ENTRY 22995 20211103 23052299500000001 SUBENT 22995001 20211103 23052299500100001 BIB 16 81 2299500100002 TITLE The 14-C(n,gamma) cross section between 10 keV 2299500100003 and 1 MeV 2299500100004 AUTHOR (R.Reifarth, M.Heil, C.Forssen, U.Besserer, A.Couture, 2299500100005 S.Dababneh, L.Doerr, J.Goerres, R.C.Haight,F.Kaeppeler,2299500100006 A.Mengoni, S.O'Brien, N.Patronis, R.Plag, R.S.Rundberg,2299500100007 M.Wiescher, J.B.Wilhelmy) 2299500100008 REFERENCE (J,PR/C,77,015804,2008) Main reference. New analysis, 2299500100009 Final results. 2299500100010 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2299500100011 cross sections. 2299500100012 (C,2006CERN,,(223),200606) Re-analysis of prelim.data. 2299500100013 Paper number 223. 2299500100014 (J,NP/A,758,787,2005) Preliminary results 2299500100015 REL-REF (I,,A.Antilla+,J,NIM,147,501,1977) Experimental details2299500100016 and C-15 decay-data 2299500100017 (I,,H.Beer+,J,NIM/A,337,492,1994) Experimental details 2299500100018 (A,,H.Beer+,J,AJ,387,258,1992) Previous activation 2299500100019 result for Maxwell-averaged cross section with 2299500100020 kT=23.3 keV. Agrees, if new sample mass is taken into 2299500100021 account and a similar dead-time problem like during 2299500100022 this experiment is assumed. 2299500100023 INSTITUTE (2GERKFK) Forschungszentrum Karlsruhe, Institut fuer 2299500100024 Kernphysik, Germany. F.Kaeppeler, R.Plag, 2299500100025 S.Dababneh, M.Heil; 2299500100026 Forschungszentrum Karlsruhe, Tritiumlabor. L.Doerr, 2299500100027 U.Besserer. 2299500100028 (1USALAN) Los Alamos National Laboratory, Los Alamos, 2299500100029 New Mexico, USA. R.Reifarth, A.Couture, R.C.Height, 2299500100030 R.S.Rundberg, J.B.Wilhelmy. 2299500100031 (1USALRL) Lawrence Livermore National Laboratory, 2299500100032 Livermore, California, USA. C.Forssen, N.Patronis. 2299500100033 (2SWDCTH) Fundamental Physics, Chalmers University 2299500100034 of Technology, Goeteborg, Sweden. C.Forssen. 2299500100035 (1USANOT) University of Notre Dame, Physics Depart., 2299500100036 Notre Dame, Indiana, USA. S.O'Brien, J.Goerres, 2299500100037 M.Wiescher. 2299500100038 (2ZZZCER) CERN, CH-1211 Geneva 23, Switzerland. 2299500100039 A.Mengoni. 2299500100040 (2GRCIOA) Nuclear Physics Laboratory, Department of 2299500100041 Physics, The University of Ioannina, Ioannina, 2299500100042 Greece. N.Patronis. 2299500100043 FACILITY (VDG,2GERKFK) 3.7 MV Van de Graaff accelerator 2299500100044 ANALYSIS The main difference of this article data from that 2299500100045 of the preliminary in REFERENCE NP/A,758 is discovery 2299500100046 of the huge dead time effect during the experiment. 2299500100047 METHOD (ACTIV) Cyclic activation technique 2299500100048 (GSPEC) 2299500100049 INC-SOURCE (P-LI7) A metallic Li-7 target of different Li-7 layer 2299500100050 thicknesses with protons of different energies above 2299500100051 the (P,N) reaction threshold. 2299500100052 INC-SPECT Spectrum at the place of the sample is determined 2299500100053 by averaging of the down- and upstream gold monitor 2299500100054 samples. 2299500100055 Neutron fluxes between 1.E+7 - 1.E+9 1/cm**2/s . 2299500100056 DETECTOR (HPGE) A High-purity germanium detector with a relative2299500100057 efficiency of 100%. The detector efficiency was 2299500100058 determined with a set of calibration sources and via 2299500100059 the 13-Al-27(P,G)14-Si-28 reaction. 2299500100060 CORRECTION Correction for dead time of about factor of three (!) 2299500100061 MONITOR (79-AU-197(N,G)79-AU-198-G,,SIG,,MXW) 2299500100062 (13-AL-27(P,G)14-SI-28,,SIG) For detector calibration 2299500100063 SAMPLE C-14 mass was determined with the help of its BETA- 2299500100064 activity and is 283 +- 3 mg. The sample was 2299500100065 sandwiched between two thin gold foils. 2299500100066 ERR-ANALYS (ERR-T) Total error equal to quadratic sum of its 2299500100067 constituents 2299500100068 (ERR-S,2.,8.) Error of counting statistics 2.-8.%. 2299500100069 (ERR-1) Error due to the gamma detector efficiency 2299500100070 (ERR-2,2.,10.) error of the negutron flux determination2299500100071 * all other uncertainties are smaller than 2%. 2299500100072 HISTORY (20080214C) SM 2299500100073 (20081222A) M.M. Reference 2007CERN,223 was added. 2299500100074 Reference (J,AJ,387,258,1992) was moved in REL-REF 2299500100075 lines (previous activation result). 2299500100076 ERR-ANALYS was corrected, ERR-S, ERR-2, ERR-3 were 2299500100077 deleted from COMMON as min/max errors. 