ENTRY 14066 20140416 14011406600000001 SUBENT 14066001 20140416 14011406600100001 BIB 12 48 1406600100002 INSTITUTE (1USABRK,3ISLWZI) 1406600100003 REFERENCE (J,PR,156,1283,1967) 1406600100004 (J,PRL,13,438,1964) - prelim. publ. 1406600100005 AUTHOR (Z.Fraenkel) 1406600100006 TITLE Emission of long-range alpha particles in the 1406600100007 spontaneous fission of Cf-252 1406600100008 SAMPLE Cf-252 sample with about 1.54E7 spontaneous fission per1406600100009 minutes, on 100 microg/cm2 nickel backing 1406600100010 METHOD (PHD,COINC) triple coincidence LF,HF,LRA 1406600100011 .The singles counting rates in the two fission-fragment1406600100012 counters were approximately 1.5 x 10**5 counts/min. 1406600100013 .The singles counting rate of the a counter was appro- 1406600100014 ximately 500 counts/min, and the triple-coincidence 1406600100015 rate was approximately 8.5 counts/min for an angle of 1406600100016 90. degr. between the fission and a counters. 1406600100017 .The 'alpha-particle' events do therefore include a 1406600100018 small fraction of events in which other Z>=2 particles 1406600100019 were emitted. 1406600100020 DETECTOR (SILI) The alpha-particle counter assembly consisted 1406600100021 of two Li-drifted Si detectors of 1-cm diam placed on 1406600100022 top of each other and connected in parallel. 1406600100023 * The two alpha-particle lines at 6.63 MeV (Es-253) 1406600100024 and at 5.48 MeV (Am-24l) served as calibration 1406600100025 points for the alpha-particle counter. 1406600100026 (IOCH) Double fission chamber. The two fission-fragment1406600100027 counter assemblies consisted each of two guard-ring 1406600100028 P-diffused solid-state detectors of 2.S-cm diam 1406600100029 (1700 cm3 base material) connected in parallel and 1406600100030 placed on top of each other. 1406600100031 * The fission-fragment counters were calibrated 1406600100032 using the two peaks of the single-fragment energy 1406600100033 distribution in binary fission of Cf-252. The energy1406600100034 values for the two peaks were taken from the 1406600100035 time-of-flight measurement of Fraser (see REL-REF). 1406600100036 REL-REF (R,,J.S.Fraser+,J,CJP,41,2080,1963) 1406600100037 CORRECTION Corrected for the finite size of the detectors and the 1406600100038 source. 1406600100039 COMMENT Experimental system did not differentiate between 1406600100040 alpha particles and other Z>=2 particles emitted in 1406600100041 the fission process. The "alpha-particle" events do 1406600100042 therefore include a small fraction of events in which 1406600100043 other Z >= 2. particles were emitted. 1406600100044 ADD-RES More information in the article (Figs.10,11,12 and 14) 1406600100045 function of mass ratio not coded in this compilation 1406600100046 HISTORY (20051215C) DR 1406600100047 (20120812U) SD: INC-SOURCE was deleted. 1406600100048 (20140416A) SD: REACTION code corrected in Subent 2-4. 1406600100049 ANG -> ANG-RL in Subents 2-4. 1406600100050 ENDBIB 48 0 1406600100051 NOCOMMON 0 0 1406600100052 ENDSUBENT 51 0 1406600199999 SUBENT 14066002 20140416 14011406600200001 BIB 5 8 1406600200002 REACTION (98-CF-252(0,F)2-HE-4,TER,FY/DA,A+LF,REL) 1406600200003 LRA (long-range alpha-particles) angular distribution 1406600200004 EN-SEC ANG-RL - angle between the alpha-particle counter and 1406600200005 the direction of the light fragment 1406600200006 ERR-ANALYS No information 1406600200007 STATUS (CURVE) Data taken from Fig. 2 of PR,156,1283 1406600200008 HISTORY (20140416A) SD: SF4=He-4 added, SF6=DA -> FY/DA, 1406600200009 SF7=A -> A+LF in REACTION code. ANG -> ANG-RL. 1406600200010 ENDBIB 8 0 1406600200011 NOCOMMON 0 0 1406600200012 DATA 2 10 1406600200013 ANG-RL DATA 1406600200014 ADEG ARB-UNITS 1406600200015 60.0 4.38 1406600200016 70.0 13.40 1406600200017 75.0 16.70 1406600200018 80.0 18.20 1406600200019 85.0 17.50 1406600200020 90.0 15.20 1406600200021 95.0 11.60 1406600200022 100.0 7.45 1406600200023 110.0 2.07 1406600200024 120.0 1.35 1406600200025 ENDDATA 12 0 1406600200026 ENDSUBENT 25 0 1406600299999 SUBENT 14066003 20140416 14011406600300001 BIB 6 14 1406600300002 REACTION (98-CF-252(0,F)2-HE-4,TER,FY/DA/DE,A+FF/A,REL) 1406600300003 The kinetic-energy distribution of correlated with the 1406600300004 fission fragment direction 1406600300005 EN-SEC (E,A) 1406600300006 ANG-RL - angle between the alpha-particle counter and 1406600300007 the direction of the fission-fragment counters 1406600300008 METHOD (COINC) The alpha-particle energy distribution obtained1406600300009 in coincidence with the two fission fragments at an 1406600300010 angle of 90.degr. between the alpha-particle counter 1406600300011 and the fission-fragment counters 1406600300012 ERR-ANALYS No information 1406600300013 STATUS (CURVE) Data from Fig. 3 (black circles) of PR,156,12831406600300014 HISTORY (20140416A) SD: SF4=He-4 added, SF6=DA/DE -> FY/DA/DE, 1406600300015 SF7=A -> A+FF/A in REACTION code. ANG -> ANG-RL. 1406600300016 ENDBIB 14 0 1406600300017 COMMON 1 3 1406600300018 ANG-RL 1406600300019 ADEG 1406600300020 90. 1406600300021 ENDCOMMON 3 0 1406600300022 DATA 2 34 1406600300023 E DATA 1406600300024 MEV ARB-UNITS 1406600300025 12.2 3.92 1406600300026 12.7 3.86 1406600300027 13.1 3.98 1406600300028 13.7 4.01 1406600300029 14.2 3.92 1406600300030 14.6 3.97 1406600300031 15.2 3.85 1406600300032 15.7 3.72 1406600300033 16.1 3.70 1406600300034 16.7 3.49 1406600300035 17.1 3.32 1406600300036 17.7 3.16 1406600300037 18.2 2.81 1406600300038 18.7 2.59 1406600300039 19.2 2.33 1406600300040 19.7 2.10 1406600300041 20.2 1.88 1406600300042 20.7 1.63 1406600300043 21.2 1.48 1406600300044 21.7 1.25 1406600300045 22.3 