First observation of excited states in the neutron deficient <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>N</mi><mo>=</mo><mn>86</mn><mn></mn></math> isotones <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>159</mn></mrow></msup></mrow><mi mathvariant="normal">Ta</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>160</mn></mrow></msup></mrow><mi mathvariant="normal">W</mi></math>

A. Keenan; R. D. Page; J. Simpson; N. Amzal; J. F. C. Cocks; D. M. Cullen; P. T. Greenlees; S. L. King; K. Helariutta; P. Jones; D. T. Joss; R. Julin; S. Juutinen; H. Kankaanpää; P. Kuusiniemi; M. Leino; M. Muikku; A. Savelius; M. B. Smith; M. J. Taylor

doi:10.1103/PhysRevC.63.064309

First observation of excited states in the neutron deficient $N = 86$ isotones $^{159} Ta$ and $^{160} W$

A. Keenan, R. D. Page, J. Simpson, N. Amzal, J. F. C. Cocks, D. M. Cullen, P. T. Greenlees, S. L. King, K. Helariutta, P. Jones, D. T. Joss, R. Julin, S. Juutinen, H. Kankaanpää, P. Kuusiniemi, M. Leino, M. Muikku, A. Savelius, M. B. Smith, and M. J. Taylor

Phys. Rev. C 63, 064309 – Published 8 May 2001

Abstract

The $γ$ decays of excited states in the neutron deficient nuclei $^{159} Ta$ and $^{160} W$ have been identified for the first time. The nuclei of interest were produced in reactions induced by beams of $^{58} Ni$ ions at energies of 286 MeV, 291 MeV, and 298 MeV bombarding a $^{106} Cd$ target. Prompt $γ$ rays were recorded using the JUROSPHERE spectrometer and were tagged through the subsequent $α$ decays of associated recoil ions measured in a position-sensitive silicon strip detector at the focal plane of the gas-filled separator RITU. Level schemes have been deduced and compared with similar structures observed in neighboring nuclei.

Received 13 February 2001

DOI:https://doi.org/10.1103/PhysRevC.63.064309

Authors & Affiliations

A. Keenan^1,*, R. D. Page^1,†, J. Simpson², N. Amzal¹, J. F. C. Cocks³, D. M. Cullen^1,‡, P. T. Greenlees^1,*, S. L. King¹, K. Helariutta^3,§, P. Jones³, D. T. Joss⁴, R. Julin³, S. Juutinen³, H. Kankaanpää³, P. Kuusiniemi³, M. Leino³, M. Muikku^3,∥, A. Savelius³, M. B. Smith^5,¶, and M. J. Taylor¹

¹Oliver Lodge Laboratory, University of Liverpool, Liverpool L63 7ZE, United Kingdom
²CLRC, Daresbury Laboratory, Warrington WA4 4AD, United Kingdom
³Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland
⁴Division of Natural Sciences, Staffordshire University, Stoke-on-Trent ST4 2DE, United Kingdom
⁵Department of Physics, University of Paisley, Paisley PA1 2BE, United Kingdom

^*Present address: Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland.
^†Corresponding author. Electronic address: rdp@ns.ph.liv.ac.uk
^‡Present address: Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.
^§Present address: Gesellschaft für Schwerionenforschung, D-6100 Darmstadt, Germany.
^∥Present address: CLRC, Daresbury Laboratory, Warrington WA4 4AD, United Kingdom
^¶Present address: Department of Physics and Astronomy, Rutgers University, New Brunswick, NJ 08903.

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Vol. 63, Iss. 6 — June 2001

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