ENTRY 22879 20211007 23042287900000001 SUBENT 22879001 20211007 23042287900100001 BIB 16 63 2287900100002 TITLE Neutron capture cross section of La-139 2287900100003 AUTHOR (S.O'Brien,S.Dababneh,M.Heil,F.Kaeppeler,R.Plag, 2287900100004 R.Reifarth,R.Gallino,M.Pignatari) 2287900100005 INSTITUTE (2GERKFK,1USALAS,2ITYTUR) 2287900100006 REFERENCE (J,PR/C,68,035801,2003) Main reference, data given 2287900100007 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2287900100008 cross sections. 2287900100009 FACILITY (VDG,2GERKFK) 3.7 MV Van de Graaff accelerator 2287900100010 METHOD (ACTIV,STTA) 2287900100011 MONITOR ((MONIT)79-AU-197(N,G)79-AU-198,,SIG,,SPA) 2287900100012 INC-SOURCE (P-LI7) The neutron spectrum was produced via the 2287900100013 Li-7(p,n)Be-7 reaction by bombarding a 30-mum thick 2287900100014 Li-target of 6-mm diameter with protons of 1911-keV, 2287900100015 30-keV above the reaction threshold. 2287900100016 DETECTOR (HPGE) A 39-cm3 high-purity Ge-detector. 2287900100017 (GLASD) A Li-6 glass detector for monitoring of the 2287900100018 neutron flux variations. 2287900100019 PART-DET (G,N) 2287900100020 INC-SPECT The resulting neutron spectrum is a continuous 2287900100021 distribution in neutron energy and has a high energy 2287900100022 cutoff at E(n)=106-keV. The reaction kinematics 2287900100023 restrict the emitted neutrons to a forward cone with 2287900100024 an opening angle of 120-degree. 2287900100025 SAMPLE The samples were 7-mm diameter disks that were cut 2287900100026 from a metallic lanthanum foil of natural composition.2287900100027 The use of an additional lanthanum oxide sample was 2287900100028 turned down, since the La(2)O(3) and La((OH)3) from 2287900100029 white powders, which makes it difficult to define the 2287900100030 stoichiometry and thus the mass of lanthanum in sample2287900100031 Therefore, the sample was polished and stored in an 2287900100032 argon atmosphere in order to remove and prevent 2287900100033 surface impurities. 2287900100034 The sample was sandwiched between two gold foils. 2287900100035 Summary of irradiation parameters- 2287900100036 activation mass irradiation time measuring time 2287900100037 mg hour hour 2287900100038 La1 12.40 22. 24. 2287900100039 La2 11.92 47. 10. 2287900100040 La3 12.63 17. 22. 2287900100041 CORRECTION Corrections were made for gamma-ray self-absorption. 2287900100042 The summing correction factor for each gamma 2287900100043 transition was obtained by comparing the intensity of 2287900100044 the line in the monoenergetic simulated spectrum to 2287900100045 that in the complex decay spectrum. 2287900100046 Corrections for the variation of the neutron flux and 2287900100047 corrects for the decay during activation. 2287900100048 ADD-RES (THEO) Results the s- and r-process components could 2287900100049 be more accurately determined, making lanthanum a 2287900100050 reliable s- and r-process indicator in stellar 2287900100051 spectroscopy. 2287900100052 ERR-ANALYS (ERR-T) Total error 2287900100053 (ERR-1) Error in sample thickness for lanthanum 2287900100054 (ERR-S) Error in counting statistics for lanthanum 2287900100055 (ERR-2,,0.3) Error in self-absorption for lanthanum 2287900100056 (ERR-3) Error in the detector efficiency for lanthanum 2287900100057 (ERR-4) Error in the gamma-ray intensity per decay 2287900100058 for lanthanum 2287900100059 (ERR-5) Error in the divergency of neutron flux 2287900100060 HISTORY (20051108C) 2287900100061 (20060627A) SM - Author name corrected to O'Brien 2287900100062 (20070409U) EN-MEAN changed to KT - SM 2287900100063 (20211007A) SD: Major corrections in all Subents. 2287900100064 Subent 003 was split in two. Subents 004-006 added. 