ENTRY C2241 20161011 C165C224100000001 SUBENT C2241001 20161011 C165C224100100001 BIB 12 46 C224100100002 TITLE Formation cross-sections and chromatographic C224100100003 separation of protactinium isotopes formed in C224100100004 proton-irradiated thorium metal C224100100005 AUTHOR (V.Radchenko,J.W.Engle,J.J.Wilson,J.R.Maassen, C224100100006 M.F.Nortier,E.R.Birnbaum,K.D.John,M.E.Fassbender) C224100100007 INSTITUTE (1USALAS) C224100100008 REFERENCE (J,RCA,104,291,2016) C224100100009 FACILITY (LINAC,1USALAS) C224100100010 INC-SOURCE Two separate experiments were performed at the Los C224100100011 Alamos Neutron Science Center at LANL using incident C224100100012 proton energies of 100 and 200MeV. In each experiment, C224100100013 the original beam energy was degraded to approximately C224100100014 half of its original value using aluminum degraders. C224100100015 SAMPLE Natural thorium foils of 99.7% purity were used in C224100100016 the experiment. The foils were of 2.5mm x 2.5mm C224100100017 approximate dimensions, with mass thicknesses ranging C224100100018 from 60.5 to 70.5 g/cm2. C224100100019 MONITOR (13-AL-27(P,X)11-NA-22,,SIG) Aluminum foils of 99.9% C224100100020 purity and 65mg/cm2 thickness were used as beam C224100100021 fluence monitors C224100100022 DETECTOR (HPGE) Thorium foils irradiated for nuclear reaction C224100100023 cross section measurements were counted on an ORTEC C224100100024 GEM10P4-70 p-type Al-windowed detector with relative C224100100025 efficiency of 10% at 1333 keV and a measured FWHM of C224100100026 1.99 keV at 1333 keV C224100100027 METHOD (ACTIV) Activation method was used. Irradiated foils C224100100028 were counted over a period of approximately 12 months, C224100100029 collecting approximately 300 spectra C224100100030 (CHSEP) A sequence of chromatographic separations was C224100100031 developed to isolate Pa isotopes from the irradiated C224100100032 Th target and subsequently remove fission and other C224100100033 activation products. In the first step, Pa was C224100100034 isolated from the bulk Th mass via anion exchange in C224100100035 hydrochloric acid media. In the second step sample C224100100036 was divided in two similarly sized target portions C224100100037 were dissolved and two slightly different methods of C224100100038 anion exchange were performed with each portion. C224100100039 After the anion exchange step, the respective Pa C224100100040 fractions were collected and subjected to extraction C224100100041 chromatography. C224100100042 ERR-ANALYS (ERR-T) Total uncertainty C224100100043 (ERR-1) Systematic uncertainty from detector C224100100044 calibration and geometry reproducibility C224100100045 (ERR-2) Systematic uncertainty in target dimensions C224100100046 (ERR-3,6.,18.) Systematic uncertainty in proton flux C224100100047 HISTORY (20161011C) Compiled by S.H. C224100100048 ENDBIB 46 0 C224100100049 COMMON 2 3 C224100100050 ERR-1 ERR-2 C224100100051 PER-CENT PER-CENT C224100100052 5.9 0.1 C224100100053 ENDCOMMON 3 0 C224100100054 ENDSUBENT 53 0 C224100199999 SUBENT C2241002 20161011 C165C224100200001 BIB 3 3 C224100200002 REACTION (90-TH-232(P,N)91-PA-232,,SIG) C224100200003 STATUS (TABLE) Data taken from tab. 3 of the reference C224100200004 DECAY-DATA (91-PA-232,1.31D,DG,387.88,0.0655) C224100200005 ENDBIB 3 0 C224100200006 NOCOMMON 0 0 C224100200007 DATA 3 12 C224100200008 EN DATA ERR-T C224100200009 MEV MB MB C224100200010 194.5 2.52 1.95 C224100200011 178.3 4.66 3.24 C224100200012 160.7 4.59 1.28 C224100200013 141.8 4.77 3.74 C224100200014 120.9 3.89 0.85 C224100200015 97. 5.3 0.82 C224100200016 90.8 2.56 2.53 C224100200017 81.7 4.49 0.39 C224100200018 72.8 5.39 0.33 C224100200019 64.9 6.87 0.86 C224100200020 56.3 6.33 0.41 C224100200021 44. 9.27 0.7 C224100200022 ENDDATA 14 0 C224100200023 ENDSUBENT 22 0 C224100299999 SUBENT C2241003 20161011 C165C224100300001 BIB 3 5 C224100300002 REACTION (90-TH-232(P,3N)91-PA-230,,SIG) C224100300003 STATUS (TABLE) Data taken from tab. 3 of the reference C224100300004 DECAY-DATA (91-PA-230,17.4D,DG,443.74,0.058, C224100300005 DG,918.50,0.083, C224100300006 DG,951.88,0.296) C224100300007 ENDBIB 5 0 C224100300008 NOCOMMON 0 0 C224100300009 DATA 3 12 C224100300010 EN DATA ERR-T C224100300011 MEV MB MB C224100300012 194.5 3.81 0.45 C224100300013 178.3 5.26 0.6 C224100300014 160.7 5.52 0.46 C224100300015 141.8 7.61 0.72 C224100300016 120.9 8.55 1.39 C224100300017 97. 13.83 2.77 C224100300018 90.8 11.9 0.74 C224100300019 81.7 13.19 0.92 C224100300020 72.8 15.46 1.11 C224100300021 64.9 18.55 1.25 C224100300022 56.3 23.05 1.48 C224100300023 44. 31.58 2.02 C224100300024 ENDDATA 14 0 C224100300025 ENDSUBENT 24 0 C224100399999 SUBENT C2241004 20161011 C165C224100400001 BIB 3 4 C224100400002 REACTION (90-TH-232(P,5N)91-PA-228,,SIG) C224100400003 STATUS (TABLE) Data taken from tab. 3 of the reference C224100400004 DECAY-DATA (91-PA-228,22.HR,DG,968.98,0.139, C224100400005 DG,964.77,0.114) C224100400006 ENDBIB 4 0 C224100400007 NOCOMMON 0 0 C224100400008 DATA 3 6 C224100400009 EN DATA ERR-T C224100400010 MEV MB MB C224100400011 90.8 6.19 0.51 C224100400012 81.7 7. 0.5 C224100400013 72.8 11.2 6.37 C224100400014 64.9 13.11 1.03 C224100400015 56.3 21.89 2.56 C224100400016 44. 66.1 7.27 C224100400017 ENDDATA 8 0 C224100400018 ENDSUBENT 17 0 C224100499999 ENDENTRY 4 0 C224199999999