ENTRY 14532 20190425 14511453200000001 SUBENT 14532001 20190425 14511453200100001 BIB 13 32 1453200100002 TITLE Symmetric fission observed in thermal-neutron-induced 1453200100003 and spontaneous fission of 257Fm 1453200100004 AUTHOR (W.John,E.K.Hulet,R.W.Lougheed,J.J.Wesolowski) 1453200100005 INSTITUTE (1USALRL) 1453200100006 REFERENCE (J,PRL,27,45,1971) 1453200100007 #NSR: 1971JO13 1453200100008 #doi:10.1103/PhysRevLett.27.45 1453200100009 FACILITY (REAC,1USALRL) 1453200100010 INC-SOURCE (THCOL) The thermal column of the Livermore reactor in 1453200100011 a flux of 2.e11 n/(cm2 sec) (cadmium ratio 600). 1453200100012 Data were accumulated alternately with the reactor on 1453200100013 and then off. Two separate runs of about three weeks 1453200100014 each were made. 1453200100015 METHOD (COINC,PHD) The fragment masses for each event were 1453200100016 calculated from the kinetic energies, assuming 1453200100017 conservation of momentum and mass. 1453200100018 DETECTOR (SI) Two Si detectors with collimators to limit the 1453200100019 maximum fragment entry angle to 50 degrees from the 1453200100020 normal to the detectors 1453200100021 MONITOR 233U source (2 ng) for neutron-flux determination and 1453200100022 a check on the energy calibration, 1453200100023 252Cf spontaneous-fission source for energy 1453200100024 calibration 1453200100025 SAMPLE The sample, containing 4.e8 atoms of 257Fm, was 1453200100026 obtained from the Hutch underground nuclear explosion. 1453200100027 After final purification, a few microliters of solution1453200100028 containing 257Fm was evaporated on a 200-micro-g/cm2 Pt1453200100029 foil. 1453200100030 CORRECTION A correction was made for the pulse-height defect but 1453200100031 not for neutron emission. 1453200100032 ERR-ANALYS No information 1453200100033 HISTORY (20190424C) OG. 1453200100034 ENDBIB 32 0 1453200100035 COMMON 1 3 1453200100036 MASS-RSL 1453200100037 NO-DIM 1453200100038 3.4 1453200100039 ENDCOMMON 3 0 1453200100040 ENDSUBENT 39 0 1453200199999 SUBENT 14532002 20190425 14511453200200001 BIB 2 2 1453200200002 REACTION (100-FM-257(0,F)MASS,PRV,FY,,REL) 1453200200003 STATUS (CURVE) Fig.2 was digitized by GSYS2.4.7. 1453200200004 ENDBIB 2 0 1453200200005 NOCOMMON 0 0 1453200200006 DATA 2 32 1453200200007 MASS DATA 1453200200008 NO-DIM ARB-UNITS 1453200200009 75.1282 204.3344 1453200200010 78.7912 227.5542 1453200200011 82.0146 264.7059 1453200200012 85.6776 339.0093 1453200200013 89.0476 404.0248 1453200200014 92.7106 575.8514 1453200200015 95.6410 743.0341 1453200200016 99.3040 1012.3839 1453200200017 102.8205 1513.9319 1453200200018 106.1904 2066.5635 1453200200019 109.4139 2670.2786 1453200200020 112.7839 2986.0681 1453200200021 116.4469 3417.9567 1453200200022 119.6703 3580.4954 1453200200023 122.8937 3599.0712 1453200200024 126.2637 3580.4954 1453200200025 129.7802 3580.4954 1453200200026 133.1501 3603.7152 1453200200027 136.8131 3589.7833 1453200200028 140.1831 3427.2446 1453200200029 143.8461 2990.7121 1453200200030 146.9230 2693.4985 1453200200031 150.7325 2085.1393 1453200200032 154.1025 1537.1517 1453200200033 157.6190 1030.9598 1453200200034 161.1355 752.3220 1453200200035 164.3589 575.8514 1453200200036 167.7289 413.3127 1453200200037 171.2453 348.2972 1453200200038 174.7618 283.2817 1453200200039 177.9853 241.4861 1453200200040 181.7948 213.6223 1453200200041 ENDDATA 34 0 1453200200042 ENDSUBENT 41 0 1453200299999 SUBENT 14532003 20190425 14511453200300001 BIB 2 2 1453200300002 REACTION (100-FM-257(N,F)MASS,PRV,FY,,MXW/REL) 1453200300003 STATUS (CURVE) Fig.4 was digitized by GSYS2.4.7. 1453200300004 ENDBIB 2 0 1453200300005 COMMON 1 3 1453200300006 EN-DUMMY 1453200300007 EV 1453200300008 0.0253 1453200300009 ENDCOMMON 3 0 1453200300010 DATA 2 32 1453200300011 MASS DATA 1453200300012 NO-DIM ARB-UNITS 1453200300013 75.4824 118.4471 1453200300014 78.7090 175.0602 1453200300015 82.3195 190.1433 1453200300016 85.6582 259.0019 1453200300017 89.1326 315.5726 1453200300018 92.4831 416.5848 1453200300019 95.5904 665.0273 1453200300020 98.9371 815.1860 1453200300021 102.6287 996.3983 1453200300022 105.6288 1136.1966 1453200300023 109.1813 1330.9049 1453200300024 112.4342 1483.0784 1453200300025 115.6639 1648.7524 1453200300026 118.8847 1925.6527 1453200300027 122.3382 2189.6289 1453200300028 125.4389 2520.8444 1453200300029 128.9133 2520.9816 1453200300030 132.6458 2184.8625 1453200300031 136.1408 1923.7473 1453200300032 139.8684 1649.7080 1453200300033 142.7764 1489.4496 1453200300034 146.4949 1331.8099 1453200300035 150.2160 1140.5436 1453200300036 153.7013 1001.0013 1453200300037 157.3058 820.0771 1453200300038 160.6768 662.4236 1453200300039 164.1702 422.0017 1453200300040 167.6527 318.6726 1453200300041 171.1319 256.7300 1453200300042 174.6112 194.7874 1453200300043 178.2028 176.8225 1453200300044 182.0293 117.4803 1453200300045 ENDDATA 34 0 1453200300046 ENDSUBENT 45 0 1453200399999 ENDENTRY 3 0 1453299999999