ENTRY 14795 20250207 1479500000001 SUBENT 14795001 20250207 20250711 1479500100001 BIB 11 30 1479500100002 TITLE Fast-neutron-induced fission of 240Pu and 242Pu 1479500100003 AUTHOR (A.Pica,A.T.Chemey,W.Loveland) 1479500100004 REFERENCE (J,PR/C,106,044603,2022) 1479500100005 #doi:10.1103/PhysRevC.106.044603 1479500100006 INSTITUTE (1USAORU) 1479500100007 FACILITY (LINAC,1USALAS) 15R beam line at the Los Alamos 1479500100008 National Laboratory, Los Alamos Neutron Science 1479500100009 Center at the Weapons Neutron Research (LANSCE-WNR) 1479500100010 facility. 1479500100011 INC-SOURCE (SPALL) "White spectrum" neutron beams were generated 1479500100012 from an unmoderated tungsten spallation source using 1479500100013 the 800-MeV proton beam from the LANSCE linear 1479500100014 accelerator. 1479500100015 DETECTOR (SI) Fission fragments were detected by nine pairs of 1479500100016 1-cm2 Si p-i-n diode detectors (Hamamatsu S3590-09) 1479500100017 positioned 3.5 cm from the target. 1479500100018 METHOD (TOF) The time of flight of each interacting neutron 1479500100019 was measured using a timing pulse from a Si p-i-n 1479500100020 diode and the accelerator rf signal. The distance 1479500100021 from the spallation target to the Pu targets was 1479500100022 measured to be 1384.9 +- 1.1 cm. The solid angle 1479500100023 covered by the Si p-i-n diodes was ~11% of 2pi. 1479500100024 ANALYSIS The 2E method was used to measure the fission product 1479500100025 masses and their TKE by detecting the fission 1479500100026 products and determining their energies after neutron 1479500100027 emission. 1479500100028 CORRECTION Corrections for PHD, the pulse-height defect, and 1479500100029 energy loss of fragments in the target and backing 1479500100030 foils are also applied. 1479500100031 HISTORY (20250207C) BP 1479500100032 ENDBIB 30 0 1479500100033 NOCOMMON 0 0 1479500100034 ENDSUBENT 33 0 1479500199999 SUBENT 14795002 20250207 20250711 1479500200001 BIB 5 17 1479500200002 REACTION 1(94-PU-240(N,F),PRE,AKE,LF+HF) 1479500200003 2(94-PU-240(N,F),SEC,AKE,LF+HF) 1479500200004 REL-REF (A,10712001,D.R.Nethaway+,J,PR/C,16,1907,1977) 1479500200005 SAMPLE (94-PU-240,ENR=0.99874) The plutonium targets were 1479500200006 prepared by vapor deposition using the method. The 1479500200007 targets consisted of 2-cm-diameter circular deposits 1479500200008 of the Pu isotope on a thin C backing. The target 1479500200009 thickness was 72.3 microg/cm2 (240Pu) (as measured by 1479500200010 alpha spectroscopy). The source material for the 1479500200011 240Pu target was 99.874 wt% 240Pu. The assumed 1479500200012 chemical composition of the targets was that of PuF4. 1479500200013 The C backing thickness was 100 microg/cm2. The 1479500200014 targets were at an angle of 45 degree with respect to 1479500200015 the incident beam. 1479500200016 ERR-ANALYS (DATA-ERR) Error bars are uncertainty on measurements 1479500200017 from the Gaussian fits. 1479500200018 STATUS (TABLE,,A.Pica,J,PR/C,106,044603,2022) - Table V 1479500200019 ENDBIB 17 0 1479500200020 NOCOMMON 0 0 1479500200021 DATA 6 10 1479500200022 EN-MIN EN-MAX DATA 1DATA-ERR 1DATA 2DATA-ERR 21479500200023 MEV MEV MEV MEV MEV MEV 1479500200024 0.55 1.01 177.9 0.5 175.9 0.51479500200025 1.01 1.47 178.0 0.4 175.8 0.41479500200026 1.47 2.17 177.1 0.5 175.0 0.51479500200027 2.17 3.04 177.2 0.5 174.8 0.51479500200028 3.04 4.64 175.1 0.5 173.1 0.51479500200029 4.64 7.35 175.7 0.5 173.2 0.51479500200030 7.35 11.68 175.2 0.5 172.8 0.51479500200031 11.68 24.21 173.2 0.5 170.3 0.41479500200032 24.21 48.34 171.5 0.5 168.5 0.41479500200033 48.34 100. 170.0 0.5 166.6 0.51479500200034 ENDDATA 12 0 1479500200035 ENDSUBENT 34 0 1479500299999 SUBENT 14795003 20250207 20250711 1479500300001 BIB 5 17 1479500300002 REACTION 1(94-PU-242(N,F),PRE,AKE,LF+HF) 1479500300003 2(94-PU-242(N,F),SEC,AKE,LF+HF) 1479500300004 REL-REF (A,21983001,I.Winkelmann+,J,PR/C,30,934,1984) 1479500300005 SAMPLE (94-PU-242,ENR=0.99964) The plutonium targets were 1479500300006 prepared by vapor deposition using the method. The 1479500300007 targets consisted of 2-cm-diameter circular deposits 1479500300008 of the Pu isotope on a thin C backing. The target 1479500300009 thickness was 63.0 microg/cm2 (242Pu) (as measured by 1479500300010 alpha spectroscopy). The source material for the 242Pu 1479500300011 target was 99.964 wt% 242Pu. The assumed chemical 1479500300012 composition of the targets was that of PuF4. The C 1479500300013 backing thickness was 100 microg/cm2. The targets were 1479500300014 at an angle of 45 degree with respect to the incident 1479500300015 beam. 1479500300016 ERR-ANALYS (DATA-ERR) Error bars are uncertainty on measurements 1479500300017 from the Gaussian fits. 1479500300018 STATUS (TABLE,,A.Pica,J,PR/C,106,044603,2022) - Table VI 1479500300019 ENDBIB 17 0 1479500300020 NOCOMMON 0 0 1479500300021 DATA 6 10 1479500300022 EN-MIN EN-MAX DATA 1DATA-ERR 1DATA 2DATA-ERR 21479500300023 MEV MEV MEV MEV MEV MEV 1479500300024 0.62 1.09 179.5 0.4 177.3 0.41479500300025 1.09 1.55 178.7 0.4 176.8 0.41479500300026 1.55 2.26 179.4 0.4 177.1 0.41479500300027 2.26 3.28 177.7 0.4 175.2 0.41479500300028 3.38 5.10 178.0 0.4 175.8 0.41479500300029 5.10 8.36 177.8 0.4 175.3 0.41479500300030 8.36 13.97 176.5 0.4 174.3 0.41479500300031 13.97 29.86 174.7 0.4 171.9 0.41479500300032 29.86 42.50 173.1 0.4 170.1 0.41479500300033 42.50 100. 171.8 0.4 168.5 0.41479500300034 ENDDATA 12 0 1479500300035 ENDSUBENT 34 0 1479500399999 ENDENTRY 3 0 1479599999999