ENTRY 14523 20190325 14491452300000001 SUBENT 14523001 20190325 14491452300100001 BIB 11 19 1452300100002 TITLE On the Disintegration of Nitrogen by Fast Neutrons 1452300100003 AUTHOR (H.H.Barschall,M.E.Battat) 1452300100004 REFERENCE (J,PR,70,245,1946) 1452300100005 #doi:10.1103/PhysRev.70.245 1452300100006 REL-REF (O,11296001,C.H.Johnson+,J,PR,80,818,1950) Precise 1452300100007 measurements. 1452300100008 INSTITUTE (1USALAS) 1452300100009 FACILITY (ACCEL,1USAWIS) The University of Wisconsin's 1452300100010 electrostatic generator. 1452300100011 INC-SOURCE (P-LI7) 1452300100012 SAMPLE Spectroscopically pure nitrogen. 1452300100013 DETECTOR (IOCH) It was filled with nitrogen to a pressure of 1452300100014 4.5 atmos. The active volume of the chamber was 2.54 1452300100015 cm in diameter and 10 cm long. 1452300100016 METHOD The neutron flux was monitored by counting the number 1452300100017 of fission pulses occurring in an ionization chamber. 1452300100018 The amount of fissionable material in the chamber was 1452300100019 known. 1452300100020 HISTORY (20190325C) BP 1452300100021 ENDBIB 19 0 1452300100022 NOCOMMON 0 0 1452300100023 ENDSUBENT 22 0 1452300199999 SUBENT 14523002 20190325 14491452300200001 BIB 3 15 1452300200002 REACTION (7-N-14(N,P)6-C-14,,SIG) 1452300200003 ERR-ANALYS (DATA-ERR) Errors in the measurements of the cross 1452300200004 sections are caused by the following facts: 1452300200005 (1) Lack of definition of the peaks, principally 1452300200006 because of wall effects, 1452300200007 (2) Uncertainty in the calibration of the monitor 1452300200008 chamber, 1452300200009 (3) Lack of resolution of the resonances because of 1452300200010 the energy spread of the neutrons, 1452300200011 (4) Large size of the detectors compared to the 1452300200012 distances from the neutron source. It is difficult to 1452300200013 estimate the error caused by these factors. It is not 1452300200014 unreasonable to assume that values of the cross 1452300200015 sections may be in error by 25 percent. 1452300200016 STATUS (CURVE) Fig. 3, page 247. 1452300200017 ENDBIB 15 0 1452300200018 COMMON 1 3 1452300200019 DATA-ERR 1452300200020 PER-CENT 1452300200021 25.0 1452300200022 ENDCOMMON 3 0 1452300200023 DATA 2 32 1452300200024 EN DATA 1452300200025 MEV B 1452300200026 0.195 0.003 1452300200027 0.250 0.003 1452300200028 0.328 0.003 1452300200029 0.386 0.002 1452300200030 0.447 0.002 1452300200031 0.514 0.023 1452300200032 0.543 0.083 1452300200033 0.578 0.045 1452300200034 0.584 0.051 1452300200035 0.691 0.169 1452300200036 0.700 0.130 1452300200037 0.732 0.136 1452300200038 0.755 0.079 1452300200039 0.796 0.026 1452300200040 0.816 0.029 1452300200041 0.833 0.026 1452300200042 0.874 0.017 1452300200043 0.935 0.011 1452300200044 0.964 0.007 1452300200045 0.987 0.012 1452300200046 1.092 0.010 1452300200047 1.193 0.012 1452300200048 1.193 0.015 1452300200049 1.240 0.014 1452300200050 1.289 0.011 1452300200051 1.388 0.043 1452300200052 1.394 0.074 1452300200053 1.443 0.114 1452300200054 1.493 0.048 1452300200055 1.542 0.019 1452300200056 1.585 0.011 1452300200057 1.678 0.009 1452300200058 ENDDATA 34 0 1452300200059 ENDSUBENT 58 0 1452300299999 SUBENT 14523003 20190325 14491452300300001 BIB 3 15 1452300300002 REACTION (7-N-14(N,A)5-B-11,,SIG) 1452300300003 ERR-ANALYS (DATA-ERR) Errors in the measurements of the cross 1452300300004 sections are caused by the following facts: 1452300300005 (1) Lack of definition of the peaks, principally 1452300300006 because of wall effects, 1452300300007 (2) Uncertainty in the calibration of the monitor 1452300300008 chamber, 1452300300009 (3) Lack of resolution of the resonances because of 1452300300010 the energy spread of the neutrons, 1452300300011 (4) Large size of the detectors compared to the 1452300300012 distances from the neutron source. It is difficult to 1452300300013 estimate the error caused by these factors. It is not 1452300300014 unreasonable to assume that values of the cross 1452300300015 sections may be in error by 25 percent. 1452300300016 STATUS (CURVE) Fig. 3, page 247. 1452300300017 ENDBIB 15 0 1452300300018 COMMON 1 3 1452300300019 DATA-ERR 1452300300020 PER-CENT 1452300300021 25.0 1452300300022 ENDCOMMON 3 0 1452300300023 DATA 2 4 1452300300024 EN DATA 1452300300025 MEV B 1452300300026 1.295 0.016 1452300300027 1.495 0.091 1452300300028 1.585 0.035 1452300300029 1.673 0.035 1452300300030 ENDDATA 6 0 1452300300031 ENDSUBENT 30 0 1452300399999 ENDENTRY 3 0 1452399999999