ENTRY 22969 20180831 22702296900000001 SUBENT 22969001 20180831 22702296900100001 BIB 14 70 2296900100002 TITLE Neutron Induced Reactions at the Athens Tandem 2296900100003 Accelerator NCSR "Demokritos". 2296900100004 AUTHOR (R.Vlastou, C.T.Papadopoulos, M.Kokkoris, G.Perdikakis,2296900100005 S.Galanopoulos, M.Serris, A.Lagoyannis, S.Harissopulos,2296900100006 C.A.Kalfas, N.Patronis, P.Demetriou) 2296900100007 INSTITUTE (2GRCTUA) Vlastou, Papadopoulos, Kokkoris, Perdikakis, 2296900100008 Galanopoulos, Serris, Patronis, Demetriou. 2296900100009 (2GRCATH) Perdikakis, Lagoyannis, Kalfas,Lagoyannis. 2296900100010 REFERENCE (J,JRN,272,219,2007) 2296900100011 #doi:10.1007/s10967-007-0503-8 2296900100012 (C,2007NICE,1,471,200704) 2296900100013 #doi:10.1051/ndata:07507 2296900100014 72-Ge(n,alpha)69m-Zn, 74-Ge(n,alpha)71m-Zn, 2296900100015 76-Ge(n,2n)75-Ge - reactions; 2296900100016 data for 191-Ir(n,2n)190m1-Ir, 190m2-Ir 2296900100017 reactions are given in 22966 2296900100018 (J,NIM/B,261,941,2007) First author M.Serris. 2296900100019 #doi:10.1016/j.nimb.2007.04.008 2296900100020 Hf-174(n,2n) data . 2296900100021 (J,NIM/B,261,969,2007)First author S.Galanopoulos 2296900100022 #doi:10.1016/j.nimb.2007.04.007 2296900100023 72,73-Ge(n,p)72,73-Ga reactions. 2296900100024 (S,AIP-1090,627,200902) Fig.1- Ge-72(n,a)Zn-69m, 2296900100025 Ge-74(n,a)Zn-71m, Ge-76(n,2n)Ge-75 cross-section. 2296900100026 FACILITY (VDGT,2GRCATH) The 5.5 MV tandem T11/25 accelerator of 2296900100027 NCSR DEMOKRITOS. 2296900100028 INC-SOURCE (D-D) For 4 - 11.5 MeV neutrons. 2296900100029 deuteron energy 0.8 - 8.2 MeV. 2296900100030 INC-SPECT Monoenergetic neutron beam with maximum flux of order 2296900100031 1.x 10**5 - 1. x 10**6 n/cm**2/s. 2296900100032 DETECTOR (HPGE) Two (56% and 80%) HPGe-detectors shield with 2296900100033 lead blocks for induced activity measurement. 2296900100034 Efficiency of detectors was determined via calibrated 2296900100035 Eu-152 source. 2296900100036 (BF3) BF3-counter for neutron beam flux variation 2296900100037 monitoring during irradiation, place at 3m from neutron2296900100038 source. 2296900100039 METHOD (ACTIV) Activation 2296900100040 MONITOR (79-AU-197(N,2N)79-AU-196-G,,SIG) 2296900100041 (41-NB-93(N,2N)41-NB-92-M,,SIG) 2296900100042 (13-AL-27(N,A)11-NA-24,,SIG) 2296900100043 (49-IN-115(N,INL)49-IN-115-M,,SIG) 2296900100044 (26-FE-56(N,P)25-MN-56,,SIG) 2296900100045 To deduce average neutron beam flux during irradiation.2296900100046 CORRECTION For self-absorption of sample, 2296900100047 for coincidence summing effects of cascade gamma rays 2296900100048 and counting geometry. 2296900100049 ADD-RES (COMP) Data are compared with EMPIRE-II code 2296900100050 calculations - in S,AIP-1090 . 2296900100051 STATUS (APRVD) Data received from author R.Vlastou. 2296900100052 HISTORY (20070801C) M.M./S.M. 2296900100053 (20090318A) M.M. References were added: 2296900100054 C,2007NICE,1,471,200704 , J,NIM/B,261,941,2007 , 2296900100055 J,NIM/B,261,(1-2),969,2007 . Authors names were added.2296900100056 BIB and COMMON information was added. 