ENTRY 23099 20220208 23102309900000001 SUBENT 23099001 20220208 23102309900100001 BIB 9 55 2309900100002 TITLE He-5, He-7, and Li-8(E*=2.26 MeV) intermediate ternary2309900100003 particles in the spontaneous fission of Cf-252 2309900100004 AUTHOR (Yu.N.Kopatch, M.Mutterer, D.Schwalm, P.Thirolf, 2309900100005 F.Goennenwein) 2309900100006 REFERENCE (J,PR/C,65,044614,2002) Main reference. 2309900100007 (C,99ST.AND,,316,1999) presentation on the Conf. 2309900100008 INSTITUTE (2GERTHD) Yu.N.Kopatch, M.Mutterer 2309900100009 (4ZZZDUB) Yu.N.Kopatch 2309900100010 (2GERMPH) D.Schwalm, P.Thirolf 2309900100011 (2GERTUE) F.Goennenwein 2309900100012 DETECTOR (TELES,NAICR) Darmstadt-Heidelberg Crystal Ball 2309900100013 spectrometer as homogeneous and highly granulated 4PI 2309900100014 neutron detector, combined with an efficient detection 2309900100015 system for fission fragments and ternary particles. 2309900100016 Crystal ball (CB) is dense spherical package of 162 2309900100017 NaI(Tl) crystals of 20 cm long, of high gamma-ray 2309900100018 detection efficiency (>90%). Simultaneously 2309900100019 to gamma-rays, the CB registers neutrons from fission 2309900100020 with a efficiency of about 60% for En>= 2MeV, dropping 2309900100021 down to about 50% for En below 0.5 MeV. 2309900100022 Inside the CB a spherical space of 50 cm diameter 2309900100023 the assembly of particle detectors was mounted in 2309900100024 CH4-filled spherical aluminum vessel, contained the 2309900100025 Cf-252 sample located at the center. 2309900100026 (SPEC,IOCH) Kinematic spectrometer CODIS consists of 2309900100027 Frisch-gridded 4-pi twin ionization chamber IC for 2309900100028 measuring fission-fragment energies and emission angles2309900100029 and of a ring of 12 deltaE-E telescopes made from 2309900100030 deltaE IC and silicon p-i-n diodes, with a solid 2309900100031 angle of pi/4, surrounding one half of the fragment IC 2309900100032 for measuring the LCPs. Angular resolutions FWHM =<5deg2309900100033 for both the fragments and LCPs. 2309900100034 SAMPLE Cf-252 sample of 4.x 10**3 fissions/s on thin backing. 2309900100035 METHOD (TOF) Gamma-rays were separated from the neutrons by 2309900100036 time-of-flight measurement from the Cf-252 sample to 2309900100037 the crystals -distance 25 cm. 2309900100038 (COINC) Coincidences between the ternary particles, 2309900100039 fission fragments, and neutrons and gamma-rays. 2309900100040 Simultaneously to TF events, 7.x 10**7 binary fissions 2309900100041 were recorded, the data acquisition rate for this event2309900100042 type being reduced by a factor of 1/64. 2309900100043 (PHD) Calibration of the CB pulse-height spectra in 2309900100044 terms of gamma-energy was performed with various 2309900100045 gamma-ray sources, following standard procedures. 2309900100046 Threshold corresponding to 100 keV gamma-energy was set2309900100047 in all the pulse-height spectra. 2309900100048 CORRECTION For detector efficiency. 