ENTRY A0470 20030103 0000A047000000001 SUBENT A0470001 20030103 0000A047000100001 BIB 13 55 A047000100002 TITLE Complete and incomplete fusion reactions in 12-C+89-Y: A047000100003 excitation functions and recoil range measurements A047000100004 REFERENCE (J,PR/C,57,743,199802) A047000100005 AUTHOR (B.Bindu Kumar, S.Mukherjee, S.Chakrabarty, B.S.Tomar, A047000100006 A.Goswami, S.B.Manohar) A047000100007 INSTITUTE (3INDIND) School of studies in physics, Vikram A047000100008 university A047000100009 (3INDTRM) Radiochemistry division A047000100010 COMMENT Abstract. Excitation functions and recoil range A047000100011 distributions for radioactive products formed in the A047000100012 reactions of 12-C on 89-Y have been measured using A047000100013 catcher foil technique followed by gamma-ray A047000100014 spectrometry. The alpha emission products show higher A047000100015 cross sections than that predicted for complete fusion.A047000100016 Recoil range distributions of evaporation residues A047000100017 indicate incomplete momentum transfer events. DetailedA047000100018 Monte Carlo simulation of the shapes of recoil range A047000100019 distributions for these processes have been carried outA047000100020 using PACE2 code to extract the contributions of A047000100021 incomplete fusion in the individual channels. From theA047000100022 relative yields of incomplete fusion products the A047000100023 excitation energy and angular momentum of the A047000100024 incompletely fused composite nucleus have been deduced.A047000100025 The values agree well with the break-up fusion model ofA047000100026 the incomplete fusion. A047000100027 FACILITY (VDGT,3INDTRM) BARC-TIFR Pelletron Accelerator A047000100028 METHOD (STTA) Stacks consisting of two self-supporting targetsA047000100029 of yttrium (1 mg/cm**2) separated by aluminum foils (2A047000100030 mg/cm**2) A047000100031 (EXTB) Three irradiations were carried out for each A047000100032 such stack of target and degraders encompassing the A047000100033 beam energy between 70 and 87 MeV for 12-C. A047000100034 (ACTIV) The irradiation time of around 2 hours was A047000100035 selected according to the half lives of the A047000100036 radioisotopes produced. The total charge collected forA047000100037 each irradiation was around 700 micro-Coulombs. A047000100038 (BCINT) An electron suppressed faraday cup placed A047000100039 behind the target assembly. A047000100040 (GSPEC) Each foil was counted for 300 seconds durationA047000100041 immediately after activation. Subsequently, the foils A047000100042 were recounted for successively longer durations over aA047000100043 period of two weeks. A047000100044 DETECTOR (HPGE) A047000100045 ANALYSIS (DECAY,AREA) A047000100046 HISTORY (20021231C) A047000100047 (20030103U) Last checking has been done. A047000100048 STATUS (CURVE) By CAJAD. A047000100049 ERR-ANALYS (EN-ERR) It is half of target thickness. Compiler read A047000100050 the value from figure, approximately. A047000100051 -By author. The energies at the target are the averageA047000100052 values of the incident and outgoing projectile A047000100053 energies. A047000100054 (ERR-T) The uncertainty is shown on figure without any A047000100055 analysis A047000100056 ADD-RES (RANGE) A047000100057 ENDBIB 55 0 A047000100058 COMMON 1 3 A047000100059 