ENTRY 41694 20210319 41954169400000001
SUBENT 41694001 20210319 41954169400100001
BIB 10 61 4169400100002
AUTHOR (Yu.S.Zamyatnin,D.K.Ryazanov,B.G.Basova,A.D.Rabinovich,4169400100003
V.A.Korostylev) 4169400100004
TITLE Prompt neutrons from fission of heavy nuclei 4169400100005
REFERENCE (J,SNP,29,305,1979) Eng.trans.of J,YF,29,595,1979 4169400100006
(J,YF,29,595,1979) Figures only. 4169400100007
INSTITUTE (4RUSNIR) 4169400100008
REL-REF (I,,B.G.Basova+,J,PTE,,(4),46,1975) 4169400100009
Details of ionization chamber. 4169400100010
(N,,B.G.Basova+,P,NIIAR-127,1971) 4169400100011
Algorithm of determination of fragment mass, velocity, 4169400100012
combined kinetic energy. 4169400100013
(M,,B.G.Basova+,P,NIIAR-269,1976) 4169400100014
(M,,B.G.Basova+,P,NIIAR-262,1975) 4169400100015
D.K.Ryazanov+,P,NIIAR-P-21(287),1976 - 4169400100016
details of analysis. 4169400100017
(N,40479001,Yu.S.Zamyatnin+,J,SNP,27,31,1978) 4169400100018
Eng.trans.of J,YF,27,(1),60,1978. 4169400100019
In this experiment for Pu-239 and Cf-252 the number of4169400100020
events was more than 1.E+7, ionization chamber working4169400100021
gas Ar + 3.% of N2. 4169400100022
METHOD (COINC) Coincidence of neutrons and fission fragments 4169400100023
(TOF) For separation of neutrons from prompt gammas. 4169400100024
Flight path 40. cm. 4169400100025
Mass resolution - 4 a.m.u., 4169400100026
kinetic energy resolution - 2.5 MeV. 4169400100027
Collimating of FF by mechanical collimator ( two 4169400100028
diaphragms of aperture diameter 8 mm, located coaxially4169400100029
of sample at 5.6 mm distance). 4169400100030
Two (two-dimensional 64x64 channel) sets were obtained-4169400100031
fragment-fragment double coincidences Nf(El,Eh), 4169400100032
fragment-fragment-neutron triple coincidences Nn(El,Eh)4169400100033
Number of counts at detector location 4169400100034
0 deg 90 deg 4169400100035
Cf-252 spont.fiss. 4169400100036
Nf 7841976 11228084 4169400100037
Nn 283441 98238 4169400100038
Pu-239 therm.neutr.fis. 4169400100039
Nf 1253081 486334 4169400100040
Nn 28778 2484 4169400100041
DETECTOR (COIN,IOCH,SCIN) Double ionization chamber, filled with4169400100042
96% Ar + 4.% of N2 to measure FF kinetic energy. 4169400100043
Plastic scintillator of 175 mm diameter, 70 mm 4169400100044
thickness for neutron registration by TOF; located at 4169400100045
angles 0 and 90 degrees to the fragment emission 4169400100046
direction; covered with Pb of 10 mm thickness. 4169400100047
Neutron registration energy range is 0.4 - 10 MeV. 4169400100048
Time resolution 4 nsec. 4169400100049
CORRECTION For detectors angular resolution, dependence of 4169400100050
neutron detector efficiency from neutron energy, 4169400100051
dependence of neutron spectrum average energy from 4169400100052
fragment mass. 4169400100053
ERR-ANALYS (ERR-1) Error due to detectors angular resolution - 2% 4169400100054
(ERR-2,4.,12.) Detection efficiency 4169400100055
for Cf - 4% for 0deg, 5% for 90 deg, up to 8% for 4169400100056
