ENTRY 23252 20211122 23052325200000001
SUBENT 23252001 20211122 23052325200100001
BIB 12 35 2325200100002
TITLE A measurement of the 14C(n,gamma)15C cross section 2325200100003
at a stellar temperature of kT=23.3 keV 2325200100004
AUTHOR (H.Beer, M.Wiescher, F.Kaeppeler, J.Goerres, 2325200100005
P.E.Koehler) 2325200100006
INSTITUTE (2GERKFK) 2325200100007
REFERENCE (J,AJ,387,258,1992) 2325200100008
(R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2325200100009
cross sections. 2325200100010
FACILITY (VDG,2GERKFK) 3.75 MV Van de Graaff 2325200100011
INC-SOURCE (P-LI7) 2325200100012
SAMPLE (6-C-14,ENR=0.89) Powder sample (605 +/- 15 mg, 2325200100013
2.97 cm x 1.20 cm x 0.5 cm) packed in a 0.0508 mm 2325200100014
thick electroformed Ni container with a porous CH2 2325200100015
plug glued into the open end. 2325200100016
Effective irradiated sample area was 2.97 cm x 1.20 cm 2325200100017
= 3.56 cm2. 2325200100018
MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2325200100019
DETECTOR (HPGE) Relative efficiency 35%, energy resolution of 2325200100020
1.72 keV at 1.33 MeV. 2325200100021
27Al(p,g) resonance at 992 keV was used to determine 2325200100022
the gamma-ray efficiency from 1.84 to 11 MeV. 2325200100023
Pu238-C13 source with a line at 6.13 MeV was also used 2325200100024
for the efficiency determination. 2325200100025
METHOD (ACTIV) A fast sample changer was used. 2325200100026
Both irradiation time and counting time are 10 sec. 2325200100027
ERR-ANALYS (ERR-T) Quadratic error propagation from 2325200100028
(ERR-S) 14C(n,gamma)15C statistics (23%) 2325200100029
(ERR-1) Ge-detector efficiency for 15C (8%) 2325200100030
(ERR-3) 14C sample weight (2.5%) 2325200100031
(ERR-4) 15C gamma line intensity (2.9%) 2325200100032
(ERR-7,,1.) Neutron multiple scattering (<1%) 2325200100033
(MONIT-ERR) 197Au(n,gamma) standard cross section 2325200100034
HISTORY (20140812C) On 2325200100035
(20211122A) SD: Corrections in all Subents. 2325200100036
Subent 003 added. 2325200100037
ENDBIB 35 0 2325200100038
COMMON 3 3 2325200100039
ERR-1 ERR-3 ERR-4 2325200100040
PER-CENT PER-CENT PER-CENT 2325200100041
8. 2.5 2.9 2325200100042
ENDCOMMON 3 0 2325200100043
ENDSUBENT 42 0 2325200199999
SUBENT 23252002 20211122 23052325200200001
BIB 7 10 2325200200002
REACTION (6-C-14(N,G)6-C-15,,SIG,,MXW) 2325200200003
DECAY-DATA (6-C-15,2.449SEC,DG,5297.79,0.68) 2325200200004
MONIT-REF (22099001,W.Ratynski+,J,PR/C,37,595,1988) 2325200200005
DECAY-MON (79-AU-198-G,2.694D,DG,411.8,0.9552) 2325200200006
ERR-ANALYS (ERR-2) Ge-detector efficiency for 198Au (1.5%) 2325200200007
(ERR-5) 198Au gamma line intensity (0.105%) 2325200200008
(ERR-6) Misalignment of Au foils relative to 14C (2%) 2325200200009
STATUS (TABLE) Table 3 of Astrophys.J.387(1992)258 2325200200010
(SPSDD,23252003) Renormalized. 2325200200011
HISTORY (20211122A) SD: BIB updated. Subent superseded. 2325200200012
ENDBIB 10 0 2325200200013
COMMON 3 3 2325200200014
ERR-2 ERR-5 ERR-6 2325200200015
PER-CENT PER-CENT PER-CENT 2325200200016
1.5 0.105 2. 2325200200017
ENDCOMMON 3 0 2325200200018
DATA 6 1 2325200200019
KT DATA ERR-T ERR-S MONIT MONIT-ERR 2325200200020
KEV MICRO-B PER-CENT PER-CENT MB PER-CENT 2325200200021
23.3 1.72 25. 23. 648. 1.5 2325200200022
ENDDATA 3 0 2325200200023
ENDSUBENT 22 0 2325200299999
SUBENT 23252003 20211122 23052325200300001
BIB 8 15 2325200300002
REACTION 1((6-C-14(N,G)6-C-15,,SIG,,MXW)/ 2325200300003
(79-AU-197(N,G)79-AU-198,,SIG,,MXW)) 2325200300004
2(6-C-14(N,G)6-C-15,,SIG,,MXW) 2325200300005
DECAY-DATA (6-C-15,2.449SEC,DG,5297.79,0.632) 2325200300006
DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 2325200300007
MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2325200300008
ANALYSIS Cross section value in Subent 23252.002 is 2325200300009
renormalized 2325200300010
a)for new gold cross section 2325200300011
b) by an additional factor 0.68/0.632=1.076, which 2325200300012
accounts for the gamma-intensity of the 5297.29 keV 2325200300013
transition in the 15C decay (NDS/ENSDF 2020) 2325200300014
CORRECTION Correction for revised gold standard: 681/648 =1.051 2325200300015
STATUS (TABLE) Table on p.352 of INDC(GER)-0053 2325200300016
HISTORY (20211122C) SD 2325200300017
ENDBIB 15 0 2325200300018
NOCOMMON 0 0 2325200300019
DATA 8 1 2325200300020
KT DATA 1ERR-T 1DATA 2ERR-T 2ERR-S 2325200300021
MONIT MONIT-ERR 2325200300022
KEV NO-DIM NO-DIM MICRO-B PER-CENT PER-CENT 2325200300023
MB PER-CENT 2325200300024
23.3 2.65E-06 0.66E-06 1.97 25. 23. 2325200300025
681. 1.0 2325200300026
ENDDATA 6 0 2325200300027
ENDSUBENT 26 0 2325200399999
ENDENTRY 3 0 2325299999999