ENTRY M0357 20131205 M069M035700000001 SUBENT M0357001 20131205 M069M035700100001 BIB 16 51 M035700100002 TITLE Fast photoneutrons from Be-9, C-12 and Al-27. M035700100003 AUTHOR (L.A.Kul'chickij,V.Presperin) M035700100004 INSTITUTE (4RUSFTI) M035700100005 REFERENCE (J,ZET,37,(6),1524,1959) M035700100006 (J,JET,10,1082,1960) M035700100007 English translation of ZET,37,(6),1524,1959. M035700100008 FACILITY (SYNCH,4RUSFTI) M035700100009 INC-SOURCE (BRST) M035700100010 SAMPLE Plane target and cylindrical targets were used to M035700100011 study the energy spectrum of photoneutrons from C-12 M035700100012 and angular distributions of photoneutrons from M035700100013 Be-9, C-12 and Al-27 respectively. Sizes of targets M035700100014 WERE CHOSEN TO RESTRICT A FRACTION OF NEUTRONS M035700100015 scattered inelastically in a sample and a lead slab M035700100016 before detector by 5 p. c. to study the energy M035700100017 spectrum and 10 p.c. to study the angular M035700100018 distributions. M035700100019 METHOD (REC) A paraffin disk was used as a converter. M035700100020 PART-DET (P) M035700100021 DETECTOR (TELES,SCIN,SCIN) a lead slab was placed before M035700100022 converter and detector for absorption of M035700100023 photoprotons and main part of electrons emitted by a M035700100024 target. M035700100025 CORRECTION The angular distributions were corrected for (a) the M035700100026 thickness of the converter,(b) the dependence of M035700100027 efficiency of registration on neutron energy and (c) M035700100028 the angle of (n,p)-scattering. M035700100029 ERR-ANALYS (ERR-S) Statistical errors of measurements. The M035700100030 background was negligible. It was less than 3 p.c. M035700100031 for measurements of angular distributions and 5 p.c. M035700100032 for measurement of energy spectrum. M035700100033 REL-REF (N,,V.P.Chizhov+,J,ZET,36,345,1959) The description M035700100034 of the detector. M035700100035 COMMENT An investigation was carried out of the angular M035700100036 distribution of photoneutrons with energies above 10 M035700100037 MeV emitted by Be-9, C-12 and Al-27 targets under M035700100038 the irradiation by 88 MeV end-point energy M035700100039 bremsstrahlung. The energy spectrum of photoneutrons M035700100040 emitted at the angle of 75 degrees from C-12 was M035700100041 also investigated and from the data thus obtained a M035700100042 comparison is made of the photoneutron and M035700100043 photoproton yields in the same energy intervals. The M035700100044 angular distribution results are compared with the M035700100045 quasi-deutron model and the model of direct M035700100046 resonance nuclear photoeffect. Qualitative agreement M035700100047 with the quasi-deutron model has been obtained. M035700100048 STATUS (CURVE) M035700100049 HISTORY (19901213C) data were compiled at the SCJAD of M035700100050 Saratov State University. M035700100051 (20131205A) Corrected by V.Varlamov: REFERENCE, M035700100052 STATUS, REACTION, dates, lowercase. M035700100053 ENDBIB 51 0 M035700100054 COMMON 1 3 M035700100055 EN-MAX M035700100056 MEV M035700100057 88. M035700100058 ENDCOMMON 3 0 M035700100059 ENDSUBENT 58 0 M035700199999 SUBENT M0357002 20131205 M069M035700200001 BIB 3 3 M035700200002 REACTION (4-BE-9(G,X)0-NN-1,PAR,DA,,BRA/REL) M035700200003 STATUS Data from Fig. 5. M035700200004 HISTORY (20131205A) Corrected by V.Varlamov: DA/DE -> DA. M035700200005 ENDBIB 3 0 M035700200006 COMMON 1 3 M035700200007 E-MIN M035700200008 MEV M035700200009 10. M035700200010 ENDCOMMON 3 0 M035700200011 DATA 3 6 M035700200012 ANG DATA ERR-S M035700200013 ADEG ARB-UNITS ARB-UNITS M035700200014 