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