Electromagnetic properties in 165Lu

doi:10.1016/0375-9474(88)90009-7

Nuclear Physics A

Volume 489, Issue 3, 28 November 1988, Pages 508-524

https://doi.org/10.1016/0375-9474(88)90009-7 Get rights and content

Abstract

Relative electromagnetic transition rates in ¹⁶⁵Lu₉₄ have been measured to high spin ( $I≤ 632$ ) for the two signature components of a band built on a $π h_{112}$ shell-model state. M1 transitions are observed through two band crossings. A DSAM measurement indicates that full collectivity persists for the $π h_{112}$ configuration up to $I ≤ 532$ and that for higher values of I a loss of collectivity could explain the observed increased values of B(M1, I → I−1)/B(E2, → I−2). The effects of alignment, shape changes and rotationally induced deoccupation of antialigned configurations are discussed. In the measured values of the ratio of transition quadrupole moments Q₁/Q₂ the influence of the $vi_{132}$ alignment is observed for the first time. The data are discussed within the context of triaxial nuclear deformation. Comparisons are made with the nuclei ^161,163Lu.

References (30)

H. Emling et al.
Nucl. Phys.
(1984)
P.J. Nolan, D.W. Gifford and P.J. Twin, Daresbury Ann. Report 1984/85 (Nuclear Structure Appendix) p....S. Jönsson et al.
Nucl. Phys.
(1984)
J.C. Bacelar, Nucl. Instr. Meth., to be...
L.C. Northcliffe et al.
Nucl. Data Tables
(1970)
J. Lindhard et al.
Dan. Vid. Selsk. Mat. Fys. Medd.
(1963)
K.S. Krane et al.
Nucl. Data Tables
(1973)
K. Honkanen, H.C. Griffin, D.G. Sarantites, V. Abenante, L.A. Adler, C. Baktash, Y.S. Chen, O. Dietzsch, M.L. Halbert,...
F. Dönau et al.
I. Hamamoto
preprint Lund-MPh-88/8
M. Matsuzaki et al.
Prog. Theor. Phys.
(1988)

A. Ikeda

Nucl. Phys.

(1985)

N. Onishi et al.

Nucl. Phys.

(1986)

G.B. Hagemann et al.

Nucl. Phys.

(1984)

I. Hamamoto

Nuclear structure 1985

A.R. Mokhtar et al.

Cited by (40)