2296900100057 Digitized data were replaced by authors' data in 2296900100058 Subents 005, 006, 008. Units were corrected in 2296900100059 Subent 007 . 2296900100060 (20090619A) Reference S,AIP-109O was added. M.M. 2296900100061 BIB information was added. 2296900100062 (20110226A) SD: The year of ref. on AIP-1090,627,2008082296900100063 changed. STATUS "APRVD" moved to Subent 1 from others. 2296900100064 In Subents 005 - 008 corrections in DATA and in 2296900100065 BIB section made. 2296900100066 (20121016A) M.M. Duplicative name of author was 2296900100067 deleted. 2296900100068 Subents 004,007 were superseded according to comment 2296900100069 of R.Vlastou. 2296900100070 (20180831U) SD: ERR-2 -> ERR-3 in COMMON section in 2296900100071 Subents 003, 005, 006, 008. 2296900100072 ENDBIB 70 0 2296900100073 NOCOMMON 0 0 2296900100074 ENDSUBENT 73 0 2296900199999 SUBENT 22969002 20110226 22262296900200001 BIB 7 22 2296900200002 REACTION (32-GE-72(N,P)31-GA-72,,SIG) 2296900200003 DECAY-DATA (31-GA-72,14.10HR,DG,834.,0.9563) 2296900200004 SAMPLE High purity natural Ge pellets of 1.3 cm diameter, 2296900200005 about 0.7 g weight, doped with 12 % high purity C. 2296900200006 Ge-72 Abundance (27.31+-0.26)%. 2296900200007 Pellets were placed between reference foils and exposed2296900200008 about 2 days. 2296900200009 ERR-ANALYS (ERR-T) Total error 2296900200010 (ERR-1) Error of detector efficiency 2%, 2296900200011 (ERR-2,1.,2.) Error of number of target nuclei 1 - 2%, 2296900200012 (ERR-S,1.,3.) Error of statistics of analyzed 2296900200013 photopeaks (1 - 3%), 2296900200014 (MONIT-ERR,1.,2.) Error of cross-sections of 2296900200015 reference reactions(1 - 2%), 2296900200016 (ERR-3) Error of summing coincidence effects (6%) 2296900200017 (ERR-4,1.,2.) Error of self-absorption 2296900200018 coefficients (1 - 2%). 2296900200019 MONIT-REF (,,3,IRDF-2002,,2002) 2296900200020 CORRECTION It was concluded, that in the energy range of this 2296900200021 measurements there is no contribution from 2296900200022 73-Ge(n,np + pn + d) reactions. 2296900200023 STATUS (TABLE) Table 1 of J,NIM/B,261,(1-2),969,2007 . 2296900200024 ENDBIB 22 0 2296900200025 COMMON 2 3 2296900200026 ERR-1 ERR-3 2296900200027 PER-CENT PER-CENT 2296900200028 2. 6. 2296900200029 ENDCOMMON 3 0 2296900200030 DATA 4 5 2296900200031 EN EN-ERR DATA ERR-T 2296900200032 MEV MEV MB MB 2296900200033 8.80 0.05 7.9 0.6 2296900200034 9.60 0.05 10.5 1.6 2296900200035 10.60 0.05 13.3 1.4 2296900200036 11.10 0.04 14.5 1.8 2296900200037 11.40 0.04 17.2 1.8 2296900200038 ENDDATA 7 0 2296900200039 ENDSUBENT 38 0 2296900299999 SUBENT 22969003 20180831 22702296900300001 BIB 8 32 2296900300002 REACTION (32-GE-73(N,P)31-GA-73,,SIG) 2296900300003 DECAY-DATA (31-GA-73,4.86HR,DG,297.,0.798) 2296900300004 SAMPLE High purity natural Ge pellets of 1.3 cm diameter, 2296900300005 about 0.7 g weight, doped with 12 % high purity C. 2296900300006 Ge-73 Abundance (7.76+-0.80)%. 