ENTRY A0193 20220330 A100A019300000001 SUBENT A0193001 20220330 A100A019300100001 BIB 11 62 A019300100002 TITLE A pellet method for the measurement of excitation A019300100003 functions: cross-sections for 140-Ce(p,2n)139-Pr and A019300100004 140-Ce(p,3n)138-m-Pr A019300100005 AUTHOR (S.K.Zeisler, D.W.Becker) A019300100006 INSTITUTE (2GERDKZ) German Cancer Research Center A019300100007 REFERENCE (J,NIM/B,160,216,2000) A019300100008 FACILITY (CYCLO,2GERDKZ) A019300100009 METHOD (STTA,BCINT,GSPEC) A019300100010 DETECTOR (HPGE) A019300100011 SAMPLE A cylindrical pellet was formed from commercially A019300100012 available natural cerium dioxide powder CeO2 99.9% A019300100013 The tablet was weighed on an analytical scale and its A019300100014 thickness measured with a precision of 0.001 mm to A019300100015 determine the material density for stopping power A019300100016 calculations as well as the amount of target atoms. A019300100017 The dimensions of a typical pellet were: diameter 13 mmA019300100018 height 6.4 mm, weight 3.9 g. The pellet was glued A019300100019 onto an aluminum block and the surface precut on the A019300100020 rotation microtome for precise adjustment after A019300100021 irradiation. The holder was finally placed into a A019300100022 helium-cooled aluminum target body. A019300100023 One hour after the end of bombardment, the aluminum A019300100024 block with the pellet was removed from the target A019300100025 holder and mounted into the microtome. A019300100026 The pellet was cut into thin slices of 4 mum each. A019300100027 10 slices of 4 mum each were combined, equaling a A019300100028 sample of 40 mum thickness. A019300100029 COMMENT - By author - abstract: A019300100030 the cross-section measurement of particle-induced A019300100031 nuclear reactions is commonly performed using the A019300100032 stacked foil method. If the target material is fragile A019300100033 or sensitive to air or moisture, this technique is A019300100034 hardly practical. This communication describes a new A019300100035 method for the simple, reliable and precise A019300100036 determination of cross-sections. A pressed pellet of aA019300100037 stable compound of the desired element is irradiated A019300100038 and then cut into thin slices with a microtome. The A019300100039 radionuclides in each slice are measured and the A019300100040 cross-sections for the nuclear reactions involved are A019300100041 derived by standard equations. The feasibility of the A019300100042 pellet method was demonstrated by measuring the A019300100043 excitation functions of the 140Ce(p,2n)139 Pr and A019300100044 140Ce(p,3n)138-m-Pr reactions. The calculated results A019300100045 were in good agreement with the experimental yield A019300100046 obtained from thick target irradiations. A019300100047 ERR-ANALYS (ERR-T) The total errors in the measured cross-sectionsA019300100048 were estimated by taking square roots of the sums of A019300100049 the squares of the individual errors A019300100050 (ERR-1) Uncertainty in particle flux; A019300100051 (ERR-2) Uncertainty in number of target nuclei; A019300100052 (ERR-3,2.,29.) Uncertainty in radioactivity A019300100053 measurement. A019300100054 (EN-ERR) The errors due to