ENTRY B0092 20190120 B029B009200000001 SUBENT B0092001 20190120 B029B009200100001 BIB 8 45 B009200100002 TITLE B-10 and B-11 production cross sections in C-12 B009200100003 spallation by protons and alpha particles. B009200100004 Application to cosmic ray propagation B009200100005 AUTHOR (P.Fontes) B009200100006 INSTITUTE (2FR CSN) B009200100007 REFERENCE (J,PR/C,15,2159,1977) B009200100008 SAMPLE Stacks consisting of high purity graphite sheets, B009200100009 thickness 1 and/or 0.2 mm, containing less than 5 ppb B009200100010 of natural boron. The number and the thickness of the B009200100011 sheets used for an experiment depended on the energy B009200100012 of the incident particles. Due to the small energy lossB009200100013 in the individual foils the stack was obviously not B009200100014 used for energy degradation but rather for production B009200100015 of several targets per run. B009200100016 METHOD (INTB,SITA,ASEP) B009200100017 After irradiation one graphite sheet per analysis was B009200100018 burnt on a small Au-disk on which most of spallation B009200100019 products remained after total combustion. Combustion B009200100020 was performed at temperatures below 700 centigrades, B009200100021 where escape of volatile boron compounds was checked B009200100022 to be small (less than 5% uncertainty in the cross B009200100023 sections). B009200100024 In all cases B-11/B-10 ratios were measured by means B009200100025 of a mass separator. The boron ionization efficiency B009200100026 relative to that of Be was strongly increased by B009200100027 deposit of about 1 mg of high purity water on the B009200100028 combustion residue. B009200100029 Data were corrected for isotopic discrimination of the B009200100030 mass separator which was determined using a standard B009200100031 boric acid sample. B009200100032 The natural boron content of the targets was determinedB009200100033 from blank graphite sheets. B009200100034 ERR-ANALYS (DATA-ERR) The errors given for the ratios and the dataB009200100035 are standard errors coming from mass peak ratio B009200100036 measurement and from determination of the B009200100037 discrimination factor of the spectrometer. Included B009200100038 are the uncertainties of the monitor cross sections. B009200100039 (MONIT-ERR) Any information is absent. B009200100040 HISTORY (19781213C) Lakw B009200100041 (19940711A) Some corrections have been included by B009200100042 CAJAD B009200100043 (19980610A) Lower case. Monitor is corrected. B009200100044 (20011010U) Last checking has been done. B009200100045 (20190120A) So NDS, corrected SF3 for 002 to X. B009200100046 Delete SF9=EXP from all subentries.B009200100047 ENDBIB 45 0 B009200100048 NOCOMMON 0 0 B009200100049 ENDSUBENT 48 0 B009200199999 SUBENT B0092002 20190120 B029B009200200001 BIB 10 60 B009200200002 REACTION R((6-C-12(P,X)5-B-11,CUM,SIG)/ B009200200003 (6-C-12(P,X)5-B-10,CUM,SIG)) B009200200004 1(6-C-12(P,X)5-B-11,CUM,SIG) B009200200005 2(6-C-12(P,X)5-B-10,CUM,SIG) B009200200006 PART-DET (5-B-11) B009200200007 (5-B-10) B009200200008 Due to the method applied in all cases - also for the B009200200009 absolute cross sections - B-11/B-10 mass ratios were B009200200010 measured As primary quantity (see under method). B009200200011 FACILITY (SYNCY,2FR PAR) Used for protons from 41 to 150 MeV B009200200012 (SYNCY,2ZZZCER) Used for protons of 600 MeV B009200200013 (SYNCH,2ZZZCER) Used for protons of 25000 MeV B009200200014 MONITOR ((MONIT)6-C-12(P,X)4-BE-7,,SIG) B009200200015 This monitor reaction was used to normalize the B009200200016 formation cross sections of the individual boron B009200200017 isotopes. B009200200018 MONIT-REF (B0092002,P.Fontes,J,PR/C,15,2159,1977) B009200200019 The cross sections given were compiled by the author B009200200020 using data of B009200200021 J.B.Cumming,ann.Rev.Nucl.Sci.13,261(1963)(see B0022006)B009200200022 J.Tobailem et al.,CEA-N-1466(1)(1971) B009200200023 P.J.Lindstrom et al.,LBL-3650 B009200200024 J.B.Radin et al.,LBL-2680(1974) B009200200025 DECAY-MON (4-BE-7,,DG,477.) B009200200026 FLAG (1.) Sample consisting of a stack of 0.2 mm thick B009200200027 sheets, total thickness was about 1 mm B009200200028 (2.) Sample consisting of a stack containing sheets B009200200029 of 0.2 and 1 mm thickness B009200200030 (3.) Sample consisting of a stack of 12 sheets each B009200200031 1 mm thick B009200200032 METHOD 1(MOMIX) B009200200033 Absolute B-11 cross sections were determined by means B009200200034 of the isotope dilution method using an isotope B009200200035 separator for implanting of a defined amount of B-11 B009200200036 into the irradiated targets. From the B-11/B-10 data B009200200037 in these implanted targets and the separately measured B009200200038 cross section ratio the absolute B-11 cross section B009200200039 was obtained after normalization to the known and B009200200040 additionally measured Be-7 formation cross section and B009200200041 correction for the natural boron content. B009200200042 It was experimentally tested that the differing depth B009200200043 distributions for implanted (superficial layer) and B009200200044 spallative (all depths) boron lead to equal