EN-ERR A047000100060 MEV A047000100061 0.75 A047000100062 ENDCOMMON 3 0 A047000100063 ENDSUBENT 62 0 A047000199999 SUBENT A0470002 20030103 0000A047000200001 BIB 2 2 A047000200002 REACTION (39-Y-89(6-C-12,3N)45-RH-98-G,,SIG) A047000200003 DECAY-DATA (45-RH-98-G,9.05MIN,DG,652.,0.942) A047000200004 ENDBIB 2 0 A047000200005 NOCOMMON 0 0 A047000200006 DATA 3 6 A047000200007 EN DATA ERR-T A047000200008 MEV MB PER-CENT A047000200009 70.83 81.1 3. A047000200010 76.32 34.3 2.9 A047000200011 79.56 14.7 6. A047000200012 82.17 8.6 10. A047000200013 84.16 7.2 7. A047000200014 86.72 5.7 9. A047000200015 ENDDATA 8 0 A047000200016 ENDSUBENT 15 0 A047000299999 SUBENT A0470003 20030103 0000A047000300001 BIB 2 6 A047000300002 REACTION (39-Y-89(6-C-12,4N)45-RH-97,,SIG) A047000300003 Production cross section isomer and ground states were A047000300004 measured. A047000300005 DECAY-DATA (45-RH-97-M,44.3MIN,DG,188.,0.512) Isomer transition =A047000300006 5.6%. A047000300007 (45-RH-97-G,31.1MIN,DG,421.,0.75) A047000300008 ENDBIB 6 0 A047000300009 NOCOMMON 0 0 A047000300010 DATA 3 6 A047000300011 EN DATA ERR-T A047000300012 MEV MB PER-CENT A047000300013 70.87 148. 5. A047000300014 76.32 103. 5. A047000300015 79.44 55.5 3. A047000300016 82.19 39.2 6. A047000300017 84.24 35. 4. A047000300018 86.67 25.8 7. A047000300019 ENDDATA 8 0 A047000300020 ENDSUBENT 19 0 A047000399999 SUBENT A0470004 20030103 0000A047000400001 BIB 2 3 A047000400002 REACTION (39-Y-89(6-C-12,5N)45-RH-96-G,M+,SIG) A047000400003 DECAY-DATA (45-RH-96-G,9.89MIN,DG,832.,1.) A047000400004 (45-RH-96-M,1.51MIN) Isomer transition = 60%. A047000400005 ENDBIB 3 0 A047000400006 NOCOMMON 0 0 A047000400007 DATA 3 6 A047000400008 EN DATA ERR-T A047000400009 MEV MB PER-CENT A047000400010 70.88 17.1 5. A047000400011 76.31 27.3 8. A047000400012 79.51 18.4 10. A047000400013 82.15 19. 8. A047000400014 84.15 19.1 13. A047000400015 86.66 19.3 11. A047000400016 ENDDATA 8 0 A047000400017 ENDSUBENT 16 0 A047000499999 SUBENT A0470005 20030103 0000A047000500001 BIB 3 5 A047000500002 REACTION (39-Y-89(6-C-12,X)44-RU-97,IND,SIG) X=P+3N A047000500003 DECAY-DATA (44-RU-97,2.9D,DG,215.,0.858) A047000500004 CORRECTION The correction for the Rh-97 contribution was carried A047000500005 out by subtracting the Rh-97 cross section measured A047000500006 independently. A047000500007 ENDBIB 5 0 A047000500008 NOCOMMON 0 0 A047000500009 DATA 3 6 A047000500010 EN DATA ERR-T A047000500011 MEV MB PER-CENT A047000500012 71.08 586. 4. A047000500013 76.34 464. 4. A047000500014 79.54 285. 4. A047000500015 82.23 220. 3. A047000500016 84.28 192. 4. A047000500017 86.71 158. 5. A047000500018 ENDDATA 8 0 A047000500019 ENDSUBENT 18 0 A047000599999 SUBENT A0470006 20030103 0000A047000600001 BIB 3 5 A047000600002 REACTION (39-Y-89(6-C-12,X)44-RU-95,CUM,SIG) X=P+5N A047000600003 DECAY-DATA (44-RU-95,1.64HR,DG,336.,1.) A047000600004 COMMENT - By compiler. The authors could not exclude Ru-95 A047000600005 production due to radioactive decay of both isomers of A047000600006 Rh-95. A047000600007 ENDBIB 5 0 A047000600008 NOCOMMON 0 0 A047000600009 DATA 3 5 A047000600010 EN DATA ERR-T A047000600011 MEV MB PER-CENT A047000600012 76.3 6.5 14. A047000600013 79.57 13.9 4. A047000600014 82.23 22.5 4. A047000600015 84.38 35.7 6. A047000600016 86.84 48. 