SUBENT V0012001 20210414 V039V001200100001
BIB 9 178 V001200100002
TITLE Application of nuclear reaction models for neutron V001200100003
nuclear data evaluation. statistical and optical V001200100004
model calculations for 134-138Ba V001200100005
AUTHOR (B.Strohmaier, M.Uhl, W.K.Matthes) V001200100006
INSTITUTE (2AUSIRK) V001200100007
REFERENCE (J,NSE,65,368,1978) Summary, some graphs given V001200100008
(W,STROHMAIER,197806) Numerical data + explanations V001200100009
(W,STROHMAIER,198001) Correction of part of numerical V001200100010
data (elastic+diff.elastic cs). See HISTORY for detailV001200100011
METHOD Evaluation V001200100012
ANALYSIS Data have been calculated by means of the optical and V001200100013
statistical model with consideration of preequilibriumV001200100014
emission, using a consistent set of parameters based V001200100015
as much as possible on experimental data. V001200100016
Experimental data used: V001200100017
The nuclear model parameters were adjusted not only V001200100018
to reproduce the experimental cross sections, but V001200100019
also to be consistent with other nuclear data as V001200100020
strength functions, resonance densities and level V001200100021
schemes. for nuclear reaction data, the corresponding V001200100022
references are given below under REL-REF. In several V001200100023
cases the data have been renormalized to recent valuesV001200100024
of the respective standard cross sections. V001200100025
Models and computer codes employed: V001200100026
- Total, elastic, nonelastic cross sections ... V001200100027
Single-channel optical model, code ABACUS II V001200100028
- Reactions with particles in the exit channel ... V001200100029
Statistical model comprising equilibrium and V001200100030
preequilibrium decay, code STAPRE V001200100031
- Capture cross sections ... V001200100032
Compound nucleus model, code CAPTRE V001200100033
Energy range considered: V001200100034
20 keV to 20 MeV with the following exception; V001200100035
Capture and partial inelastic scattering cross V001200100036
sections to low excited states are only given up to V001200100037
6 MeV (at most) because of the limited range of V001200100038
validity of the models employed. (for the high V001200100039
energy part of these reactions, direct-semidirect V001200100040
capture and coupled-channel optical model V001200100041
calculations by the same authors are in progress.) V001200100042
Calculation of elastic cross sections: V001200100043
Up to the energy of the highest discrete level the V001200100044
elastic cross-sections were calculated as sum of V001200100045
shape-elastic and compound-elastic contributions V001200100046
(for the differential cs, the sum and the compound- V001200100047
nucleus contribution are compiled in this entry). At V001200100048
higher energies, the compound-nucleus contribution V001200100049
was neglected. Although the overall effect is small, V001200100050
the angular distribution for the lowest energy where V001200100051
this neglect took place may be inaccurate. V001200100052
Accuracy estimates: V001200100053
Due to lack of experimental information, V001200100054
quantitative accuracy estimates could not be given V001200100055
for all reactions and energies. This concerns V001200100056
especially the isotopes 134 to 137. V001200100057
- Total, elastic, nonelastic cross sections V001200100058
Ba-138 total (0.4-15 MeV) 5% V001200100059
Nonelastic 10% V001200100060
Diff.elast. (-5 MeV) 20% V001200100061
Other isotopes are less accurate. V001200100062
