PT Journal AU Algora, Aea Jordan, D Tain, JL Rubio, B Agramunt, J Perez-Cerdan, AB Molina, F Caballero, L Nacher, E TI Reactor Decay Heat in Pu-239: Solving the gamma Discrepancy in the 4-3000-s Cooling Period SO Physical Review Letters JI Phys. Rev. Lett. PY 2010 BP 202501 EP 4pp VL 105 IS 20 DI 10.1103/PhysRevLett.105.202501 LA English AB The beta feeding probability of Tc-102,Tc- 104,Tc- 105,Tc- 106,Tc- 107, Mo-105, and Nb-101 nuclei, which are important contributors to the decay heat in nuclear reactors, has been measured using the total absorption technique. We have coupled for the first time a total absorption spectrometer to a Penning trap in order to obtain sources of very high isobaric purity. Our results solve a significant part of a long-standing discrepancy in the gamma component of the decay heat for Pu-239 in the 4-3000 s range. ER