ENTRY M0313 20180216 M095M031300000001 SUBENT M0313001 20180216 M095M031300100001 BIB 14 42 M031300100002 TITLE Energy spectrum of photoneutrons from gold. M031300100003 AUTHOR (R.F.Askew,A.P.Batson) M031300100004 REFERENCE (J,NP,20,408,1960) M031300100005 INSTITUTE (1USAVIR) M031300100006 FACILITY (SYNCH,1USAVIR) M031300100007 INC-SOURCE (BRST) M031300100008 SAMPLE A gold cylinder of diameter 1.232cm and height M031300100009 1.257cm. M031300100010 METHOD (REC) M031300100011 DETECTOR (PLATE) 200 mum thick Ilford C-2 emulsion. The plane M031300100012 of each emulsion was vertical and made an angle of M031300100013 5.degr. to the line joining the centres of the M031300100014 target and the emulsion. Lead shields 0.32 cm thick M031300100015 were placed over each emulsion to screen it from low M031300100016 energy photons from the target. M031300100017 CORRECTION The data were corrected for: M031300100018 (a) the shrinkage of the emulsion, M031300100019 (b) the tracks which leave the emulsion, M031300100020 (c) the attenuation of neutrons in the gold target M031300100021 and the lead shield round the emulsion, M031300100022 (d) the variation of the n-p scattering cross M031300100023 section with neutron energy. M031300100024 ERR-ANALYS (ERR-S) Statistical errors are presented. M031300100025 (ERR-1) The error involved in normalising the fast M031300100026 and slow scan, which is 7.5% . M031300100027 ADD-RES (COMP) The experimental spectrum is compared with the M031300100028 energy distribution calculated on the basis of the M031300100029 evaporation model. M031300100030 A new method for the calculation of the corrections M031300100031 involved for those proton recoils which leave the M031300100032 emulsion is presented. M031300100033 COMMENT The spectrum shows two peaks. The large peak at 1.25 M031300100034 MeV can be interpreted as due to the statistical M031300100035 decay of the compound nucleus. The smaller peak at M031300100036 about 5.5 MeV is assumed to came from a direct M031300100037 transition, as described by the Wilkinson model. M031300100038 HISTORY (19881227C) Data were compiled in SCJAD of Saratov M031300100039 State University. M031300100040 (19910202A) Corrected by V.Varlamov, V.Mclane. M031300100041 (20180216A) Corrected by SD and VV: Updated to new M031300100042 date formats, lower case, PART-DET deleted, STATUS M031300100043 moved to SUBENTs 002 - 005, REACTION, BIB update. M031300100044 ENDBIB 42 0 M031300100045 COMMON 4 3 M031300100046 EN-MAX ANG E-ERR ERR-1 M031300100047 MEV ADEG MEV PER-CENT M031300100048 55.0 90.0 0.5 7.5 M031300100049 ENDCOMMON 3 0 M031300100050 ENDSUBENT 49 0 M031300199999 SUBENT M0313002 20180216 M095M031300200001 BIB 3 4 M031300200002 REACTION (79-AU-197(G,X)0-NN-1,,DA/DE,,BRA/REL) M031300200003 STATUS (TABLE) Data from Table. 2 of Nucl.Phys.20(1960)408. M031300200004 HISTORY (20180216A) Corrected by SD and VV: STATUS, REACTION: M031300200005 BRS -> BRA. M031300200006 ENDBIB 4 0 M031300200007 NOCOMMON 0 0 M031300200008 DATA 3 20 M031300200009 E DATA ERR-S M031300200010 MEV ARB-UNITS PER-CENT M031300200011 0.75 1306.0 3.1 M031300200012 1.25 1386.0 3.5 M031300200013 1.75 1137.0 4.3 M031300200014 2.25 849.0 5.5 M031300200015 2.75 590.0 7.1 M031300200016 3.25 411.0 9.2 M031300200017 3.75 278.0 11.8 M031300200018 4.25 218.0 6.3 M031300200019 4.75 168.0 7.3 M031300200020 5.25 150.0 7.8 M031300200021 5.75 139.0 8.7 M031300200022 6.25 113.0 10.1 M031300200023 6.75 79.0 12.3 M031300200024 7.25 72.0 13.3 M031300200025 7.75 60.0 15.3 M031300200026 8.25 51.0 17.1 M031300200027 8.75 51.0 18.3 M031300200028 9.25 31.0 24.6 M031300200029 9.75 13.0 38.5 M031300200030 10.25 19.0 34.2 M031300200031 ENDDATA 22 0 M031300200032 ENDSUBENT 31 0 M031300299999 SUBENT M0313003 20180216 M095M031300300001 BIB 5 11 M031300300002 REACTION (79-AU-197(G,X)0-NN-1,DI,DA/DE,,BRA/REL) M031300300003 energy spectrum of direct neutrons M031300300004 ANALYSIS The data are difference between the experimental M031300300005 spectrum and the evaporation curve fitted to the low M031300300006 energy experimental data. M031300300007 COMMENT 12.4% of the neutrons are produced by a direct M031300300008 process. M031300300009 STATUS (DEP,M0313002) M031300300010 (CURVE) Data from Fig. 2 of Nucl.Phys.20(1960)408. M031300300011 HISTORY (20180216A) Corrected by SD and VV: STATUS, REACTION: M031300300012 BRS -> BRA. M031300300013 ENDBIB 11 0 M031300300014 NOCOMMON 0 0 M031300300015 