Eur. Phys. J. A (2020) 56: 105
https://doi.org/10.1140/epja/s10050-020-00118-8

Regular Article – Experimental Physics

Firm spin and parity assignments for high-lying, low-spin levels in stable Si isotopes

¹ School of Computing, Engineering, and Physical Sciences, University of the West of Scotland, Paisley, PA1 2BE, UK
² SUPA, Scottish Universities Physics Alliance, Edinburgh, UK
³ Department of Physics, Duke University, Durham, NC, 27708-0308, USA
⁴ Triangle Universities Nuclear Laboratory, Durham, NC, 27708-0308, USA
⁵ Institut für Kernphysik, Technische Universität Darmstadt, 64289, Darmstadt, Germany
⁶ Department of Physics, University of Strathclyde, Glasgow, G4 0NG, UK
⁷ Institut für Kernphysik, Universität zu Köln, 50937, Cologne, Germany
⁸ Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
⁹ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
¹⁰ Departments of Chemistry and Physics & Astronomy, University of Kentucky, Lexington, KY, 40506-0055, USA
¹¹ Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
¹² NSCL, Michigan State University, East Lansing, MI, 48824, USA
¹³ Department of Physics, Florida State University, Tallahassee, FL, 32306, USA
¹⁴ INFN, Sezione di Milano, 20133, Milan, Italy

^* e-mail: marcus.scheck@uws.ac.uk

Received: 22 November 2019
Accepted: 24 February 2020
Published online: 6 April 2020

Abstract

A natural silicon target was investigated in a Si() photon-scattering experiment with fully linearly-polarised, quasi-monochromatic rays in the entrance channel. The mean photon energies used were 9.33, 9.77, 10.17, 10.55, 10.93, and 11.37 MeV, and the relative energy spread (full width at half maximum) of the incident beam was 3.5–4 %. The observed angular distributions for the ground-state decay allow firm spin and parity assignments for several levels of the stable even-even silicon isotopes.