137Ba Double Gamma Decay Measurement with GAMMASPHEREE. Merchán, K. Moran, C.J. Lister, P. Chowdhury, E.A. McCutchan, J.P. Greene, S. Zhu, T. Lauritsen, M.P. Carpenter and R. ShearmanEPJ Web of Conferences, 93 (2015) 01033DOI: https://doi.org/10.1051/epjconf/20159301033