Electromagnetic properties of high-K rotational bands in the odd-odd 160Ho nucleus

doi:10.1016/0375-9474(90)90006-8

Nuclear Physics A

Volume 512, Issue 1, 28 May 1990, Pages 109-123

https://doi.org/10.1016/0375-9474(90)90006-8 Get rights and content

Abstract

The electromagnetic properties of levels up to spin 19ħ in the yrast band and 9ħ in the ground-state band of the odd-odd nucleus ¹⁶⁰Ho have been measured with standard in-beam γ-ray spectroscopy using the ¹⁵⁹Tb(α, 3n) reaction. For the yrast band, the experimental B(M1, I → I − 1)/ B(E2, I → I − 2) ratios increase sharply for rotational frequencies larger than 0.25 MeV, while observed energies do not show any sudden change. This effect suggests a change in the nature of the wave functions. The results are interpreted in terms of the particle-rotor model, cranking shell model and compared to the available data on the neighbouring odd-A nuclei.

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Nuclear Data Sheets for A=160
2021, Nuclear Data Sheets
The experimental results published before May 2021 from the various reaction and decay studies leading to nuclides of Z=59 to Z=75, ¹⁶⁰Pr, ¹⁶⁰Nd, ¹⁶⁰Pm, ¹⁶⁰Sm, ¹⁶⁰Eu, ¹⁶⁰Gd, ¹⁶⁰Tb, ¹⁶⁰Dy, ¹⁶⁰Ho, ¹⁶⁰Er, ¹⁶⁰Tm, ¹⁶⁰Yb, ¹⁶⁰Lu, ¹⁶⁰Hf, ¹⁶⁰Ta, ¹⁶⁰W, ¹⁶⁰Re in the A=160 mass chain have been reviewed. These data are summarized and presented, together with adopted level schemes and properties. This work is intended to supersede the previous evaluation of the A=160 nuclides by C.W.Reich (2005Re18), which was published in Nuclear Data Sheets 105, 557 (2005).
Projected shell model study of band spectra and electromagnetic properties of 160-164Ho
2015, Nuclear Physics A
The structure of observed rotational bands in ^160–164Ho isotopes have been studied by employing projected shell model approach. The theoretical results have been obtained for the band spectra, transition energies and electromagnetic quantities for the experimentally known bands in these isotopes. The theoretical results for band spectra and electromagnetic properties are found to be in reasonably good agreement with most of the observed ones.
Nuclear data sheets for A = 160
2005, Nuclear Data Sheets
The experimental results from the various reaction and decay studies leading to nuclides in the $A = 160$ mass chain have been reviewed. The elements included range from Sm ( $Z = 62$ ) through Re ( $Z = 75$ ). These data are summarized and presented, together with adopted level schemes and properties. This work is intended to supersede the previous evaluation of the $A = 160$ nuclides by this author (1996Re22), which was published in Nuclear Data Sheets 78, 547 (1996).
Quadrupole pairing interaction and signature inversion
2000, Nuclear Physics A
The signature inversion in the πh_11/2⊗νh_11/2 rotational bands of the odd–odd Cs and La isotopes and the πh_11/2⊗νi_13/2 bands of the odd–odd Tb, Ho and Tm nuclei is investigated using pairing and deformation self-consistent mean-field calculations. The model can rather satisfactorily account for the anomalous signature splitting provided that spin assignments in some of the bands are revised. Our calculations show that signature inversion can appear already at axially symmetric shapes. It is found that this is due to the contribution of the (λμ)=(22) component of the quadrupole-pairing interaction to the mean-field potential.
High-spin states in odd-odd 164Lu
1996, Nuclear Physics A
High-spin states in odd-odd ¹⁶⁴Lu have been studied using ¹⁹F and ²³Na induced fusion-evaporation reactions. Three strongly coupled rotational bands have been established and three decoupled bands were tentatively assigned to ¹⁶⁴Lu. The band crossing frequencies, energy sig-nature splittings, and relative transition probabilities were deduced from experimental data and compared with neighboring even-even and odd-A nuclei. An anomalously large band crossing frequency was observed in the excited band, and a pronounced signature inversion was observed in the yrast band of ¹⁶⁴Lu. These anomalies may be associated with residual neutron-proton interactions.
Collective excitations in 160Ho and anomalous signature splitting phenomena in odd-odd nuclei
1996, Nuclear Physics A
Excited states in ¹⁶⁰Ho, populated in the ¹⁵⁴Sm(¹¹B,5nγ) reaction, were investigated using Compton-suppressed Ge detectors. Four rotational bands were observed and their configurations assigned. The electromagnetic properties of the observed bands were studied and compared with model predictions. An increase of the $B(M1) B(E2)$ ratios in the yrast band for frequencies larger than 0.25 MeV is observed. This confirms an effect previously evinced in this and in other odd-odd nuclei of the rare-earth region. A systematic study of the signature inversion in odd-odd nuclei of the rare-earth region is presented. The variation of the inversion frequency for series of isotones and isotopes shows smooth trends.

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^☆: Work supported in part by the Swiss National Science Foundation and by the Paul Scherrer Institute (PSI, formerly SIN).

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A=160

Projected shell model study of band spectra and electromagnetic properties of <sup>160-164</sup>Ho

Nuclear data sheets for A = 160

Quadrupole pairing interaction and signature inversion

High-spin states in odd-odd <sup>164</sup>Lu

Collective excitations in <sup>160</sup>Ho and anomalous signature splitting phenomena in odd-odd nuclei

Electromagnetic properties of high-K rotational bands in the odd-odd 160Ho nucleus☆

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Electromagnetic properties of high-K rotational bands in the odd-odd ¹⁶⁰Ho nucleus☆