proposed as candidates for one-proton, two-neutron excitations. In the course of this study, the decay of an isomer in 188Pb was also observed and its lifetime was measured as 1150 ± 30 ns, and limits of 20–600 ns were placed on the meanlife of an isomer conjectured in 187Pb.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100500050008

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Digitale Medien

Gamma-ray spectroscopy of 192–195Po (1999)

Helariutta, K. ; Cocks, J.F.C. ; Enqvist, T. ; [weitere]

Springer

The European physical journal 6 (1999), S. 289-302

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ISSN: 1434-601X

Schlagwort(e): PACS: 27.80.+w 190 〈 A 〈 219 – 23.20.Lv Gamma transitions and level energies – 21.60.Ev Collective models – 25.70.-z Low and intermediate energy heavy-ion reactions

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: Prompt and delayed γ-rays have been observed from very neutron deficient 192–195Po nuclei by using the recoil-decay tagging (RDT) and recoil gating techniques. The yrast levels up to the (10+) state in the 192Po were identified for the first time. Comprehensive data for 194Po rendered it possible to extend the yrast line and to observe several positive and negative parity non-yrast states. In the odd-mass isotopes 193Po and 195Po, favoured and unfavoured states on top of the 13/2+ state have been identified. The results are discussed within the simple vibrator and rotor pictures as well as in the framework of coexisting spherical and deformed-intruder structures.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100500050347

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First observation of excited states in 184Pb: spectroscopy beyond the neutron mid-shell (1998)

Cocks, J.F.C. ; Muikku, M. ; Korten, W. ; [weitere]

Springer

The European physical journal 3 (1998), S. 17-20

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ISSN: 1434-601X

Schlagwort(e): PACS:21.60.Ev Collective models – 23.20.-g Electromagnetic transitions – 25.70.gh Compound nucleus – 23.60.+e α decay

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: Excited states have been identified for the first time in 184Pb, the first even-even Pb isotope beyond the 82 〈 N 〈 126 mid-shell, using the recoil-decay tagging (RDT) technique. A collective band built on the first-excited 2+ state has been observed. This resembles those seen in 186,188Pb and the Hg isotones, and can thus be associated with a prolate-deformed shape. Variable moment of inertia (VMI) fits of the prolate 0+ level energies in 184,186,188Pb indicate that the minimum appears at N= 103, the same neutron number at which the corresponding minimum in Hg isotopes is observed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100500050144

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