the uncertainty of the A019300100055 cerium stopping power were estimated. For the lowest A019300100056 energy of 12.57 MeV, the mean error amounts to A019300100057 0.45 MeV (3.6%). A019300100058 HISTORY (20000508C) A019300100059 (20080611A) BIB section updated A019300100060 Corrections were made according new EXFOR rules and A019300100061 N.Otsuka and A.Nichols remarks. A019300100062 (20220330A) SD: Corrections in all Subents. ERR-ANALYS A019300100063 updated. A019300100064 ENDBIB 62 0 A019300100065 COMMON 2 3 A019300100066 ERR-1 ERR-2 A019300100067 PER-CENT PER-CENT A019300100068 6.5 6. A019300100069 ENDCOMMON 3 0 A019300100070 ENDSUBENT 69 0 A019300199999 SUBENT A0193002 20220330 A100A019300200001 BIB 4 7 A019300200002 REACTION (58-CE-140(P,3N)59-PR-138-M,,SIG) A019300200003 DECAY-DATA (59-PR-138-M,2.02HR,DG,1037.8,1.01, A019300200004 DG,788.7,1., A019300200005 DG,302.7,0.80) A019300200006 STATUS (TABLE) Tbl.1 from Nucl.Instr.Meth.,B160(2000)216 A019300200007 HISTORY (20220330A) SD: SF9=EXP deleted from REACTION code. A019300200008 STATUS added. A019300200009 ENDBIB 7 0 A019300200010 NOCOMMON 0 0 A019300200011 DATA 4 41 A019300200012 EN EN-ERR DATA ERR-T A019300200013 MEV MEV MB MB A019300200014 32.22 0.02 330. 29. A019300200015 32.03 0.02 335. 30. A019300200016 31.83 0.03 310. 28. A019300200017 31.63 0.03 319. 29. A019300200018 31.43 0.04 300. 27. A019300200019 31.23 0.04 319. 29. A019300200020 31.03 0.06 272. 24. A019300200021 30.83 0.06 323. 29. A019300200022 30.63 0.07 304. 28. A019300200023 30.43 0.07 245. 23. A019300200024 30.22 0.08 212. 19. A019300200025 30.02 0.08 280. 26. A019300200026 29.81 0.09 254. 23. A019300200027 29.60 0.09 255. 23. A019300200028 29.39 0.10 229. 21. A019300200029 29.18 0.10 173. 16. A019300200030 28.97 0.12 229. 21. A019300200031 28.76 0.12 189. 17. A019300200032 28.54 0.13 200. 18. A019300200033 28.33 0.13 146. 13. A019300200034 28.11 0.14 179. 17. A019300200035 27.90 0.14 164. 15. A019300200036 27.68 0.15 163. 15. A019300200037 27.46 0.15 154. 14. A019300200038 27.24 0.16 143. 14. A019300200039 27.01 0.16 124. 11. A019300200040 26.79 0.17 109. 11. A019300200041 26.56 0.17 97. 9. A019300200042 26.34 0.18 82. 8. A019300200043 26.11 0.18 66. 7. A019300200044 25.88 0.20 62. 6. A019300200045 25.65 0.20 51. 6. A019300200046 25.41 0.21 38. 4. A019300200047 25.18 0.21 27. 4. A019300200048 24.94 0.22 21. 3. A019300200049 24.70 0.22 16. 3. A019300200050 24.46 0.23 11. 1. A019300200051 24.22 0.23 13. 2. A019300200052 23.98 0.24 7. 1. A019300200053 23.48 0.25 5. 1. A019300200054 22.98 0.26 3. 1. A019300200055 ENDDATA 43 0 A019300200056 ENDSUBENT 55 0 A019300299999 SUBENT A0193003 20220330 A100A019300300001 BIB 6 15 A019300300002 REACTION (58-CE-140(P,2N)59-PR-139,,SIG) A019300300003 RAD-DET (58-CE-139-G,DG) It is daughter of Pr-139. A019300300004 DECAY-DATA (58-CE-139-G,137.5D,DG,165.9,0.80) A019300300005 COMMENT - By Author - A019300300006 1. In the first series of spectra, when yield of A019300300007 Pr-138m was measured, no Ce-139 could be found which A019300300008 indicates that the 140-Ce(p,n+p)139-Ce reaction must A019300300009 have a very low cross section at proton energy below A019300300010 32 MeV. For the process no cross section data have beenA019300300011 