2309900100049 For energy loss in absorber foil and the fission 2309900100050 chamber 2309900100051 HISTORY (20101012C) M.M. 2309900100052 (20130203U) SD: Author's name corrected 2309900100053 (Kopach -> Kopatch) 2309900100054 (20131215A) SD: SF5 in REACTION code in Sub.2 corrected2309900100055 Ref. on NP/A,738,122 deleted (review, no new data) 2309900100056 (20220208U) SD: Ref. 99ST.AND,,316 added. 2309900100057 ENDBIB 55 0 2309900100058 NOCOMMON 0 0 2309900100059 ENDSUBENT 58 0 2309900199999 SUBENT 23099002 20131215 22382309900200001 BIB 8 38 2309900200002 REACTION 1((98-CF-252(0,F)ELEM/MASS,TER,FY)/ 2309900200003 (98-CF-252(0,F)2-HE-4,TER,FY)) 2309900200004 Yield of LCP normalized to 10**4 LRAs. 2309900200005 2(98-CF-252(0,F)ELEM/MASS,TER,KE) 2309900200006 Average kinetic energy of LCP. 2309900200007 3(98-CF-252(0,F)ELEM/MASS,PR/TER,NU) 2309900200008 Neutron multiplicity in coincidence with given LCP. 2309900200009 MISC-COL (MISC1) FWHM of energy distribution of LCP. 2309900200010 (MISC2) Average angle of LCP with respect to LF. 2309900200011 (MISC3) FWHM of angular distribution of LCP. 2309900200012 METHOD (FISCT) Number of registered events E-threshold,MeV 2309900200013 H-3 5.6 x 10**4 3. 2309900200014 He-4 1.3 x 10**6 8. 2309900200015 He-6 2.6 x 10**4 10. 2309900200016 Li 2.5 x 10**3 17. 2309900200017 Number of registered binary events 0.7 x 10**8. 2309900200018 ANALYSIS Li yield was obtained from Gaussian fit to measured 2309900200019 energy spectrum with fixed E-LCP = 14.3+-1.0 MeV and 2309900200020 FWHM=14.3+-1.0 MeV from C.Wagemans, in Particle 2309900200021 Emission from Nuclei, edited by D.N.Poenaru+,CRC Press,2309900200022 Boca Raton,1989, chapter 3. 2309900200023 For the H-3 spectrum there is also an upper limit of 2309900200024 11.5 MeV for full energy registration due to the 2309900200025 limited thickness of the silicon detectors. 2309900200026 ADD-RES (E-DIS) Energy and angular LCP spectra are given on 2309900200027 (ANGD) Fig.3 of J,PR/C,65,044614,2002 as counts. 2309900200028 (N-SPC)Neutron angular distributions measured in 2309900200029 coincidence with LCP, (projections on zx and xy planes)2309900200030 are given on Figs.5,6 of J,PR/C,65,044614,2002 as 2309900200031 counts. 2309900200032 STATUS (TABLE) Table I of J,PR/C,65,044614,2002. 2309900200033 ERR-ANALYS (ERR-SYS) Systematic error. Include the uncertainty in 2309900200034 the procedure for the background correction and a 2309900200035 possible difference in detection efficiency for the LCP2309900200036 and fission neutrons. 2309900200037 (ERR-S) Statistical error. 2309900200038 HISTORY (20131215A) SD: SF5=PRE -> TER in REACTION (1) code; 2309900200039 SF5=TER in REACTION (2); SF5=PR/TER in REACTOIN (3). 2309900200040 ENDBIB 38 0 2309900200041 NOCOMMON 0 0 2309900200042 DATA 11 4 2309900200043 ELEMENT MASS DATA 1DATA-ERR 1DATA 2DATA-ERR 22309900200044 DATA 3MISC1 MISC1-ERR MISC2 MISC3 2309900200045 NO-DIM NO-DIM NO-DIM NO-DIM MEV MEV 2309900200046 PRT/FIS MEV MEV ADEG ADEG 2309900200047 1. 3. 9.50E-2 0.90E-2 2309900200048 2.9 84.5 33.6 2309900200049 2. 4. 1. 15.7 0.2 2309900200050 3.1 10.9 0.2 84.1 21.7 2309900200051 2. 6. 2.70E-2 0.30E-2 12.3 0.5 2309900200052 2.8 9.01 0.5 83.8 19.4 2309900200053 3. 