Rotational bands in odd-odd 174Lu

doi:10.1016/0375-9474(87)90629-4

Nuclear Physics A

Volume 474, Issue 2, 23 November 1987, Pages 518-540

https://doi.org/10.1016/0375-9474(87)90629-4 Get rights and content

Abstract

Levels of ¹⁷⁴Lu, excited by the ¹⁷⁰Er(⁷Li,3nγ) reaction, were studied using standard in-beam γ-ray spectroscopy techniques. Eleven rotational bands were observed, some members were identified up to spin 15 $h ̷$ . An analysis of the experimental results in the framework of the cranking shell model was performed with particular emphasis on the mixed ${p 12^{−} [541]± n 52^{−} [512]}, K^{π} =3^{+} & 2^{+}$ and ${p 72^{+} [404]+ n 72^{+} [633]}, K^{π} =7^{+}$ bands, where one quasiparticle is coupled to the axis of rotation and the other to the axis of deformation. The law of additivity for the particle alignment and for the routhians appears to be valid in these cases.

References (30)

S. Drissi et al.
Nucl. Phys.
(1986)
R.A. O'Neil et al.
Nucl. Phys.
(1972)
A. Gizon et al.
Nucl. Phys.
(1967)
A. Bruder et al.
Nucl. Phys.
(1987)
R. Bengtsson et al.
Nucl. Phys.
(1979)
C. Foin et al.
Nucl. Phys.
(1984)
P. Kemnitz et al.
Nucl. Phys.
(1973)
S. Olbrich et al.
Nucl. Phys.
(1980)
J. Kern et al.
Phys. Lett.
(1984)
R. Bengtsson et al.
At. Data Nucl. Data Tables
(1986)

J.A. Pinston et al.

Nucl. Phys.

(1981)

R. Bengtsson et al.

Nucl. Phys.

(1982)

A.X. Wapstra et al.

Nucl. Phys.

(1985)

K.E.G. Löbner et al.

Nuclear Data Tables

(1970)

R. Bengtsson et al.

Nucl. Phys.

(1984)

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Nuclear data sheets for A = 174
1999, Nuclear Data Sheets
Intrinsic states and rotational bands in 176Ta and 178Ta
1998, Nuclear Physics A
High-spin states in the deformed, doubly odd nuclei, ¹⁷⁶Ta and ¹⁷⁸Ta have been studied by time-correlated γ-ray and electron spectroscopy techniques following (HI,xn) reactions. The new results independently confirm and extend in spin the previously known two- and four-quasiparticle states, albeit with some differences. Many high-seniority structures, most of them with associated rotational bands, have been identified for the first time. Several high-K isomers with half-lives ranging from a few nanoseconds up to hundreds of milliseconds have been discovered. Observation of rotational bands, built upon the intrinsic states has allowed characterization of the configurations, through both the in-band decay properties and alignments. The excitation energies of the observed multi-quasiparticle structures are generally reproduced using calculations based on the Lipkin-Nogami pairing model with inclusion of the effects of blocking and empirical nucleon-nucleon interactions. Some discrepancies in the energies, such as for the 14⁻ and 15⁻ isomers in ¹⁷⁶Ta and ¹⁷⁸Ta, respectively, are attributed to specific configuration mixing. Several anomalously fast K-forbidden transitions are discussed.
First observation of low-energy long-lived isomeric transitions in 166Tm
1996, Nuclear Physics A
A study of ¹⁶⁶Tm by the ¹⁶⁰Gd(¹¹B,5nγ) reaction was performed with the aim for searching for low-energy isomeric transitions using the Recoil Shadow Method (RSM). γ-rays from the production target and from the recoil ions stopped on an annular carbon catcher placed 16 cm downstream were observed with Ge detectors. Singles spectra following bombardment at three different energies, and coincidence spectra, were measured. Six isomeric γ-rays were observed. New levels are established and their configuration assignments are proposed. One of these levels, at (x + 109.3) keV, is isomeric with a half-life of 340(25) ms. An upper limit for x was set to 25 keV. The half-life of the yrast band head was determined to be 2(1) μs. Two alternatives for the decay path of the 340(25) ms level to the ground state are proposed. The structure of the low-lying ${p 72^{+} [404] + n 52^{−} [523]}K^{π} = 6^{−}$ band is established for the first time.
No anomaly of the magnetic moment of 174mLu
1991, Physics Letters B
With nuclear magnetic resonance on oriented nuclei (NMR-ON) the magnetic hyperfine splitting frequency of $^{174m} Lu (I^{π} =6^{−}, T_{12} =142 d)$ in Fe was measured to be 138.5(6) MHz. With the known hyperfine field $B_{HF} (Lu Fe) =−72.81 (36)$ T the magnetic moment of $^{174m} Lu$ is deduced to be 1.497 (10) μ_N, which differs conspicuously from the previous literature value. It is discussed in the context of additivity violation of magnetic g-factors reported previously.
Nuclear data sheets update for A = 174
1991, Nuclear Data Sheets
174Lu nuclear structure revisited
1990, Nuclear Physics, Section A
The data on the ¹⁷⁶Yb(p, 3nγ)¹⁷⁴Lu reaction published by Bruder et al. have been further analyzed, by taking into account newer results from the ¹⁷⁰Er(⁷Li, 3nγ)¹⁷⁴Lu reaction. The $K^{π} = 2^{+} {p 9^{−} 2}[514−n] 5^{−} 2 [512]$ configuration was assigned to a new band having levels with energies close to those of the band proposed by Bruder et al. for which a new assignment is discussed. Three further new bands were disclosed. In addition we present a critical discussion on the measurement of the ^174mLu magnetic moment by Krane et al. Reevaluating their data we get a new value which nearly eliminates an anomaly in the g-factors previously evinced by Kern et al.

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^☆: Work supported in part by the Swiss National Science Foundation and by SIN/Villigen.

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Nuclear Physics A

Abstract

References (30)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

At. Data Nucl. Data Tables

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nuclear Data Tables

Nucl. Phys.

Cited by (20)

Nuclear data sheets for A = 174

Intrinsic states and rotational bands in <sup>176</sup>Ta and <sup>178</sup>Ta

First observation of low-energy long-lived isomeric transitions in <sup>166</sup>Tm

No anomaly of the magnetic moment of <sup>174m</sup>Lu

Nuclear data sheets update for A = 174

<sup>174</sup>Lu nuclear structure revisited

Rotational bands in odd-odd 174Lu☆

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

At. Data Nucl. Data Tables

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nuclear Data Tables

Nucl. Phys.

Rotational bands in odd-odd ¹⁷⁴Lu☆