Jacob Beller, Christina Stumpf, Marcus Scheck, Norbert Pietralla, Daniela Deleanu, Dan M. Filipescu, Tudor Glodariu, Wick C. Haxton, Andrea Idini, John H. Kelley, Elaine Kwan, Gabriel Martínez Pinedo, Rajarshi Raut, Christopher Romig, Robert Roth, Gencho Rusev, Deniz Savran, Anton P. Tonchev, Werner Tornow, Jan Wagner, Henry R. Weller, Nicolae-Victor Zamfir, Markus Zweidinger
- The ( J, T ) = (1, 1) parity doublet in 20Ne 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 E = E(1−) − E(1+) = −3.2(±0.7)stat( +0.6 −1.2)sys keV and the ratio of their integrated cross sections I (+) s,0 /I (−) s,0 = 29(±3)stat( +14 −7 )sys. Shell-model calculations predict a parityviolating 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 20Ne an excellent candidate to study parity violation in nuclear excitations.
