Evidence for radiative coupling of the pygmy dipole resonance to excited states

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

The photoabsorption cross section and ground state branching ratio of $^{142}$ Nd were measured using quasi-monoenergetic -ray beams at several beam energies. Two peaks corresponding to the isovector pygmy dipole resonance (PDR) were identified. The branching ratios were compared to statistical-model calculations. We found that the Brink hypothesis is violated, and that the branching ratios are only reproduced by assuming that the observed isovector PDR selectively decays to the isoscalar PDR.

Language	:	English
Journal	:	Physical Review C
Volume	:	86
Number	:	5
Pages	:	p.051302_1 - 051302_5
Publication Year/Month	:	2012/11
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Paper URL	:	https://doi.org/10.1103/PhysRevC.86.051302
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Keywords	:	no keyword
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Registration No. : AA20120064
JAEA Abstracts No. : 41000330
Paper Submission No. : 11962

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