extraction B009200200045 rates within 5%. B009200200046 2(MOMIX) B009200200047 Absolute B-10 cross sections were determined by means B009200200048 of the isotope dilution method using an isotope B009200200049 separator for implanting of a defined amount of B-10 B009200200050 into the irradiated targets. From the B-11/B-10 data B009200200051 in these implanted targets and the separately measured B009200200052 cross section ratio the absolute B-10 cross section B009200200053 was obtained after normalization to the known and B009200200054 additionally measured Be-7 formation cross section and B009200200055 correction for the natural boron content. B009200200056 It was experimentally tested that the differing depth B009200200057 distributions for implanted (superficial layer) and B009200200058 spallative (all depths) boron lead to equal extraction B009200200059 rates within 5%. B009200200060 STATUS (TABLE) Table I of Phys.Rev.C.,15,2159,1977. B009200200061 HISTORY (20190120A) So NDS, corrected SF3 for 002 to X. B009200200062 ENDBIB 60 0 B009200200063 NOCOMMON 0 0 B009200200064 DATA 10 5 B009200200065 EN DATA RDATA-ERR RDATA 1DATA-ERR 1DATA 2B009200200066 DATA-ERR 2FLAG MONIT MONIT-ERR B009200200067 MEV NO-DIM NO-DIM MB MB MB B009200200068 MB NO-DIM MB MB B009200200069 41. 6.2 0.4 98.5 20. 15.8B009200200070 3. 1. 21.5 3.5 B009200200071 49. 4.3 0.2 98. 20. 22.5B009200200072 4.3 1. 23.3 3.5 B009200200073 150. 3.35 0.15 63. 13. 19.B009200200074 3.4 2. 12.2 1.2 B009200200075 600. 3. 0.15 75. 15. 25.B009200200076 4.5 2. 11. 1.1 B009200200077 25000. 3. 0.15 59. 12. 20.B009200200078 3.2 3. 9.1 0.4 B009200200079 ENDDATA 14 0 B009200200080 ENDSUBENT 79 0 B009200299999 SUBENT B0092003 20190120 B029B009200300001 BIB 9 54 B009200300002 REACTION R((6-C-12(A,X)5-B-11,CUM,SIG)/ B009200300003 (6-C-12(A,X)5-B-10,CUM,SIG)) B009200300004 1(6-C-12(A,X)5-B-11,CUM,SIG) B009200300005 2(6-C-12(A,X)5-B-10,CUM,SIG) B009200300006 PART-DET (5-B-11) B009200300007 (5-B-10) B009200300008 due to the method applied in all cases - also for the B009200300009 absolute cross sections - B-11/B-10 mass ratios were B009200300010 measured As primary quantity (see under method). B009200300011 FACILITY (SYNCY,2FR PAR) B009200300012 MONITOR ((MONIT)6-C-12(A,X)4-BE-7,CUM,SIG) B009200300013 this monitor reaction was used to normalize the B009200300014 formation cross sections of the individual boron B009200300015 isotopes. B009200300016 MONIT-REF (B0092003,P.Fontes,J,PR/C,15,2159,1977) B009200300017 The cross sections given were compiled by the author B009200300018 using data of B009200300019 P.J.Lindstrom et al.,LBL-3650 B009200300020 J.B.Radin et al.,LBL-2680(1974) B009200300021 DECAY-MON (4-BE-7,,DG,477.) B009200300022 METHOD 1(MOMIX) B009200300023 Absolute B-11 cross sections were determined by means B009200300024 of the isotope dilution method using an isotope B009200300025 separator for implanting of a defined amount of B-11 B009200300026 into the irradiated targets. From the B-11/B-10 data B009200300027 in these implanted targets and the separately measured B009200300028 cross section ratio the absolute B-11 cross section B009200300029 was obtained after normalization to the known and B009200300030 additionally measured Be-7 formation cross section and B009200300031 correction for the natural boron content. B009200300032 It was experimentally tested that the differing depth B009200300033 distributions for implanted (superficial layer) and B009200300034 spallative (all depths) boron lead to equal extraction B009200300035 rates within 5%. B009200300036 2(MOMIX) B009200300037 Absolute B-10 cross sections were determined by means B009200300038 of the isotope dilution method using an isotope B009200300039 separator for implanting of a defined amount of B-10 B009200300040 into the irradiated targets. From the B-11/B-10 data B009200300041 in these implanted targets and the separately measured B009200300042 cross section ratio the absolute B-10 cross section B009200300043 was obtained after normalization to the known and B009200300044 additionally measured Be-7 formation cross section and B009200300045 correction for the natural boron content. B009200300046 It was experimentally tested that the differing depth B009200300047 distributions for implanted (superficial layer) and B009200300048 spallative (all depths) boron lead to equal extraction B009200300049 rates within 5%. B009200300050 COMMENT In the publication an energy region from 100 to B009200300051 160 MeV is given. It is uncertain, whether or not this B009200300052 range reflects an energy degradation in the specific B009200300053 carbon foil-stack used for the alpha-irradiation B009200300054 (comment by the compiler). B009200300055 STATUS (TABLE) Table I+II of Phys.Rev.15(1977)2159 B009200300056 ENDBIB 54 0 B009200300057 NOCOMMON 0 0 B009200300058 DATA 10 1 B009200300059 EN-MIN EN-MAX DATA RDATA-ERR RDATA 1DATA-ERR 1B009200300060 DATA 2DATA-ERR 2MONIT MONIT-ERR B009200300061 MEV MEV NO-DIM NO-DIM MB MB B009200300062 MB MB MB MB B009200300063 100. 160. 3. 0.15 114. 17.B009200300064 38. 7. 30. 4. B009200300065 ENDDATA 6 0 B009200300066 ENDSUBENT 65 0 B009200399999 ENDENTRY 3 0 B009299999999