2296900300007 Pellets were placed between reference foils and exposed2296900300008 about 2 days. 2296900300009 ERR-ANALYS (ERR-T) Total error 2296900300010 (ERR-1) Error of detector efficiency 2%, 2296900300011 (ERR-2,1.,2.) Error of number of target nuclei 1 - 2%, 2296900300012 (ERR-S,1.,3.) Error of statistics of analyzed 2296900300013 photopeaks (1 - 3%), 2296900300014 (MONIT-ERR,1.,2.) Error of cross-sections of 2296900300015 reference reactions(1 - 2%), 2296900300016 (ERR-3) Error of summing coincidence effects (6%) 2296900300017 (ERR-4,1.,2.) Error of self-absorption 2296900300018 coefficients (1 - 2%). 2296900300019 MONIT-REF (,,3,IRDF-2002,,2002) 2296900300020 CORRECTION It was concluded, that in the energy range of this 2296900300021 measurements there is no contribution from 2296900300022 74-Ge(n,np + pn + d) reactions. 2296900300023 73Ge(n,p)73Ga cross-section could be contaminated by 2296900300024 76Ge(n,alpha)73Zn followed by Beta- decay to 73Ga, was2296900300025 negligible in energy range, since 76Ge is the less 2296900300026 abundant isotope in natural Ge and 72Ge(n,alpha) and 2296900300027 74Ge(n,alpha) reaction cross-sections are less 3 and 2296900300028 1 mb, respectively. (n,alpha) cross-section decreases 2296900300029 with increasing neutron number of Ge isotopes, so for 2296900300030 76Ge, it is expected to be much less than 1 mb and 2296900300031 does not influence the 73Ge(n,p)73Ga yield. 2296900300032 STATUS (TABLE) Table 1 of Nucl.Instr.Meth.B261(2007),969 2296900300033 HISTORY (20180831U) SD: ERR-2 -> ERR-3 in COMMON section. 2296900300034 ENDBIB 32 0 2296900300035 COMMON 2 3 2296900300036 ERR-1 ERR-3 2296900300037 PER-CENT PER-CENT 2296900300038 2. 6. 2296900300039 ENDCOMMON 3 0 2296900300040 DATA 4 5 2296900300041 EN EN-ERR DATA ERR-T 2296900300042 MEV MEV MB MB 2296900300043 8.80 0.05 4.3 0.8 2296900300044 9.60 0.05 6.5 0.8 2296900300045 10.60 0.05 6.7 1.2 2296900300046 11.10 0.04 9.1 1.8 2296900300047 11.40 0.04 8.0 2.0 2296900300048 ENDDATA 7 0 2296900300049 ENDSUBENT 48 0 2296900399999 SUBENT 22969004 20121016 22332296900400001 BIB 10 38 2296900400002 REACTION (72-HF-174(N,2N)72-HF-173,,SIG) 2296900400003 INC-SOURCE (D-D) D2 gas target bombarding with deuteron beam of 2296900400004 2-6 microA currents. 2296900400005 INC-SPECT Quasi-monoenergetic neutron beams at a flux 2296900400006 4. x 10**6 n/cm**2/sec. 2296900400007 DECAY-DATA (72-HF-173,23.6HR,DG,123.67,0.83) 2296900400008 (11-NA-24,14.96HR,DG,1368.6,1.00) 2296900400009 (41-NB-92-M,10.15D,DG,934.,0.99) 2296900400010 (79-AU-196,6.2D,DG,355.7,0.87) 2296900400011 MONIT-REF (,,3,IRDF-2002,,2002) 2296900400012 SAMPLE Natural Hf-O2 pellets of 1.3 cm diameter,masses varying2296900400013 from 0.667 g to 0.953 g, produced by compressing a 2296900400014 mixture of high 99.9% purity powder Hf-O2 and C in 2296900400015 concentrations 88% and 12%, respectively. 