3. A047000600017 ENDDATA 7 0 A047000600018 ENDSUBENT 17 0 A047000699999 SUBENT A0470007 20030103 0000A047000700001 BIB 2 3 A047000700002 REACTION (39-Y-89(6-C-12,X)43-TC-96,,SIG) X=2P+3N A047000700003 In the case the measured yield includes both states. A047000700004 DECAY-DATA (43-TC-96-G,4.28D,DG,778.,1.) A047000700005 ENDBIB 3 0 A047000700006 NOCOMMON 0 0 A047000700007 DATA 3 6 A047000700008 EN DATA ERR-T A047000700009 MEV MB PER-CENT A047000700010 70.93 19.2 5. A047000700011 76.26 51. 8. A047000700012 79.45 53.4 5. A047000700013 82.12 60. 7. A047000700014 84.1 73. 5. A047000700015 86.65 78. 6. A047000700016 ENDDATA 8 0 A047000700017 ENDSUBENT 16 0 A047000799999 SUBENT A0470008 20030103 0000A047000800001 BIB 4 11 A047000800002 REACTION (39-Y-89(6-C-12,X)43-TC-95-G,IND,SIG) X=2P+4N aA047000800003 DECAY-DATA (43-TC-95-G,20.HR,DG,765.,0.939) A047000800004 CORRECTION The correction for the Ru-95 contribution was carried A047000800005 out by subtracting the Ru-95 cross section measured A047000800006 independently. A047000800007 MISC-COL (MISC1) Contribution of complete fusion reaction A047000800008 cross section. A047000800009 (MISC1-ERR) The uncertainty of MISC-1. A047000800010 (MISC2) Contribution of incomplete fusion reaction A047000800011 cross section. A047000800012 (MISC2-ERR) The uncertainty of MISC-2. A047000800013 ENDBIB 11 0 A047000800014 NOCOMMON 0 0 A047000800015 DATA 7 6 A047000800016 EN DATA ERR-T MISC1 MISC1-ERR MISC2 A047000800017 MISC2-ERR A047000800018 MEV MB PER-CENT MB MB MB A047000800019 MB A047000800020 70.76 189. 6. A047000800021 A047000800022 76.04 207. 4. A047000800023 A047000800024 79.32 148. 2.7 A047000800025 A047000800026 82.16 138. 4. A047000800027 A047000800028 84.07 140. 4. 59.3 5.1 33.8A047000800029 3.4 A047000800030 86.5 128. 4. A047000800031 A047000800032 ENDDATA 16 0 A047000800033 ENDSUBENT 32 0 A047000899999 SUBENT A0470009 20030103 0000A047000900001 BIB 4 10 A047000900002 REACTION (39-Y-89(6-C-12,X)43-TC-94-G,IND,SIG) X=2P+5N A047000900003 DECAY-DATA (43-TC-94-G,4.9HR,DG,871.,1.) A047000900004 COMMENT -By compiler. Production cross section of Tc-94 groundA047000900005 state due to radioactive decay of Ru-94 is negligible. A047000900006 MISC-COL (MISC1) Contribution of complete fusion reaction A047000900007 cross section. A047000900008 (MISC1-ERR) The uncertainty of MISC-1. A047000900009 (MISC2) Contribution of incomplete fusion reaction A047000900010 cross section. A047000900011 (MISC2-ERR) The uncertainty of MISC-2. A047000900012 ENDBIB 10 0 A047000900013 NOCOMMON 0 0 A047000900014 DATA 7 6 A047000900015 EN DATA ERR-T MISC1 MISC1-ERR MISC2 A047000900016 MISC2-ERR A047000900017 MEV MB PER-CENT MB MB MB A047000900018 MB A047000900019 70.73 102. 5. A047000900020 A047000900021 76.22 71. 7. A047000900022 A047000900023 79.38 48. 6. A047000900024 A047000900025 82.17 51. 8. A047000900026 A047000900027 84.09 65. 5. 66.4 4.4 61.7A047000900028 6.2 A047000900029 86.65 77. 8. A047000900030 A047000900031 ENDDATA 16 0 A047000900032 ENDSUBENT 31 0 A047000999999 SUBENT A0470010 20030103 0000A047001000001 BIB 3 8 A047001000002 REACTION (39-Y-89(6-C-12,X)43-TC-93,(CUM),SIG) X=2P+6N A047001000003 DECAY-DATA (43-TC-93-G,2.75HR,DG,1363.,0.658) A047001000004 MISC-COL (MISC1) Contribution of complete fusion reaction A047001000005 cross section. A047001000006 (MISC1-ERR) The uncertainty of MISC-1. A047001000007 (MISC2) Contribution of incomplete fusion reaction A047001000008 cross section. A047001000009 (MISC2-ERR) The uncertainty of MISC-2. A047001000010 ENDBIB 8 0 A047001000011 NOCOMMON 0 0 A047001000012 DATA 7 6 A047001000013 EN DATA ERR-T MISC1 MISC1-ERR MISC2 A047001000014 MISC2-ERR A047001000015 MEV MB PER-CENT MB MB MB A047001000016 MB A047001000017 70.9 17.8 10. A047001000018 A047001000019 76.28 50. 