Nn-evap for 90 deg calculated from the data measured 4169400100057
at 0 deg; 4169400100058
for Pu - up to ~ 12 %. 4169400100059
(DATA-ERR) Type of uncertainty is not explained in 4169400100060
article. 4169400100061
HISTORY (20200909C)M.M. 4169400100062
(20210319U) COREL was added in STATUS of Subent 002. 4169400100063
ENDBIB 61 0 4169400100064
COMMON 1 3 4169400100065
ERR-1 4169400100066
PER-CENT 4169400100067
2. 4169400100068
ENDCOMMON 3 0 4169400100069
ENDSUBENT 68 0 4169400199999
SUBENT 41694002 20210319 41954169400200001
BIB 5 15 4169400200002
REACTION (98-CF-252(0,F)MASS,PR/FRG,NU) 4169400200003
SAMPLE Cf-252 was deposited on Al(2)O(3) (60 mug/cm2) by 4169400200004
vacuum evaporation, covered with Au (30 mug/cm2). 4169400200005
Sample activity 500 fis./sec . 4169400200006
REL-REF (A,14065001,H.R.Bowman+,J,PR,129,2133,1963) 4169400200007
(A,14065001,H.R.Bowman+,J,PR,126,2120,1962) 4169400200008
(A,,J.Terrell,J,PR,113,527,1959) 4169400200009
(A,,J.Terrell,J,PR,127,880,1962) 4169400200010
(A,,J.S.Fraser+,J,ARN,16,430,1966) 4169400200011
ERR-ANALYS Quantization errors (1/2 pixel): 4169400200012
scale X - 0.083 a.m.u., scale Y - 0.0044 prt/fis. 4169400200013
STATUS (CURVE) Fig.1 of Sov.Nucl.Phys.,v.29,p.305,1979 4169400200014
(COREL,40420002) Measurement by different sample - 4169400200015
backing Al(2)O(3) (thickness 30 mug/cm**2) 4169400200016
covered by gold film (thickness 10 mug/cm**2) 4169400200017
ENDBIB 15 0 4169400200018
COMMON 2 3 4169400200019
MASS-ERR-D ERR-DIG 4169400200020
NO-DIM PRT/FIS 4169400200021
0.069 0.0038 4169400200022
ENDCOMMON 3 0 4169400200023
DATA 3 60 4169400200024
MASS DATA DATA-ERR 4169400200025
NO-DIM PRT/FIS PRT/FIS 4169400200026
80.230 0.6030 0.1406 4169400200027
81.217 0.8053 0.1230 4169400200028
82.880 0.8583 0.1230 4169400200029
84.206 0.9727 0.1318 4169400200030
85.698 1.1136 0.0791 4169400200031
87.030 1.1226 0.0967 4169400200032
88.861 1.1668 0.1142 4169400200033
90.194 1.1671 0.1054 4169400200034
91.688 1.2640 0.0703 4169400200035
93.355 1.2643 0.0615 4169400200036
94.688 1.2733 0.0527 4169400200037
96.184 1.3263 0.0527 4169400200038
97.851 1.3266 0.0615 4169400200039
99.350 1.3356 0.0439 4169400200040
100.680 1.3886 0.0440 4169400200041
102.180 1.4240 0.0439 4169400200042
103.840 1.4770 0.0527 4169400200043
105.330 1.6442 0.0352 4169400200044
106.650 1.8465 0.0439 4169400200045
108.310 2.0313 0.0528 4169400200046
109.800 2.1897 0.0352 4169400200047
111.290 2.3306 0.0528 4169400200048
112.950 2.4363 0.0527 4169400200049
114.430 2.6474 0.0439 4169400200050
115.760 2.7443 0.0615 4169400200051
117.420 2.9467 0.0527 4169400200052
118.740 3.0436 0.0703 4169400200053
120.220 3.3514 0.0791 4169400200054
121.540 3.6152 0.1142 4169400200055
123.040 3.7033 0.1055 4169400200056
124.880 3.5982 0.1318 4169400200057
126.150 1.9465 0.1318 4169400200058
127.660 1.6393 0.0967 4169400200059
129.030 1.1563 0.0703 4169400200060
130.380 0.8226 0.0527 4169400200061
131.880 0.8404 0.0527 4169400200062
