EPJ Web of Conferences (Jan 2016)

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

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

DOI
https://doi.org/10.1051/epjconf/201612212003
Journal volume & issue
Vol. 122
p. 12003

Abstract

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The 90Zr nucleus was produced by three different reactions: 90Zr(p,p’), 91Zr(p,d), and 92Zr(p,t), and the spin-parity (Jπ) 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 Jπ 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.