0.60E-2 0.10E-2 2309900200054 2.2 84.9 19.0 2309900200055 ENDDATA 12 0 2309900200056 ENDSUBENT 55 0 2309900299999 SUBENT 23099003 20101012 22232309900300001 BIB 6 27 2309900300002 REACTION 1(98-CF-252(0,F)2-HE-5,TER,KE) 2309900300003 Average kinetic energy of LCP. 2309900300004 2((98-CF-252(0,F)2-HE-5,TER,FY)/ 2309900300005 (98-CF-252(0,F)2-HE-4,TER,FY)) 2309900300006 Relative to true ternary He-4 . 2309900300007 3((98-CF-252(0,F)2-HE-5,TER,FY)/ 2309900300008 (98-CF-252(0,F)2-HE-4,PRE,FY)) 2309900300009 Relative to all ternary He-4 (including residues). 2309900300010 4(98-CF-252(0,F)2-HE-7,,KE,N) 2309900300011 Average energy of associated neutrons of the 2309900300012 intermediate He-5 ternary fission mode. 2309900300013 Compiled as KE according to N.Otsuka (NDS,IAEA)comment.2309900300014 METHOD (FISCT) Number of registered events for He-5 - 2309900300015 (2.3+-0.5)*10**5 . 2309900300016 ANALYSIS 4Average neutron energy was derived from the trajectory 2309900300017 calculations. 2309900300018 MISC-COL (MISC1) FWHM of energy distribution of LCP. 2309900300019 (MISC2) Average angle of LCP with respect to LF. 2309900300020 (MISC3) FWHM of angular distribution of LCP. 2309900300021 (MISC4) Maximal energy of neutrons in coincidence with 2309900300022 given LCP. 2309900300023 STATUS (TABLE) Table III of J,PR/C,65,044614,2002. 2309900300024 ERR-ANALYS (ERR-SYS) Systematic error. Include the uncertainty in 2309900300025 the procedure for the background correction and a 2309900300026 possible difference in detection efficiency for the LCP2309900300027 and fission neutrons. 2309900300028 (ERR-S) Statistical error. 2309900300029 ENDBIB 27 0 2309900300030 COMMON 1 3 2309900300031 ERR-S 2309900300032 PER-CENT 2309900300033 0.5 2309900300034 ENDCOMMON 3 0 2309900300035 DATA 12 1 2309900300036 DATA 1ERR-SYS 1DATA 2ERR-SYS 2DATA 3ERR-SYS 32309900300037 DATA 4MISC1 MISC1-ERR MISC2 MISC3 MISC4 2309900300038 MEV MEV NO-DIM NO-DIM NO-DIM NO-DIM 2309900300039 MEV MEV MEV ADEG ADEG MEV 2309900300040 12.4 0.3 0.21 0.05 0.17 0.04 2309900300041 1.2 8.9 0.5 83.6 22.6 4.9 2309900300042 ENDDATA 6 0 2309900300043 ENDSUBENT 42 0 2309900399999 SUBENT 23099004 20101012 22232309900400001 BIB 5 21 2309900400002 REACTION 1(98-CF-252(0,F)2-HE-7,TER,KE) 2309900400003 Average kinetic energy of LCP. 2309900400004 2((98-CF-252(0,F)2-HE-7,TER,FY)/ 2309900400005 (98-CF-252(0,F)2-HE-6,TER,FY)) 2309900400006 Relative to true ternary He-6 . 2309900400007 3((98-CF-252(0,F)2-HE-7,TER,FY)/ 2309900400008 (98-CF-252(0,F)2-HE-6,PRE,FY)) 2309900400009 Relative to all ternary He-6 (including residues). 2309900400010 4(98-CF-252(0,F)2-HE-7,,KE,N) 2309900400011 Average energy of associated neutrons of the 2309900400012 intermediate He-5 ternary fission mode. 2309900400013 Compiled as KE according to N.Otsuka (NDS,IAEA)comment.2309900400014 ANALYSIS 4Average neutron energy was derived from the trajectory 2309900400015 calculations. 