ENTRY 30318 20140109 31623031800000001 SUBENT 30318001 20140109 31623031800100001 BIB 10 31 3031800100002 TITLE Investigation of prompt neutrons accompanying 3031800100003 spontaneous ternary fission of Cf-252 3031800100004 AUTHOR (H.Piekarz, J.Blocki, T.Krogulski, E.Piasecki) 3031800100005 INSTITUTE (3POLIFJ,2ZZZCER) 3031800100006 Experiment was performed at the Nuclear Chemistry 3031800100007 Group at CERN (but by the Polish group) 3031800100008 REFERENCE (J,NP/A,146,273,197005) 3031800100009 (C,69VIENNA,,892,196907) 3031800100010 No curve of ang. distribution 3031800100011 (P,INDC(POL)-2,23,1969) 3031800100012 Same as 69VIENNA but with a curve 3031800100013 EXP-YEAR (1969) 3031800100014 METHOD (PSD) Neutrons were separately detected from gamma rays3031800100015 with a pulse-shape discrimination. 3031800100016 Fast-slow coincidence technique was used for detection3031800100017 of prompt neutrons accompanying spontaneous ternary 3031800100018 fission and alpha particle. 3031800100019 DETECTOR (SCIN) Stilbene crystal 40 * 40 mm with 56 AVP photo- 3031800100020 multiplier. 3031800100021 (SIBAR) Silicon surface barrier detector for fission 3031800100022 fragments and alpha particles from tripartition. 3031800100023 PART-DET (PN,A) Prompt neutrons and alphas. 3031800100024 ERR-ANALYS (DATA-ERR) No further information. 3031800100025 HISTORY (19760107C) KO 3031800100026 (19770614A) KO. Final ref.added. standard value added 3031800100027 to subentry .004. 3031800100028 (20090115A) SD: BIB section updated. Data from fig.3 3031800100029 (subent 003) were digitized. 3031800100030 (20100322A) On. 004 updated and 005 added. 3031800100031 (20110214U) On. BIB revised 3031800100032 (20131222A) VS. 005 updated according to CP-D/820. 3031800100033 ENDBIB 31 0 3031800100034 NOCOMMON 0 0 3031800100035 ENDSUBENT 34 0 3031800199999 SUBENT 30318002 20110214 31493031800200001 BIB 4 8 3031800200002 REACTION (98-CF-252(0,F),PR,NU/DA,N+FF,REL) 3031800200003 COMMENT The angular distribution of neutrons in the binary 3031800200004 fission (FWHM = 96 deg) is quite similar with one 3031800200005 in the ternary fission (FWHM = 90 deg). 3031800200006 STATUS (TABLE) Private communication with E.Piasecki, 3031800200007 corresponding to Fig.2 of Nucl.Phys,A146(1970)273. 3031800200008 HISTORY (19751125R) 3031800200009 (20110214A) On. REACTION (SF6) corrected 3031800200010 ENDBIB 8 0 3031800200011 NOCOMMON 0 0 3031800200012 DATA 3 7 3031800200013 ANG-RL DATA DATA-ERR 3031800200014 ADEG ARB-UNITS ARB-UNITS 3031800200015 95. 0.48 0.04 3031800200016 110. 0.58 0.04 3031800200017 133. 1.13 0.04 3031800200018 154. 1.67 0.04 3031800200019 180. 2.17 0.04 3031800200020 199. 1.84 0.04 3031800200021 223. 1.29 0.04 3031800200022 ENDDATA 9 0 3031800200023 ENDSUBENT 22 0 3031800299999 SUBENT 30318003 20110214 31493031800300001 BIB 5 9 3031800300002 REACTION (98-CF-252(0,F)2-HE-4,PR/TER,NU/DA,N+FF,REL) 3031800300003 COMMENT The angular distribution of neutrons with respect to 3031800300004 the fission fragments is quite similar in the binary 3031800300005 and ternary fission. 