Nuclear Structure and Decay Data for A=165 Isobars
2024, Nuclear Data Sheets
Experimental nuclear spectroscopic data are compiled and evaluated for 18 known nuclides of mass 165 (Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt). Detailed information is presented for each reaction and decay experiment. Combining all the available data, recommended values are provided for energies, spins and parities, and half-lives of levels, with energies, branching ratios and multipolarities of γ radiations, and characteristics of β and α radiations in radioactive decays. ¹⁶⁵Dy, ¹⁶⁵Ho, ¹⁶⁵Er, ¹⁶⁵Tm, ¹⁶⁵Yb, ¹⁶⁵Lu and ¹⁶⁵Hf are among the most extensively studied nuclides via decay and high-spin gamma-ray spectroscopy measurements, followed by limited data for ¹⁶⁵Tb, ¹⁶⁵Ta, ¹⁶⁵W, ¹⁶⁵Re, and ¹⁶⁵Os. No excited states have yet been identified in ¹⁶⁵Sm, ¹⁶⁵Gd, and ¹⁶⁵Pt, while for ¹⁶⁵Eu and ¹⁶⁵Ir, information is available for only the g.s. and an isomer, but with no γ rays. This work supersedes earlier evaluation of A=165 nuclides by 2006Ja09.
Study of normal deformed bands in light Lutetium isotopes
2023, Nuclear Physics A
The projected shell model has been employed to study the energy levels and alignment frequencies of the normally deformed bands of light lutetium isotopes. Band head spins and configurations have been reproduced for all the positive parity bands of ^161−165Lu isotopes and negative parity bands of ¹⁶³Lu. The theoretical aligned angular momenta reasonably reproduced the observed backbends and their corresponding rotational frequencies for all the experimentally observed normally deformed bands. Moreover, I = 7/2⁻ state is predicted as band head spin for negative parity yrast bands of ^161,165Lu. The negative parity yrast bands of ^161,165Lu are predicted to have 1π1h_11/2[523]7/2⁻ configuration. Further, the calculated B(E2) values of ¹⁶⁵Lu show reasonable agreement with the available experimental data. The dip predicted in the B(E2) values may be interpreted due to the alignment of a pair of neutrons in the neutron $1 i_{13 / 2}$ orbital of all yrast bands of ^161−165Lu.
Nuclear Data Sheets for A = 165
2006, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 165 (Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Hf,Ta,W,Re,Os,Ir) with Z = 63 to 77 and N = 102 to 88 have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No excited state data are yet available for ¹⁶⁵Eu, ¹⁶⁵Gd and ¹⁶⁵Tb. In ¹⁶⁵Re an isomer is known at about 50 keV; in ¹⁶⁵Os, about 15 gamma rays are known but no level scheme has been proposed; and in ¹⁶⁵Ir, the the ground state has not yet been identified, but an isomeric state at about 180 keV has been established. Fairly rich structures are known for all the other A = 165 nuclides. Triaxial Superdeformed structures are known in ¹⁶⁵Lu (five SD bands). This evaluation supersedes previous full evaluations of A = 165 by 1987Pe01 and 1974Bu29, a midstream evaluation (in update mode) by 1992Pe04 with literature cutoff date of November 1990, and evaluation of ¹⁶⁵Lu nuclide by 1999Si16. Extensive new data have since become available for most of the nuclides of A = 165 and have been included in the current evaluation.
Coexisting normal and triaxial superdeformed structures in 165Lu
2004, Nuclear Physics A
High-spin states in ¹⁶⁵Lu were populated in the ¹³⁹La $(^{30} Si,4n)$ reaction at a beam energy of 152 MeV and γ-ray coincidences were measured with the EUROBALL spectrometer array. Nine new rotational bands were discovered, known band structures were considerably extended and many inter-band transitions were found. Structures with normal deformation coexist with bands associated with the strongly deformed triaxial energy minima found in calculations. Three of these triaxial bands form a family of wobbling excitations with phonon quanta n_w=0, 1 and 2. The wobbling mode is a unique signature of nuclear triaxiality. Configuration assignments are discussed for the observed band structures. An exchange of configuration between two of the new bands due to mixing is observed, resulting in different signature partnerships at low and high spins.
General properties of the πh<inf>9/2</inf>[541]1/2- configuration and level scheme of 165Tm
2001, Nuclear Physics A
¹⁶⁵Tm has been studied through the reactions ¹⁵⁰Nd(¹⁹F, 4n), E_beam=85 MeV and ¹⁵⁴Sm (¹⁵N, 4n), E_beam=70 MeV. The level scheme has been extended to spin 71/2⁻ℏ, and four new bands have been added. Two are assigned to the K=17/2, three-quasiparticle configurations, π[523]7/2⁻⊗ν[642]5/2⁺⊗ν[523]5/2⁻ and π[404]7/2⁺⊗ν[642]5/2⁺⊗ν[523]5/2⁻, and the remaining two are assigned to γ-vibrations coupled to an h_9/2 proton. Lifetimes of high-spin states in the [541]1/2⁻ and [411]1/2⁺ bands have been measured using DSAM techniques, allowing transition quadrupole moments to be deduced. Furthermore, crossings between the [541]1/2⁻ and [523]7/2⁻ bands and between the [411]1/2⁺ and [404]7/2⁺ bands are analysed with a band-mixing calculation to obtain the quadrupole moments of the [523]7/2⁻ and [404]7/2⁺ bands. While the [523]7/2⁻, [411]1/2⁺ and [404]7/2⁺ bands all have similar deformations, the [541]1/2⁻ band has a quadrupole moment approximately 15% larger. The relative deformations are in good agreement with diabatic potential energy surface calculations performed using the code “Ultimate Cranker”. The experimental crossing frequency, due to the alignment of i_13/2 neutrons, is found to be delayed in the [541]1/2⁻ band compared to the other bands. This is a universal feature in the rare-earth region, and extensive systematic Cranked Shell Model calculations have been performed to predict deformations and crossing frequencies for nuclei in the region. The model is unable to reproduce the full delay in crossing frequency, confirming that deformation alone is not responsible for the shift.
Triaxial nuclear shapes in odd-Ta nuclei?
2001, Nuclear Physics A

View all citing articles on Scopus

¹: Permanent address: Schuster Laboratory, Dept. of Physics, University of Manchester.

²: Permanent address: Oak Ridge National Laboratory, Building 6000, Oak Ridge, Tennessee 37831, USA.

View full text

Energy reconstruction of an n-type segmented inverted coaxial point-contact HPGe detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 868, 2017, pp. 19-26
M. Salathe, …, J.P. Wright
The primary–secondary care interface: Does provision of more services in primary care reduce referrals to medical specialists?
Health Policy, Volume 118, Issue 1, 2014, pp. 48-55
Christel E. van Dijk, …, Dinny H. de Bakker
Conceptual design of the AGATA $1 π$ array at GANIL
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 855, 2017, pp. 1-12
E. Clément, …, M. Rudigier
Position resolution simulations for the inverted-coaxial germanium detector, SIGMA
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 892, 2018, pp. 84-92
J.P. Wright, …, C. Unsworth
First experimental measurements with the Segmented Inverted-coaxial GerMAnium (SIGMA) detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 1027, 2022, Article 166044
F.J. Pearce, …, J.P. Wright
Characterization of a gamma-ray tracking array: A comparison of GRETINA and Gammasphere using a ⁶⁰Co source
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 836, 2016, pp. 46-56
T. Lauritsen, …, O. Stezowski

Article preview

Nuclear Physics A

Abstract

References (30)

Nucl. Phys.

Nucl. Phys.

Nucl. Data Tables

Dan. Vid. Selsk. Mat. Fys. Medd.

Nucl. Data Tables

preprint Lund-MPh-88/8

Prog. Theor. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nuclear structure 1985

Cited by (40)

Nuclear Structure and Decay Data for A=165 Isobars

Study of normal deformed bands in light Lutetium isotopes

Nuclear Data Sheets for A = 165

Coexisting normal and triaxial superdeformed structures in <sup>165</sup>Lu

General properties of the πh<inf>9/2</inf>[541]1/2<sup>-</sup> configuration and level scheme of <sup>165</sup>Tm

Triaxial nuclear shapes in odd-Ta nuclei?