133.380 0.8758 0.0528 4169400200063
136.190 1.1839 0.0439 4169400200064
137.690 1.2808 0.0439 4169400200065
139.510 1.3865 0.0527 4169400200066
140.840 1.4395 0.0615 4169400200067
142.510 1.4925 0.0527 4169400200068
143.840 1.5367 0.0527 4169400200069
145.490 1.6951 0.0527 4169400200070
146.990 1.8008 0.0615 4169400200071
148.480 1.9856 0.0615 4169400200072
149.970 2.1352 0.0527 4169400200073
151.460 2.2848 0.0703 4169400200074
152.940 2.4960 0.0967 4169400200075
154.600 2.6983 0.0879 4169400200076
155.920 2.8567 0.1143 4169400200077
157.750 3.0064 0.1054 4169400200078
159.080 2.9627 0.1318 4169400200079
160.580 3.0069 0.1669 4169400200080
162.070 3.1829 0.2109 4169400200081
163.700 3.7280 0.1933 4169400200082
165.210 3.5173 0.3075 4169400200083
166.720 3.3770 0.4393 4169400200084
168.360 3.8430 0.6151 4169400200085
170.030 3.7203 0.9577 4169400200086
ENDDATA 62 0 4169400200087
ENDSUBENT 86 0 4169400299999
SUBENT 41694003 20200909 41894169400300001
BIB 6 10 4169400300002
REACTION (94-PU-239(N,F)MASS,PR/FRG,NU,,SPA) 4169400300003
INC-SPECT Thermal neutrons . 4169400300004
SAMPLE Pu-239 was deposited electrically on a Au-covered 4169400300005
organic film 4169400300006
REL-REF (A,,B.G.Basova+,C,75KIEV,5,160,1975) 4169400300007
(A,,H.Nifenecker+,C,73ROCH,2,117,1973) 4169400300008
paper SM-174/207 4169400300009
ERR-ANALYS Quantization errors (1/2 pixel): 4169400300010
scale X - 0.077 a.m.u., scale Y - 0.0032 prt/fis. 4169400300011
STATUS (CURVE) Fig.2 of Sov.Nucl.Phys.,v.29,p.305,1979 4169400300012
ENDBIB 10 0 4169400300013
COMMON 3 3 4169400300014
EN-DUMMY MASS-ERR-D ERR-DIG 4169400300015
EV NO-DIM PRT/FIS 4169400300016
2.53E-02 0.055 0.0032 4169400300017
ENDCOMMON 3 0 4169400300018
DATA 3 62 4169400300019
MASS DATA DATA-ERR 4169400300020
NO-DIM PRT/FIS PRT/FIS 4169400300021
73.794 0.5604 0.3373 4169400300022
75.342 0.7003 0.2737 4169400300023
76.891 0.9357 0.2037 4169400300024
77.968 0.7257 0.1273 4169400300025
79.665 0.6492 0.0955 4169400300026
81.063 1.0119 0.1273 4169400300027
82.759 0.8909 0.1018 4169400300028
84.151 1.0118 0.0636 4169400300029
85.695 0.9799 0.0573 4169400300030
87.242 1.0880 0.0636 4169400300031
88.635 1.2089 0.0700 4169400300032
90.179 1.2025 0.0509 4169400300033
91.881 1.3361 0.0446 4169400300034
93.115 1.2978 0.0382 4169400300035
94.661 1.3678 0.0382 4169400300036
96.362 1.4441 0.0382 4169400300037
97.906 1.4567 0.0446 4169400300038
99.142 1.4631 0.0446 4169400300039
100.840 1.4566 4169400300040
102.230 1.5457 4169400300041
103.780 1.5138 0.0318 4169400300042
105.320 1.6156 0.0318 4169400300043
106.560 1.8128 0.0255 4169400300044
107.960 1.9591 0.0318 4169400300045
109.360 2.3664 0.0509 4169400300046
110.750 2.6145 0.0636 4169400300047
112.300 2.8245 0.1273 4169400300048
113.700 3.2190 0.2100 4169400300049
115.390 2.8116 0.3055 4169400300050
116.620 2.4488 0.2991 4169400300051
118.460 2.2578 0.2800 4169400300052
119.710 2.4933 0.4137 4169400300053
121.240 1.8950 0.3373 4169400300054
