Physics Letters B (Feb 2015)
Separation of the 1+/1− parity doublet in 20Ne
- J. Beller,
- C. Stumpf,
- M. Scheck,
- N. Pietralla,
- D. Deleanu,
- D.M. Filipescu,
- T. Glodariu,
- W. Haxton,
- A. Idini,
- J.H. Kelley,
- E. Kwan,
- G. Martinez-Pinedo,
- R. Raut,
- C. Romig,
- R. Roth,
- G. Rusev,
- D. Savran,
- A.P. Tonchev,
- W. Tornow,
- J. Wagner,
- H.R. Weller,
- N.-V. Zamfir,
- M. Zweidinger
Affiliations
- J. Beller
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- C. Stumpf
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- M. Scheck
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany; School of Engineering, University of the West of Scotland, Paisley PA1 2BE, UK; SUPA, Scottish Universities Physics Alliance, Glasgow G12 8QQ, UK
- N. Pietralla
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany; Corresponding author.
- D. Deleanu
- Horia Hulubei National Institute of Physics and Nuclear Engineering, ELI-NP, Bucharest-Magurele, Romania
- D.M. Filipescu
- Horia Hulubei National Institute of Physics and Nuclear Engineering, ELI-NP, Bucharest-Magurele, Romania
- T. Glodariu
- Horia Hulubei National Institute of Physics and Nuclear Engineering, ELI-NP, Bucharest-Magurele, Romania
- W. Haxton
- University of California, Berkeley, CA, USA
- A. Idini
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- J.H. Kelley
- Triangle Universities Nuclear Laboratory, North Carolina State University, Raleigh, NC, USA
- E. Kwan
- Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA
- G. Martinez-Pinedo
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
- R. Raut
- Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA
- C. Romig
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- R. Roth
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- G. Rusev
- Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA
- D. Savran
- ExtreMe Matter Institue EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany; Frankfurt Institute for Advanced Studies FIAS, D-60438 Frankfurt am Main, Germany
- A.P. Tonchev
- Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA
- W. Tornow
- Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA
- J. Wagner
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- H.R. Weller
- Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA
- N.-V. Zamfir
- Horia Hulubei National Institute of Physics and Nuclear Engineering, ELI-NP, Bucharest-Magurele, Romania
- M. Zweidinger
- Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
- Journal volume & issue
-
Vol. 741
pp. 128 – 133
Abstract
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 ΔE=E(1−)−E(1+)=−3.2(±0.7)stat(−1.2+0.6)sys keV and the ratio of their integrated cross sections Is,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 20Ne an excellent candidate to study parity violation in nuclear excitations. Keywords: Parity doublet, Parity violation
