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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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Digitale Medien

Fine Structure in the alpha decays of 226U and 230Pu (1999)

Greenlees, P.T. ; Kuusiniemi, P. ; Amzal, N. ; [weitere]

Springer

The European physical journal 6 (1999), S. 269-273

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ISSN: 1434-601X

Schlagwort(e): PACS: 23.60 +e α decay – 27.90 +b 220 〈 A – 25.70 -z Low and intermediate energy heavy-ion reactions

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract: The nuclei 226U and 230Pu have been populated via reactions involving 208Pb targets bombarded by 22Ne and 26Mg projectiles. Fusion-evaporation residues were separated in-flight using a gas-filled recoil separator. A position-sensitive Si-strip detector was employed at the focal plane in order to identify correlated α-decay chains. Two fine structure α-decay lines have been observed. The first, with an energy of 7385(5) keV, is assigned as the α decay from 226U to the first excited 2+ state of 222Th. The second line, observed for the first time in this work, has an energy of 6961(30) keV and is assigned as the α decay from 230Pu to the first excited 2+ state of 226U. The excitation energy of the first excited 2+ state in 226U was determined to be 96(25) keV, giving an estimate of the deformation parameter β2≃ 0.20.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s100500050345

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