- Capture cross sections V001200100063
Ba-138 Comparable to experimental errors V001200100064
Ba-135,137 50 % V001200100065
Ba-134,136 better than Ba-135,137 V001200100066
- (n,n'), (n,2n), (n,3n) cross sections V001200100067
10% in those energy regions where the main part of V001200100068
the absorption cross section falls to their share. V001200100069
- (n,p), (n,pn), (n,np) cross sections V001200100070
30 - 40% V001200100071
- Neutron emission spectra V001200100072
10 - 20% in the range of validity of the pre- V001200100073
equilibrium+equilibrium statistical model, less V001200100074
accurate for higher energies. Neutrons emitted V001200100075
after charged particle emission were neglected V001200100076
(at most 1% contribution) V001200100077
- Proton production spectra V001200100078
30 - 40% where models used are appropriate. Only V001200100079
first chance emitted protons were considered V001200100080
(sigma(n,np) is smaller by at least 2 orders of V001200100081
magnitude) V001200100082
- gamma production spectra V001200100083
No quantitative accuracy estimate given. V001200100084
Contributions of other than (n,g) and (n,xng) V001200100085
reactions were not considered since they are V001200100086
negligible. V001200100087
REL-REF Experimental works on which this evaluation is based: V001200100088
-- 1. Experimental data for determination of optical V001200100089
model parameters V001200100090
--- 1.1 Total, nonelastic and differential elastic V001200100091
cross sections (natural Ba only) V001200100092
(E,20560004,R.-D.Heuer+,J,ZP/A,275,17,1975) V001200100093
(E,10047060,D.G.Foster Jr+,J,PR/C,3,576,1971) V001200100094
(E,11320005,J.P.Conner,J,PR,109,1268,1958) V001200100095
(E,80008012,V.I.Strizhak,J,JNE,5,253,1957) V001200100096
(E,,V.I.Strizhak,J,JET,4,769,1957) V001200100097
(E,80127016,M.V.Pasechnik,C,55GENEVA,2,3,1955) V001200100098
(E,11712016,D.W.Miller+,J,PR,88,83,1952) V001200100099
(E,11056044,J.H.Coon+,J,PR,88,562,1952) V001200100100
(E,,L.Ya.Kazakova+,R,EANDC-50,200,1965) V001200100101
(E,11637055,M.Walt+,J,PR,93,1062,1954) V001200100102
(E,10332023,S.A.Cox+,R,ANL-7935,1972) V001200100103
(E,40683001,M.V.Pasechnik+,J,JNE/AB,19,278,1965) V001200100104
(E,11321009,R.W.Hill,J,PR,109,2105,1958) V001200100105
(E,11621001,L.D.Vincent+,R,WADD-TR-60-217,1960) V001200100106
(E,11511028,R.L.Becker+,J,NP,89,154,1966) V001200100107
--- 1.2 Potential scattering radius, s-and p-wave V001200100108
strength functions V001200100109
(E,,K.K.Seth+,J,PR,110,692,1958) V001200100110
(E,30328001,A.R.L.Musgrove+,J,NP/A,252,301,1975) V001200100111
(E,,E.G.Bilpuch+,J,AP,14,387,1961) V001200100112
(E,,M.S.Murty+,J,NP/A,213,35,1973) V001200100113
(E,30328001,A.R.de L.Musgrove+,J,NP/A,256,173,1976) V001200100114
(E,20469010,R.E.van de Vyver+,J,NP/A,177,393,1971) V001200100115
(E,30293003,A.R.L.Musgrove+,R,AAEC/E-327,1974) V001200100116
identical with INDC(AUL)-23 V001200100117
-- 2. Capture cross sections V001200100118
(E,80049001,Yu.Ya.Stavisskii+,J,SJA,10,498,1962) V001200100119
(E,11675016,A.E.Johnsrud+,J,PR,116,927,1959) V001200100120
(E,80133001,M.V.Pasechnik+,C,58GENEVA,15,18,1958) V001200100121
(E,80134001,A.I.Leipunsky+,C,58GENEVA,15,50,1958) V001200100122
(E,,K.Siddappa+,J,NC/A,18,48,1973) V001200100123
(E,11399034,R.L.Macklin+,J,PR,107,504,1957) V001200100124
(E,30079027,A.K.Chaubey+,J,PR,152,1055,1966) V001200100125
(E,11407024,W.S.Lyon+,J,PR,114,1619,1959) V001200100126
(E,20092012,J.Colditz+,J,OSA,105,236,1968) V001200100127
(E,,D.J.Hughes+,J,PR,91,1423,1953) V001200100128
(E,30031017,G.Peto+,J,JNE,21,797,1967) V001200100129