122.930 1.8949 0.3309 4169400300055
124.320 1.6976 0.2991 4169400300056
126.000 0.7047 0.1209 4169400300057
127.540 0.5774 0.0955 4169400300058
129.230 0.3736 0.0636 4169400300059
130.310 0.4245 0.0509 4169400300060
132.010 0.3799 0.0446 4169400300061
133.410 0.5389 0.0446 4169400300062
134.950 0.7489 0.0573 4169400300063
136.350 1.0607 0.0255 4169400300064
137.900 1.2197 0.0382 4169400300065
139.450 1.3469 0.0318 4169400300066
141.150 1.3787 0.0318 4169400300067
142.540 1.4996 0.0318 4169400300068
144.240 1.5695 0.0318 4169400300069
145.480 1.6967 0.0382 4169400300070
147.180 1.8940 0.0318 4169400300071
148.570 1.9321 0.0573 4169400300072
150.120 1.9766 0.0827 4169400300073
151.810 1.9001 0.0827 4169400300074
153.060 2.2947 0.1464 4169400300075
154.610 2.5555 0.1527 4169400300076
156.150 2.5809 0.1655 4169400300077
157.710 2.8673 0.2673 4169400300078
159.090 2.7845 0.3437 4169400300079
160.940 2.4726 0.3437 4169400300080
162.030 2.7844 0.4773 4169400300081
163.880 2.8925 0.5473 4169400300082
165.430 3.2043 0.5919 4169400300083
ENDDATA 64 0 4169400300084
ENDSUBENT 83 0 4169400399999
SUBENT 41694004 20200909 41894169400400001
BIB 6 9 4169400400002
REACTION (94-PU-239(N,F)MASS,PR,NU,,SPA) 4169400400003
INC-SPECT Thermal neutrons . 4169400400004
SAMPLE Pu-239 was deposited electrically on a Au-covered 4169400400005
organic film 4169400400006
REL-REF (A,,H.Nifenecker+,C,73ROCH,2,117,1973) 4169400400007
paper SM-174/207 4169400400008
ERR-ANALYS Quantization errors (1/2 pixel): 4169400400009
scale X - 0.077 a.m.u., scale Y - 0.021 prt/fis. 4169400400010
STATUS (CURVE) Fig.2 of Sov.Nucl.Phys.,v.29,p.305,1979 4169400400011
ENDBIB 9 0 4169400400012
COMMON 3 3 4169400400013
EN-DUMMY MASS-ERR-D ERR-DIG 4169400400014
EV NO-DIM PRT/FIS 4169400400015
2.53E-02 0.063 0.017 4169400400016
ENDCOMMON 3 0 4169400400017
DATA 3 30 4169400400018
MASS DATA DATA-ERR 4169400400019
NO-DIM PRT/FIS PRT/FIS 4169400400020
118.86 4.585 0.497 4169400400021
120.56 4.295 0.539 4169400400022
122.26 4.751 0.331 4169400400023
123.49 5.538 0.290 4169400400024
125.50 4.709 0.290 4169400400025
126.74 4.295 4169400400026
128.13 3.715 4169400400027
129.36 2.970 4169400400028
130.91 2.514 4169400400029
132.30 2.224 4169400400030
135.54 2.390 4169400400031
137.08 2.639 4169400400032
138.63 2.763 4169400400033
140.33 2.846 4169400400034
141.72 3.012 4169400400035
143.42 3.012 4169400400036
144.96 3.053 4169400400037
146.19 3.302 4169400400038
147.58 3.302 4169400400039
149.44 3.178 4169400400040
151.14 3.054 4169400400041
152.53 3.592 4169400400042
153.92 3.758 4169400400043
155.46 3.841 4169400400044
156.85 4.090 0.456 4169400400045
158.55 3.344 4169400400046
160.40 3.303 0.539 4169400400047
161.64 4.090 4169400400048
163.18 4.421 4169400400049
164.73 4.256 0.994 4169400400050
ENDDATA 32 0 4169400400051
ENDSUBENT 50 0 4169400499999
SUBENT 41694005 20200909 41894169400500001
BIB 6 27 4169400500002
REACTION 1(98-CF-252(0,F),PR,NU/TKE,,MSC,DERIV) 4169400500003
