ENTRY 23064 20211106 23052306400000001 SUBENT 23064001 20211106 23052306400100001 BIB 16 96 2306400100002 TITLE Solving the stellar Ni-62 problem with AMS. 2306400100003 AUTHOR (I.Dillmann, T.Faestermann, G.Korschinek, J.Lachner, 2306400100004 M.Maiti, M.Poutivtsev, G.Rugel, S.Walter, F.Kaeppeler, 2306400100005 M.Erhard, A.R.Junghans, C.Nair, R.Schwengner, A.Wagner,2306400100006 U.Giesen,J.Goerres,M.Heil,S.Horn,S.Koechli,J.Marganiec,2306400100007 J.Neuhausen,R.Nolte, R.Reifarth,D.Schumann,E.Uberseder,2306400100008 F.Voss,M.Wiescher) 2306400100009 INSTITUTE (2GERGSI) C.Domingo-Pardo,M.Heil,R.Reifarth. 2306400100010 (2GERKFK) C.Domingo-Pardo,I.Dillmann,F.Kaeppeler, 2306400100011 J.Marganiec,F.Voss,S.Walter, M.Erhard, A.R.Junghans, 2306400100012 C.Nair, R.Schwengner, A.Wagner. 2306400100013 (2GERMUN) L.Dillmann,T.Faestermann,G.Korschinek, 2306400100014 J.Lachner, M.Maiti,M.Poutivtsev,R.Rugel. 2306400100015 (2GERPTB) U.Giesen,R.Nolte. 2306400100016 (1USANOT) J.Goerres,E.Uberseder,M.Wiescher. 2306400100017 (2SWTPSI) S.Horn,S.Koechli,J.Neuhausen,D.Schumann. 2306400100018 REFERENCE (J,NIM/B,268,1283,2010) First author I.Dillmann. 2306400100019 #doi:10.1016/j.nimb.2009.10.153 2306400100020 Online from 9 Oct.2009. 2306400100021 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2306400100022 cross sections. 2306400100023 ((T,Walter,2008)=(R,FZKA-7411,2008)) Author S.Walter. 2306400100024 Title: The stellar cross sections of Ni-62 and Ni-63 2306400100025 -experimental investigations using the activation 2306400100026 technique and time of flight method. 2306400100027 (S,AIP-1090,230,2009) First author C.Domingo-Pardo. 2306400100028 REL-REF (I,,W.Ratynski+,J,PR/C,37,595,1988) 2306400100029 Details of neutron source. 2306400100030 FACILITY (VDG,2GERKFK) 3.7 MV Van de Graaff accelerator. 2306400100031 SAMPLE Two samples enriched in Ni-62 2306400100032 1) 94.4 mg mass, 2306400100033 Ni-58 -2.3%, Ni-60 -1.6%, Ni-61 -0.9%, Ni-62 -95.0%, 2306400100034 Ni-64 -0.2%. Impurities: Ca - 800 ppm, Mg <10ppm, 2306400100035 Si <50ppm, Fe -200ppm, Cu <10ppm, Al -150ppm, 2306400100036 Zn <10ppm, B <1ppm, Ti <10ppm, Mn -10ppm, Cr -30ppm, 2306400100037 Sn <10ppm, Co <10ppm, As <1ppm, W <50ppm, Pb <10ppm. 2306400100038 2) 100.9 mg mass, 2306400100039 Ni-58 -1.05%, Ni-60 -1.22%, Ni-61 -0.350%, 2306400100040 Ni-62 -97.3%, Ni-64 -0.1%. Impurities: Na - 0.002%, 2306400100041 Mg -0.005%, Si -0.005%, K -0.001%, Ca -0.002%, 2306400100042 Fe -0.003%, Cu -0.002, Cd -0.001%, Pb -0.003%. 2306400100043 Between two Au foils used as neutron flux monitor. 2306400100044 INC-SOURCE (P-LI7) Protons of energy 1912 keV (+-1%). 30 um 2306400100045 thick layers of metallic Li ON Water-cooled Cu backing.2306400100046 INC-SPECT Exp. incident neutron spectrum ( range En < 118 keV) 2306400100047 is given on Fig.3.1 of reference T,Walter, fitted by 2306400100048 Maxwellian one of kT=(25 +- 0.5) keV. Neutron flux is 2306400100049 kinematically collimated in a forward cone of 120 deg 2306400100050 opening angle. Neutron scattering through Cu backing 2306400100051 is negligible since the transmission is about 98.%. 2306400100052 Mean neutron flux over activation was (1-2)*10**9 1/sec2306400100053 at sample position. 2306400100054 METHOD (ACTIV) Neutron activation of quasi-stellar 25 keV 2306400100055 neutron spectrum. Samples, blank samples and standards 2306400100056 were measured several times. 