1988
DOI: 10.1103/physrevc.38.2674
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Shape coexistence inTl189

Abstract: High spin states of '"Tl have been populated through the fusion-evaporation reactions Tm[ Mg(125 MeV), 4n], ' 'Ho[ Si(140 MeV), 4n], and " Lu[ Ne(128 MeV), 6n] and its subsequent decay studied by in-beam y-ray spectroscopy techniques. Among the firmly established features there are two band structures resulting from the coupling of the h~and i '2 proton intruder states to the oblate ground-state band of the Hg core. However, above a certain excitation energy both bands show structural changes possibly related … Show more

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Cited by 14 publications
(19 citation statements)
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“…1). In the following only the particular points contributed by the present data as compared to the previous set [5] will be discussed. Besides the two strongly coupled bands {i. e. , b,I = 1 sequences) already seen in the heavier odd-mass Tl isotopes, we confirm the existence of a decoupled XI=2 sequence (built on the 1714-keV level).…”
Section: Experimental Methods and Resultsmentioning
confidence: 99%
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“…1). In the following only the particular points contributed by the present data as compared to the previous set [5] will be discussed. Besides the two strongly coupled bands {i. e. , b,I = 1 sequences) already seen in the heavier odd-mass Tl isotopes, we confirm the existence of a decoupled XI=2 sequence (built on the 1714-keV level).…”
Section: Experimental Methods and Resultsmentioning
confidence: 99%
“…More recently, this behavior has, in addition, been found in odd-Z nuclei such as ' Tl [5] and Au [6]. In both cases prolate bands involving the mi -", intruder orbital have been observed, while the band due to the~h -, 'excitation has only been reported in ' Au.…”
Section: Introductionmentioning
confidence: 83%
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“…For oblate deformation in Tl nuclei with Z = 81 [34][35][36], the proton Nilsson orbitals originating from πh 9/2 spherical parentage are intruding from the above Z = 82 shell closure, and the Nilsson state with the largest projection on the nuclear symmetry axis ( p = 9/2) lies nearest to the proton Feimi surface, giving rise to strongly coupled bands in the odd-A Tl nuclei. On the other hand, for the odd-A Hg isotopes ranging from A = 189 to 199 [31][32][33], the neutron Fermi surface is near the top of the νi 13/2 subshell, and since the deformation is oblate the neutron angular momentum is approximately in a plane perpendicular to the symmetry axis, resulting in decoupled νi 13 Alignments are extracted to be about 2.0h and 6.0h athω = 0.20 MeV for the πh 9/2 band in 189 Tl and the νi 13/2 band in 189 Hg, respectively.…”
Section: Configuration Assignmentmentioning
confidence: 99%
“…These Hg isotopes represent excellent cases where the cranked shell model (CSM) was successfully applied to oblate systems (γ = −60 • ) rotating around an axis perpendicular to the symmetry axis [32,33]. In order to study the influence of rotation on the shape of the 190 Tl nucleus, and to compare the band properties between 190 Tl and its odd-A neighbors [32,[34][35][36], it is necessary to transform the experimental excitation energies and spins into the rotating frame. The experimental Routhians and alignments have been extracted according to Ref.…”
Section: A Band Properties In the Rotating Framementioning
confidence: 99%