Low-spin excitations in Zr97

T. Rząca-Urban, W. Urban, M. Czerwiński, J. Wiśniewski, A. Blanc, H. Faust, M. Jentschel, P. Mutti, U. Köster, T. Soldner, G. de France, G. S. Simpson, and C. A. Ur
Phys. Rev. C 98, 064315 – Published 13 December 2018

Abstract

The main goal of this work is the determination of spins and parities of excited states in Zr97, among others the 2264.3-keV level, which had previously been tentatively reported as the 11/2 excitation corresponding to the h11/2 neutron orbital. Low-spin excited states in Zr97 were populated via the cold-neutron capture reaction. The γ rays emitted following the reaction were measured using the highly efficient array of high-purity germanium detectors, EXILL, at the Institut-Laue-Langevin (ILL), Grenoble. The primary γ rays deexciting the capture state in Zr97 were identified for the first time. The new, precise neutron binding energy in Zr97 of 5569.15(4) keV differs significantly from the value reported in the literature. The previously reported level scheme has been amended by several new low-spin levels. The (n,γ) data were complemented by a measurement of the β decay of Y97 at the Lohengrin fission-fragment separator of the ILL, and the observation of the β decay of Y97 populated in neutron-induced fission of U235 and measured using the EXILL Ge array. The combined data allowed unique spin-parity assignments for many levels in Zr97. The 2264.3-keV level, with a new spin-parity assignment of 9/2+, may correspond to the νg9/2 extruder orbital.

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  • Received 30 September 2018

DOI:https://doi.org/10.1103/PhysRevC.98.064315

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

T. Rząca-Urban, W. Urban, M. Czerwiński, and J. Wiśniewski

  • Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093 Warszawa, Poland

A. Blanc, H. Faust, M. Jentschel, P. Mutti, U. Köster, and T. Soldner

  • Institut Laue-Langevin, F-38042 Grenoble, France

G. de France

  • Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France

G. S. Simpson

  • LPSC, Université Grenoble Alpes, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France

C. A. Ur

  • Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/IFIN-HH, 077125 Bucharest-Magurele, Romania

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Issue

Vol. 98, Iss. 6 — December 2018

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