Violation of the brink hypothesis in Nd

Ndにおけるブリンク仮説の破綻

Angell, C.; Hammond, S. L.*; Karwowski, H. J.*; Kelley, J. H.*; Krtika, M.*; Kwan, E.*; Makinaga, A.*; Rusev, G.*

Angell, C.; Hammond, S. L.*; Karwowski, H. J.*; Kelley, J. H.*; Krtika, M.*; Kwan, E.*; Makinaga, A.*; Rusev, G.*

The photoabsorption cross section and ground state branching ratio of Nd were measured using quasi-monoenergetic -ray beams at several beam energies, using a and a reaction. Two peaks corresponding to the isovectorpygmy dipole resonance (PDR) were identified. The branching ratios were compared to statistical model calculations using the photoabsorption cross section as the radiative strength function. We found that the Brink hypothesis is violated. Extensions to the statistical model to explain the experimental data were attempted, and suggest a new radiative decay mode of the PDR.