Intrinsic and rotational levels in 167Lu
Abstract
The γ-rays emitted when targets of 169Tm are bombarded by 3He and α-particles, and 171Yb targets by protons, have been studied with Ge(Li) detectors and interpreted within the level scheme of 167Lu. The rotational bands built on the and tentatively states are identified up to high spin values.
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Nuclear Structure and Decay Data for A=167 Isobars
2023, Nuclear Data SheetsExperimental nuclear spectroscopic data are compiled and evaluated for 17 known nuclides of mass 167 (Sm, Eu, Gd, Tb, Dy, Ho, Er Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt), 23 years after the previous full evaluation by 2000Ba65. 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. The α decays of A=171 nuclei to A=167 daughters are included in this work, while for α decays of A=167 nuclei to A=163 daughters, consult Nuclear Data Sheets (2010Re03) or the ENSDF database for A=163. 167Er, 167Tm, 167Yb, 167Lu and 167Ta are among the most extensively studied nuclides via decay and high-spin gamma-ray spectroscopy measurements, followed by 167Ho, 167Hf, 167W, and 167Os. Information for excited states in 167Dy, 167Re, and 167Ir are limited; no excited states have yet been identified in 167Sm, 167Eu, 167Gd, 167Tb and 167Pt, with the ground-state half-life of 167Sm remaining unknown. This work supersedes the earlier evaluation of A=167 nuclei by 2000Ba65.
Nuclear Data Sheets for A = 169
2008, Nuclear Data SheetsExperimental data pertaining to all nuclei with mass number A = 169 (Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt) have been evaluated. Level schemes from both radioactive decay and reaction studies are presented, along with associated tables of experimental data and adopted properties for levels and γ rays. These include data from several recent high-precision measurements of intensities for γ rays emitted in 169Yb ε decay; these are of special interest because of their use as calibration standards. Excited-state information is newly available for Re, Os, Ir and Pt, and heavy-ion reaction studies have significantly expanded our knowledge of excited states in Lu through Ta. More extensive work on ε decay from W is needed and new experimental work will be required to resolve a discrepancy between the Jπ values deduced for a 180-keV level in 169Ta based on extensive band structure from (HI,xnγ) work (Jπ = 1/2–) and TDPAD measurements (J = 5/2). The present evaluation for A = 169, which considers data received by 15 June 2008, supersedes the 1991 evaluation (with a literature cutoff date of March 1990) by V. Shirley, published in Nuclear Data Sheets 64, 505 (1991).
Shapes, electromagnetic properties and enhanced E1 strength in <sup>169</sup>Lu
1993, Nuclear Physics, Section ARotational bands in 169Lu previously observed via (p, 3n) and (α, 4n) reactions were extended by 8–14 units of angular momentum using the 154Sm(19F, 4n) reaction and the Nordball detector array. By analysis of γγ coincidence relations and γ-ray angular correlations we have established the , band to , the bands to > the [404]+ bands to and the [411], to . The bands belonging to the and configurations with appear to be rather mixed in the low spin region. One of these bands is established to units of spin. The transitions interconnecting the signature partners, in the bands based on the and [404] Nilsson orbitais, as well as in and between the strongly mixed and bands are compared to particle-rotor model calculations. By DSAM analysis, lifetimes and thereby transition quadrupole moments for the band built on the configuration , could be extracted. The abnormal alignment pattern at the crossing for the ban analysed in terms of a difference in both deformation and neutron pairing compared to the other less polarizing configurations. The influence of octupole modes on the strength of observed transitions as well as on observed spin-flip, , E1 transitions is investigated theoretically and compared to the experimental data.
Transition quadrupole moments of high-spin states in <sup>172</sup>W and their implications for the interpretation of band crossings in the light isotopes of W to Pt
1991, Nuclear Physics, Section ALifetimes of states in 172W have been measured by the Doppler-shift recoil-distance method using the reaction 124Sn(52Cr, 4n)172W at a bombarding energy of 225 MeV. The data were collected in the γγ-coincidence mode rather than the customary singles mode in order to reduce the complexities of the γ-ray spectra and to avoid some of the problems associated with side feeding to excited states. At low spin the experimental transition quadrupole moments, Qt, are all near a constant value of 7.0 e·b. For states in the yrast band with , the experimental Qt values are all near a constant value of 6.8 e.b. This is the trend predicted by cranked Hartree-Fock-Bogoliubov (HFB) calculations and by the calculated systematics of triaxial shape-driving forces which originate from the aligned neutron orbitals around N = 98. From the extensive total routhian surface (TRS) calculations in this mass region, it now seems clear that the low lying band crossings in the light W to Pt isotopes are due to the alignment of various neutron
Nuclear data sheets for A = 169
1991, Nuclear Data SheetsExperimental data pertaining to all nuclei with mass A=169 have been evaluated. Level schemes from both radioactive decay and reaction studies are presented, along with associated tables of experimental data and adopted properties for levels and γ rays. The energies and intensities of γ rays emitted by 169Yb are of special interest because of their use as calibration standards. The new values presented here incorporate recent data on several important transitions. This evaluation of A=169, covering data received by March 1990, supersedes the 1982 compilation of V. S. Shirley (82Sh35), published in Nuclear Data Sheets 36, 443 (1982).
High-spin spectroscopic study of <sup>167</sup>Lu
1990, Nuclear Physics, Section AThree decay sequences associated with the Nilsson states of 167Lu have been established to high spin using the 123Sb(48Ca,4n)167Lu reaction. The quasineutron and quasiproton band crossings, the energy signature splittings, and the B(M1)/B(E2) values are discussed and compared with similar quantities for the lighter lutetium isotopes. Configuration-and isotopic-dependent deformations, reflected in such comparisons, indicate that 167Lu has a larger and more stable prolate deformation than the lighter isotopes and that the configuration has a larger quadrupole deformation than the configuration. The shift of the AB neutron band crossing occurring in the sequences to a larger rotational frequency cannot be understood in terms only of deformation differences. The configuration and neutron-number dependent shapes are also discussed in a “gauge”-space analysis.