1.05 1406600300046 22.8 0.85 1406600300047 23.3 0.69 1406600300048 23.7 0.57 1406600300049 24.2 0.48 1406600300050 24.7 0.36 1406600300051 25.2 0.27 1406600300052 25.7 0.19 1406600300053 26.2 0.14 1406600300054 26.7 0.10 1406600300055 27.2 0.07 1406600300056 27.7 0.05 1406600300057 28.2 0.05 1406600300058 28.7 0.03 1406600300059 ENDDATA 36 0 1406600300060 ENDSUBENT 59 0 1406600399999 SUBENT 14066004 20140416 14011406600400001 BIB 5 12 1406600400002 REACTION (98-CF-252(0,F)2-HE-4,TER,FY/DE,,REL) 1406600400003 The kinetic-energy distribution of uncorrelated with 1406600400004 the fission fragment direction. The alpha-particle 1406600400005 spectrum is measured without a coincidence requirement 1406600400006 (i.e., without regard to the angle with respect to 1406600400007 the fission fragments). The alpha-particle threshold 1406600400008 in this experiment was normally 10 MeV. 1406600400009 EN-SEC (E,A) 1406600400010 ERR-ANALYS No information 1406600400011 STATUS (CURVE) Data from Fig. 3 (open circles) of PR,156,1283 1406600400012 HISTORY (20140416A) SD: SF4=He-4 added, SF6=DA -> FY/DE, 1406600400013 SF7=A deleted in REACTION code. 1406600400014 ENDBIB 12 0 1406600400015 NOCOMMON 0 0 1406600400016 DATA 2 36 1406600400017 E DATA 1406600400018 MEV ARB-UNITS 1406600400019 12.2 4.08 1406600400020 12.7 4.13 1406600400021 13.2 4.25 1406600400022 13.7 4.27 1406600400023 14.2 4.41 1406600400024 14.7 4.41 1406600400025 15.2 4.39 1406600400026 15.6 4.37 1406600400027 16.2 4.35 1406600400028 16.7 4.30 1406600400029 17.1 4.23 1406600400030 17.7 4.08 1406600400031 18.1 3.92 1406600400032 18.7 3.67 1406600400033 19.2 3.47 1406600400034 19.7 3.22 1406600400035 20.2 2.91 1406600400036 20.7 2.68 1406600400037 21.2 2.39 1406600400038 21.7 2.15 1406600400039 22.2 1.86 1406600400040 22.7 1.63 1406600400041 23.2 1.42 1406600400042 23.7 1.19 1406600400043 24.2 1.02 1406600400044 24.7 0.85 1406600400045 25.2 0.70 1406600400046 25.7 0.57 1406600400047 26.2 0.47 1406600400048 26.7 0.37 1406600400049 27.2 0.27 1406600400050 27.7 0.22 1406600400051 28.3 0.17 1406600400052 28.7 0.13 1406600400053 29.2 0.09 1406600400054 29.7 0.05 1406600400055 ENDDATA 38 0 1406600400056 ENDSUBENT 55 0 1406600499999 SUBENT 14066005 20051216 13391406600500001 BIB 4 5 1406600500002 REACTION (98-CF-252(0,F),TER,DA/DE,A,REL) 1406600500003 EN-SEC ANG is alpha angle 1406600500004 E-MIN and E-MAX are A energy 1406600500005 ERR-ANALYS No information 1406600500006 STATUS (CURVE) Data taken from Fig. 9 1406600500007 ENDBIB 5 0 1406600500008 NOCOMMON 0 0 1406600500009 DATA 4 84 1406600500010 E-MIN E-MAX ANG DATA 1406600500011 MEV MEV ADEG ARB-UNITS 1406600500012 11. 13. 5.99E+01 5.79E-01 1406600500013 11. 13. 6.98E+01 1.81E+00 1406600500014 11. 13. 7.50E+01 2.31E+00 1406600500015 11. 13. 7.97E+01 2.57E+00 1406600500016 11. 13. 