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

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

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

A natural silicon target was investigated in a natSi(gamma,gamma' ) photon-scattering experiment using fully polarised, quasi-monochromatic gamma 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, while the relative energy spread (Full Width Half Maximum) of the incident beam amounts to dE / E ~ 3.5 - 4 %. The observed angular distribution in the ground-state decay channel allows to propose a firm spin and parity assignment for several levels of the stable even-even silicon isotopes.

Keywords: Photon scattering; nuclear resonance fluorescence; quasimonoenergetic gamma beam; angular distribution; polarization

  • Open Access Logo European Physical Journal A 56(2020), 105

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