Bernabei, R (reprint author), Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy.
A new investigation of Pp decay modes in Xe-134 and in Xe-136 is presented. The data have been collected deep underground at the Gran Sasso National Laboratory of the INFN over a period of 8823.54 hours with the similar or equal to 6.5 kg DAMA liquid xenon pure scintillator, filled by Kr-free xenon containing 17.1 % of Xe-134 and 68.8% of Xe-136. New limits are set for various decay modes. (C) 2002 Elsevier Science B.V. All rights reserved.