Aluminum Pile Sample: Aluminum metal powder (grain size: 80 % between 0.2 and 1.0 mm), 32.8 kg Chemical composition A1 >99.7% Si <0.15% Fe c0.20 % Cu <0.01 % Container 40 cm stainless steel vessel (Type-II) Apparent density: 1.22 g/cm3 Sample thickness: 0.5 mean free paths for 14 MeV neutrons Date of experiment: Dec. 22, 1988 Neutron source spectrum is given in the Table 4.4. Numerical data of measured leakage current spectrum from Al pile of 40 cm. ======================================================== Upper Lower Lethargy Error energy energy Flux (MeV) (MeV) (1/MeV/n) ======================================================== 20.66 19.85 .000441 .0003812 19.85 19.072 .0004715 .0003861 19.072 18.324 .001259 .0004252 18.324 17.605 .002431 .0004761 17.605 16.915 .00306 .0005026 16.915 16.252 .02432 .001018 16.252 15.615 .4853 .00424 15.615 15.002 3.5 .01135 15.002 14.414 6.44 .01542 14.414 13.849 3.767 .01184 13.849 13.306 1.026 .0062 13.306 12.784 .4452 .004101 12.784 12.283 .318 .003474 12.283 11.801 .2486 .003078 11.801 11.339 .2127 .002847 11.339 10.894 .171 .002555 10.894 10.467 .1234 .002151 10.467 10.056 .1022 .001931 10.056 9.662 .08692 .001765 9.662 9.2832 .08239 .001711 9.2832 8.9192 .07791 .001657 8.9192 8.5694 .07218 .001588 8.5694 8.2334 .06282 .001479 8.2334 7.9106 .06195 .00146 7.9106 7.6004 .06315 .001465 7.6004 7.3024 .06145 .001437 7.3024 7.0161 .06483 .001453 7.0161 6.741 .06868 .001474 6.741 6.4766 .07071 .001476 6.4766 6.2227 .06948 .001448 6.2227 5.9787 .07135 .001451 5.9787 5.7443 .07129 .001437 5.7443 5.519 .07479 .001456 5.519 5.3026 .0764 .001458 5.3026 5.0947 .07666 .001453 5.0947 4.8949 .0806 .001484 4.8949 4.703 .07946 .001471 4.703 4.5186 .08407 .001508 4.5186 4.3414 .08986 .001553 4.3414 4.1712 .08775 .001532 4.1712 4.0076 .08939 .001543 4.0076 3.8505 .09169 .001559 3.8505 3.6995 .09163 .001531 3.6995 3.5545 .09326 .001518 3.5545 3.4151 .08851 .001459 3.4151 3.2812 .08812 .001435 3.2812 3.1525 .0901 .001431 3.1525 3.0289 .09188 .001427 3.0289 2.9101 .09233 .001413 2.9101 2.796 .0971 .001437 2.796 2.6864 .1032 .001474 2.6864 2.5811 .1002 .001449 2.5811 2.4799 .09417 .001403 2.4799 2.3826 .09564 .00141 2.3826 2.2892 .1012 .001444 2.2892 2.1994 .1001 .001433 2.1994 2.1132 .09916 .001423 2.1132 2.0303 .1006 .001423 2.0303 1.9507 .09723 .001392 1.9507 1.8742 .09895 .001396 1.8742 1.8008 .09852 .001385 1.8008 1.7301 .09988 .001387 1.7301 1.6623 .0956 .001352 1.6623 1.5971 .09448 .001339 1.5971 1.5345 .09417 .001335 1.5345 1.4743 .09099 .001315 1.4743 1.4165 .08882 .001302 1.4165 1.361 .08542 .001281 1.361 1.3076 .0871 .001294 1.3076 1.2563 .09031 .001318 1.2563 1.2071 .08818 .001305 1.2071 1.1598 .0869 .001298 1.1598 1.1143 .0814 .001253 1.1143 1.0706 .07953 .001233 1.0706 1.0286 .08255 .001249 1.0286 .98827 .078 .001211 .98827 .94952 .07351 .001174 .94952 .91229 .07729 .001196 .91229 .87652 .07811 .001198 .87652 .84215 .07278 .001156 .84215 .80913 .06588 .001103 .80913 .7774 .0607 .001061 .7774 .74692 .05496 .001014 .74692 .71763 .05651 .001024 .71763 .6895 .05971 .001047 .6895 .66246 .05772 .00103 .66246 .63648 .05723 .001025 .63648 .61153 .04957 .000962 .61153 .58755 .0496 .000961 .58755 .56451 .05114 .0009726 .56451 .54238 .04582 .0009277 .54238 .52111 .0462 .0009303 .52111 .50068 .04038 .0008798 .50068 .48105 .03954 .0008721 .48105 .46218 .03631 .0008469 .46218 .44406 .03237 .0008171 .44406 .42665 .03078 .0008087 .42665 .40992 .02412 .0007475 .40992 .39385 .02476 .0007613 .39385 .3784 .02779 .0007999 .3784 .36357 .03073 .0008362 .36357 .34931 .02944 .0008305 .34931 .33561 .03068 .0008543 .33561 .32245 .03111 .0008699 .32245 .30981 .02788 .0008489 .30981 .29766 .02134 .0007904 .29766 .28599 .01888 .0007738 .28599 .27478 .01638 .0007558 .27478 .264 .0136 .0007332 .264 .25365 .02091 .0008384 .25365 .24371 .02257 .000883 .24371 .23415 .02166 .0008998 .23415 .22497 .01889 .0008959 .22497 .21615 .01547 .0008837 .21615 .20767 .01231 .000874 .20767 .19953 .008257 .0008514 .19953 .19171 .007314 .000872 .19171 .18419 .008653 .000942 .18419 .17697 .01239 .001048 .17697 .17003 .01198 .001103 .17003 .16336 .01321 .001185 .16336 .15696 .01015 .001217 .15696 .1508 .003615 .001206 .1508 .14489 .004657 .001307 .14489 .13921 .004172 .001404 .13921 .13375 .005602 .00155 .13375 .1285 .009426 .001744 .1285 .12347 .01149 .001935 .12347 .11862 .009435 .002097 .11862 .11397 .008838 .002309 .11397 .1095 .008544 .002564 .1095 .10521 .01159 .002912 .10521 .10109 .01289 .003257 .10109 .097122 .00623 .003557 ========================================================