2306400100057 (AMS) Accelerator mass spectrometry by the gas-filled 2306400100058 analyzing magnet system at Maier-Leibnitz Lab. to 2306400100059 determine the number of activated Ni-63 nuclei. 2306400100060 Isotopic background can be reduced down to negligible 2306400100061 level by using Wien filter and concomitant TOF 2306400100062 measurement. 2306400100063 To suppress the isobaric Cu-63 background component- 2306400100064 the technique based on Gas Filled dipole Magnet System 2306400100065 and multi differential energy-loss and position 2306400100066 sensitive ionization chamber was developed at MLL. 2306400100067 Sensitivity of 3.E-13 was achieved. 2306400100068 Ratio of numbers of atoms Ni-63/Ni-62 for 1st sample 2306400100069 (6.0+-1.7)*10**-11, for 2nd sample (5.1+-1.3)*10**-11.2306400100070 DETECTOR (GLASD) Li-6-glass or ZnS detectors for relative 2306400100071 neutron flux measurement. 2306400100072 (HPGE) HPGe detectors, covered by 5 cm Pb, 5mm Cu. 2306400100073 Fig.3.12 presents the energy dependence of detector 2306400100074 efficiency, defined by gold foils. 2306400100075 Efficiency (2.00 +- 0.04) % for 411.8 keV of Au-198. 2306400100076 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2306400100077 DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 2306400100078 CORRECTION For self-absorption. 2306400100079 Correction of the number of nuclei decayed during the 2306400100080 activation - important for short-lived Au-198 isotope, 2306400100081 negligible for very long half-lives. 2306400100082 ADD-RES Ni64(n,gamma)Ni-63 reaction cross-section was 2306400100083 measured, no values are given. 2306400100084 HISTORY (20090624C) M.M. 2306400100085 (20100505A) Volume and page numbers were added in 2306400100086 Reference J,NIM/B. 2306400100087 (20150420U) M.M. Ref. R,FZKA-7411,2008 was added. 2306400100088 (20190320U) SD: Pointers at TITLE and REFERENCE deleted2306400100089 (not useful). Second title put under its ref. 2306400100090 (20200909A) SD: Correction in Subent 005. Pointers at 2306400100091 FACILITY, METHOD, etc. deleted (not useful). Second 2306400100092 facility deleted (used only for AMS). 2306400100093 (20211106A) SD: Corrections in all Subents. 2306400100094 Subents 006-008 added. Subent 005 deleted (comment 2306400100095 from INDC(GER)-0053: This data set is a mixture of the 2306400100096 activations and time-of-flight measurements, and should2306400100097 be deleted from EXFOR). 2306400100098 ENDBIB 96 0 2306400100099 NOCOMMON 0 0 2306400100100 ENDSUBENT 99 0 2306400199999 SUBENT 23064002 20211106 23052306400200001 BIB 9 18 2306400200002 REACTION (28-NI-62(N,G)28-NI-63,,SIG,,SPA) 2306400200003 Primary experimental c-s for two samples measured in 2306400200004 quasi-Maxwellian spectrum of kT=25+-0.5 keV. 2306400200005 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 2306400200006 DECAY-DATA (79-AU-198,,DG,411.8,0.9558) (95.58+-0.12)%. 2306400200007 MISC-COL (MISC1) Irradiation time. 2306400200008 (MISC2) Total neutron exposures (neutrons). 2306400200009 (MISC3) Resulting isotopes ratio Ni-63/Ni-62. 2306400200010 ANALYSIS Obtained directly from isotopic ratio divided by total2306400200011 neutron exposure. 