ENTRY M0392 20121104 M065M039200000001 SUBENT M0392001 20121104 M065M039200100001 BIB 16 78 M039200100002 TITLE Neutron spectra from monoenergetic photons on bismuth. M039200100003 AUTHOR (F.T.Kuchnir,P.Axel,L.Criegee,D.M.Drake,A.O.Hanson, M039200100004 D.C.Sutton) M039200100005 INSTITUTE (1USAUI) M039200100006 REFERENCE (J,PR,161,(4),1236,1967) M039200100007 FACILITY (BETAT,1USAUI) M039200100008 INC-SOURCE (TAGD) The bremsstrahlung monochromator identifies M039200100009 photon energies by determining the energies of an M039200100010 electron before and after it emits a bremsstrahlung M039200100011 gamma-ray. M039200100012 SAMPLE The 3/8-in.thick plate of Bi-209 was used as a target. M039200100013 The normal to the sample made an angle of 50 deg. M039200100014 with respect to the incoming beam. M039200100015 METHOD (COINC) For identification of photon energy. M039200100016 (TOF,PHD) For determination of neutron energy. M039200100017 (MAGFR) For determination of the energy of secondary M039200100018 electron. M039200100019 PART-DET (N) M039200100020 DETECTOR (SCIN) For both kinds of particles detected. M039200100021 The neutron detector consisted of a cylindrical pyrex M039200100022 container, 6 in. In diameter and 3 in.deep, which was M039200100023 filled with NE 213 liquid scintillator. The detector M039200100024 was placed at 150 cm from the target at 115 deg. with M039200100025 respect to the gamma beam and was shielded from M039200100026 gamma-rays on the front face by 1-in. thick screen of M039200100027 lead. The secondary electrons were detected by a M039200100028 3-in.-wide * 1.62-in.-hight * 2-in.-thick pilot B M039200100029 plastic scintillator. M039200100030 ANALYSIS To obtain a discrete probability the data were reduced M039200100031 to the probability dp(E,Eg) that an interacting M039200100032 photon of energy Eg will produce a neutron in the M039200100033 energy range between E and E+dE by dividing the M039200100034 number of observed neutrons by a factor proportional M039200100035 to the number of absorbed gamma-rays given by product M039200100036 of the measured number of incident gamma-rays and the M039200100037 photon-absorption cross section. A discrete M039200100038 probability was defined as an integral of dp(E,Eg) M039200100039 over the energy interval of fixed width around M039200100040 discrete value of neutron energy or excitation energy M039200100041 in the residual nucleus into which the experimental M039200100042 data were grouped. M039200100043 ERR-ANALYS EN-RSL - The gamma-ray energy resolution. M039200100044 (E-ERR) Half of energy range into which the M039200100045 experimental data were M039200100046 grouped. M039200100047 EN-SEC (E-EXC,83-BI-208) The excitation energy of the M039200100048 residual nucleus. M039200100049 ADD-RES (COMP) Statistical model and the simplest model of M039200100050 nonstatistical emission which treats the complicated M039200100051 giant resonance as though it is a simple resonance M039200100052 associated with a single dipole state were used. M039200100053 (LD) The energy dependence of the level density of M039200100054 Bi- 208 was obtained. M039200100055 COMMENT Spectra of photoneutrons from a Bi-209 target were M039200100056 obtained in the electric dipole giant resonance M039200100057 region (12-16 MeV). About 88% of the neutrons M039200100058 ejected by 14-MeV gamma-rays are statistical. The M039200100059 inferred level density of Bi-208 near its ground M039200100060 state is not a simple function of excitation energy, M039200100061 but from 4 to 7 MeV it increases exponentially with M039200100062 energy. In that energy range the temperature is about M039200100063 1 MeV. The nonstatistical high-energy neutrons leave M039200100064 the Bi-208 nucleus at the excitation energies at M039200100065 which the states are well represented as M039200100066 single-neutrons holes in Bi-209. these high-energy M039200100067 neutrons are intimately connected with the giant M039200100068 resonance. If the giant resonance is dominated by a M039200100069 single dipole state, the absolute width which M039200100070 characterizes the decay of the dipole state into the M039200100071 compound nucleus must increase by a factor of about 3 M039200100072 between 12 and 16 MeV. M039200100073 HISTORY (19871220C) Data were compiled in the SCJAD of M039200100074 Saratov State University. M039200100075 (20121104U) SD: Updated to new date formats,lower case.M039200100076 Corrected according last EXFOR rules and Dict. M039200100077 VV: ERR-ANALYS, NOSUBENT instead of M039200100078 SUBENTS 002 - 042 because there are no data for M039200100079 EXFOR. M039200100080 ENDBIB 78 0 M039200100081 COMMON 2 3 M039200100082 ANG EN-RSL M039200100083 ADEG PER-CENT M039200100084 115. 1.5 M039200100085 ENDCOMMON 3 0 M039200100086 ENDSUBENT 85 0 M039200199999 NOSUBENT M0392002 20121104 M065M039200200001 NOSUBENT M0392003 20121104 M065M039200300001 NOSUBENT M0392004 20121104 M065M039200400001 NOSUBENT M0392005 20121104 M065M039200500001 NOSUBENT M0392006 20121104 M065M039200600001 NOSUBENT M0392007 20121104 M065M039200700001 NOSUBENT M0392008 20121104 M065M039200800001 NOSUBENT M0392009 20121104 M065M039200900001 NOSUBENT M0392010 20121104 M065M039201000001 NOSUBENT M0392011 20121104 M065M039201100001 NOSUBENT M0392012 20121104 M065M039201200001 NOSUBENT M0392013 20121104 M065M039201300001 NOSUBENT M0392014 20121104 M065M039201400001 NOSUBENT M0392015 20121104 M065M039201500001 NOSUBENT M0392016 20121104 M065M039201600001 NOSUBENT M0392017 20121104 M065M039201700001 NOSUBENT M0392018 20121104 M065M039201800001 NOSUBENT M0392019 20121104 M065M039201900001 NOSUBENT M0392020 20121104 M065M039202000001 NOSUBENT M0392021 20121104 M065M039202100001 NOSUBENT M0392022 20121104 M065M039202200001 NOSUBENT M0392023 20121104 M065M039202300001 NOSUBENT M0392024 20121104 M065M039202400001 NOSUBENT M0392025 20121104 M065M039202500001 NOSUBENT M0392026 20121104 M065M039202600001 NOSUBENT M0392027 20121104 M065M039202700001 NOSUBENT M0392028 20121104 M065M039202800001 NOSUBENT M0392029 20121104 M065M039202900001 NOSUBENT M0392030 20121104 M065M039203000001 NOSUBENT M0392031 20121104 M065M039203100001 NOSUBENT M0392032 20121104 M065M039203200001 NOSUBENT M0392033 20121104 M065M039203300001 NOSUBENT M0392034 20121104 M065M039203400001 NOSUBENT M0392035 20121104 M065M039203500001 NOSUBENT M0392036 20121104 M065M039203600001 NOSUBENT M0392037 20121104 M065M039203700001 NOSUBENT M0392038 20121104 M065M039203800001 NOSUBENT M0392039 20121104 M065M039203900001 NOSUBENT M0392040 20121104 M065M039204000001 NOSUBENT M0392041 20121104 M065M039204100001 NOSUBENT M0392042 20121104 M065M039204200001 ENDENTRY 42 0 M039299999999