Exploring the spin states of 90Zr populated by (p,p’), (p,d), and (p,t) reactions

S. Ota; J.T. Burke; R.J. Casperson; J.E. Escher; R.O. Hughes; J.J. Ressler; N.D. Scielzo; I.J. Thompson; R.A.E. Austin; B. Abromeit; N.J. Foley; E. McCleskey; M. McCleskey; H. I. Park; A. Saastamoinen; T. J. Ross

doi:10.1051/epjconf/201612212003

Proceedings

Open Access

EPJ Web of Conferences 122, 12003 (2016)
https://doi.org/10.1051/epjconf/201612212003

Exploring the spin states of ⁹⁰Zr populated by (p,p’), (p,d), and (p,t) reactions

S. Ota¹^a, J.T. Burke¹, R.J. Casperson¹, J.E. Escher¹, R.O. Hughes¹, J.J. Ressler¹, N.D. Scielzo¹, I.J. Thompson¹, R.A.E. Austin¹, B. Abromeit³, N.J. Foley³, E. McCleskey³, M. McCleskey³, H. I. Park³, A. Saastamoinen³ and T. J. Ross⁴

¹ Lawrence Livermore National Laboratory, Physics and Life Science Directorate, Livermore, CA 94551, USA
² St. Mary’s College, Halifax, Nova Scotia, Canada
³ Texas A & M University, Cyclotron Institute, College Station, TX 77840 USA
⁴ University of Kentucky, Department of Chemistry, Lexington, KY 40506, USA

^a Corresponding author: ota2@llnl.gov

Published online: 21 June 2016

Abstract

The ⁹⁰Zr nucleus was produced by three different reactions: ⁹⁰Zr(p,p’), ⁹¹Zr(p,d), and ⁹²Zr(p,t), and the spin-parity (J^π) population of the ⁹⁰Zr states produced by these reactions was studied to investigate the surrogate reaction approach, which aims at indirectly determining cross sections for compound-nuclear reactions involving unstable targets such as ⁸⁹Zr(n,γ). Discrete γ-rays, associated with the de-excitation of ⁹⁰Zr and ⁸⁹Zr, were measured in coincidence with light ions at ⁹⁰Zr excitation energies extending above the neutron separation energy. Low-lying states populated by (p,d) and (p,t) reactions agreed well with the previous measurements. The measured γ transition systematics were used to gain insights into the J^π distribution of ⁹⁰Zr around the neutron separation energy and it was found that the (p,p’) reaction preferentially produces lower J states than (p,d) and (p,t) reactions in the studied energy region.

© The Authors, published by EDP Sciences, 2016

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