2296900400016 Hf-174 Abundance (0.162+-0.01)%. 2296900400017 Reference metallic targets of high purity - Al, Nb, Au 2296900400018 were placed in the front and the back of pellets to 2296900400019 measure neutron flux at target position. 2296900400020 METHOD (STTA) 2296900400021 CORRECTION Off-line correction of the fraction of 173-Hf nuclei, 2296900400022 which had already decayed during activation. 2296900400023 The correction was found to be 35% due to the low 2296900400024 energy (123 keV) of the c-ray emitted inside the 2296900400025 activated Hf sample. 2296900400026 ERR-ANALYS (ERR-T) Total error - about 10% . 2296900400027 (ERR-1) Error in HPGe detector efficiency - 4%, 2296900400028 (ERR-2) Error in determination of target masses -2%. 2296900400029 (ERR-3) Error in reference 13-AL-27(N,A) reaction-1.5%.2296900400030 EN-ERR - error of neutron beam energy, determined by 2296900400031 considering the kinematics of D-D reaction, actual 2296900400032 size and material of the cell window, the pressure of 2296900400033 the gas cell and the distance of the samples from the 2296900400034 middle of the cell. 2296900400035 STATUS (PRELM) Data are preliminary. New experiment in process2296900400036 (TABLE) Data received from author R.Vlastou. Data are 2296900400037 presented on Fig.3 of J,NIM/B,261,(1-2),941. 2296900400038 (SPSDD,23184002) Superseded according to comment of 2296900400039 R.Vlastou. 2296900400040 ENDBIB 38 0 2296900400041 COMMON 4 3 2296900400042 EN-ERR ERR-1 ERR-2 ERR-3 2296900400043 MEV PER-CENT PER-CENT PER-CENT 2296900400044 0.04 4. 2. 1.5 2296900400045 ENDCOMMON 3 0 2296900400046 DATA 3 3 2296900400047 EN DATA ERR-T 2296900400048 MEV MB MB 2296900400049 9.8 532. 79. 2296900400050 11.1 1352. 183. 2296900400051 11.5 1752. 271. 2296900400052 ENDDATA 5 0 2296900400053 ENDSUBENT 52 0 2296900499999 SUBENT 22969005 20180831 22702296900500001 BIB 7 24 2296900500002 REACTION (32-GE-72(N,A)30-ZN-69-M,,SIG) 2296900500003 SAMPLE Natural Ge. Ge-72 Abundance (27.31+-0.26)%. 2296900500004 DECAY-DATA (30-ZN-69-M,13.76HR,DG,438.) 2296900500005 CORRECTION Contamination in the production of Zn-69 by 2296900500006 Ge-73(n,n+alpha)Zn-69 reaction is negligible due to the2296900500007 low cross section in this energy range as well as lower2296900500008 abundance of Ge-73 relative to Ge-72. 2296900500009 ERR-ANALYS (ERR-T) Total error 2296900500010 (ERR-1) Error of detector efficiency 2%, 2296900500011 (ERR-2,1.,2.) Error of number of target nuclei 1 - 2%, 2296900500012 (MONIT-ERR,1.,2.) Error of cross-sections of 2296900500013 reference reactions(1 - 2%), 2296900500014 (ERR-3) Error of summing coincidence effects (6%) 2296900500015 (ERR-4,1.,2.) Error of self-absorption 2296900500016 coefficients (1 - 2%). 2296900500017 STATUS (TABLE) Data received from R.Vlastou 8.04.2009. Data 2296900500018 are presented on Fig.1 of J.Rad.Nucl.Chem.272(2007)219 2296900500019 and on Fig.2 of 2007NICE,1,471,2007. 