High-spin states and lifetime measurements in 171Hf

doi:10.1016/S0375-9474(00)00061-0

Nuclear Physics A

Volume 673, Issues 1–4, 19 June 2000, Pages 3-30

https://doi.org/10.1016/S0375-9474(00)00061-0 Get rights and content

Abstract

This paper describes the results of two complementary experiments which studied the properties of the well-deformed nucleus $^{171}$ Hf. The first experiment, with a thin self-supporting target, extended the rotational bands built upon the [633]7 $/$ 2, [512]5 $/$ 2 and [521]1 $/$ 2 configurations up to spins of 73 $/$ 2–85 $/2ℏ$ . The configurations of these bands and observed band crossings are discussed within the framework of the cranked-shell model. The second experiment employed a backed target in order to measure the lifetimes, by the Doppler Shift Attenuation method, and thereby establish deformations for some of the states in the collective rotational bands. The extracted deformations are found to be consistent with those predicted from theoretical Total Routhian Surface calculations. These deformations provide strong evidence that the high-spin states in $^{171}$ Hf, and perhaps more importantly, in the region where the high- $K$ ( $K^{π} =19/2^{+}$ and $K^{π} =23/2^{−}$ ) isomeric states decay, retain their well-deformed axial symmetry.

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Experimental data pertaining to all nuclei with mass number A=171 (Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg) 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. This evaluation for A=171, which considers data received by 30 June 2018, supersedes the 2002 evaluation (with a literature cutoff date of August 2002) by Coral M. Baglin, published in Nuclear Data Sheets 96, 399 (2002) and the subsequent evaluation of the ENSDF file for 171Pt by C. Baglin (literature cutoff date of 15 April 2010).
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¹: Present address: Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S4M1, Canada.

²: Present address: Department of Physics, University of York, Heslington, York, YO1 5DD, U.K.

³: Present address: Institut für Kernphysik, Universität zu Köln, Zülpicher Str. 77, D-50937, Köln, Germany.

⁴: Present address: National Accelerator Center, PO Box 72, Faure, ZA-7131 South Africa.

⁵: Present address: C.E.A. Saclay, DAPNIA/SPhN, F-91191 Gif/Yvette, France.

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High-spin states and lifetime measurements in 171Hf

Abstract

Nucl. Phys. A

Nucl. Phys. A

Phys. Lett. B

Nucl. Phys. A

Nucl. Instrum. Methods

Nucl. Data Tables

Nucl. Phys. A

Nucl. Data Tables

At. Data. Nucl. Data Tables

Nucl. Instrum. and Meth.

Comput. Phys. Commun.

Nucl. Phys. A

Nucl. Phys. A

Nucl. Phys. A

Nucl. Phys. A

Phys. Lett. B

Phys. Rev. Lett.

High-spin states and lifetime measurements in $^{171}$ Hf