8.53E+01 2.49E+00 1406600500017 11. 13. 9.00E+01 2.15E+00 1406600500018 11. 13. 9.50E+01 1.61E+00 1406600500019 11. 13. 1.00E+02 1.01E+00 1406600500020 11. 13. 1.05E+02 4.61E-01 1406600500021 11. 13. 1.09E+02 9.37E-02 1406600500022 17. 19. 6.01E+01 2.61E-01 1406600500023 17. 19. 7.01E+01 1.45E+00 1406600500024 17. 19. 7.52E+01 1.92E+00 1406600500025 17. 19. 8.00E+01 2.13E+00 1406600500026 17. 19. 8.50E+01 2.05E+00 1406600500027 17. 19. 9.01E+01 1.75E+00 1406600500028 17. 19. 9.50E+01 1.30E+00 1406600500029 17. 19. 9.98E+01 8.49E-01 1406600500030 17. 19. 1.05E+02 4.82E-01 1406600500031 17. 19. 1.10E+02 2.86E-01 1406600500032 19. 20. 6.03E+01 1.00E+00 1406600500033 19. 20. 7.01E+01 2.12E+00 1406600500034 19. 20. 7.52E+01 2.61E+00 1406600500035 19. 20. 8.03E+01 2.94E+00 1406600500036 19. 20. 8.51E+01 3.02E+00 1406600500037 19. 20. 9.01E+01 2.84E+00 1406600500038 19. 20. 9.51E+01 2.42E+00 1406600500039 19. 20. 1.00E+02 1.84E+00 1406600500040 19. 20. 1.05E+02 1.17E+00 1406600500041 19. 20. 1.09E+02 5.52E-01 1406600500042 19. 23. 6.01E+01 3.65E-01 1406600500043 19. 23. 7.02E+01 1.30E+00 1406600500044 19. 23. 7.52E+01 1.70E+00 1406600500045 19. 23. 8.02E+01 1.91E+00 1406600500046 19. 23. 8.52E+01 1.91E+00 1406600500047 19. 23. 8.99E+01 1.71E+00 1406600500048 19. 23. 9.51E+01 1.39E+00 1406600500049 19. 23. 1.00E+02 1.04E+00 1406600500050 19. 23. 1.04E+02 7.53E-01 1406600500051 19. 23. 1.10E+02 5.66E-01 1406600500052 21. 22. 6.02E+01 1.03E+00 1406600500053 21. 22. 7.01E+01 1.36E+00 1406600500054 21. 22. 7.51E+01 1.38E+00 1406600500055 21. 22. 8.00E+01 1.38E+00 1406600500056 21. 22. 8.51E+01 1.36E+00 1406600500057 21. 22. 9.02E+01 1.29E+00 1406600500058 21. 22. 9.53E+01 1.18E+00 1406600500059 21. 22. 1.00E+02 1.01E+00 1406600500060 21. 22. 1.04E+02 7.95E-01 1406600500061 21. 22. 1.10E+02 5.10E-01 1406600500062 21. 22. 1.20E+02 3.38E-02 1406600500063 23. 25. 6.03E+01 6.90E-01 1406600500064 23. 25. 7.01E+01 7.64E-01 1406600500065 23. 25. 7.51E+01 8.35E-01 1406600500066 23. 25. 7.99E+01 9.18E-01 1406600500067 23. 25. 8.51E+01 9.38E-01 1406600500068 23. 25. 9.01E+01 9.54E-01 1406600500069 23. 25. 9.50E+01 9.29E-01 1406600500070 23. 25. 1.00E+02 8.74E-01 1406600500071 23. 25. 1.05E+02 7.74E-01 1406600500072 23. 25. 1.10E+02 6.90E-01 1406600500073 23. 25. 1.20E+02 3.34E-01 1406600500074 23. 30. 5.99E+01 2.90E-01 1406600500075 23. 30. 7.00E+01 2.87E-01 1406600500076 23. 30. 7.48E+01 3.05E-01 1406600500077 23. 30. 8.01E+01 3.10E-01 1406600500078 23. 30. 8.51E+01 3.19E-01 1406600500079 23. 30. 8.97E+01 3.16E-01 1406600500080 23. 30. 9.48E+01 3.12E-01 1406600500081 23. 30. 1.00E+02 2.97E-01 1406600500082 23. 30. 1.04E+02 2.85E-01 1406600500083 23. 30. 1.10E+02 2.52E-01 1406600500084 23. 30. 1.20E+02 1.91E-01 1406600500085 25. 30. 6.04E+01 5.06E-01 1406600500086 25. 30. 7.02E+01 4.88E-01 1406600500087 25. 30. 