ENTRY 22490 20201215 22962249000000001 SUBENT 22490001 20201215 22962249000100001 BIB 17 63 2249000100002 TITLE Neutron Capture on 179Ta 2249000100003 AUTHOR (M.Schumann,F.Kaeppeler) 2249000100004 REFERENCE (J,PR/C,60,025802,1999) Main reference 2249000100005 Details of the cadmium-difference method is 2249000100006 described in the book of K.Beckurts, K.Wirtz, Neutron 2249000100007 Physics, Springer, 1964 2249000100008 INSTITUTE (2GERKFK) 2249000100009 FACILITY (CYCLO,2GERKFK) 27 MeV proton cyclotron for sample 2249000100010 179Ta preparation via the reaction 180Hf(p,2n)179Ta 2249000100011 (REAC,2GERMPH) Triga Mark-1 Reactor - for sample 2249000100012 179Ta irradiation 2249000100013 INC-SOURCE (REAC) 2249000100014 INC-SPECT Thermal plus epithermal spectrum of the Triga Mark-1 2249000100015 reactor 2249000100016 MONIT-REF (,J.Mughabghab,B,NEUT.CS 1B,,,1984) For Gold 2249000100017 (,A.Simonits+,J,JRN,81,397,1984) For Cobalt 2249000100018 METHOD (ACTIV) 2249000100019 (STTA) 2249000100020 (CADMB) Cadmium difference method used for taking 2249000100021 into account epithermal part of the neutron spectrum 2249000100022 DETECTOR (HPGE) 2249000100023 ANALYSIS Results for sigma and res. integral were obtained 2249000100024 as the weighted mean of the values obtained with 2249000100025 Gold and Cobalt monitors 2249000100026 DECAY-DATA (73-TA-179,1.82YR,XR) 2249000100027 (73-TA-180-G,8.152HR,DG,93.331,0.0451) 2249000100028 SAMPLE Water-cooled Hafnium foil of 1 mm thickness and 1 cm 2249000100029 diameter was irradiated for 12 hr at beam current 2249000100030 30 uA. Proton energy 27 MeV was adjusted at the 2249000100031 maximum of 180Hf(n,2n)179Ta reaction cross section. 2249000100032 A number of short-lived by-products were allowed to 2249000100033 decay during storage time of 6 months. 2249000100034 Approximately 1.4 ug of 179Ta was obtained and 2249000100035 two samples were prepared by electrospraying on Al 2249000100036 backing. 2249000100037 - 1st having mass 3.71 nano-g, 179Ta atoms number 2249000100038 (1.25 +- 0.02) x 10**13, diameter 8 mm, activity 2249000100039 (1.5 +- 0.02) x 10**5 Bq. 2249000100040 - 2nd having mass 22.4 nano-g, 179Ta atoms number 2249000100041 (7.52 +- 0.20) x 10**13, diameter 10 mm, activity 2249000100042 (9.07 +- 0.15) x 10**5 Bq 2249000100043 CORRECTION Corrections were made for neutron self-absorption and 2249000100044 flux depression 2249000100045 ERR-ANALYS (ERR-T) Total error equal to quadratic sum of its 2249000100046 constituents, principal of which are given below 2249000100047 (ERR-S,1.,1.9) Statistical error for 179Ta activity 2249000100048 (ERR-1,0.7,01.) Error due to proton pile-up for 179Ta 2249000100049 (ERR-2) Error due to line intensity of 179Ta 2249000100050 (ERR-3) Error due to detector efficiency of 179Ta 2249000100051 (ERR-4) Error due to sample definition 179Ta 2249000100052 (ERR-5,,10.) Error due to flux depression 179Ta 2249000100053 (ERR-6,1.2,5.2) Error due to total activation 2249000100054 - Ta, Au,Co 2249000100055 (ERR-7,0.6,3.6) Max error due to total cadmium ratio 2249000100056 - for Ta, Au,Co 2249000100057 STATUS (TABLE) Tbl. VI from Phys.Rev.,C60(1999)025802 2249000100058 HISTORY (20001110C) + + Compiled by S.M. 2249000100059 (20001110U) Last checking has been done. 2249000100060 (20140109A) SD: SF4 was corrected in REACTION code in 2249000100061 Subent 2. Minor corrections. ERR-ANALYS updated. 2249000100062 MONITORs moved to Subents. 2249000100063 (20200117A) SD: DECAY-DATA corrected in Subent 001. 2249000100064 (20201215U) SD: DECAY-DATA corrected in Subent 001. 2249000100065 ENDBIB 63 0 2249000100066 COMMON 3 3 2249000100067 ERR-2 ERR-3 ERR-4 2249000100068 PER-CENT PER-CENT PER-CENT 2249000100069 3.5 2. 2.6 2249000100070 ENDCOMMON 3 0 2249000100071 ENDSUBENT 70 0 2249000199999 SUBENT 22490002 20140109 22382249000200001 BIB 4 6 2249000200002 REACTION (73-TA-179(N,G)73-TA-180-G,,SIG,,MXW) 2249000200003 MONITOR ((MONIT1)79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2249000200004 ((MONIT3)27-CO-59(N,G)27-CO-60,,SIG,,MXW) 2249000200005 ERR-ANALYS (MONIT1-ERR) Error of Au standard cross section 2249000200006 (MONIT3-ERR) Error of Co standard cross section 2249000200007 HISTORY (20140109A) SD: SF4=TA-180 => TA-180-G in REACTION code2249000200008 ENDBIB 6 0 2249000200009 COMMON 4 3 2249000200010 MONIT1 MONIT1-ERR MONIT3 MONIT3-ERR 2249000200011 B B B B 2249000200012 98.65 0.1 37.18 0.06 2249000200013 ENDCOMMON 3 0 2249000200014 DATA 3 1 2249000200015 EN-MEAN DATA ERR-T 2249000200016 EV B B 2249000200017 2.53E-02 932. 62. 2249000200018 ENDDATA 3 0 2249000200019 ENDSUBENT 18 0 2249000299999 SUBENT 22490003 20140109 22382249000300001 BIB 3 5 2249000300002 REACTION (73-TA-179(N,G)73-TA-180-G,,RI,,LIM) 2249000300003 MONITOR ((MONIT2)79-AU-197(N,G)79-AU-198,,RI) 2249000300004 ((MONIT4)27-CO-59(N,G)27-CO-60,,RI) 2249000300005 ERR-ANALYS (MONIT2-ERR) Error of Au standard resonance integral 2249000300006 (MONIT4-ERR) Error of Co standard resonance integral 2249000300007 ENDBIB 5 0 2249000300008 COMMON 4 3 2249000300009 MONIT2 MONIT2-ERR MONIT4 MONIT4-ERR 2249000300010 B B B B 2249000300011 1550. 25. 74. 0.13 2249000300012 ENDCOMMON 3 0 2249000300013 DATA 4 1 2249000300014 EN-MIN EN-MAX DATA ERR-T 2249000300015 EV EV B B 2249000300016 0.55 2.E+06 1216. 69. 2249000300017 ENDDATA 3 0 2249000300018 ENDSUBENT 17 0 2249000399999 ENDENTRY 3 0 2249099999999