Scintillation properties of calcium molybdate are investigated. The emission spectrum is broad with a maximum at 520 nm. At room temperature the light yield is 4% of CsI(Tl) (400 photoelectrons/MeV) and the decay time is 17 μs. During cooling the light yield and decay time increase. Prospects of optimization of this scintillator are also discussed. The feasibility of the material for the search of neutrinoless double beta decay of 100Mo is analyzed. A half life limit of T1/2 = 1 · 1025 years (68% CL) seems feasible with CaMoO4 scintillator, running with 10 kg of 100Mo for 5 years. The background due to two neutrino double beta decay of 48Ca is also considered. Requirements for new scintillators for double beta decay search are formulated.
Bibliographical noteFunding Information:
Manuscript received November 15, 2004; revised March 11, 2005. This work was supported in part by the Creative Research Initiative Program of Korea Science and Engineering Foundation and in part by INTAS. S. Belogurov and V. Kornoukhov are with the Institute for Theoretical and Experimental Physics, Moscow, 117259 Russia (e-mail: firstname.lastname@example.org). A. Annenkov, A. Borisevich, A. Fedorov, M. Korzhik, V. Ligoun, and O. Mis-sevitch are with the Institute for Nuclear Problems, Minsk, 220050 Belarus. S. K. Kim, S. C. Kim, S. Y. Kim, J. W. Kwak, H. S. Lee, J. Lee, S. S. Myung, and M. J. Lee are with the Seoul National University, Seoul, 151-742 Korea. Y. D. Kim, J. Y. Lee, and J. I. Lee are with the Sejong University, Seoul, 143-747 Korea. H. J. Kim is with the Kyungpook National University, Taegu, 702-701 Korea. Y. J. Kwon and M. J. Hwang are with the Yonsei University, Seoul, 120-749 Korea. J. J. Zhu is with the Tsinghua University, Beijing, China. Digital Object Identifier 10.1109/TNS.2005.852678
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering