Article,
Direct proof of the two-phonon character of the dipole excitations in Nd-142 and Sm-144 around 3.5 MeV
Phys. Rev. C, 54 (2): R449-R453 (August 1996)
DOI: 10.1103/PhysRevC.54.R449
Abstract
Resonant inelastic proton scattering experiments were carried out to
investigate the gamma decay of the 1(-) state at an excitation energy of
around 3.5 MeV in the N = 82 nuclei Nd-142 and Sm-144. gamma-ray
branching ratios were determined from gamma-proton coincidences in both
nuclei. The newly observed gamma decay of the dipole excitation at 3225
keV in `4''Sm to the one-phonon states, in particular the
(1(-)-->3(1)(-)) E2 transition to the octupole phonon state, is the
first direct proof of the two-phonon character of the 1(-) state in any
N = 82 nucleus.
