The collectivity and the de-excitation of the yrast superdeformed band in 150Gd

doi:10.1016/0370-2693(91)91891-X

Physics Letters B

Volume 257, Issues 3–4, 28 March 1991, Pages 269-272

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Abstract

A Doppler shift attenuation measurement has been carried out to determine the collectivity of the superdeformed band in ¹⁵⁰Gd. The data was found to be consistent with a constant inband quadrupole moment of 17 ± 3 eb. This corresponds to a quadrupole deformation of ß₂≈0.58. In addition the measurement has resolved important questions regarding the de-excitation of the band, confirming the rapid de-excitation of the superdeformed band in ¹⁵⁰Gd with more than 80% of the band intensity being lost over one transition.

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The experimental results from the various reaction and decay studies leading to nuclides in the $A = 150$ mass chain have been reviewed. These data are summarized and presented, together with the adopted level schemes and properties, for the nuclides from Cs(Z=55) through Lu(Z=71). This evaluation replaces the previous evaluation by E. der Mateosian and J. K. Tuli (1995De28), which appeared in Nuclear Data Sheets 75, 827 (1995).
From highly to superdeformed shapes: Study of <sup>143</sup>Gd
2000, Nuclear Physics A
A superdeformed band has been discovered in ¹⁴³Gd consisting of 15 transitions. It does not show the band crossing observed in the neighbouring heavier Gd isotopes and it is degenerate with the superdeformed band in ¹⁴³Eu. In contrast to other degenerate bands at superdeformed shape, the configurations of the bands are quite different here. They result from the exchange of a ν6₄ with a π[404]9/2 configuration. In addition, a collective band has been observed which adopts a well-deformed triaxial shape at high spins according to calculations. The transition from highly to superdeformed shapes proceeds via triaxial shapes.
Superdeformed rotational bands in the a ∼ 140-150 mass region: A cranked relativistic mean field description
1996, Nuclear Physics A
The cranked relativistic mean field approach is applied for a systematic investigation of superdeformed rotational bands observed in the A ∼ 140–150 mass region. The present investigation covers yrast and in some cases also excited superdeformed bands of all nuclei of this mass region in which such bands have been observed so far. Using the parameter set NL1, which has been adjusted ten years ago to a few spherical nuclei, reasonable agreement with experimental data is obtained throughout the mass region under investigation. It is shown that the calculated properties of superdeformed rotational bands such as the dependence of the dynamic moment of inertia J⁽²⁾ with respect to the rotational frequency and the absolute value of the charge quadrupole moment Q₀ depends sensitively on the number of occupied high-N intruder orbitals. This is agreement both with previous investigations within the cranked Nilsson-Strutinsky and the cranked Woods-Saxon-Strutinsky approaches and with available experimental data.
Nuclear data sheets for A = 150
1995, Nuclear Data Sheets
Nuclear Data Sheets for A=150 have been revised and updated to March 1995. Summaries of the experimental data, level schemes, adopted level and γ-ray properties and references are given for all known nuclides. For A=150 nuclides from Ba to Lu have been studied. For Ba, La, and Pm only the g.s. has been observed. No information is known for Yb. The relative excitation for the isomers in Tb and Ho which previously was not known has been determined on the basis of their respective mass assignments in 93Au05. High-spin data, together with their band structure are presented for all cases studied. Superdeformed bands have been seen in Gd and Tb. ¹⁵⁰Tb Q(ϵ) value as adopted by 93Au05 is discrepant with its ϵ decay data if the 150 βc T_1/2.
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The spectroscopy of superdeformed bands
1992, Progress in Particle and Nuclear Physics
The spectroscopy of the regions of superdeformed nuclei near A = 150 and A = 190 is discussed. The dependence of the change in $F$ ⁽²⁾ with rotational frequency ω on the proton and neutron intruder configurations [n_p,n_n] is noted as is the effects of configuration on the phenomena of identical or isospectral bands. Spin assignments in the superdeformed Hg isotopes are discussed and attention drawn to an unaccounted for 1 of alignment between isospectral bands. The superdeformed spectroscopy to be studied with the new large γ-ray spectrometer arrays is discussed briefly.

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The collectivity and the de-excitation of the yrast superdeformed band in 150Gd

Abstract

Nucl. Phys. A

Phys. Lett. B

Nucl. Instrum. Methods A

Nucl. Data Tables

At. Data Nucl. Data Tables

Nucl. Phys. A

Phys. Rev. Lett.

Annu. Rev. Nucl. Part. Phys.

The collectivity and the de-excitation of the yrast superdeformed band in ¹⁵⁰Gd