Fig.5b - NUevap - neutrons from completely accelerated 4169400500004
fragments ( part of total prompt neutrons) 4169400500005
2(98-CF-252(0,F),PR,NU/TKE,,MSC,DERIV) 4169400500006
Fig.5c - scission neutrons. 4169400500007
. Dependence from kinetic energy of fission fragments. 4169400500008
SAMPLE Cf-252 was deposited on Al(2)O(3) (60 mug/cm2) by 4169400500009
vacuum evaporation, covered with Au (30 mug/cm2). 4169400500010
Sample activity 500 fis./sec . 4169400500011
ANALYSIS It was assumed : 4169400500012
- at 0 deg - neutrons evaporated from fully accelerated4169400500013
fragments (evaporated neutrons), corresponding to 4169400500014
time > 5.E-21 sec; contribution of scission neutrons 4169400500015
is small. 4169400500016
- at 90 deg - there are evaporated neutrons and 4169400500017
neutrons emitted before complete acceleration of 4169400500018
fragments. 4169400500019
- spectrum of scission neutrons is Maxwellian with 4169400500020
average energy 2.5 MeV, angular distribution is 4169400500021
isotropic. 4169400500022
2 See formula (4) for derived yield of scission neutrons4169400500023
MISC-COL (MISC) Fig5a - ratio at 90 deg Nexperimental/Nevapor. 4169400500024
ERR-ANALYS Quantization errors (1/2 pixel): 4169400500025
Fig.1b: scale X - 0.083 MeV, scale Y - 0.017 prt/fis; 4169400500026
Fig.1c: scale X - 0.083 MeV, scale Y - 0.0034 prt/fis; 4169400500027
(ERR-S) Statistical error 4169400500028
STATUS (CURVE) Fig.5 of Sov.Nucl.Phys.,v.29,p.305,1979 4169400500029
ENDBIB 27 0 4169400500030
COMMON 3 3 4169400500031
E-ERR-DIG 1ERR-DIG 1ERR-DIG 2 4169400500032
MEV PRT/FIS PRT/FIS 4169400500033
0.068 0.0093 0.0026 4169400500034
ENDCOMMON 3 0 4169400500035
DATA 6 26 4169400500036
TKE DATA 1DATA-ERR 1DATA 2ERR-S MISC 4169400500037
MEV PRT/FIS PRT/FIS PRT/FIS PRT/FIS NO-DIM 4169400500038
155.01 5.7131 0.2985 0.3228 0.2115 4169400500039
157.40 5.7076 0.2671 0.2113 1.0796 4169400500040
159.95 5.5693 0.0544 0.1229 1.0153 4169400500041
162.41 5.5306 -0.0899 0.0955 0.9677 4169400500042
165.16 5.4248 -0.0708 0.0682 0.9671 4169400500043
167.65 5.3529 0.0372 0.0613 1.0069 4169400500044
170.06 5.1482 0.0155 0.0682 0.9997 4169400500045
172.50 4.9767 0.1712 0.0477 1.0429 4169400500046
175.09 4.7716 0.2313 0.0409 1.0491 4169400500047
177.51 4.5004 0.2574 0.0409 1.0721 4169400500048
180.21 4.1621 0.3175 0.0409 1.1287 4169400500049
182.42 3.9585 0.3435 0.0477 1.1551 4169400500050
185.01 3.6534 0.3833 0.0477 1.1949 4169400500051
187.44 3.5819 0.4639 0.0477 1.2179 4169400500052
189.97 3.4104 0.4558 0.0546 1.2409 4169400500053
192.45 3.2056 0.4955 0.0409 1.2505 4169400500054
194.87 3.0016 0.4943 0.0545 1.2768 4169400500055
197.45 2.7958 0.5340 0.0818 1.2931 4169400500056
199.76 2.6582 0.5397 0.0886 1.2893 4169400500057
202.46 2.4860 0.5930 0.0954 1.3324 4169400500058
204.84 2.2820 0.6735 0.1569 1.3655 4169400500059
207.20 2.1101 0.6383 0.2113 1.3819 4169400500060
209.82 2.0050 0.3650 0.5757 0.2454 1.2738 4169400500061
212.41 1.9656 0.5314 0.4858 0.2659 1.3943 4169400500062
