ENTRY 22099 20201207 22952209900000001 SUBENT 22099001 20201207 22952209900100001 BIB 15 42 2209900100002 TITLE Neutron capture cross section of 197Au: A standard for 2209900100003 stellar nucleosynthesis 2209900100004 AUTHOR (W.Ratynski, F.Kaeppeler) 2209900100005 INSTITUTE (2GERKFK) 2209900100006 REFERENCE (J,PR/C,37,595,1988) 2209900100007 REL-REF (O,O1963001,W.Ratynski+,J,PR/C,37,595,1988) 2209900100008 7Li(p,n)7Be neutron spectrum compiled separately 2209900100009 FACILITY (VDG,2GERKFK) 2209900100010 INC-SOURCE (P-LI7) Metallic Li layers (100 keV thick, 3, 4 or 2209900100011 6 mm diam.) on Cu backing (1.0, 0.7 or 0.5 mm thick) 2209900100012 or Ag/Pt backing (0.2 mm thick) irradiated by protons 2209900100013 at 1912 keV and less than 1 uA/mm2. 2209900100014 SAMPLE Spherical segment of Au (0.02 and 0.05 mm thick) 2209900100015 METHOD (ACTIV) Irradiated for 1 to 4 hrs and typically 2209900100016 counted for 16-24 hrs (Au) and 1-2 hrs (Be) 2209900100017 DETECTOR (SCIN) 6Li glass detector to monitor neutrons 2209900100018 (HPGE) Coaxial HPGe detector (energy resolution of 2209900100019 1.7 keV at 1.33 MeV) 2209900100020 MONITOR (3-LI-7(P,N)4-BE-7,,SIG) 2209900100021 DECAY-MON (4-BE-7,,DG,478.,0.1045) 2209900100022 CORRECTION Corrected for 2209900100023 - solid angle for extended sources 2209900100024 - gamma-ray self-absorption 2209900100025 - neutron scattering in target 2209900100026 ERR-ANALYS (ERR-1) sample thickness - Au (0.6%)2209900100027 (ERR-2) counting statistics - Au (0.4%)2209900100028 (ERR-3) counting statistics - Be (0.3%)2209900100029 (ERR-4) gamma-ray efficiency ratio - Be/Au (0.3%)2209900100030 (ERR-5) solid angle for extended sources (0.6%)2209900100031 (ERR-6) gamma-ray intensity per decay - Au (0.1%)2209900100032 (ERR-7) gamma-ray intensity per decay - Be (0.4%)2209900100033 (ERR-8) gamma-ray self-absorption - Au (0.3%)2209900100034 (ERR-9) gamma-ray self-absorption - Be (0.5%)2209900100035 (ERR-10,0.1,0.4) neutron scattering in target(0.1-0.4%)2209900100036 (ERR-11) decay constant - Au (0.1%)2209900100037 (ERR-12,,0.1) decay constant - Be (<0.1%)2209900100038 HISTORY (19881126C) N.O. 2209900100039 (19910716A) S.W. Facility lab added, CRITIQUE added 2209900100040 (20140822A) SD: Updated to new date formats,lower case.2209900100041 Corrections according last EXFOR rules and Dict. 2209900100042 Value in Subent 2 corrected. ERR-ANALYS updated. 2209900100043 (20201207A) On. Major revisions in 002. 003-004 added. 2209900100044 ENDBIB 42 0 2209900100045 COMMON 10 6 2209900100046 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2209900100047 ERR-7 ERR-8 ERR-9 ERR-11 2209900100048 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2209900100049 PER-CENT PER-CENT PER-CENT PER-CENT 2209900100050 0.6 0.4 0.3 0.3 0.6 0.1 2209900100051 0.4 0.3 0.5 0.1 2209900100052 ENDCOMMON 6 0 2209900100053 ENDSUBENT 52 0 2209900199999 SUBENT 22099002 20201207 22952209900200001 BIB 7 15 2209900200002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,SPA) 2209900200003 DECAY-DATA (79-AU-198,,DG,412.,0.955) 2209900200004 ANALYSIS Average of eight cross sections: 2209900200005 589(9) mb, 598(8) mb, 574(8) mb, 590(8) mb, 2209900200006 587(9) mb, 582(8) mb, 576(8) mb, 595(9) mb 2209900200007 REL-REF (C,,R.Reifarth+,J,EPJ/P,133,424,2018) 2209900200008 The reported value (586+/-8 mb) is revised to 2209900200009 622.7 +/- 6.2 mb for spherical 197Au samples, 2209900200010 651.6 +/- 6.5 mb for flat 197Au samples. 