APEX: WEAK POSITIVE EVIDENCE FOR 800 keV SHARP PAIRS

摘要

The published APEX data exhibit a sharp pair line (123±46 counts) of width 23.4 keV at a sum energy of 793±7 keV, according to a chi-squared analysis. Confidence Level analysis of the APEX data also implies at the 99% confidence level a mean sharp pair value greater than 23 and fewer than 146 sharp pairs in the 20 keV bin at 790 keV. For our best fitting line shape, these bounds correspond to total sharp pair counts greater than 24 and less than 217. These results, and others based upon the combining of two and three bins, all agree that some sharp pair count greater than 23 and less than 251 should be expected in any repetition of the APEX experiment. All of these implications of the APEX data also honor the sharp pair upper bound (292 counts near 800 keV) inferred by APEX from the same data.