1. The empty reference cell run demonstrate that 7/9 background is not from the 3HE in the target cell. The shielding we put in only reduce the background about 10%. I think that we should drop the discussion of reducing background more. Of coz, we still need to make the collimator for the front beam pipe thicker, this should be easily done.
3018 2 3.5 9.91632 10.9977 9.58631 0.113697 0.00248078
3019 4 3.5 17.8961 19.9145 17.4224 0.11646 0.00341339
3020 6 3.5 27.3899 30.5168 26.7449 0.124101 0.00447531
3021 8 3.5 37.3297 41.7227 36.2695 0.134892 0.005858
3022 10 3.5 45.087 50.1607 44.0172 0.143038 0.00799182
3023 12 3.5 45.1858 50.5063 44.1166 0.144841 0.00835857
3032 2 1600 10.7693 11.9639 10.4145 0.113871 0.00295905
3033 2 1650 11.2507 12.3544 10.5742 0.108819 0.00272178
3034 2 1700 13.5428 14.361 12.2325 0.107815 0.00298993
3035 1 1700 8.63383 9.19242 7.7923 0.105977 0.00215889
3036 1 1650 7.0857 7.72128 6.68394 0.109205 0.00251167
3037 1 1600 5.01044 5.47528 4.86614 0.110216 0.0024262
3038 1 1550 4.21155 4.62952 4.07126 0.0837998 0.00153922
3541 2 1600 6.03368 7.00337 5.57203 0.167658 0.0024472 (empty reference cell)
3542 2 1600 4.34369 4.97766 3.88908 0.118927 0.00188275 (empty reference cell)
3543 2 1600 6.15937 7.1313 5.68647 0.170462 0.00261495 (empty reference cell)
3544 2 1600 7.77082 9.23095 8.8987 0.120225 0.00354748 (2uA 3He, new)