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

J. Sinclair, M. Scheck, S. W. Finch, Krishichayan, U. Friman-Gayer, W. Tornow, G. Battaglia, T. Beck, R. Chapman, M. M.R. Chishti, Ch Fransen, R. Gonzales, E. Hoemann, J. Isaak, R. V.F. Janssens, D. A. Jaroszynski, S. Johnson, M. D. Jones, J. M. Keatings, N. KellyJ. Kleemann, D. Little, B. Löher, K. R. Mashtakov, M. Müscher, D. O’Donnell, O. Papst, E. E. Peters, D. Savran, M. Schilling, R. Schwengner, P. Spagnoletti, M. Spieker, V. Werner, J. Wilhelmy, O. Wieland, S. W. Yates, A. Zilges

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A natural silicon target was investigated in a natSi(γ, γ) photon-scattering experiment with fully linearly-polarised, quasi-monochromatic γ rays in the entrance channel. The mean photon energies used were ⟨ Eγ⟩ = 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 ΔEγ/ ⟨ Eγ⟩ ≈ 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.

Original languageEnglish
Article number105
JournalEuropean Physical Journal A
Issue number4
StatePublished - Apr 1 2020

Bibliographical note

Funding Information:
The authors are indebted to the accelerator crew of HIS, who provided excellent experimental conditions. The UWS group acknowledges financial support by the UK Science and Technology Facilities Council (UK-STFC). The TU Darmstadt members acknowledge financial support by the Deutsche Forschungsgemeinschaft (SFB-1245). In addition, OP and JK acknowledge financial support by the German state of Hesse under the grant Nuclear Photonics within the LOEWE program. The Cologne group acknowledges financial support from the German Bundesministerium für Bildung und Forschung under Grant 05P2018/ELI-NP. This work was supported by the US Department of Energy (DOE), Office of Nuclear Physics, under Grant no. DE-FG02-97ER41033 (Duke University) and DE-FG02-97ER41041 (UNC) and the U.S. National Science Foundation under Grants nos. PHY-1565546 (NSCL) and PHY-1913028. GB and DAJ acknowledge support of the UK EPSRC (Grant no. EP/N028694/1), the EC’s Laserlab-Europe, H2020 EC-GA 654148 and ELI - Extreme Light Infrastructure phase 2 from the European Regional Development Fund.

Publisher Copyright:
© 2020, The Author(s).

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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