30.0 18.0 1.8 M035700200015 52.5 21.1 1.8 M035700200016 75.0 23.3 1.6 M035700200017 97.5 17.1 1.3 M035700200018 120.0 12.5 1.6 M035700200019 142.5 9.4 1.3 M035700200020 ENDDATA 8 0 M035700200021 ENDSUBENT 20 0 M035700299999 SUBENT M0357003 20131205 M069M035700300001 BIB 3 3 M035700300002 REACTION (6-C-12(G,X)0-NN-1,PAR,DA,,BRA/REL) M035700300003 STATUS Data from Fig. 4. M035700300004 HISTORY (20131205A) Corrected by V.Varlamov: DA/DE -> DA. M035700300005 ENDBIB 3 0 M035700300006 COMMON 1 3 M035700300007 E-MIN M035700300008 MEV M035700300009 10. M035700300010 ENDCOMMON 3 0 M035700300011 DATA 3 6 M035700300012 ANG DATA ERR-S M035700300013 ADEG ARB-UNITS ARB-UNITS M035700300014 35.0 17.9 1.1 M035700300015 57.5 21.7 1.3 M035700300016 80.0 19.6 1.1 M035700300017 102.5 14.3 0.9 M035700300018 125.0 10.4 0.8 M035700300019 147.5 6.8 0.8 M035700300020 ENDDATA 8 0 M035700300021 ENDSUBENT 20 0 M035700399999 SUBENT M0357004 20131205 M069M035700400001 BIB 3 3 M035700400002 REACTION (13-AL-27(G,X)0-NN-1,PAR,DA,,BRA/REL) M035700400003 STATUS Data from Fig. 6. M035700400004 HISTORY (20131205A) Corrected by V.Varlamov: DA/DE -> DA. M035700400005 ENDBIB 3 0 M035700400006 COMMON 1 3 M035700400007 E-MIN M035700400008 MEV M035700400009 10. M035700400010 ENDCOMMON 3 0 M035700400011 DATA 3 8 M035700400012 ANG DATA ERR-S M035700400013 ADEG ARB-UNITS ARB-UNITS M035700400014 35.0 18.2 1.6 M035700400015 45.0 19.3 1.5 M035700400016 60.0 22.3 1.8 M035700400017 75.0 15.9 1.5 M035700400018 90.0 17.8 1.6 M035700400019 105.0 10.8 1.3 M035700400020 120.0 8.2 1.1 M035700400021 135.0 6.5 1.1 M035700400022 ENDDATA 10 0 M035700400023 ENDSUBENT 22 0 M035700499999 SUBENT M0357005 20131205 M069M035700500001 BIB 6 23 M035700500002 REACTION (6-C-12(G,X)0-NN-1,,DA/DE,,BRA/REL) M035700500003 Common logarithm of neutron spectrum is presented. M035700500004 ANALYSIS To determine the photoneutron spectrum the groups of M035700500005 proton recoils formed in the converter by neutrons M035700500006 from 1 MeV-wide range around the mean energies E(i) M035700500007 were graphically found. On the basis of such graphs M035700500008 constructed for the neutrons energies E(i) with the M035700500009 step of 1 MeV the number of recoil protons in each M035700500010 energy interval may be calculated by summing the M035700500011 number of neutrons multiplied by some coefficient M035700500012 over all possible values of E(i). The energy M035700500013 distribution of neutrons which took place after M035700500014 calculations the experimental distribution of M035700500015 protons was regarded as the real photoneutron M035700500016 spectrum. M035700500017 CORRECTION For (a) the thickness of the converter and (b) the M035700500018 cross section of (n,p)-scattering were made. M035700500019 ERR-ANALYS (DATA-ERR) No information. The method of energy M035700500020 spectrum calculation leads to appearance of the M035700500021 additional errors. The summary error was estimated M035700500022 as 40 p.c. (without the statistical errors). M035700500023 COMMENT Arb-unit=cm**2/sr/mev/10**30/q-val. M035700500024 STATUS Data from Fig. 3. M035700500025 ENDBIB 23 0 M035700500026 COMMON 1 3 M035700500027 ANG M035700500028 ADEG M035700500029 75. M035700500030 ENDCOMMON 3 0 M035700500031 DATA 3 7 M035700500032 E DATA DATA-ERR M035700500033 MEV ARB-UNITS ARB-UNITS M035700500034 15.0 0.79 0.04 M035700500035 20.0 0.61 0.04 M035700500036 25.0 0.47 0.05 M035700500037 30.0 0.35 0.06 M035700500038 35.0 0.25 0.07 M035700500039 40.0 0.16 0.09 M035700500040 47.5 -0.91 0.23 M035700500041 ENDDATA 9 0 M035700500042 ENDSUBENT 41 0 M035700599999 ENDENTRY 5 0 M035799999999