Beller, J; Stumpf, C; Scheck, M; Pietralla, N; Deleanu, D; Filipescu, DM; Glodariu, T; Haxton, W; Idini, A; Kelley, JH; Kwan, E; Martinez-Pinedo, G; Raut, R; Romig, C; Roth, R; Rusev, G; Savran, D; Tonchev, AP; Tornow, W; Wagner, J; Weller, HR; Zamfir, NV; Zweidinger, M, *Separation of the 1*^{+}/1^{-}parity doublet in^{20}Ne,
Physics Letters B, vol. 741
(February, 2015),
pp. 128-133 [doi] .
**Abstract:**

*© 2014 The Authors. The (J, T)=(1, 1) parity doublet in 20 Ne at 11.26 MeV is a good candidate to study parity violation in nuclei. However, its energy splitting is known with insufficient accuracy for quantitative estimates of parity violating effects. To improve on this unsatisfactory situation, nuclear resonance fluorescence experiments using linearly and circularly polarized γ-ray beams were used to determine the energy difference of the parity doublet δE=E(1 - )-E(1 + )=-3.2(±0.7)stat( -1.2 +0.6 )sys keV and the ratio of their integrated cross sections I s,0 (+) /Is,0(-)=29(±3) stat ( -7 +14 ) sys . Shell-model calculations predict a parity-violating matrix element having a value in the range 0.46-0.83 eV for the parity doublet. The small energy difference of the parity doublet makes 20 Ne an excellent candidate to study parity violation in nuclear excitations.*