Kang W G, Choi J H, Jeon E J, Lee J I, Kim H J, Kim S K, Kim Y D, Lee J H, Ma K J, Myung S S, So J H
Physics Department, Sejong University, Seoul 143-747, South Korea.
Appl Radiat Isot. 2013 Nov;81:290-3. doi: 10.1016/j.apradiso.2013.03.057. Epub 2013 Apr 6.
An experiment for the detection of 0νβ(+)/EC and 0νEC/EC in 92Mo nuclei has been carried out with a scintillating crystal, CaMoO4, in coincidence with the HPGe detector. We study the background events inside the event selection window for 0ν β(+)/EC decays of CaMoO4 detector. For 51.2 days of data taking period, we didn't observe any event in the neutrinoless EC/EC decay event window. The (92)Mo 0νβ(+)/EC decay half-life limit was set to 0.61×10(20) years with a 90% confidence by method of Feldman and Cousins. This ultra-low gamma ray measurement utilizing coincidence technique can be used for the resonant EC/EC decay process of some nuclei which is potentially important for neutrinoless double beta decay process.
利用闪烁晶体钼酸钙（CaMoO4）与高纯锗探测器符合测量，开展了一项探测92Mo核中0νβ(+)/EC和0νEC/EC的实验。我们研究了CaMoO4探测器0νβ(+)/EC衰变事件选择窗内的本底事例。在51.2天的数据采集期内，我们在无中微子EC/EC衰变事件窗中未观测到任何事例。采用费尔德曼和考辛斯方法，将(92)Mo的0νβ(+)/EC衰变半衰期限制设定为0.61×10(20)年，置信度为90%。这种利用符合技术的超低伽马射线测量可用于某些核的共振EC/EC衰变过程，这对无中微子双β衰变过程可能具有重要意义。