2296900500020 HISTORY (20090408A) M.M. Digitized data were replaced by 2296900500021 authors' data. 2296900500022 (20110226A) SD: Units in DATA changed: B => MB; 2296900500023 EN-ERR multiplied on 10. DATA-ERR => ERR-T 2296900500024 ERR-ANALYS and COMMON section added. 2296900500025 (20180831U) SD: ERR-2 -> ERR-3 in COMMON section. 2296900500026 ENDBIB 24 0 2296900500027 COMMON 2 3 2296900500028 ERR-1 ERR-3 2296900500029 PER-CENT PER-CENT 2296900500030 2. 6. 2296900500031 ENDCOMMON 3 0 2296900500032 DATA 4 4 2296900500033 EN EN-ERR DATA ERR-T 2296900500034 MEV MEV MB MB 2296900500035 9.60 0.05 1.8 0.2 2296900500036 10.60 0.05 2.2 0.1 2296900500037 11.10 0.04 2.6 0.4 2296900500038 11.40 0.04 3.0 0.2 2296900500039 ENDDATA 6 0 2296900500040 ENDSUBENT 39 0 2296900599999 SUBENT 22969006 20180831 22702296900600001 BIB 6 20 2296900600002 REACTION (32-GE-74(N,A)30-ZN-71-M,,SIG) 2296900600003 SAMPLE Natural Ge. Ge-74 Abundance (36.73+-0.15)%. 2296900600004 DECAY-DATA (30-ZN-71-M,3.96HR,DG,386.) 2296900600005 ERR-ANALYS (ERR-T) Total error 2296900600006 (ERR-1) Error of detector efficiency 2%, 2296900600007 (ERR-2,1.,2.) Error of number of target nuclei 1 - 2%, 2296900600008 (MONIT-ERR,1.,2.) Error of cross-sections of 2296900600009 reference reactions(1 - 2%), 2296900600010 (ERR-3) Error of summing coincidence effects (6%) 2296900600011 (ERR-4,1.,2.) Error of self-absorption 2296900600012 coefficients (1 - 2%). 2296900600013 STATUS (TABLE) Data received from R.Vlastou 8.04.2009. Data 2296900600014 are presented on Fig.1 of J.Rad.Nucl.Chem.272(2007)219 2296900600015 and on Fig.3 of C,2007NICE,1,471,2007. 2296900600016 HISTORY (20090408A) M.M. Digitized data were replaced by 2296900600017 authors' data. 2296900600018 (20110226A) SD: Units in DATA changed: B => MB; 2296900600019 EN-ERR multiplied on 10. DATA-ERR => ERR-T 2296900600020 ERR-ANALYS and COMMON section added. 2296900600021 (20180831U) SD: ERR-2 -> ERR-3 in COMMON section. 2296900600022 ENDBIB 20 0 2296900600023 COMMON 2 3 2296900600024 ERR-1 ERR-3 2296900600025 PER-CENT PER-CENT 2296900600026 2. 6. 2296900600027 ENDCOMMON 3 0 2296900600028 DATA 4 4 2296900600029 EN EN-ERR DATA ERR-T 2296900600030 MEV MEV MB MB 2296900600031 9.60 0.05 0.30 0.1 2296900600032 10.60 0.05 0.70 0.1 2296900600033 11.10 0.04 0.90 0.1 2296900600034 11.40 0.04 1.10 0.1 2296900600035 ENDDATA 6 0 2296900600036 ENDSUBENT 35 0 2296900699999 SUBENT 22969007 20121016 22332296900700001 BIB 8 19 2296900700002 REACTION (72-HF-176(N,2N)72-HF-175,,SIG) 2296900700003 DECAY-DATA (72-HF-175,70.D,DG,343.) 2296900700004 SAMPLE Natural Hf. Hf-176 Abundance (5.26+-0.07)%. 2296900700005 ERR-ANALYS (DATA-ERR) Experimental error 2296900700006 CRITIQUE See FLAG 2296900700007 FLAG (1.) Prof.R.Vlastou: at higher energies it grows 2296900700008 rapidly to about 20% due to the parasitic neutrons of 2296900700009 the beam. So the values given in EXFOR at 11.1 2296900700010 and 11.4 MeV should not be trusted. 