2209900200011 ERR-ANALYS (ERR-T) Total uncertainty 2209900200012 irradiation history, time factors - negligible 2209900200013 STATUS (TABLE) Text (p.603) of Phys.Rev.C37(1988)595 2209900200014 HISTORY (20140822A) SD: Value from DATA section corrected: 2209900200015 586+/-8 mb -> 648+/-10 mb 2209900200016 (20201207A) On. Effective cross section restored. 2209900200017 ENDBIB 15 0 2209900200018 NOCOMMON 0 0 2209900200019 DATA 4 1 2209900200020 KT-DUMMY KT-DUM-ERR DATA ERR-T 2209900200021 KEV KEV MB MB 2209900200022 25. 0.5 586. 8. 2209900200023 ENDDATA 3 0 2209900200024 ENDSUBENT 23 0 2209900299999 SUBENT 22099003 20201207 22952209900300001 BIB 6 18 2209900300002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW,DERIV) 2209900300003 ANALYSIS Renormalization of kT=25 keV Maxwellian averaged 2209900300004 cross section by Macklin (655 mb). 2209900300005 The measured spectrum averaged cross section (586 mb) 2209900300006 was 2209900300007 1. multiplied by the Macklin's excitation function 2209900300008 folded by true Maxwellian shape (557 mb), 2209900300009 2. divided by the Macklin's excitation function 2209900300010 folded by the 7Li(p,n) neutron spectrum (568 mb), 2209900300011 and then 2209900300012 3. multiplied by 2/sqrt(pi)~1.13. 2209900300013 REL-REF (R,,R.L.Macklin,W,MACKLIN,1982) 2209900300014 Energy dependent cross sections before renormalization2209900300015 ERR-ANALYS (ERR-T) Total uncertainty 2209900300016 irradiation history, time factors - negligible 2209900300017 STATUS (TABLE) Table VI of Phys.Rev.C37(1988)595 2209900300018 (DEP,22099002) Spectrum-averaged cross section 2209900300019 HISTORY (20201207C) On 2209900300020 ENDBIB 18 0 2209900300021 NOCOMMON 0 0 2209900300022 DATA 3 1 2209900300023 KT DATA ERR-T 2209900300024 KEV MB MB 2209900300025 25. 648. 10. 2209900300026 ENDDATA 3 0 2209900300027 ENDSUBENT 26 0 2209900399999 SUBENT 22099004 20201207 22952209900400001 BIB 6 11 2209900400002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW,DERIV) 2209900400003 ANALYSIS Renormalization of Maxwellian averaged cross sections 2209900400004 at various temperatures by Macklin by using the ratio 2209900400005 of the value before and after normalization at 2209900400006 kT=25 keV=648(10)mb/655=0.989+/-1.5%. 2209900400007 REL-REF (R,,R.L.Macklin,W,MACKLIN,1982) 2209900400008 Energy dependent cross sections before renormalization2209900400009 ERR-ANALYS (DATA-ERR) No information on the source of uncertainty 2209900400010 STATUS (TABLE) Table VI of Phys.Rev.C37(1988)595 2209900400011 (DEP,22099003) Renormalized MACS at kT=25 keV 2209900400012 HISTORY (20201207C) On 2209900400013 ENDBIB 11 0 2209900400014 NOCOMMON 0 0 2209900400015 DATA 3 9 2209900400016 KT DATA DATA-ERR 2209900400017 KEV MB MB 2209900400018 10. 1206. 18. 2209900400019 15. 904. 13. 2209900400020 20. 746. 11. 2209900400021 30. 582. 9. 2209900400022 35. 533. 8. 2209900400023 40. 496. 7. 2209900400024 45. 467. 7. 2209900400025 50. 444. 7. 2209900400026 52. 426. 6. 2209900400027 ENDDATA 11 0 2209900400028 ENDSUBENT 27 0 2209900499999 ENDENTRY 4 0 2209999999999