ENTRY O1016 20200213 O076O101600000001 SUBENT O1016001 20200213 O076O101600100001 BIB 15 75 O101600100002 TITLE Cross section data for the production of the positron O101600100003 emitting niobium isotope Nb-90 via the Zr-90(p,n) O101600100004 reaction O101600100005 AUTHOR (S.Busse, F.Rosch, S.M.Qaim) O101600100006 INSTITUTE (2GERMNZ) O101600100007 (2GERJUL) Institut fuer Nuklearchemie O101600100008 REFERENCE (J,RCA,90,1,2002) O101600100009 REL-REF (M,B0124001,S.M.Qaim+,J,ARI,28,947,1977) Details of O101600100010 experiments. O101600100011 FACILITY (CYCLO,2GERJUL) The Julich compact cyclotron CV-28. O101600100012 METHOD (STTA) O101600100013 (ACTIV) Each stack was irradiated for 30 minutes at a O101600100014 beam current of 100 nano-Ampere. O101600100015 (BCINT) The proton beam current was measured directly O101600100016 using a Faraday cup as well as indirectly via the O101600100017 Cu-63(p,n)Zn-63 reaction. At low intensity the proton O101600100018 flux measured via the two techniques differed O101600100019 considerably. The authors therefore put more reliance O101600100020 on the monitor reaction. O101600100021 (GSPEC) With respect to cross section measurements, O101600100022 counting was performed only over two days after each O101600100023 irradiation, and attention was paid exclusively to the O101600100024 short-lived niobium isotopes 90-Nb, 89-Nb and 89-m-Nb. O101600100025 Apart from the activity of the mentioned isotopes the O101600100026 activity of the monitor reaction products 62-Zn and O101600100027 63-Zn was also determined. O101600100028 SAMPLE In the case of natural Zr samples for cross section O101600100029 measurements were prepared by cutting pieces of 13-mm O101600100030 diameter out of a 10-mum thick metal foil. O101600100031 For thick target yield measurements discs of 250-mm O101600100032 thickness were cut out of a large sized metal foil. O101600100033 A homogeneous and mechanically stable Zr-90-O(2) O101600100034 samples of thickness in the order of 5-6 mg/cm**2 was O101600100035 thus obtained on the surface of the copper backing O101600100036 foil. To avoid contamination, the surface of each O101600100037 samples was covered with a 10-mum thick Al foil, O101600100038 having the same diameter of 13-mm as the Cu backing O101600100039 foil. O101600100040 ADD-RES Method to prepare enriched target of Zr-90. O101600100041 DETECTOR (GELI,HPGE) O101600100042 MONITOR (29-CU-63(P,N)30-ZN-63,,SIG) O101600100043 The ratio of cross section (p,2n)/(p,n) was used to O101600100044 control the proton energy. O101600100045 MONIT-REF (,F.Tarkanyi+,R,IAEA-TECDOC-1211,47,2001) Chapter 4 O101600100046 DECAY-MON (30-ZN-63,38.1MIN,DG,669.8,0.084,DG,962.6,0.066) O101600100047 ERR-ANALYS The overall uncertainty in each cross section (ERR-T) O101600100048 was obtained by taking the square root of the sum of O101600100049 the squares of the individual uncertainties, which wereO101600100050 considered to be as follows: O101600100051 (ERR-1) target mass ~ 2%. O101600100052 (ERR-2,5.,10.) Inhomogeneity in target thickness-5%-10%O101600100053 (ERR-S,2.,10.) Statistical errors-2-10%, for energy O101600100054 point near the threshold up to 20%. O101600100055 (ERR-3) Detector efficiency and sample-detector O101600100056 geometry approx. 