7.53E+01 4.46E-01 1406600500088 25. 30. 8.01E+01 4.04E-01 1406600500089 25. 30. 8.51E+01 3.66E-01 1406600500090 25. 30. 9.01E+01 3.62E-01 1406600500091 25. 30. 9.49E+01 3.74E-01 1406600500092 25. 30. 1.00E+02 3.90E-01 1406600500093 25. 30. 1.05E+02 4.40E-01 1406600500094 25. 30. 1.10E+02 4.81E-01 1406600500095 25. 30. 1.20E+02 5.59E-01 1406600500096 ENDDATA 86 0 1406600500097 ENDSUBENT 96 0 1406600599999 SUBENT 14066006 20051216 13391406600600001 BIB 4 6 1406600600002 REACTION (98-CF-252(0,F),TER,DA/DE,A,REL) 1406600600003 Alpha angular distribution for fission-fragment 1406600600004 kinetic energy intervals 1406600600005 EN-SEC (E-MIN,FF) and (E-MAX,FF) 1406600600006 ERR-ANALYS No information 1406600600007 STATUS (CURVE) Data taken from Fig. 13 1406600600008 ENDBIB 6 0 1406600600009 NOCOMMON 0 0 1406600600010 DATA 4 46 1406600600011 E-MIN E-MAX ANG DATA 1406600600012 MEV MEV ADEG ARB-UNITS 1406600600013 160. 6.99E+01 7.62E-01 1406600600014 160. 7.49E+01 1.54E+00 1406600600015 160. 7.96E+01 2.16E+00 1406600600016 160. 8.47E+01 2.51E+00 1406600600017 160. 8.97E+01 2.50E+00 1406600600018 160. 9.47E+01 2.11E+00 1406600600019 160. 1.00E+02 1.42E+00 1406600600020 160. 1.04E+02 5.87E-01 1406600600021 160. 170. 6.01E+01 6.48E-01 1406600600022 160. 170. 6.98E+01 2.25E+00 1406600600023 160. 170. 7.47E+01 3.07E+00 1406600600024 160. 170. 7.96E+01 3.61E+00 1406600600025 160. 170. 8.47E+01 3.77E+00 1406600600026 160. 170. 8.95E+01 3.45E+00 1406600600027 160. 170. 9.45E+01 2.63E+00 1406600600028 160. 170. 9.98E+01 1.71E+00 1406600600029 160. 170. 1.05E+02 6.12E-01 1406600600030 170. 180. 5.98E+01 1.19E+00 1406600600031 170. 180. 6.93E+01 3.57E+00 1406600600032 170. 180. 7.44E+01 4.28E+00 1406600600033 170. 180. 7.94E+01 4.45E+00 1406600600034 170. 180. 8.45E+01 4.09E+00 1406600600035 170. 180. 8.97E+01 3.33E+00 1406600600036 170. 180. 9.47E+01 2.40E+00 1406600600037 170. 180. 9.98E+01 1.58E+00 1406600600038 170. 180. 1.05E+02 9.91E-01 1406600600039 170. 180. 1.10E+02 7.67E-01 1406600600040 180. 190. 6.01E+01 1.00E+00 1406600600041 180. 190. 6.98E+01 2.17E+00 1406600600042 180. 190. 7.48E+01 2.39E+00 1406600600043 180. 190. 7.97E+01 2.29E+00 1406600600044 180. 190. 8.49E+01 1.97E+00 1406600600045 180. 190. 8.98E+01 1.51E+00 1406600600046 180. 190. 9.51E+01 1.09E+00 1406600600047 180. 190. 1.00E+02 7.98E-01 1406600600048 180. 190. 1.05E+02 6.95E-01 1406600600049 190. 5.99E+01 5.85E-01 1406600600050 190. 7.02E+01 6.12E-01 1406600600051 190. 7.53E+01 5.43E-01 1406600600052 190. 8.00E+01 4.65E-01 1406600600053 190. 8.48E+01 4.03E-01 1406600600054 190. 9.00E+01 3.54E-01 1406600600055 190. 9.49E+01 3.39E-01 1406600600056 190. 1.00E+02 3.11E-01 1406600600057 190. 1.05E+02 2.87E-01 1406600600058 190. 1.10E+02 2.34E-01 1406600600059 ENDDATA 48 0 1406600600060 ENDSUBENT 59 0 1406600699999 ENDENTRY 6 0 1406699999999