(E,30328001,A.R.de L.Musgrove+,J,NP/A,252,301,1975) V001200100130
values for s-and p-wave radiation widths for V001200100131
Ba-138 withdrawn by author, see EXFOR 30328.001. V001200100132
-- 3. (n,n') and (n,2n) cross sections V001200100133
(E,11720001,A.B.Tucker+,J,PR,137,B1181,1965) V001200100134
(E,30338006,P.Bornemisza+,J,AK,10,112,1968) V001200100135
(E,10486004,H.C.Kao+,J,BAP,19,700(EC7),1974) V001200100136
(E,30098002,E.Rurarz+,R,INR-1197,1970) V001200100137
(E,,P.Cuzzocrea+,J,NC/B,52,476,1967) V001200100138
(E,12033001,R.G.Wille+,J,PR,118,242,1960) V001200100139
(E,11850007,K.G.Broadhead+,J,ARI,18,279,1967) V001200100140
(E,30348001,E.Holub,J,ASL,25,180,1975) V001200100141
(E,30183003,E.Rurarz+,J,APP/B,3,637,1972) V001200100142
(E,11862003,C.P.Swann+,J,PR,100,1329,1955) V001200100143
(E,30154005,E.Rurarz+,R,INR-1197,1970) V001200100144
-- 4. (n,p) cross sections V001200100145
(E,,P.Cuzzocrea+,J,NC/B,52,476,1967) V001200100146
(E,12033001,R.G.Wille+,J,PR,118,242,1960) V001200100147
value for Ba-136 considered too high V001200100148
(E,20811012,O.Schwerer+,J,OSA,113,(9),153,1976) V001200100149
(E,10145020,W.-D.Lu+,J,PR/C,1,358,1970) V001200100150
(E,40223001,V.Levkovskii+,J,SNP,8,4,1969) V001200100151
(E,60812001,R.F.Coleman+,J,PPS,73,215,1959) V001200100152
value for Ba-136 considered too high V001200100153
(E,11274086,E.B.Paul+,J,CJP,31,267,1953) V001200100154
(E,,V.N.Levkovskii,J,SNP,18,361,1974) V001200100155
-- 5. gamma production spectra V001200100156
(E,60641001,J.L.Perkin,J,NP,60,561,1964) V001200100157
STATUS (TABLE) Data received from author V001200100158
HISTORY (19780612C) OS. V001200100159
(19800605A) OS. The following corrections were made: V001200100160
(1) Following priv.comm.by author, the following V001200100161
corrections concerning elastic, diff.compound V001200100162
elastic and diff.elastic c.s.at lower energies V001200100163
were made (Subentries 2,3,21,22,43,44,63,64,82,83)V001200100164
(a) Inconsistency between total c.s.and (elastic+ V001200100165
capture) c.s. resolved V001200100166
(b) Width fluctuation correction introduced. V001200100167
Both corrections applied up to the highest V001200100168
energy for which the Hauser-Feshbach V001200100169
contribution to the diff.elastic c.s. was V001200100170
considered. At several energies, also the V001200100171
total and the absorption c.s. were slightly V001200100172
affected. All values for 1 kev and 10 keV were V001200100173
deleted. V001200100174
(2) Single data point in subentry 55 corrected V001200100175
(3) Minor bib amendments in subentry 1. V001200100176
(19920623A) OS.- Data units added and numerical data V001200100177
formats corrected in SAN 3,22,44,64,83 V001200100178
(20110121U) On. Upper to lower cases, 4 digits year V001200100179
(20210414A) On. Major revision in 006,025,047,067,086. V001200100180
ENDBIB 178 0 V001200100181
NOCOMMON 0 0 V001200100182
ENDSUBENT 181 0 V001200199999
SUBENT V0012060 20110121 V028V001206000001
BIB 1 1 V001206000002
REACTION (56-BA-136(N,N+P)55-CS-135-M,SEQ,SIG,,,EVAL) V001206000003
ENDBIB 1 0 V001206000004
NOCOMMON 0 0 V001206000005
DATA 2 11 V001206000006
EN-CM DATA V001206000007
MEV B V001206000008
10.161 0. V001206000009
11.098 0. V001206000010
12.098 0. V001206000011
13.098 .1318E-09 V001206000012
14.098 .9392E-08 V001206000013
15.098 .1544E-06 V001206000014
16.098 .1014E-05 V001206000015
17.098 .3784E-05 V001206000016
18.098 .9678E-05 V001206000017
19.098 .1890E-04 V001206000018
20.098 .3030E-04 V001206000019
ENDDATA 13 0 V001206000020
ENDSUBENT 19 0 V001206099999