3031800300006 ERR-ANALYS (ANG-ERR-D) Digitizing error 3031800300007 (ERR-DIG) Digitizing error 3031800300008 STATUS (CURVE) Fig.3 of Nucl.Phys.A146(1970)273. 3031800300009 HISTORY (20090115A) SD: Data from Fig.3 (subent 003) digitized 3031800300010 (20110214A) On. REACTION (SF6-SF7) corrected 3031800300011 ENDBIB 9 0 3031800300012 COMMON 2 3 3031800300013 ANG-ERR-D ERR-DIG 3031800300014 ADEG ARB-UNITS 3031800300015 0.5 0.02 3031800300016 ENDCOMMON 3 0 3031800300017 DATA 3 7 3031800300018 ANG-RL DATA DATA-ERR 3031800300019 ADEG ARB-UNITS ARB-UNITS 3031800300020 89.5 2.41 0.20 3031800300021 112.4 2.62 0.23 3031800300022 134.6 3.91 0.26 3031800300023 156.6 7.12 0.46 3031800300024 178.6 10.02 0.63 3031800300025 200.2 8.81 0.57 3031800300026 223.3 6.15 0.40 3031800300027 ENDDATA 9 0 3031800300028 ENDSUBENT 27 0 3031800399999 SUBENT 30318004 20100322 31453031800400001 BIB 6 20 3031800400002 REACTION (98-CF-252(0,F)2-HE-4,PR/TER,NU) 3031800400003 MONITOR ((MONIT)98-CF-252(0,F),PR,NU) 3031800400004 = 3.77 from Conde-during, Proc. 3031800400005 MONIT-REF ((MONIT),H.Conde+,C,65SALZBURG,2,93,1965) 3031800400006 COMMENT 1.The ratio of the number of neutrons emitted from 3031800400007 the light fragment to that emitted from the heavy 3031800400008 one is similar in the binary and ternary fission, 3031800400009 ((nu(L,B)/nu(H,B))/((nu(L,T)/nu(H,T))= 1.1 +- 0.1, 3031800400010 where L,H,B,T stand for light-,heavy-fragment,binary 3031800400011 and ternary. 3031800400012 2.Prompt neutron yield accompanying spontaneous 3031800400013 ternary fission decreases with increasing the alpha 3031800400014 energy, 3031800400015 (d-nu/d-E(alpha)) =(-0.042 +- 0.01)/MeV. 3031800400016 3.The total kinetic energy released in ternary fission3031800400017 is higher by 3.8+-1.3 MeV than that in binary 3031800400018 fission. 3031800400019 STATUS (TABLE) C,69VIENNA,,892,1969 and J,NP/A,146,273,1970 3031800400020 HISTORY (19770614A) KO.- Standard value added.- 3031800400021 (20100322A) On. MONIT-REF and SF4=2-HE-4 added 3031800400022 ENDBIB 20 0 3031800400023 NOCOMMON 0 0 3031800400024 DATA 3 1 3031800400025 DATA DATA-ERR MONIT 3031800400026 PRT/FIS PRT/FIS PRT/FIS 3031800400027 3.10 0.08 3.77 3031800400028 ENDDATA 3 0 3031800400029 ENDSUBENT 28 0 3031800499999 SUBENT 30318005 20140109 31623031800500001 BIB 3 7 3031800500002 REACTION 1(98-CF-252(0,F)2-HE-4,SEC/TER,AKE,LF) 3031800500003 2(98-CF-252(0,F)2-HE-4,SEC/TER,AKE,HF) 3031800500004 3(98-CF-252(0,F)2-HE-4,SEC/TER,AKE,LF+HF) 3031800500005 STATUS (TABLE) Table 2 of J,NP/A,146,273,1970 3031800500006 HISTORY (20100322C) On 3031800500007 (20131222A) VS. REACTION code changed 3031800500008 according to CP-D/820. 3031800500009 ENDBIB 7 0 3031800500010 NOCOMMON 0 0 3031800500011 DATA 6 1 3031800500012 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 33031800500013 MEV MEV MEV MEV MEV MEV 3031800500014 96.8 0.8 74.2 0.8 171.0 1.1 3031800500015 ENDDATA 3 0 3031800500016 ENDSUBENT 15 0 3031800599999 ENDENTRY 5 0 3031899999999