First observation of medium-spin excitations in the 138Cs nucleus T. Rzaca-Urban, W. Urban, M. Saha Sarkar, S. Sarkar, J. L. Durell, A. G. Smith, B. J. Varley and I. Ahmad Eur. Phys. J. A, 32 1 (2007) 5-9 Published online: 27 April 2007 DOI: 10.1140/epja/i2007-10362-1