ENTRY G4087 20200108 G044G408700000001 SUBENT G4087001 20200108 G044G408700100001 BIB 13 34 G408700100002 TITLE Excitation of 179Hfm2 with (g,n) -reaction G408700100003 AUTHOR (V.A.Zheltonozhsky, A.M.Savrasov) G408700100004 INSTITUTE (4UKRIJD) G408700100005 REFERENCE (J,NIM/B,456,116,2019) G408700100006 #doi:10.1016/j.nimb.2019.06.029 G408700100007 FACILITY (MICRT,4UKRIEP) The M-30 microtron G408700100008 INC-SOURCE (BRST) The bremsstrahlung was generated by impinging ofG408700100009 the electron beam on the solid tantalum and aluminum G408700100010 beam dumps. The absolute bremsstrahlung fluence was G408700100011 monitored by the 176Hf(gamma,n)175Hf reaction. G408700100012 SAMPLE The targets were made of powdery hafnium, both G408700100013 natural isotope composition and enriched 180Hf till G408700100014 94.3%. At 14.5 MeV the target represented the G408700100015 enriched 180HfO2, weight 1.532 g, which was sealed in G408700100016 the oval quartz vessel. At 14.8 MeV the target G408700100017 consisted of the natHfO2 powder, weight 8.85 g, which G408700100018 was put in the aluminum cylindrical vessel. G408700100019 METHOD (ACTIV) Induced gamma-activity was measured. G408700100020 DETECTOR (HPGE) HPGe-detector which have the energy resolution G408700100021 of 1.8-2 keV at the 1332.5 keV peak of 60Co G408700100022 ERR-ANALYS (ERR-T) The total uncertainty G408700100023 (ERR-1) Number of counts for Eg=362.6 keV 32.8% G408700100024 (ERR-2,41.5,51.6) Number of counts for Eg=453.6 keV G408700100025 (ERR-3) Intensity for Eg=362.6 keV 3.8% G408700100026 (ERR-4) Intensity for Eg=453.6 keV 4.4% G408700100027 (ERR-5) Efficiency 5% G408700100028 (ERR-6) Self-absorption 3% G408700100029 (ERR-7) Integral Flux 11.6% G408700100030 (ERR-8) Conversion ratio 3% G408700100031 ADD-RES (COMP)Measured isomeric ratios were compared with G408700100032 values of model calculation TALYS-1.6 and EMPIRE-3.2 G408700100033 codes. G408700100034 STATUS (TABLE) From Tab.1 in Nucl.Instr.Meth.B,456,116,2019 G408700100035 HISTORY (20200108C)UkrNDC G408700100036 ENDBIB 34 0 G408700100037 COMMON 7 6 G408700100038 ERR-1 ERR-3 ERR-4 ERR-5 ERR-6 ERR-7 G408700100039 ERR-8 G408700100040 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT G408700100041 PER-CENT G408700100042 32.8 3.8 4.4 5. 3. 11.6 G408700100043 3. G408700100044 ENDCOMMON 6 0 G408700100045 ENDSUBENT 44 0 G408700199999 SUBENT G4087002 20200108 G044G408700200001 BIB 3 12 G408700200002 REACTION (72-HF-180(G,N)72-HF-179-M2/G,,SIG/RAT,,BRA,DERIV) G408700200003 DECAY-DATA (72-HF-179-M2,25.1D,DG,362.6,0.396, G408700200004 DG,453.6,0.68) G408700200005 (72-HF-175,70.D,DG,343.4,0.84) G408700200006 Taken by authors from R.B.Firestone, Table of Isotops, G408700200007 8th ed. G408700200008 ANALYSIS The author assumed the similarity of the excitation G408700200009 functions for the (g,n)-reactions on the 176Hf and G408700200010 180Hf nuclei in the used range of bremsstrahlung G408700200011 energies, so to determine the yield for the stable G408700200012 179Hf ground state, was used the 176Hf(g,n)175Hf G408700200013 reaction and the unstable ground state of 175Hf. G408700200014 ENDBIB 12 0 G408700200015 NOCOMMON 0 0 G408700200016 DATA 3 2 G408700200017 EN-MAX DATA ERR-T G408700200018 MEV NO-DIM NO-DIM G408700200019 14.5 0.12E-5 0.05E-5 G408700200020 14.8 0.31E-5 0.025E-5 G408700200021 ENDDATA 4 0 G408700200022 ENDSUBENT 21 0 G408700299999 SUBENT G4087003 20200108 G044G408700300001 BIB 6 8 G408700300002 REACTION (72-HF-180(G,N)72-HF-179-M2,,SIG,,BRA,DERIV) G408700300003 MISC-COL (MISC) Integral cross-section G408700300004 MONITOR (72-HF-176(G,N)72-HF-175,,SIG,,BRS) G408700300005 MONIT-REF ((MONIT)M0007002,A.M.Goryachev+,J,SNP,26,246,1977) G408700300006 ANALYSIS The authors assumed that contribution of the G408700300007 176Hf(g,2n) reaction is neglected in the used range of G408700300008 bremsstrahlung energies. G408700300009 STATUS (DEP,G4087002) G408700300010 ENDBIB 8 0 G408700300011 NOCOMMON 0 0 G408700300012 DATA 5 2 G408700300013 EN-MAX DATA ERR-T MISC MISC-ERR G408700300014 MEV MICRO-B MICRO-B MB*MEV MB*MEV G408700300015 14.5 0.18 0.08 0.71E-03 0.31E-03 G408700300016 14.8 0.49 0.07 1.85E-03 0.27E-03 G408700300017 ENDDATA 4 0 G408700300018 ENDSUBENT 17 0 G408700399999 ENDENTRY 3 0 G408799999999