A series of photon scattering experiments has been performed on the double-beta decay partners 76Ge and 76Se, in order to investigate their dipole response up to the neutron separation threshold. Gamma-ray beams from bremsstrahlung at the S-DALINAC and from Compton-backscattering at HIGS have been used to measure absolute cross sections and parities of dipole excited states, respectively. The HIGS data allows for indirect measurement of averaged branching ratios, which leads to significant corrections in the observed excitation cross sections. Results are compared to statistical calculations, to test photon strength functions and the Axel-Brink hypothesis
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The authors acknowledge support through U.S. DOE grant Nos. DE-FG02-91ER-40609, DE-FG02-97ER41042, and DE-FG02-97ER41033, the German BMBF grant SFB634, the U.S. National Science Foundation grant No. PHY- 1305801, the UK STFC grant Nos. ST/J500768/1, EPJ Web of Conferences 01031-p.4 ST/J00051/1, and ST/I005528/1, and the Helmholtz Alliance Program grant No. HA216/EMMI.
This article was a part of a conference, CGS15-Capture Gamma-Ray Spectroscopy and Related Topics in Dresden, Germany, August 25-29, 2014. For more proceedings from this conference, please visit: http://www.epj-conferences.org/articles/epjconf/abs/2015/12/contents/contents.html
Werner, V.; Cooper, N.; Goddard, P. M.; Humby, P.; Ilieva, R. S.; Rusev, G.; Beller, J.; Bernards, C.; Crider, B. P.; Isaak, J.; Kelley, J. H.; Kwan, E.; Löher, B.; Peters, E. E.; Pietralla, N.; Romig, C.; Savran, D.; Scheck, M.; Tonchev, A. P.; Tornow, W.; Yates, Steven W.; and Zweidinger, M., "Dipole Strength Distributions from HIGS Experiments" (2015). Chemistry Faculty Publications. 51.