6%. O101600100057 (ERR-4,,3.) Decay data errors less 3%. O101600100058 (ERR-5,8.,10.) Bombarding proton beam intensity 8-10%. O101600100059 (ERR-6,,7.) uncertainty of the dead time O101600100060 For the Zr-90(p,n) reaction the overall error in cross O101600100061 section amounts to 15 to 20%. The primary proton energyO101600100062 had an error of +-0.2-MeV. The proton energy O101600100063 degradation in each stack foil or Zr-90-O(2) sample O101600100064 was calculated and its half-value was combined with theO101600100065 uncertainty of the primary energy. The uncertainty in O101600100066 the effective energy of the front foil was estimated toO101600100067 be 0.3-MeV. Due to propagation of error it increased O101600100068 to 0.7-MeV in the sixth foil of a stack. O101600100069 HISTORY (20021204C) O101600100070 (20021229U) Last checking has been done. O101600100071 (20151204A) SD: DECAY-DATA corrected in Subent 005. O101600100072 ERR-ANALYS update. O101600100073 (20160804A) SD: REACTION code corrected in O101600100074 Subents 002,003. All corrections were made following O101600100075 N.Otsuka comments. O101600100076 (20200213U) SD: DECAY-MON, MONITOR corrected. O101600100077 ENDBIB 75 0 O101600100078 COMMON 2 3 O101600100079 ERR-1 ERR-3 O101600100080 PER-CENT PER-CENT O101600100081 2. 6. O101600100082 ENDCOMMON 3 0 O101600100083 ENDSUBENT 82 0 O101600199999 SUBENT O1016002 20160804 O058O101600200001 BIB 7 13 O101600200002 REACTION (40-ZR-90(P,N)41-NB-90-G,M+,SIG) O101600200003 SAMPLE (40-ZR-90,NAT=0.5145) Natural zirconium target used. O101600200004 DECAY-DATA (41-NB-90-G,14.6HR,DG,1129.1,0.92,DG,2319.1,0.828, O101600200005 DG,141.2,0.69) O101600200006 MISC-COL (MISC) Thickness of the target O101600200007 ERR-ANALYS (ERR-T) The total uncertainty. O101600200008 Analysis see in first Subent. O101600200009 (EN-ERR) Proton beam energy uncertainty. O101600200010 STATUS (TABLE) Table 2 of Radiochim.Acta.90(2002)1 O101600200011 HISTORY (20160804A) SD: SF1=Zr-0 -> Zr-90 in REACTION code. O101600200012 Nb-90m deleted from DECAY-DATA (not used for derivationO101600200013 of the compiled data set). THICHNESS -> MISC (thicknessO101600200014 not an independent variable in this case). STATUS addedO101600200015 ENDBIB 13 0 O101600200016 NOCOMMON 0 0 O101600200017 DATA 5 16 O101600200018 EN EN-ERR DATA ERR-T MISC O101600200019 MEV MEV MB MB G/CM-SQ O101600200020 15.3 0.3 859. 123. 0.0075 O101600200021 14.3 0.4 816. 148. 0.0072 O101600200022 13.5 0.4 797. 125. 0.0072 O101600200023 13.2 0.4 809. 121. 0.0075 O101600200024 12.6 0.5 749. 137. 0.0072 O101600200025 12.3 0.4 763. 131. 0.0072 O101600200026 11.6 0.6 728. 111. 0.0071 O101600200027 11.3 0.4 724. 129. 0.0072 O101600200028 11.1 0.3 640. 115. 0.0076 O101600200029 10.6 0.7 647. 110. 0.0072 O101600200030 10.3 0.5 650. 127. 0.0072 O101600200031 10. 0.4 590. 105. 0.0076 O101600200032 9.1 0.6 524. 95. 0.0071 O101600200033 8.8 0.4 408. 105. 0.0074 O101600200034 7.9 0.7 292. 70. 0.0072 O101600200035 7.5 0.5 132. 31. 0.0075 O101600200036 ENDDATA 18 0 O101600200037 ENDSUBENT 36 0 O101600299999 SUBENT O1016003 20160804 O058O101600300001 BIB 6 10 O101600300002 REACTION (40-ZR-90(P,N)41-NB-90,,TTY,,EOB/A) O101600300003 SAMPLE Natural Zr target was used. O101600300004 ADD-RES (TTY-C) Activity yields for natural zirconium and O101600300005 enriched Zr-90, for pure metal and oxide. O101600300006 COMMENT Frank Roesch (2016-09-09): The yield for O101600300007 an 1-hour irradiation is given. O101600300008 STATUS (TABLE) Table 3 of Radiochim.Acta.90(2002)1 O101600300009 HISTORY (20160804A) SD: SF1=Zr-0 -> Zr-90; SF8=DT -> EOB/A O101600300010 in REACTION code. Units MBQ/MUAHR -> MBQ/MUA; O101600300011 TIME-IRRD was added. COMMENT, STATUS added. O101600300012 ENDBIB 10 0 O101600300013 COMMON 1 3 O101600300014 TIME-IRRD O101600300015 HR O101600300016 1. O101600300017 ENDCOMMON 3 0 O101600300018 DATA 3 5 O101600300019 EN-MAX EN-MIN DATA O101600300020 MEV MEV MBQ/MUA O101600300021 17.6 15. 