ENTRY C2480 20200225 C191C248000000001 SUBENT C2480001 20200225 C191C248000100001 BIB 10 18 C248000100002 TITLE Direct interaction effects in the fission of 238U C248000100003 with 63.5 MeV 4He ions C248000100004 AUTHOR (V.E.Viola Jr,M.M.Minor,A.E.Salwin,R.O.Bondelid, C248000100005 R.B.Theus) C248000100006 REFERENCE (J,NP/A,174,321,1971) C248000100007 #doi:10.1016/0375-9474(71)90665-8 C248000100008 INSTITUTE (1USAMRY,1USANRL) C248000100009 FACILITY (CYCLO,1USANRL) The Naval Research Laboratory C248000100010 Cyclotron in Washington, DC. C248000100011 INC-SPECT Beam currents were typically 100-400 nA and the C248000100012 measured beam width was 1.6 mm. C248000100013 SAMPLE The target was composed of 75 microg/cm2 enriched C248000100014 238UF4 which had been vaporized onto a 100 microg/cm2 C248000100015 nickel foil. C248000100016 DETECTOR (SIBAR) Normal surface-barrier semiconductor detectors.C248000100017 METHOD Measurement of both in-plane and out-of-plane angular C248000100018 correlations for binary fission events. C248000100019 HISTORY (20200225C) BP C248000100020 ENDBIB 18 0 C248000100021 COMMON 1 3 C248000100022 EN C248000100023 MEV C248000100024 63.5 C248000100025 ENDCOMMON 3 0 C248000100026 ENDSUBENT 25 0 C248000199999 SUBENT C2480002 20200225 C191C248000200001 BIB 4 14 C248000200002 REACTION ((92-U-238(A,F),DI,SIG)/(92-U-238(A,F),,SIG)) C248000200003 ANALYSIS The in-plane angular correlations are not symmetric. C248000200004 Reflection of the low-angle portion of the angular C248000200005 correlation selects the events which fall under this C248000200006 symmetrized curve that are assigned to compound C248000200007 nucleus formation reactions. The remaining events are C248000200008 attributed to non-compound-nucleus (NCN) fission C248000200009 events. C248000200010 ERR-ANALYS (DATA-ERR) The errors quoted here reflect C248000200011 experimental errors due to counting statistics and C248000200012 angular resolution as well as uncertainties C248000200013 originating in the method of integrating the angular C248000200014 correlation functions. C248000200015 STATUS (TABLE) page 331. C248000200016 ENDBIB 14 0 C248000200017 NOCOMMON 0 0 C248000200018 DATA 2 1 C248000200019 DATA DATA-ERR C248000200020 NO-DIM NO-DIM C248000200021 0.075 0.01 C248000200022 ENDDATA 3 0 C248000200023 ENDSUBENT 22 0 C248000299999 SUBENT C2480003 20200225 C191C248000300001 BIB 5 20 C248000300002 REACTION 1(92-U-238(A,F),SEC,AKE,LF+HF) Gross spectrum. C248000300003 2(92-U-238(A,F),PRE,AKE,LF+HF) Gross spectrum. C248000300004 ANALYSIS The average initial (i.e. before neutron evaporation) C248000300005 total kinetic energy release in the c.m. system is C248000300006 found to be 173.3+-5.4 MeV from the gross correlation C248000300007 events and 170.9 MeV and 173.5 MeV respectively for C248000300008 the 80 and 82 degrees out-of- plane correlation C248000300009 measurements. C248000300010 ERR-ANALYS (DATA-ERR) The absolute errors for the total kinetic C248000300011 energy release range from +-4.0 MeV for the most C248000300012 probable angles to about +-6.0 MeV for angles on the C248000300013 wings of the angular correlation; however, the C248000300014 relative error between these points is considerably C248000300015 better than this. It is assumed that on the average C248000300016 3.5 neutrons per fragment are evaporated from the C248000300017 fragments for each fission. C248000300018 FLAG 2(1.) Corrected for neutron evaporation assuming C248000300019 nubar=7.1 for compound nucleus events and nubar=3.5 C248000300020 for NCN (Non-Compound Nucleus) processes. C248000300021 STATUS (TABLE) Table 3, page 333. C248000300022 ENDBIB 20 0 C248000300023 NOCOMMON 0 0 C248000300024 DATA 5 1 C248000300025 DATA-CM 1DATA-ERR 1DATA-CM 2DATA-ERR 2FLAG 2 C248000300026 MEV MEV MEV MEV NO-DIM C248000300027 168.4 4.0 173.3 5.4 1. C248000300028 ENDDATA 3 0 C248000300029 ENDSUBENT 28 0 C248000399999 ENDENTRY 3 0 C248099999999