DATA 3 18 M031300300016 E DATA ERR-S M031300300017 MEV ARB-UNITS ARB-UNITS M031300300018 0.75 0.35 4.08 M031300300019 2.25 1.35 4.81 M031300300020 2.75 1.61 4.24 M031300300021 3.25 3.61 3.78 M031300300022 3.75 3.99 3.26 M031300300023 4.25 7.13 1.38 M031300300024 4.75 7.92 1.28 M031300300025 5.25 9.40 1.22 M031300300026 5.75 10.45 1.20 M031300300027 6.25 9.28 1.22 M031300300028 6.75 6.71 1.00 M031300300029 7.25 6.37 0.99 M031300300030 7.75 5.57 0.97 M031300300031 8.25 4.84 0.89 M031300300032 8.75 4.94 0.90 M031300300033 9.25 3.12 0.74 M031300300034 9.75 1.26 0.57 M031300300035 10.25 1.96 0.67 M031300300036 ENDDATA 20 0 M031300300037 ENDSUBENT 36 0 M031300399999 SUBENT M0313004 20180216 M095M031300400001 BIB 4 17 M031300400002 REACTION (79-AU-197(G,X)0-NN-1,DI,DA/DE,,BRA/REL) M031300400003 ANALYSIS For neutron energies greater than about 5 MeV this is M031300400004 simple to obtain from the data, since the M031300400005 contribution by the evaporated neutrons to the M031300400006 spectrum is small at high energies. The situation M031300400007 for En < 5 MeV is much more difficult to resolve, M031300400008 however, since the fraction of the neutrons which M031300400009 are produced by the direct process is not known. M031300400010 Also, the shape of the statistical spectrum may be M031300400011 in error, even though it appears to fit the low M031300400012 energy data well. Nevertheless, if this spectrum is M031300400013 assumed to be correct, then 20 % of the neutrons are M031300400014 found to be produced by a direct process. M031300400015 STATUS (DEP,M0313002) M031300400016 (CURVE) Data from Fig. 2 of Nucl.Phys.20(1960)408. M031300400017 HISTORY (20180216A) Corrected by SD and VV: ANALYSIS, STATUS, M031300400018 SF9 = EXP deleted from REACTION, BRS -> BRA. M031300400019 ENDBIB 17 0 M031300400020 NOCOMMON 0 0 M031300400021 DATA 3 20 M031300400022 E DATA ERR-S M031300400023 MEV ARB-UNITS ARB-UNITS M031300400024 0.75 11.4 4.2 M031300400025 1.25 12.0 5.0 M031300400026 1.75 10.0 5.0 M031300400027 2.25 8.4 4.7 M031300400028 2.75 6.6 4.4 M031300400029 3.25 6.7 3.9 M031300400030 3.75 6.0 3.8 M031300400031 4.25 8.4 1.4 M031300400032 4.75 8.7 1.3 M031300400033 5.25 10.0 1.2 M031300400034 5.75 10.8 1.2 M031300400035 6.25 9.4 1.2 M031300400036 6.75 6.8 1.0 M031300400037 7.25 6.7 1.1 M031300400038 7.75 5.6 1.2 M031300400039 8.25 5.0 1.0 M031300400040 8.75 5.0 1.0 M031300400041 9.25 3.3 0.8 M031300400042 9.75 1.2 0.7 M031300400043 10.25 1.9 0.8 M031300400044 ENDDATA 22 0 M031300400045 ENDSUBENT 44 0 M031300499999 SUBENT M0313005 20180216 M095M031300500001 BIB 4 17 M031300500002 REACTION (79-AU-197(G,X)0-NN-1,DI,DA/DE,,BRA/REL) M031300500003 ANALYSIS For neutron energies greater than about 5 MeV this is M031300500004 simple to obtain from the data, since the M031300500005 contribution by the evaporated neutrons to the M031300500006 spectrum is small at high energies. The situation M031300500007 for En < 5 MeV is much more difficult to resolve, M031300500008 however, since the fraction of the neutrons which M031300500009 are produced by the direct process is not known. M031300500010 Also, the shape of the statistical spectrum may be M031300500011 in error, even though it appears to fit the low M031300500012 energy data well. Nevertheless, if this spectrum is M031300500013 assumed to be correct, then 30 % of the neutrons are M031300500014 found to be produced by a direct process. M031300500015 STATUS (DEP,M0313002) M031300500016 (CURVE) Data from Fig. 2 of Nucl.Phys.20(1960)408. M031300500017 HISTORY (20180216A) Corrected by SD and VV: ANALYSIS, STATUS, M031300500018 SF9 = EXP deleted from REACTION, BRS -> BRA. M031300500019 ENDBIB 17 0 M031300500020 NOCOMMON 0 0 M031300500021 DATA 3 20 M031300500022 E DATA ERR-S M031300500023 MEV ARB-UNITS ARB-UNITS M031300500024 0.75 26.2 4.1 M031300500025 1.25 27.7 4.8 M031300500026 1.75 22.8 4.9 M031300500027 2.25 18.1 4.7 M031300500028 2.75 12.9 4.2 M031300500029 3.25 10.8 4.0 M031300500030 3.75 8.7 3.2 M031300500031 4.25 10.0 1.5 M031300500032 4.75 9.7 1.3 M031300500033 5.25 10.1 1.2 M031300500034 5.75 11.2 1.2 M031300500035 6.25 9.9 1.3 M031300500036 6.75 6.9 1.0 M031300500037 7.25 6.7 1.0 M031300500038 7.75 5.7 0.8 M031300500039 8.25 5.0 0.9 M031300500040 8.75 5.0 1.0 M031300500041 9.25 3.2 0.9 M031300500042 9.75 1.4 0.7 M031300500043 10.25 1.9 0.8 M031300500044 ENDDATA 22 0 M031300500045 ENDSUBENT 44 0 M031300599999 ENDENTRY 5 0 M031399999999