Discovery of low-lying E1 and M1 strengths in Th232


Journal Article

Properties of low-energy dipole states in Th232 have been investigated with the nuclear resonance fluorescence technique. The present work used monoenergetic γ-ray beams at energies of 2-4 MeV from the high-intensity γ-ray source at Triangle Universities Nuclear Laboratory. Over 40 transitions corresponding to deexcitation to the ground state and first excited state were observed for the first time. Excitation energies, integrated cross sections, decay widths, branching ratios, and transition strengths for those states in Th232 were determined and compared with quasiparticle random-phase-approximation calculations. A large number of E1 transitions were observed for the first time in actinide nuclei with summed strength of 3.28(69)×10-3 e2fm2. The observed summed M1 strength of 4.26(63)μN2 is in good agreement with the other actinides and with the systematics of the scissors mode in deformed rare-earth nuclei. © 2011 American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Adekola, AS; Angell, CT; Hammond, SL; Hill, A; Howell, CR; Karwowski, HJ; Kelley, JH; Kwan, E

Published Date

  • March 25, 2011

Published In

Volume / Issue

  • 83 / 3

Electronic International Standard Serial Number (EISSN)

  • 1089-490X

International Standard Serial Number (ISSN)

  • 0556-2813

Digital Object Identifier (DOI)

  • 10.1103/PhysRevC.83.034615

Citation Source

  • Scopus