Chromium Pile Sample: Chromium metal powder, 99.7 kg Chemical composition Cr >99.78% Fe 0.16% C 0.021 % Si 0.007 % Container: 40 cm stainless steel vessel (Type-II) Apparent density: 3.72 g/cm3 Sample thickness: 0.7 mean free paths for 14 MeV neutrons Date of experiment: Aug. 21, 1986 Neutron source spectrum is given in the Table 4.6. Numerical data of measured leakage current spectrum from Cr pile of 40 cm. ======================================================== Upper Lower Lethargy Error energy energy Flux (MeV) (MeV) (1/MeV/n) ======================================================== 20.25 19.652 .0004644 .000123 19.652 19.071 .0004977 .0001259 19.071 18.507 .0009858 .0001537 18.507 17.96 .001609 .0001899 17.96 17.429 .003581 .0002677 17.429 16.914 .006125 .000343 16.914 16.414 .009145 .0004149 16.414 15.929 .0357 .0008065 15.929 15.458 .2046 .001921 15.458 15.002 1.214 .004677 15.002 14.558 4.252 .008769 14.558 14.128 6.636 .011 14.128 13.71 3.294 .007759 13.71 13.305 .8774 .003968 13.305 12.912 .4863 .002928 12.912 12.53 .3351 .002428 12.53 12.16 .2488 .002096 12.16 11.801 .1879 .001825 11.801 11.452 .1371 .00156 11.452 11.113 .1074 .001381 11.113 10.785 .08964 .001259 10.785 10.466 .07864 .001162 10.466 10.157 .06971 .001078 10.157 9.8567 .06322 .001013 9.8567 9.5654 .06597 .001036 9.5654 9.2827 .06656 .001042 9.2827 9.0084 .06373 .001021 9.0084 8.7422 .05886 .0009666 8.7422 8.4838 .05405 .0009133 8.4838 8.2331 .05172 .0008814 8.2331 7.9897 .05181 .0008708 7.9897 7.7536 .04914 .000838 7.7536 7.5244 .05222 .0008536 7.5244 7.3021 .05196 .0008434 7.3021 7.0863 .05214 .0008393 7.0863 6.8768 .05325 .0008427 6.8768 6.6736 .05477 .0008494 6.6736 6.4764 .05509 .0008469 6.4764 6.2849 .0576 .000861 6.2849 6.0992 .05981 .0008725 6.0992 5.9189 .06189 .0008825 5.9189 5.744 .0628 .000884 5.744 5.5742 .06349 .0008841 5.5742 5.4095 .06703 .0009035 5.4095 5.2496 .06638 .0008948 5.2496 5.0945 .07095 .0009205 5.0945 4.9439 .0728 .0009281 4.9439 4.7978 .07532 .0009294 4.7978 4.656 .07692 .0009256 4.656 4.5184 .07762 .0009172 4.5184 4.3849 .08128 .0009263 4.3849 4.2553 .08335 .0009266 4.2553 4.1295 .08368 .0009177 4.1295 4.0075 .08495 .0009152 4.0075 3.889 .08579 .000912 3.889 3.7741 .08943 .0009237 3.7741 3.6625 .09155 .0009274 3.6625 3.5543 .09458 .0009357 3.5543 3.4493 .09979 .0009544 3.4493 3.3473 .09861 .0009424 3.3473 3.2484 .1032 .0009565 3.2484 3.1524 .1045 .0009544 3.1524 3.0592 .1071 .0009579 3.0592 2.9688 .1111 .0009679 2.9688 2.8811 .1145 .0009753 2.8811 2.7959 .1154 .0009725 2.7959 2.7133 .1171 .0009728 2.7133 2.6331 .1194 .0009772 2.6331 2.5553 .1198 .0009735 2.5553 2.4798 .1256 .0009921 2.4798 2.4065 .1286 .000999 2.4065 2.3353 .1284 .0009939 2.3353 2.2663 .1372 .001023 2.2663 2.1993 .1428 .001039 2.1993 2.1343 .1388 .001019 2.1343 2.0713 .1338 .000995 2.0713 2.0101 .1401 .001013 2.0101 1.9506 .1467 .001032 1.9506 1.893 .1519 .001045 1.893 1.8371 .1559 .001054 1.8371 1.7828 .1555 .001051 1.7828 1.7301 .1584 .001059 1.7301 1.6789 .1559 .00105 1.6789 1.6293 .164 .001075 1.6293 1.5812 .1717 .001099 1.5812 1.5344 .1691 .00109 1.5344 1.4891 .1721 .001098 1.4891 1.4451 .1709 .001092 1.4451 1.4024 .1661 .001075 1.4024 1.3609 .1658 .001072 1.3609 1.3207 .181 .001117 1.3207 1.2817 .1907 .001145 1.2817 1.2438 .1901 .001141 1.2438 1.207 .1886 .001134 1.207 1.1714 .1858 .001123 1.1714 1.1367 .2056 .001178 1.1367 1.1031 .2217 .00122 1.1031 1.0705 .2179 .001206 1.0705 1.0389 .199 .00115 1.0389 1.0082 .1912 .001125 1.0082 .9784 .195 .001135 .9784 .94948 .1851 .001107 .94948 .92142 .1804 .001093 .92142 .89419 .1879 .001116 .89419 .86776 .1746 .001076 .86776 .84211 .1614 .001035 .84211 .81723 .1612 .001035 .81723 .79307 .1668 .001059 .79307 .76963 .1677 .001067 .76963 .74689 .1787 .001108 .74689 .72481 .1693 .001085 .72481 .70339 .1596 .001059 .70339 .6826 .1662 .001086 .6826 .66243 .1799 .001138 .66243 .64285 .1833 .001161 .64285 .62385 .1712 .001135 .62385 .60542 .1428 .001048 .60542 .58752 .1246 .0009899 .58752 .57016 .1464 .001084 .57016 .55331 .1559 .00113 .55331 .53696 .1467 .001118 .53696 .52109 .1227 .001045 .52109 .50569 .1173 .001044 .50569 .49074 .1239 .001096 .49074 .47624 .1128 .00107 .47624 .46216 .09453 .001003 .46216 .4485 .08164 .0009561 .4485 .43525 .09574 .001063 .43525 .42238 .1099 .001171 .42238 .4099 .09101 .0011 .4099 .39779 .07929 .00106 .39779 .38603 .07187 .001044 .38603 .37462 .09082 .001208 .37462 .36355 .1149 .001402 .36355 .35281 .105 .001382 .35281 .34238 .1024 .001409 .34238 .33226 .09764 .001422 .33226 .32244 .08206 .001352 .32244 .31291 .06355 .00124 .31291 .30366 .06419 .001293 .30366 .29469 .07497 .001442 .29469 .28598 .0805 .001549 .28598 .27753 .07896 .001597 .27753 .26932 .07017 .001576 .26932 .26137 .06416 .001582 .26137 .25364 .05993 .001609 .25364 .24614 .05354 .001611 .24614 .23887 .04133 .001482 .23887 .23181 .03239 .001383 .23181 .22496 .03036 .00139 .22496 .21831 .02698 .001373 .21831 .21186 .02654 .001411 .21186 .2056 .0282 .001502 .2056 .19952 .03148 .001679 .19952 .19362 .03069 .001804 .19362 .1879 .03095 .00198 .1879 .18235 .02803 .002132 .18235 .17696 .02883 .002428 .17696 .17173 .02415 .002694 .17173 .16665 .03032 .003323 .16665 .16173 .02904 .003507 .16173 .15695 .02613 .003677 .15695 .15231 .02563 .003942 .15231 .14781 .02875 .004343 .14781 .14344 .02347 .004576 .14344 .1392 .01921 .004898 .1392 .13509 .02379 .005547 .13509 .13109 .03289 .006429 .13109 .12722 .02891 .007111 .12722 .12346 .0498 .008666 .12346 .11981 .05699 .01017 .11981 .11627 .0466 .0117 .11627 .11283 .06765 .01485 .11283 .1095 .05269 .01852 .1095 .10626 .05835 .02598 .10626 .10312 .07673 .04337 .10312 .10008 .2416 .1292