ENTRY 22078 20210803 23032207800000001 SUBENT 22078001 20210803 23032207800100001 BIB 13 44 2207800100002 TITLE The cross section of N-14(n,p)C-14 at stellar energies2207800100003 and its role as a neutron poison for S-process 2207800100004 nucleosynthesis 2207800100005 AUTHOR (K.Brehm,H.W.Becker,C.Rolfs,H.P.Trautvetter,F.Kappeler,2207800100006 W.Ratynski) 2207800100007 REFERENCE (J,ZP/A,330,167,1988) 2207800100008 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2207800100009 cross sections. 2207800100010 INSTITUTE (2GERKFK) F.K.,W.R. Experimental site 2207800100011 (2GERMST) K.B.,H.B.,C.R.,H.T. 2207800100012 FACILITY (VDG,2GERKFK) 3.75 MV van de Graaff accelerator 2207800100013 INC-SOURCE (P-LI7) For the experiment kT=25.0 keV or kT=25.3 keV2207800100014 (P-T) for the experiment kT=52.4 2207800100015 INC-SPECT The neutron flux was about 10**8 n/cm2/s. 2207800100016 METHOD (ACTIV) For the monitor 2207800100017 DETECTOR (SI) Two Si detectors (thickness t= 20 um, active 2207800100018 area 100.3 +-0.8 mm2) 2207800100019 MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2207800100020 SAMPLE Three different targets and geometries were used 2207800100021 -1) close geometry setup with a target of 2207800100022 210+-21 ug/cm2 of melamine (C3N6H6) produced by 2207800100023 evaporation onto Al disks. 2207800100024 -2) A target chamber was used. The target material was2207800100025 evaporated on 0.1mm thick Al disks with a 2207800100026 thickness of 125+-13 ug/cm2. The target was at 2207800100027 2mm from the the Li7 target and exposed to the 2207800100028 full neutron cone. 2207800100029 -3) A Si detector was the central layer of a chamber, 2207800100030 which the downstream part was filled with argon Ga2207800100031 and the upstream part with air (78.02% N2, 2207800100032 20.95% O2,0.93% Ar), both parts at 2207800100033 atmospheric pressure. The nitrogen air target is a2207800100034 cylinder defined by the active area of the 2207800100035 detector and an Al plug. 2207800100036 ERR-ANALYS (DATA-ERR) The quoted errors were obtained by 2207800100037 quadratic addition of the uncertainties: 2207800100038 * in number of counts (statistical), 2207800100039 * background subtraction, 2207800100040 * contribution of the low-energy tail, and 2207800100041 * dead time effects. 2207800100042 HISTORY (19880809C) IF. 2207800100043 (20210803A) SD:Updated to new date formats,lower case. 2207800100044 Corrections in all Subents. Subent 003 added. 2207800100045 ERR-T -> DATA-ERR. 2207800100046 ENDBIB 44 0 2207800100047 NOCOMMON 0 0 2207800100048 ENDSUBENT 47 0 2207800199999 SUBENT 22078002 20210803 23032207800200001 BIB 4 9 2207800200002 REACTION (7-N-14(N,P)6-C-14,,SIG,,MXW) 2207800200003 FLAG (1.)Neutron source Li-7(p,n) first geometry 2207800200004 (2.)neutron source Li-7(p,n) second geometry 2207800200005 (3.)neutron source Li-7(p,n) third geometry 2207800200006 (4.)neutron source T(p,n) third geometry 2207800200007 STATUS (TABLE) Tbl.1 from Zeitschrift.Phys.,A330(1988)167 2207800200008 (SPSDD,22078003) Renormalized. 