published yet. A019300300012 2. Ce-139 gamma spectra was recorded after three days A019300300013 to measure quantitatively the long-lived radioisotopes.A019300300014 STATUS (TABLE) Tbl.2 from Nucl.Instr.Meth.,B160(2000)216 A019300300015 HISTORY (20220330A) SD: SF9=EXP deleted from REACTION code. A019300300016 STATUS added. A019300300017 ENDBIB 15 0 A019300300018 NOCOMMON 0 0 A019300300019 DATA 4 76 A019300300020 EN EN-ERR DATA ERR-T A019300300021 MEV MEV MB MB A019300300022 32.22 0.02 419. 79. A019300300023 32.03 0.02 375. 74. A019300300024 31.83 0.03 418. 81. A019300300025 31.63 0.03 417. 76. A019300300026 31.43 0.04 422. 86. A019300300027 31.23 0.04 482. 80. A019300300028 31.03 0.06 420. 70. A019300300029 30.83 0.06 556. 90. A019300300030 30.63 0.07 490. 100. A019300300031 30.43 0.07 425. 85. A019300300032 30.22 0.08 359. 115. A019300300033 30.02 0.08 554. 89. A019300300034 29.81 0.09 502. 87. A019300300035 29.60 0.09 581. 89. A019300300036 29.39 0.10 503. 82. A019300300037 29.18 0.10 430. 81. A019300300038 28.97 0.12 582. 85. A019300300039 28.76 0.12 556. 81. A019300300040 28.54 0.13 627. 90. A019300300041 28.33 0.13 501. 83. A019300300042 28.11 0.14 642. 92. A019300300043 27.90 0.14 741. 126. A019300300044 27.68 0.15 759. 108. A019300300045 27.46 0.15 783. 106. A019300300046 27.24 0.16 829. 113. A019300300047 27.01 0.16 848. 111. A019300300048 26.79 0.17 899. 115. A019300300049 26.56 0.17 945. 114. A019300300050 26.34 0.18 908. 107. A019300300051 26.11 0.18 1046. 0129. A019300300052 25.88 0.20 1066. 0129. A019300300053 25.65 0.20 952. 117. A019300300054 25.41 0.21 1090. 0126. A019300300055 25.18 0.21 1117. 0126. A019300300056 24.94 0.22 1074. 0127. A019300300057 24.70 0.22 1245. 0149. A019300300058 24.46 0.23 1197. 0140. A019300300059 24.22 0.23 1233. 0134. A019300300060 23.98 0.24 1202. 0136. A019300300061 23.73 0.24 1098. 0127. A019300300062 23.48 0.25 1305. 0148. A019300300063 23.23 0.25 1147. 0142. A019300300064 22.98 0.26 1326. 0150. A019300300065 22.73 0.26 1159. 0142. A019300300066 22.47 0.27 1209. 0140. A019300300067 22.21 0.28 1180. 0151. A019300300068 21.95 0.29 1015. 0122. A019300300069 21.69 0.29 1083. 0125. A019300300070 21.43 0.30 1155. 0134. A019300300071 21.16 0.30 1138. 0136. A019300300072 20.89 0.31 1206. 0137. A019300300073 20.62 0.31 1268. 0155. A019300300074 20.34 0.32 1127. 0133. A019300300075 20.06 0.32 1042. 0122. A019300300076 19.78 0.33 1068. 0135. A019300300077 19.50 0.33 998. 147. A019300300078 19.21 0.34 1016. 0118. A019300300079 18.92 0.34 968. 129. A019300300080 18.62 0.35 978. 126. A019300300081 18.33 0.36 988. 117. A019300300082 18.03 0.37 955. 127. A019300300083 17.72 0.37 832. 107. A019300300084 17.41 0.38 806. 96. A019300300085 17.10 0.38 805. 106. A019300300086 16.78 0.39 756. 95. A019300300087 16.46 0.39 787. 137. A019300300088 16.14 0.40 606. 87. A019300300089 15.81 0.40 560. 96. A019300300090 15.47 0.41 430. 73. A019300300091 15.13 0.41 384. 73. A019300300092 14.78 0.42 260. 63. A019300300093 14.43 0.42 232. 40. A019300300094 14.07 0.44 148. 36. A019300300095 13.71 0.44 67. 22. A019300300096 12.95 0.45 102. 31. A019300300097 12.57 0.45 40. 11. A019300300098 ENDDATA 78 0 A019300300099 ENDSUBENT 98 0 A019300399999 ENDENTRY 3 0 A019399999999