2309900400016 MISC-COL (MISC1) FWHM of energy distribution of LCP. 2309900400017 (MISC2) Average angle of LCP with respect to LF. 2309900400018 (MISC3) FWHM of angular distribution of LCP. 2309900400019 (MISC4) Maximal energy of neutrons in coincidence with 2309900400020 given LCP. 2309900400021 STATUS (TABLE) Table III of J,PR/C,65,044614,2002. 2309900400022 ERR-ANALYS (DATA-ERR) Not specified. 2309900400023 ENDBIB 21 0 2309900400024 COMMON 1 3 2309900400025 ERR-S 2309900400026 PER-CENT 2309900400027 4. 2309900400028 ENDCOMMON 3 0 2309900400029 DATA 12 1 2309900400030 DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3DATA-ERR 32309900400031 DATA 4MISC1 MISC1-ERR MISC2 MISC3 MISC4 2309900400032 MEV MEV NO-DIM NO-DIM NO-DIM NO-DIM 2309900400033 MEV MEV MEV ADEG ADEG MEV 2309900400034 11.0 1.5 0.21 0.05 0.17 0.04 2309900400035 1.0 8. 2. 84.0 18.2 2.3 2309900400036 ENDDATA 6 0 2309900400037 ENDSUBENT 36 0 2309900499999 SUBENT 23099005 20101012 22232309900500001 BIB 6 15 2309900500002 REACTION 1((98-CF-252(0,F)3-LI-8,TER/PAR,FY)// 2309900500003 (98-CF-252(0,F)3-LI-8,TER/PAR,FY)) 2309900500004 Li-8* yield relative to the yield of stable Li-8. 2309900500005 2(98-CF-252(0,F)3-LI-8,TER/PAR,KE,N) 2309900500006 Average energy of associated neutrons of the 2309900500007 intermediate Li-8* ternary fission mode. 2309900500008 EN-SEC 1(E-LVL-NM,3-LI-8) 2309900500009 (E-LVL-DN,3-LI-8) 2309900500010 2(E-LVL,3-LI-8) 2309900500011 ANALYSIS 2Average neutron energy was derived from the trajectory 2309900500012 calculations. 2309900500013 MISC-COL (MISC1) Maximal energy of neutrons in coincidence with 2309900500014 given LCP. 2309900500015 STATUS (TABLE) Table III of J,PR/C,65,044614,2002. 2309900500016 ERR-ANALYS (DATA-ERR) Not specified. 2309900500017 ENDBIB 15 0 2309900500018 COMMON 4 3 2309900500019 E-LVL-NM 1E-LVL-DN 1E-LVL-DN 1E-LVL 2 2309900500020 MEV MEV MEV MEV 2309900500021 2.26 0. 0.98 2.26 2309900500022 ENDCOMMON 3 0 2309900500023 DATA 4 1 2309900500024 DATA 1DATA-ERR 1DATA 2MISC1 2309900500025 NO-DIM NO-DIM MEV MEV 2309900500026 0.33 0.20 1.6 2.5 2309900500027 ENDDATA 3 0 2309900500028 ENDSUBENT 27 0 2309900599999 SUBENT 23099006 20101012 22232309900600001 BIB 5 12 2309900600002 REACTION 1(98-CF-252(0,F)2-HE-4,TER,KE) 2309900600003 2(98-CF-252(0,F)2-HE-6,TER,KE) 2309900600004 Average kinetic energy of true LCPs. 2309900600005 ANALYSIS The results on the He-5/He-4 and He-7/He-6 ratios were 2309900600006 used as input parameters for performing a least-square 2309900600007 fit with Gaussians for each of the two components - 2309900600008 for true and residue particles. 2309900600009 MISC-COL (MISC) FWHM of energy distribution of LCP. 2309900600010 STATUS (TABLE) Table IV of J,PR/C,65,044614,2002. 2309900600011 1(DEP,23099003) See ANALYSIS. 2309900600012 2(DEP,23099004) See ANALYSIS. 2309900600013 ERR-ANALYS (DATA-ERR) Not specified. 2309900600014 ENDBIB 12 0 2309900600015 NOCOMMON 0 0 2309900600016 DATA 8 1 2309900600017 DATA 1DATA-ERR 1MISC 1MISC-ERR 1DATA 2DATA-ERR 22309900600018 MISC 2MISC-ERR 2 2309900600019 MEV MEV MEV MEV MEV MEV 2309900600020 MEV MEV 2309900600021 16.4 0.3 10.3 0.3 12.6 0.5 2309900600022 8.9 0.5 2309900600023 ENDDATA 6 0 2309900600024 ENDSUBENT 23 0 2309900699999 ENDENTRY 6 0 2309999999999