2287900100065 ENDBIB 63 0 2287900100066 COMMON 5 3 2287900100067 ERR-1 ERR-S ERR-3 ERR-4 ERR-5 2287900100068 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2287900100069 0.2 0.4 1.4 1.3 0.7 2287900100070 ENDCOMMON 3 0 2287900100071 ENDSUBENT 70 0 2287900199999 SUBENT 22879002 20211007 23042287900200001 BIB 9 33 2287900200002 REACTION (57-LA-139(N,G)57-LA-140,,SIG,,SPA) 2287900200003 RAD-DET (57-LA-140,DG) 2287900200004 DECAY-DATA (57-LA-140,1.6781D,DG,328.76,0.203, 2287900200005 DG,487.02,0.455, 2287900200006 DG,815.77,0.233, 2287900200007 DG,1596.2,0.954) 2287900200008 DECAY-MON (79-AU-198-G,2.6952D,DG,411.8,0.956) 2287900200009 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 2287900200010 ERR-ANALYS ERR-SYS < 0.7 mb 2287900200011 (ERR-6,,0.03) Error in self-absorption for lanthanum 2287900200012 The uncertainty in the monitor reaction- 2287900200013 (ERR-7) Error in sample thickness for gold is 0.1% 2287900200014 (ERR-8,,0.05) Error in self-absorption is for gold 2287900200015 (ERR-9) Error in the gamma-ray intensity per decay 2287900200016 for gold 2287900200017 (ERR-HL) Au-198 half-life error 2287900200018 (ERR-IDD) Au-198 intensity error 2287900200019 (MONIT-ERR) Error in monitor 2287900200020 COMMENT *By authors* The final La-139(n,gamma)La-140 cross 2287900200021 section was adopted from the result of the third 2287900200022 activation with the smallest systematic 2287900200023 uncertainty = 33.2+-0.7 mb. 2287900200024 Throughout the analysis, the four strongest lines of 2287900200025 the decay of La-140 were studied. Through their 2287900200026 intensities were found to be perfectly consistent with 2287900200027 each other, only the line at 487-keV was considered for2287900200028 the final analysis. 2287900200029 STATUS (TABLE) Text on p.035801-3 from 2287900200030 Phys.Rev.,C68(2003)035801. Data from LA3 measurement, 2287900200031 E=487.02 gamma line, with minimal systematic error 2287900200032 (SPSDD,22879005) Renormalized. 2287900200033 HISTORY (20211007A) SD: SF8=MXW -> SPA in REACTION code. 2287900200034 kT = 30. -> 25.keV. BIB updated. Subent superseded. 2287900200035 ENDBIB 33 0 2287900200036 COMMON 4 3 2287900200037 ERR-7 ERR-9 ERR-HL ERR-IDD 2287900200038 PER-CENT PER-CENT D NO-DIM 2287900200039 0.1 0.5 0.0002 0.001 2287900200040 ENDCOMMON 3 0 2287900200041 DATA 5 1 2287900200042 KT-DUMMY DATA ERR-T MONIT MONIT-ERR 2287900200043 KEV MB PER-CENT MB MB 2287900200044 25. 33.2 2.2 586. 8. 2287900200045 ENDDATA 3 0 2287900200046 ENDSUBENT 45 0 2287900299999 SUBENT 22879003 20211007 23042287900300001 BIB 4 10 2287900300002 REACTION (57-LA-139(N,G)57-LA-140,,SIG,,MXW) 2287900300003 ANALYSIS Energy dependent JEFF cross sections normalized to 2287900300004 reproduce the measured spectrum averaged cross section2287900300005 and folded by the Maxwellian spectrum. 2287900300006 STATUS (TABLE) Table VI from Phys.Rev.,C68(2003)035801 2287900300007 (DEP,22879002) 2287900300008 (SPSDD,22879006) Renormalized. 2287900300009 HISTORY (20211007A) SD: Subent was split in two. Part of data 2287900300010 moved to Subent 004. COMMENT deleted. Analysis added. 2287900300011 Subent superseded. 2287900300012 ENDBIB 10 0 2287900300013 NOCOMMON 0 0 2287900300014 DATA 3 1 2287900300015 KT DATA ERR-T 2287900300016 KEV MB MB 2287900300017 25. 35.7 0.8 2287900300018 ENDDATA 3 0 2287900300019 ENDSUBENT 18 0 2287900399999 SUBENT 22879004 20211007 23042287900400001 BIB 6 19 2287900400002 REACTION (57-LA-139(N,G)57-LA-140,,SIG,,MXW,DERIV) 2287900400003 ANALYSIS Energy dependent JEFF cross sections normalized to 2287900400004 reproduce the measured spectrum averaged cross section2287900400005 and folded by the Maxwellian spectrum. 2287900400006 ERR-ANALYS In order to calculate the respective uncertainties, 2287900400007 one would need the error in the differential cross 2287900400008 section, which is not provide in the evaluation. See 2287900400009 REL-REF. There any additional errors are omitted except2287900400010 for the 25 keV value and for the value at 30 keV, 2287900400011 which is commonly used for comparison of astrophysical 2287900400012 (n,gamma) rates. For the extrapolation from 25 to 2287900400013 30 keV an additional systematic uncertainty of 1.2% was2287900400014 considered. 