GRID and Multiphonon States.

J Res Natl Inst Stand Technol

Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38505.

Published: August 2016

The development of the GRID technique for determining nuclear level lifetimes of excited low-spin states populated in thermal neutron capture reactions has resulted in the ability to perform detailed studies of proposed multiphonon excitations for the first time. This paper discusses the experimental evidence for multiphonon excitations determined using the GRID technique. In deformed nuclei several good examples of γγK(π) = 4(+) excitations have been established, whereas the experimental evidence gathered on K(π)= 0(+) bands is contradictory, and any interpretations will likely involve the mixing of several different configurations. In vibrational nuclei the GRID technique has helped to establish the existence of multiple quadrupole phonon excitations in (114)Cd, and an almost complete set of quadrupole-octupole coupled states in (144)Nd.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4878356PMC
http://dx.doi.org/10.6028/jres.105.014DOI Listing

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