2306400200012 CORRECTION Counts of mass 63 from blank sample correspond to 2306400200013 isotope ratio Ni-63/Ni-62 =3.0E-13, smaller than 2306400200014 uncertainties - did not correct for that. 2306400200015 ERR-ANALYS (DATA-ERR) Quoted errors are from AMS measurement only.2306400200016 (MONIT-ERR) Uncertainty in monitor raction 2306400200017 STATUS (TABLE) Table 1 from Nucl.Instr.Meth.,B268(2010)1283 2306400200018 (SPSDD,23064006) Renormalized. 2306400200019 HISTORY (20211106A) SD: Subent superseded. KT -> KT-DUMMY. 2306400200020 ENDBIB 18 0 2306400200021 COMMON 4 3 2306400200022 KT-DUMMY KT-ERR MONIT MONIT-ERR 2306400200023 KEV KEV MB MB 2306400200024 25.0 0.5 586. 8. 2306400200025 ENDCOMMON 3 0 2306400200026 DATA 6 2 2306400200027 DATA DATA-ERR MISC1 MISC2 MISC3 MISC3-ERR 2306400200028 MB MB D NO-DIM NO-DIM NO-DIM 2306400200029 34.8 9.8 10.2 1.735E+15 6.0E-11 1.7E-112306400200030 22.6 5.6 10.3 2.312E+15 5.1E-11 1.3E-112306400200031 ENDDATA 4 0 2306400200032 ENDSUBENT 31 0 2306400299999 SUBENT 23064003 20211106 23052306400300001 BIB 5 9 2306400300002 REACTION (28-NI-62(N,G)28-NI-63,,SIG,,SPA) 2306400300003 ANALYSIS Weighted experimental cross-section in the 2306400300004 quasi-Maxwellian neutron spectrum was obtained from two2306400300005 primary measured. 2306400300006 ERR-ANALYS (DATA-ERR) Quoted errors are from AMS measurement only.2306400300007 STATUS (TABLE) Table 1 from Nucl.Instr.Meth.,B268(2010)1283 2306400300008 (DEP,23064002) 2306400300009 (SPSDD,23064007) Renormalized. 2306400300010 HISTORY (20211106A) SD: Subent superseded. KT -> KT-DUMMY. 2306400300011 ENDBIB 9 0 2306400300012 NOCOMMON 0 0 2306400300013 DATA 4 1 2306400300014 KT-DUMMY KT-ERR DATA DATA-ERR 2306400300015 KEV KEV MB MB 2306400300016 25. 0.5 25.2 4.9 2306400300017 ENDDATA 3 0 2306400300018 ENDSUBENT 17 0 2306400399999 SUBENT 23064004 20211106 23052306400400001 BIB 6 13 2306400400002 REACTION (28-NI-62(N,G)28-NI-63,,SIG,,MXW) 2306400400003 ERR-ANALYS (DATA-ERR) Not specified. 2306400400004 ANALYSIS Weighted exp.cross section in quasi-Maxwellian spectrum2306400400005 was transformed into a true Maxwellian one. Details are2306400400006 given in REL-REF of W.Ratynski+,J,PR/C,37,595,1988. 2306400400007 REL-REF (A,22959002,H.Nassar+,J,PRL,94,092504,2005) 2306400400008 Agree with value of H.Nassar+ - 23.9 +- 2.4 mb. 2306400400009 STATUS (TABLE) Text, page 43 from FZKA-7411; 2306400400010 Text, page 233 from AIP-1090,230; Abstract and 2306400400011 chapter IIIA from Nucl.Instr.Meth.,B268(2010)1283 2306400400012 (DEP,23064003) 2306400400013 (SPSDD,23064008) Renormalized. 2306400400014 HISTORY (20211106A) SD: Subent superseded. 2306400400015 ENDBIB 13 0 2306400400016 NOCOMMON 0 0 2306400400017 DATA 3 1 2306400400018 KT DATA DATA-ERR 2306400400019 KEV MB MB 2306400400020 30. 23.4 4.6 2306400400021 ENDDATA 3 0 2306400400022 ENDSUBENT 21 0 2306400499999 NOSUBENT 23064005 20211106 23052306400500001 SUBENT 23064006 20211106 23052306400600001 BIB 7 18 2306400600002 REACTION (28-NI-62(N,G)28-NI-63,,SIG,,SPA) 2306400600003 Primary experimental c-s for two samples measured in 2306400600004 quasi-Maxwellian spectrum of kT=25+-0.5 keV. 2306400600005 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2306400600006 ANALYSIS Obtained directly from isotopic ratio divided by total2306400600007 neutron exposure. 