2287900400015 REL-REF (R,,C.Nordborg+,C,94GATLIN,,680,1994) 2287900400016 (A,30390018,R.P.Anand+,J,NC/A,50,247,1979) 2287900400017 STATUS (TABLE) Table VI from Phys.Rev.,C68(2003)035801 2287900400018 (DEP,22879003) 2287900400019 (SPSDD,22879007) Renormalized. 2287900400020 HISTORY (20211007T) SD: Part of Subent 003. Subent superseded. 2287900400021 ENDBIB 19 0 2287900400022 NOCOMMON 0 0 2287900400023 DATA 3 12 2287900400024 KT DATA ERR-T 2287900400025 KEV MB MB 2287900400026 5. 104. 2287900400027 8. 76.3 2287900400028 10. 65.8 2287900400029 15. 50. 2287900400030 20. 41.3 2287900400031 23. 37.7 2287900400032 30. 31.6 0.8 2287900400033 40. 26. 2287900400034 50. 22.4 2287900400035 60. 19.8 2287900400036 80. 16.3 2287900400037 100. 14.1 2287900400038 ENDDATA 14 0 2287900400039 ENDSUBENT 38 0 2287900499999 SUBENT 22879005 20211007 23042287900500001 BIB 10 16 2287900500002 REACTION 1((57-LA-139(N,G)57-LA-140,,SIG,,SPA)/ 2287900500003 (79-AU-197(N,G)79-AU-198,,SIG,,SPA)) 2287900500004 2(57-LA-139(N,G)57-LA-140,,SIG,,SPA) 2287900500005 RAD-DET (57-LA-140,DG) 2287900500006 DECAY-DATA (57-LA-140,1.6781D,DG,328.76,0.203, 2287900500007 DG,487.02,0.455, 2287900500008 DG,815.77,0.233, 2287900500009 DG,1596.2,0.954) 2287900500010 DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 2287900500011 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2287900500012 ANALYSIS Cross section value in Subent 22879.002 is 2287900500013 renormalized for new gold cross section 2287900500014 ERR-ANALYS (MONIT-ERR) Error in monitor 2287900500015 CORRECTION Correction for revised gold standard: 622.7/586=1.062 2287900500016 STATUS (TABLE) p.169 of INDC(GER)-0053 2287900500017 HISTORY (20211007C) SD 2287900500018 ENDBIB 16 0 2287900500019 NOCOMMON 0 0 2287900500020 DATA 7 1 2287900500021 KT-DUMMY DATA 1ERR-T 1DATA 2ERR-T 2MONIT 2287900500022 MONIT-ERR 2287900500023 KEV NO-DIM NO-DIM MB PER-CENT MB 2287900500024 MB 2287900500025 25. 0.0567 0.0010 35.3 0.7 622.72287900500026 6.2 2287900500027 ENDDATA 6 0 2287900500028 ENDSUBENT 27 0 2287900599999 SUBENT 22879006 20211007 23042287900600001 BIB 5 6 2287900600002 REACTION (57-LA-139(N,G)57-LA-140,,SIG,,MXW) 2287900600003 ANALYSIS Cross section value in Subent 22879.003 is 2287900600004 renormalized for new gold cross section 2287900600005 CORRECTION Correction for revised gold standard: 622.7/586=1.062 2287900600006 STATUS (TABLE) p.170 of INDC(GER)-0053 2287900600007 HISTORY (20211007C) SD 2287900600008 ENDBIB 6 0 2287900600009 NOCOMMON 0 0 2287900600010 DATA 3 1 2287900600011 KT DATA ERR-T 2287900600012 KEV MB MB 2287900600013 25. 37.9 0.8 2287900600014 ENDDATA 3 0 2287900600015 ENDSUBENT 14 0 2287900699999 SUBENT 22879007 20211007 23042287900700001 BIB 5 6 2287900700002 REACTION (57-LA-139(N,G)57-LA-140,,SIG,,MXW,DERIV) 2287900700003 ANALYSIS Cross section values in Subent 22879.004 are 2287900700004 renormalized for new gold cross section 2287900700005 CORRECTION Correction for revised gold standard: 622.7/586=1.062 2287900700006 STATUS (TABLE) p.170 of INDC(GER)-0053 2287900700007 HISTORY (20211007C) SD 2287900700008 ENDBIB 6 0 2287900700009 NOCOMMON 0 0 2287900700010 DATA 3 12 2287900700011 KT DATA ERR-T 2287900700012 KEV MB MB 2287900700013 5. 110. 2287900700014 8. 81.0 2287900700015 10. 69.9 2287900700016 15. 53.1 2287900700017 20. 43.9 2287900700018 23. 40.0 2287900700019 30. 33.6 0.8 2287900700020 40. 27.6 2287900700021 50. 23.8 2287900700022 60. 21.0 2287900700023 80. 17.3 2287900700024 100. 15.0 2287900700025 ENDDATA 14 0 2287900700026 ENDSUBENT 25 0 2287900799999 ENDENTRY 7 0 2287999999999