2207800200009 HISTORY (19880809C) IF. 2207800200010 (20210803A) SD: Superseded. STATUS added. 2207800200011 ENDBIB 9 0 2207800200012 NOCOMMON 0 0 2207800200013 DATA 6 10 2207800200014 KT DATA DATA-ERR MONIT MONIT-ERR FLAG 2207800200015 KEV MB MB MB MB NO-DIM 2207800200016 25.0 0.87 0.13 648.0 10.0 1.2207800200017 25.0 0.78 0.08 648.0 10.0 2.2207800200018 25.0 1.10 0.09 648.0 10.0 2.2207800200019 25.0 0.85 0.29 648.0 10.0 2.2207800200020 25.3 0.80 0.12 3.2207800200021 25.3 0.86 0.08 3.2207800200022 25.3 0.73 0.04 3.2207800200023 25.3 0.84 0.06 3.2207800200024 52.4 0.55 0.08 426.0 6.0 4.2207800200025 52.4 0.50 0.08 426.0 6.0 4.2207800200026 ENDDATA 12 0 2207800200027 ENDSUBENT 26 0 2207800299999 SUBENT 22078003 20210803 23032207800300001 BIB 7 19 2207800300002 REACTION (7-N-14(N,P)6-C-14,,SIG,,MXW) 2207800300003 FLAG (1.)Neutron source Li-7(p,n) first geometry 2207800300004 (2.)neutron source Li-7(p,n) second geometry 2207800300005 (3.)neutron source Li-7(p,n) third geometry 2207800300006 (4.)neutron source T(p,n) third geometry 2207800300007 ANALYSIS Cross section value in Subentry 22078.002 is 2207800300008 renormalized 2207800300009 a) for new gold cross section 2207800300010 Revised data: 2207800300011 Measured quantity at KT=25 keV: 2207800300012 cross section ratio 14N/197Au = 0.00132+-0.00012 2207800300013 b) note that the quoted neutron energies refer to 2207800300014 the lab system; effective energies in the c.m. system 2207800300015 have to be reduced by 14/15 2207800300016 CORRECTION Correction for revised gold standard 681/648 =1.051 2207800300017 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2207800300018 STATUS (TABLE) p.46 of INDC(GER)-0053 2207800300019 (DEP,22078004) Reaction ratio 2207800300020 HISTORY (20210701C) SD 2207800300021 ENDBIB 19 0 2207800300022 NOCOMMON 0 0 2207800300023 DATA 6 10 2207800300024 KT DATA DATA-ERR MONIT MONIT-ERR FLAG 2207800300025 KEV MB MB MB MB NO-DIM 2207800300026 25. 0.91 0.14 681. 7. 1.2207800300027 25. 0.82 0.08 681. 7. 2.2207800300028 25. 1.16 0.09 681. 7. 2.2207800300029 25. 0.89 0.30 681. 7. 2.2207800300030 25.3 0.84 0.13 677. 7. 3.2207800300031 25.3 0.90 0.08 677. 7. 3.2207800300032 25.3 0.76 0.04 677. 7. 3.2207800300033 25.3 0.88 0.06 677. 7. 3.2207800300034 52.4 0.58 0.08 448. 5. 4.2207800300035 52.4 0.53 0.08 448. 5. 4.2207800300036 ENDDATA 12 0 2207800300037 ENDSUBENT 36 0 2207800399999 SUBENT 22078004 20210803 23032207800400001 BIB 3 4 2207800400002 REACTION ((7-N-14(N,P)6-C-14,,SIG,,MXW)/ 2207800400003 (79-AU-197(N,G)79-AU-198,,SIG,,MXW)) 2207800400004 STATUS (TABLE) p.46 of INDC(GER)-0053 2207800400005 HISTORY (20210701C) SD 2207800400006 ENDBIB 4 0 2207800400007 NOCOMMON 0 0 2207800400008 DATA 3 1 2207800400009 KT DATA DATA-ERR 2207800400010 KEV NO-DIM NO-DIM 2207800400011 25. 0.00132 0.00012 2207800400012 ENDDATA 3 0 2207800400013 ENDSUBENT 12 0 2207800499999 ENDENTRY 4 0 2207899999999