2306400600008 Measured quantity at kT=25 keV: cross section ratio 2306400600009 63Ni/197Au = 0.0456+-0.0156 2306400600010 Cross section value in Subent 23064.002 is 2306400600011 renormalized for new gold cross section 2306400600012 CORRECTION Counts of mass 63 from blank sample correspond to 2306400600013 isotope ratio Ni-63/Ni-62 =3.0E-13, smaller than 2306400600014 uncertainties - did not correct for that. 2306400600015 Correction for revised gold standard: 622.7/586 =1.0622306400600016 ERR-ANALYS (DATA-ERR) Quoted errors are from AMS measurement only.2306400600017 (MONIT-ERR) Uncertainty in monitor raction 2306400600018 STATUS (TABLE) Table from p.313 of INDC(GER)-0053 2306400600019 HISTORY (20211106C) SD 2306400600020 ENDBIB 18 0 2306400600021 COMMON 4 3 2306400600022 KT-DUMMY KT-ERR MONIT MONIT-ERR 2306400600023 KEV KEV MB MB 2306400600024 25.0 0.5 622.7 6. 2306400600025 ENDCOMMON 3 0 2306400600026 DATA 2 2 2306400600027 DATA DATA-ERR 2306400600028 MB MB 2306400600029 37.0 10.2 2306400600030 24.0 5.6 2306400600031 ENDDATA 4 0 2306400600032 ENDSUBENT 31 0 2306400699999 SUBENT 23064007 20211106 23052306400700001 BIB 7 14 2306400700002 REACTION 1((28-NI-62(N,G)28-NI-63,,SIG,,SPA)/ 2306400700003 (79-AU-197(N,G)79-AU-198,,SIG,,SPA)) 2306400700004 2(28-NI-62(N,G)28-NI-63,,SIG,,SPA) 2306400700005 ANALYSIS Weighted experimental cross-section in the 2306400700006 quasi-Maxwellian neutron spectrum was obtained from two2306400700007 primary measured. 2306400700008 Cross section value in Subent 23064.003 is 2306400700009 renormalized for new gold cross section 2306400700010 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2306400700011 CORRECTION Correction for revised gold standard: 622.7/586 =1.0622306400700012 ERR-ANALYS (DATA-ERR) Quoted errors are from AMS measurement only.2306400700013 STATUS (TABLE) Table from p.314 of INDC(GER)-0053 2306400700014 (DEP,23064002) 2306400700015 HISTORY (20211106C) SD 2306400700016 ENDBIB 14 0 2306400700017 NOCOMMON 0 0 2306400700018 DATA 6 1 2306400700019 KT-DUMMY KT-ERR DATA 1DATA-ERR 1DATA 2DATA-ERR 22306400700020 KEV KEV NO-DIM NO-DIM MB MB 2306400700021 25. 0.5 0.0430 0.0084 26.8 5.2 2306400700022 ENDDATA 3 0 2306400700023 ENDSUBENT 22 0 2306400799999 SUBENT 23064008 20211106 23052306400800001 BIB 8 15 2306400800002 REACTION (28-NI-62(N,G)28-NI-63,,SIG,,MXW) 2306400800003 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2306400800004 ANALYSIS Weighted exp.cross section in quasi-Maxwellian spectrum2306400800005 was transformed into a true Maxwellian one. Details are2306400800006 given in REL-REF of W.Ratynski+,J,PR/C,37,595,1988. 2306400800007 Cross section value in Subent 23064.004 is 2306400800008 renormalized for new gold cross section 2306400800009 CORRECTION Correction for revised gold standard: 611.6/582 =1.0512306400800010 REL-REF (A,22959002,H.Nassar+,J,PRL,94,092504,2005) 2306400800011 Agree with value of H.Nassar+ - 23.9 +- 2.4 mb. 2306400800012 ERR-ANALYS (DATA-ERR) Not specified. 2306400800013 (MONIT-ERR) Uncertainty in monitor raction 2306400800014 STATUS (TABLE) Table from p.315 of INDC(GER)-0053 2306400800015 (DEP,23064003) 2306400800016 HISTORY (20211106C) SD 2306400800017 ENDBIB 15 0 2306400800018 NOCOMMON 0 0 2306400800019 DATA 5 1 2306400800020 KT DATA DATA-ERR MONIT MONIT-ERR 2306400800021 KEV MB MB MB MB 2306400800022 30. 24.6 4.8 611.6 6. 2306400800023 ENDDATA 3 0 2306400800024 ENDSUBENT 23 0 2306400899999 ENDENTRY 8 0 2306499999999