128. O101600300022 17.6 8.1 330. O101600300023 15. 11.9 120. O101600300024 15. 8.1 202. O101600300025 11.9 8.1 82. O101600300026 ENDDATA 7 0 O101600300027 ENDSUBENT 26 0 O101600399999 SUBENT O1016004 20021229 0000O101600400001 BIB 5 18 O101600400002 REACTION (40-ZR-90(P,N)41-NB-90,,SIG) O101600400003 SAMPLE Enriched Zr-90-O(2) target was used. O101600400004 For irradiations at proton energies above 12-MeV, O101600400005 isotopically enriched Zr-90 was used. O101600400006 The isotopic composition in this case was- O101600400007 Zr-90 -99.22%, O101600400008 Zr-91 -0.39%, O101600400009 Zr-92 -0.29%, O101600400010 Zr-94 -0.15%, O101600400011 Zr-96 -0.01%. O101600400012 RAD-DET (41-NB-90-G,DG) O101600400013 DECAY-DATA (41-NB-90-G,14.6HR,DG,1129.1,0.92,DG,2319.1,0.828, O101600400014 DG,141.2,0.69) O101600400015 (41-NB-90-M,18.8SEC,DG,122.4,0.642) 100% isomer O101600400016 transition O101600400017 ERR-ANALYS (ERR-T).The uncertainty is given in data table. O101600400018 Analysis see in first subent. O101600400019 (EN-ERR). Proton beam energy uncertainty. O101600400020 ENDBIB 18 0 O101600400021 NOCOMMON 0 0 O101600400022 DATA 5 12 O101600400023 EN EN-ERR DATA ERR-T THICKNESS O101600400024 MEV MEV MB MB G/CM-SQ O101600400025 19. 0.3 243. 41. 0.0059 O101600400026 18.4 0.3 271. 43. 0.0056 O101600400027 17.8 0.3 352. 63. 0.0056 O101600400028 17.2 0.3 460. 86. 0.005 O101600400029 16.6 0.3 556. 93. 0.0055 O101600400030 16. 0.3 617. 98. 0.0057 O101600400031 15.5 0.3 743. 111. 0.0059 O101600400032 14.9 0.3 791. 144. 0.0056 O101600400033 14.2 0.4 771. 125. 0.0056 O101600400034 13.5 0.3 876. 152. 0.005 O101600400035 12.8 0.4 826. 132. 0.0055 O101600400036 12. 0.6 808. 125. 0.0056 O101600400037 ENDDATA 14 0 O101600400038 ENDSUBENT 37 0 O101600499999 SUBENT O1016005 20151205 O056O101600500001 BIB 6 12 O101600500002 REACTION 1(40-ZR-90(P,2N)41-NB-89-M,,SIG) O101600500003 2(40-ZR-90(P,2N)41-NB-89-G,,SIG) O101600500004 SAMPLE Enriched Zr-90-O(2) target was used. O101600500005 DECAY-DATA1(41-NB-89-M,66.MIN,DG,588.,0.995,DG,507.4,0.85) O101600500006 2(41-NB-89-G,2.HR,DG,1833.4,0.032,DG,1727.,0.03, O101600500007 DG,920.5,0.014) O101600500008 MISC-COL (MISC) Thickness of target O101600500009 ERR-ANALYS (ERR-T).The uncertainty is given in data table. O101600500010 Analysis see in first Subent. O101600500011 (EN-ERR). Proton beam energy uncertainty. O101600500012 HISTORY (20151203A) SD: Nb-90g -> Nb-89g in DECAY-DATA (2). O101600500013 Col.THICKNESS -> MISC (not an independent variable) O101600500014 ENDBIB 12 0 O101600500015 NOCOMMON 0 0 O101600500016 DATA 7 4 O101600500017 EN EN-ERR DATA 1ERR-T 1DATA 2ERR-T 2O101600500018 MISC O101600500019 MEV MEV MB MB MB MB O101600500020 G/CM-SQ O101600500021 19. 0.3 67. 15. 91. 40.O101600500022 0.0059 O101600500023 18.4 0.3 43. 10. 64. 32.O101600500024 0.0056 O101600500025 17.8 0.3 23. 6. 43. 26.O101600500026 0.0056 O101600500027 17.2 0.3 9. 3. O101600500028 0.005 O101600500029 ENDDATA 12 0 O101600500030 ENDSUBENT 29 0 O101600599999 ENDENTRY 5 0 O101699999999