Electric dipole transitions between 31- octupole-phonon states, one-phonon 21,ms+ mixed-symmetry states of 92Zr, 94Mo, 96Ru, and 142Ce are observed, provide the first evidence for F-vector E1 transitions in nuclei. For effective boson models of the nuclear valence shell, F spin is the analog of isospin in the shell model. The 31 -→ 21,ms+ E1 transitions are stronger than those of the 21+ state. The effective E1 operator in the sdf-interacting boson model-2 is concluded to have F-vector character, in analogy with the well-known isovector character of the E1 operator in microscopic models.
|Number of pages||5|
|Journal||Physical Review C - Nuclear Physics|
|State||Published - Sep 2003|
ASJC Scopus subject areas
- Nuclear and High Energy Physics