2296900700011 STATUS (PRELM) Data are preliminary. New experiment in process2296900700012 (TABLE) Data from Prof.R.Vlastou 2296900700013 (SPSDD,23184003) Superseded according to comment of 2296900700014 R.Vlastou. 2296900700015 HISTORY (20090408A) M.M. Units in data were corrected according2296900700016 to the comment of R.Vlastou : MB -> B . 2296900700017 (20110226A) SD: Units in data were corrected according 2296900700018 to the comment of R.Vlastou : B => MB; values for 2296900700019 DATA-ERR of two first points added. COMMON deleted. 2296900700020 FLAG added. See comments from author at FLAG. 2296900700021 ENDBIB 19 0 2296900700022 NOCOMMON 0 0 2296900700023 DATA 4 4 2296900700024 EN DATA DATA-ERR FLAG 2296900700025 MEV MB MB NO-DIM 2296900700026 8.80 398. 26. 2296900700027 9.60 886. 59. 2296900700028 11.10 1460. 96. 1. 2296900700029 11.40 2320. 147. 1. 2296900700030 ENDDATA 6 0 2296900700031 ENDSUBENT 30 0 2296900799999 SUBENT 22969008 20180831 22702296900800001 BIB 7 25 2296900800002 REACTION (32-GE-76(N,2N)32-GE-75,,SIG) G+M total c-s. 2296900800003 SAMPLE Natural Ge. 2296900800004 DECAY-DATA (32-GE-75-G,82.78MIN,DG,264.6) 1/2-. 2296900800005 (32-GE-75-M,47.7SEC) 7/2+. Isomeric transition 0.9997. 2296900800006 CORRECTION To estimate the neutron background contribution to the 2296900800007 activation of Ge-75 via Ge-74(n,gamma)Ge-75 reaction 2296900800008 and to made appropriate corrections, an irradiation was2296900800009 performed just below the (n,2n) reaction threshold, 2296900800010 where the product radioactivity was expected to derive 2296900800011 only from the disturbing (n,gamma) reaction. 2296900800012 ERR-ANALYS (ERR-T) Total error 2296900800013 (ERR-1) Error of detector efficiency 2%, 2296900800014 (ERR-2,1.,2.) Error of number of target nuclei 1 - 2%, 2296900800015 (MONIT-ERR,1.,2.) Error of cross-sections of 2296900800016 reference reactions(1 - 2%), 2296900800017 (ERR-3) Error of summing coincidence effects (6%) 2296900800018 (ERR-4,1.,2.) Error of self-absorption 2296900800019 coefficients (1 - 2%). 2296900800020 STATUS (TABLE) Data received from R.Vlastou 8.04.2009. 2296900800021 Data are presented on Fig.4 of C,2007NICE,1,471,2007, 2296900800022 and on Fig.1 of S,AIP-1090,627,2009. 2296900800023 HISTORY (20110226A) SD: Units in DATA changed: B => MB 2296900800024 EN-ERR multiplied on 10. 2296900800025 ERR-ANALYS and COMMON section added. 2296900800026 (20180831U) SD: ERR-2 -> ERR-3 in COMMON section. 2296900800027 ENDBIB 25 0 2296900800028 COMMON 2 3 2296900800029 ERR-1 ERR-3 2296900800030 PER-CENT PER-CENT 2296900800031 2. 6. 2296900800032 ENDCOMMON 3 0 2296900800033 DATA 4 4 2296900800034 EN EN-ERR DATA ERR-T 2296900800035 MEV MEV MB MB 2296900800036 9.60 0.05 2.2 0.3 2296900800037 10.60 0.05 345. 45. 2296900800038 11.10 0.04 410. 48. 2296900800039 11.40 0.04 452. 51. 2296900800040 ENDDATA 6 0 2296900800041 ENDSUBENT 40 0 2296900899999 ENDENTRY 8 0 2296999999999