Precision measurement of the E 2 transition strength to the 21+ state of 12C
Abstract
The form factor of the electromagnetic excitation of 12C to its 21+ state was measured at extremely low momentum transfers in an electron-scattering experiment at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC). A combined analysis with the world form-factor data results in a reduced transition strength B (E 2 ;21+→01+) =7.63 (19 ) e2fm4 with an accuracy improved to 2.5%. In-medium no-core shell-model results with interactions derived from chiral effective field theory are able to reproduce the result. A quadrupole moment Q (21+) =5.97 (30 ) e fm2 can be extracted from the strict correlation with the B (E 2 ) strength emerging in the calculations.
- Publication:
-
Physical Review C
- Pub Date:
- July 2020
- DOI:
- 10.1103/PhysRevC.102.011302
- arXiv:
- arXiv:2005.04072
- Bibcode:
- 2020PhRvC.102a1302D
- Keywords:
-
- Nuclear Experiment;
- Nuclear Theory
- E-Print:
- 6 pages, 6 figures, submitted to Phys. Rev. C