2299500100078 (20101105A) SD: ERR-ANALYS corrected: min/max errors 2299500100079 are shown in description. 2299500100080 (20170825U) SD: Syntax of 2006CERN ref. corrected. 2299500100081 (20211103A) SD: Corrections in all Subents. 2299500100082 Subent 004 added. 2299500100083 ENDBIB 81 0 2299500100084 COMMON 1 3 2299500100085 ERR-1 2299500100086 PER-CENT 2299500100087 5. 2299500100088 ENDCOMMON 3 0 2299500100089 ENDSUBENT 88 0 2299500199999 SUBENT 22995002 20211103 23052299500200001 BIB 9 13 2299500200002 REACTION (6-C-14(N,G)6-C-15,,SIG,,MXW) 2299500200003 INC-SOURCE Li-7 target thickness is 30 u-m, proton energy is 2299500200004 1912 keV, 30 keV above Li-7(p,n) reaction threshold 2299500200005 INC-SPECT Spectrum can be approximated by Maxwellian with 2299500200006 temperature kT = 23.3 keV 2299500200007 DECAY-MON (79-AU-198-G,2.694D,DG,411.8,0.9552) 2299500200008 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 2299500200009 ERR-ANALYS (MONIT-ERR) Uncertainty in monitor reaction 2299500200010 COMMENT Note that in this case the neutron energy is 2299500200011 given in the center-of-mass system 2299500200012 STATUS (TABLE) Table V of Phys.Rev.,C77(2008)015804 2299500200013 (SPSDD,22995004) Renormalized. 2299500200014 HISTORY (20211103A) SD: MONIT/ERR added. Subent superseded. 2299500200015 ENDBIB 13 0 2299500200016 COMMON 3 3 2299500200017 KT-NRM MONIT MONIT-ERR 2299500200018 KEV MB MB 2299500200019 25. 586. 8. 2299500200020 ENDCOMMON 3 0 2299500200021 DATA 4 1 2299500200022 KT DATA ERR-T ERR-T 2299500200023 KEV MICRO-B MICRO-B PER-CENT 2299500200024 23.3 7.1 0.5 6.7 2299500200025 ENDDATA 3 0 2299500200026 ENDSUBENT 25 0 2299500299999 SUBENT 22995003 20211103 23052299500300001 BIB 9 15 2299500300002 REACTION (6-C-14(N,G)6-C-15,,SIG,,SPA) 2299500300003 INC-SOURCE Li-7 target thickness is 5 mu-m, proton energies are 2299500300004 2001 - 2530 keV, above Li-7(p,n) reaction threshold 2299500300005 INC-SPECT Unsymmetric broad neutron spectrum with resolution 2299500300006 taken by compiler from Fig.3 of main reference. 2299500300007 Spectra are typical for mono-energetic experiment with2299500300008 wide energy uncertainty (for 150 and 500 keV). 2299500300009 DECAY-MON (79-AU-198-G,2.694D,DG,411.8,0.9552) 2299500300010 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 2299500300011 MISC-COL (MISC) Proton energy 2299500300012 ERR-ANALYS (ERR-SYS) Systematic error 2299500300013 STATUS (TABLE) Table V of Phys.Rev.,C77(2008)015804 2299500300014 (CURVE) Spectrum width EN-RSL-FW taken from the 2299500300015 curves Fig.3, #2-#3-#4 from above 2299500300016 HISTORY (20211103U) SD: MONIT-REF added from Subent 001. 2299500300017 ENDBIB 15 0 2299500300018 NOCOMMON 0 0 2299500300019 DATA 7 3 2299500300020 EN-MEAN EN-RSL-FW DATA ERR-T ERR-T ERR-SYS 2299500300021 MISC 2299500300022 KEV KEV MICRO-B MICRO-B PER-CENT PER-CENT 2299500300023 KEV 2299500300024 150. 9. E+01 10.7 1.2 11. 2299500300025 2001. 2299500300026 500. 1.3 E+02 17.0 1.5 8.8 2299500300027 2291. 2299500300028 750. 1.5 E+02 15.8 1.6 10. 5. 2299500300029 2530. 2299500300030 ENDDATA 10 0 2299500300031 ENDSUBENT 30 0 2299500399999 SUBENT 22995004 20211103 23052299500400001 BIB 10 16 2299500400002 REACTION 1((6-C-14(N,G)6-C-15,,SIG,,MXW)/ 2299500400003 (79-AU-197(N,G)79-AU-198,,SIG,,SPA)) 2299500400004 2(6-C-14(N,G)6-C-15,,SIG,,MXW) 2299500400005 INC-SOURCE Li-7 target thickness is 30 mu-m, proton energy is 2299500400006 1912 keV, 30 keV above Li-7(p,n) reaction threshold 2299500400007 INC-SPECT Spectrum can be approximated by Maxwellian with 2299500400008 temperature kT = 23.3 keV 2299500400009 DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 2299500400010 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2299500400011 ANALYSIS Cross section value in Subent 22995.002 is 2299500400012 renormalized for new gold cross section 2299500400013 CORRECTION Correction for revised gold standard: 622.7/586 =1.0622299500400014 COMMENT Note that in this case the neutron energy is 2299500400015 given in the center-of-mass system 2299500400016 STATUS (TABLE) Table from p.256 of INDC(GER)-0053 2299500400017 HISTORY (20211103C) SD 2299500400018 ENDBIB 16 0 2299500400019 NOCOMMON 0 0 2299500400020 DATA 6 1 2299500400021 KT DATA 1ERR-T 1DATA 2ERR-T 2ERR-T 22299500400022 KEV NO-DIM NO-DIM MICRO-B MICRO-B PER-CENT 2299500400023 23.3 0.122E-04 0.008E-04 7.5 0.5 6.6 2299500400024 ENDDATA 3 0 2299500400025 ENDSUBENT 24 0 2299500499999 ENDENTRY 4 0 2299599999999