214.81 0.6687 0.2455 1.3467 4169400500063
217.28 0.5585 0.2726 1.4167 4169400500064
ENDDATA 28 0 4169400500065
ENDSUBENT 64 0 4169400599999
SUBENT 41694006 20200909 41894169400600001
BIB 7 27 4169400600002
REACTION 1(94-PU-239(N,F),PR,NU/TKE,,SPA/MSC,DERIV) 4169400600003
Fig.7b - NUevap - neutrons from completely accelerated 4169400600004
fragments ( part of total prompt neutrons) 4169400600005
2(94-PU-239(N,F),PR,NU/TKE,,SPA/MSC,DERIV) 4169400600006
Fig.7c - scission neutrons. 4169400600007
. Dependence from kinetic energy of fission fragments. 4169400600008
INC-SPECT Thermal neutrons . 4169400600009
SAMPLE Pu-239 was deposited electrically on a Au-covered 4169400600010
organic film 4169400600011
ANALYSIS It was assumed : 4169400600012
- at 0 deg - neutrons evaporated from fully accelerated4169400600013
fragments (evaporated neutrons), corresponding to 4169400600014
time > 5.E-21 sec; contribution of scission neutrons 4169400600015
is small. 4169400600016
- at 90 deg - there are evaporated neutrons and 4169400600017
neutrons emitted before complete acceleration of 4169400600018
fragments. 4169400600019
- spectrum of scission neutrons is Maxwellian with 4169400600020
average energy 2.5 MeV, angular distribution is 4169400600021
isotropic. 4169400600022
2 See formula (4) for derived yield of scission neutrons4169400600023
MISC-COL (MISC) Fig.7a - ratio at 90 deg Nexperimental/Nevapor. 4169400600024
ERR-ANALYS Quantization errors (1/2 pixel): 4169400600025
Fig.1b: scale X - 0.069 MeV, scale Y - 0.014 prt/fis; 4169400600026
Fig.1c: scale X - 0.069 MeV, scale Y - 0.003 prt/fis; 4169400600027
(ERR-S) Statistical error 4169400600028
STATUS (CURVE) Fig.7 of Sov.Nucl.Phys.,v.29,p.305,1979 4169400600029
ENDBIB 27 0 4169400600030
COMMON 4 3 4169400600031
EN-DUMMY E-ERR-DIG 1ERR-DIG 1ERR-DIG 2 4169400600032
EV MEV PRT/FIS PRT/FIS 4169400600033
2.53E-02 0.056 0.011 0.023 4169400600034
ENDCOMMON 3 0 4169400600035
DATA 6 23 4169400600036
TKE DATA 1DATA-ERR 1DATA 2ERR-S MISC 4169400600037
MEV PRT/FIS PRT/FIS PRT/FIS PRT/FIS NO-DIM 4169400600038
147.84 5.457 0.369 4169400600039
150.45 5.231 0.255 4169400600040
152.93 4.834 4169400600041
155.40 4.863 4169400600042
158.01 4.580 4169400600043
160.48 4.297 4169400600044
162.96 4.071 4169400600045
165.33 3.760 0.192 0.102 1.0971 4169400600046
167.90 3.477 0.095 0.057 1.0517 4169400600047
170.24 3.251 0.152 0.057 1.0601 4169400600048
172.67 2.911 0.379 0.096 1.1366 4169400600049
175.23 2.855 0.487 0.102 1.1932 4169400600050
177.66 2.628 0.590 0.085 1.2527 4169400600051
180.14 2.431 0.397 0.085 1.1675 4169400600052
182.52 2.119 0.647 0.182 1.2837 4169400600053
185.09 1.865 0.647 0.193 1.2921 4169400600054
187.70 1.639 0.517 0.119 1.2608 4169400600055
190.45 1.497 4169400600056
192.92 1.328 4169400600057
195.39 0.960 4169400600058
198.00 1.046 4169400600059
200.34 0.677 0.255 4169400600060
202.95 0.366 0.312 4169400600061
ENDDATA 25 0 4169400600062
ENDSUBENT 61 0 4169400699999
ENDENTRY 6 0 4169499999999