ENTRY 23174 20110101 22302317400000001 SUBENT 23174001 20110101 22302317400100001 BIB 12 33 2317400100002 AUTHOR (K.Skarsvag) 2317400100003 TITLE Time distribution of gamma-rays from spontaneous 2317400100004 fission of Cf-252. 2317400100005 REFERENCE (J,NP/A,153,82,1970) Main reference. 2317400100006 INSTITUTE (2NORKJL) 2317400100007 SAMPLE Cf-252 of 5E+5 fis/min, deposited on thick Pt backing. 2317400100008 DETECTOR (SIBAR) ORTEC surface barrier detector, 8 mm diameter. 2317400100009 For FF detection. 2317400100010 (NAICR) 7.6 cm x 7.6 cm NaI(Tl) crystal on RCA 7046 2317400100011 photomultiplier. For gammas detection. 2317400100012 PART-DET (FF) 2317400100013 (G) 2317400100014 REL-REF (I,,K.Skarsvag+,J,NP,62,103,1965) 2317400100015 Details of electronic equipment. 2317400100016 METHOD (TOF) Flight path 6m, 3m, 1.5 m - geometry 1,2,3. 2317400100017 Time resolution about 6 ns FWHM. 2317400100018 At distance of 1.5 m measurements were also made with 2317400100019 lead shield between Cf source and NaI(Tl) detector - 2317400100020 geometry 4. 2317400100021 For measurement in nano and subnanosecond region - 2317400100022 recoil distance method was used - NaI(Tl) detector at 2317400100023 50 cm distance from Cf source, 40 cm long lead 2317400100024 collimator; two series of measurements were made - with2317400100025 collimator widths of about 8mm and 2 mm in geometries 52317400100026 and 6 (data set 5 and 6), respectively. 2317400100027 ANALYSIS Data were normalized to gamma-rays per prompt gamma-ray2317400100028 per channel(0.57ns) by setting the area of prompt 2317400100029 gamma-ray peak ( from -10 to 12.5 ns) to unity. 2317400100030 Data obtained with path 6m ( in range 45-120 ns) and 2317400100031 3 m ( in range 30-54 ns) were accepted for analysis 2317400100032 -data set 1 and 2, respectively. 2317400100033 CORRECTION For finite time resolution. 2317400100034 HISTORY (20120101C) M.M. 2317400100035 ENDBIB 33 0 2317400100036 NOCOMMON 0 0 2317400100037 ENDSUBENT 36 0 2317400199999 SUBENT 23174002 20110101 22302317400200001 BIB 4 9 2317400200002 REACTION (98-CF-252(0,F),,MLT,G,REL/MSC) 2317400200003 Yield of gamma-rays (%) per gamma-ray (normalized to 2317400200004 unity at time of 120 ns after fission). 2317400200005 Directly measured. 2317400200006 FLAG (1.) Time interval 45 - 120 ns, data set 1. 2317400200007 (2.) Time interval 30 - 54 ns, data set 2. 2317400200008 (3.) Time interval 0.8- 34 ns, data set 4. 2317400200009 ERR-ANALYS (DATA-ERR) Not specified. 2317400200010 STATUS (TABLE) Table 3 of J,NP/A,153,82,1970. 2317400200011 ENDBIB 9 0 2317400200012 NOCOMMON 0 0 2317400200013 DATA 3 3 2317400200014 DATA DATA-ERR FLAG 2317400200015 ARB-UNITS ARB-UNITS NO-DIM 2317400200016 0.71 0.13 1. 2317400200017 0.43 0.02 2. 2317400200018 9.3 0.3 3. 2317400200019 ENDDATA 5 0 2317400200020 ENDSUBENT 19 0 2317400299999 SUBENT 23174003 20110101 22302317400300001 BIB 5 20 2317400300002 REACTION 1(98-CF-252(0,F),,MLT,G,REL/MSC,DERIV) 2317400300003 Fit with programs A1 or A2. 2317400300004 2(98-CF-252(0,F),,MLT,G,REL/MSC,DERIV) 2317400300005 Fit 1 with program B using all data sets. 2317400300006 Yield of gamma-rays (%) per gamma-ray (normalized to 2317400300007 unity at time of 120 ns after fission). 2317400300008 ANALYSIS (LEAST) Least-squares fits to data sets were made with 2317400300009 programs A1, A2, B. 2317400300010 FLAG (1.) data set 1. 2317400300011 (2.) data set 2. 2317400300012 (3.) data set 4. 2317400300013 (4.) data set 5. 2317400300014 (5.) data set 6. 2317400300015 (6.) Time interval 45 - 120 ns. 2317400300016 (7.) Time interval 30 - 54 ns. 2317400300017 (8.) Time interval 0.8- 34 ns. 2317400300018 (9.) Time interval 0.24 - 3.7 ns 2317400300019 (10.) Time interval 0.10 - 1.3 ns, 2317400300020 ERR-ANALYS (DATA-ERR) Not specified. 2317400300021 STATUS (TABLE) Table 3 of J,NP/A,153,82,1970. 2317400300022 ENDBIB 20 0 2317400300023 NOCOMMON 0 0 2317400300024 DATA 4 5 2317400300025 DATA 1DATA 2FLAG FLAG 2317400300026 ARB-UNITS ARB-UNITS NO-DIM NO-DIM 2317400300027 0.68 0.69 1. 6. 2317400300028 0.48 0.41 2. 7. 2317400300029 9.1 9.5 3. 8. 2317400300030 9.1 10.0 4. 9. 2317400300031 13.3 12.9 5. 10. 2317400300032 ENDDATA 7 0 2317400300033 ENDSUBENT 32 0 2317400399999 SUBENT 23174004 20110101 22302317400400001 BIB 7 18 2317400400002 REACTION (98-CF-252(0,F),PAR,MLT,G) 2317400400003 Yield of gamma-rays with energies greater 100 keV, 2317400400004 per one fission. 2317400400005 EN-SEC (E-MIN,G) Minimal energy of gamma-rays. 2317400400006 ANALYSIS Defined from area of prompt gamma-ray peak in the time 2317400400007 distribution measured in geometries 1,2,3 up to time of2317400400008 120 ns after fission. 2317400400009 Attenuation of gamma-rays in air was taken into account2317400400010 by extrapolating the number of gamma-rays to zero 2317400400011 distance. 2317400400012 REL-REF (A,14314001,A.B.Smith+,J,PR,104,699,1956) 2317400400013 Data of this experiment is higher that of 2317400400014 A.Smith - 10.3 gam/fis . 2317400400015 COMMENT Of compiler M.M. There is misprint in the volume 2317400400016 number given in the article J,NP/A,153,82 references 2317400400017 list : 17) A.B.Smith+ - vol.= 104, but not 164 . 2317400400018 ERR-ANALYS (DATA-ERR) Not specified. 2317400400019 STATUS (TABLE) Text J,NP/A,153,82,1970, page 93. 2317400400020 ENDBIB 18 0 2317400400021 COMMON 1 3 2317400400022 E-MIN 2317400400023 KEV 2317400400024 100. 2317400400025 ENDCOMMON 3 0 2317400400026 DATA 2 1 2317400400027 DATA DATA-ERR 2317400400028 PRD/REAC PRD/REAC 2317400400029 11.6 1.0 2317400400030 ENDDATA 3 0 2317400400031 ENDSUBENT 30 0 2317400499999 ENDENTRY 4 0 2317499999999