16. A047001000020 A047001000021 79.42 55. 7. A047001000022 A047001000023 82.09 63. 5. A047001000024 A047001000025 84.19 85. 5. 79. 3. 7.9A047001000026 0.8 A047001000027 86.69 92. 4. A047001000028 A047001000029 ENDDATA 16 0 A047001000030 ENDSUBENT 29 0 A047001099999 SUBENT A0470011 20030103 0000A047001100001 BIB 3 8 A047001100002 REACTION (39-Y-89(6-C-12,X)42-MO-93-M,IND,SIG) X=3P+5N A047001100003 DECAY-DATA (42-MO-93-M,6.85HR,DG,685.,0.997) A047001100004 MISC-COL (MISC1) Contribution of complete fusion reaction A047001100005 cross section. A047001100006 (MISC1-ERR) The uncertainty of MISC-1. A047001100007 (MISC2) Contribution of incomplete fusion reaction A047001100008 cross section. A047001100009 (MISC2-ERR) The uncertainty of MISC-2. A047001100010 ENDBIB 8 0 A047001100011 NOCOMMON 0 0 A047001100012 DATA 7 6 A047001100013 EN DATA ERR-T MISC1 MISC1-ERR MISC2 A047001100014 MISC2-ERR A047001100015 MEV MB PER-CENT MB MB MB A047001100016 MB A047001100017 70.77 9.5 12. A047001100018 A047001100019 76.1 29.2 10. A047001100020 A047001100021 79.19 37.6 5. A047001100022 A047001100023 82.06 46.9 5. A047001100024 A047001100025 84.05 66. 5. 50.4 3.2 13.4A047001100026 1.4 A047001100027 86.71 83. 8. A047001100028 A047001100029 ENDDATA 16 0 A047001100030 ENDSUBENT 29 0 A047001199999 SUBENT A0470012 20030103 0000A047001200001 BIB 3 5 A047001200002 REACTION (39-Y-89(6-C-12,X)41-NB-92-M,IND,SIG) X=4P+5N A047001200003 DECAY-DATA (41-NB-92-M,10.15D,DG,934.,1.) A047001200004 MISC-COL (MISC) Contribution of incomplete fusion reaction crossA047001200005 section. A047001200006 (MISC-ERR) The uncertainty of MISC. A047001200007 ENDBIB 5 0 A047001200008 NOCOMMON 0 0 A047001200009 DATA 5 6 A047001200010 EN DATA ERR-T MISC MISC-ERR A047001200011 MEV MB PER-CENT MB MB A047001200012 70.81 3.76 6. A047001200013 76.16 3.08 7. A047001200014 79.38 2.2 14. A047001200015 82.09 1.79 15. A047001200016 84.14 1.81 16. 0.88 0.28 A047001200017 86.64 1.61 17. A047001200018 ENDDATA 8 0 A047001200019 ENDSUBENT 18 0 A047001299999 SUBENT A0470013 20030103 0000A047001300001 BIB 4 8 A047001300002 REACTION (39-Y-89(6-C-12,X)41-NB-90,(CUM),SIG) X=4P+7N A047001300003 DECAY-DATA (41-NB-90-G,14.6HR,DG,1129.,0.9266) A047001300004 MISC-COL (MISC) Contribution of incomplete fusion reaction crossA047001300005 section. A047001300006 (MISC-ERR) The uncertainty of MISC. A047001300007 COMMENT - By authors. Nb-90 is not formed by alpha transfer A047001300008 from C-12 to Y-89. Instead it may be formed by two A047001300009 proton transfer followed by emission of one neutron. A047001300010 ENDBIB 8 0 A047001300011 NOCOMMON 0 0 A047001300012 DATA 5 5 A047001300013 EN DATA ERR-T MISC MISC-ERR A047001300014 MEV MB PER-CENT MB MB A047001300015 76.32 4.2 14. A047001300016 79.35 7.8 21. A047001300017 82.16 11.9 12. A047001300018 84.01 17.8 12. 17.3 2.3 A047001300019 86.59 22.6 9. A047001300020 ENDDATA 7 0 A047001300021 ENDSUBENT 20 0 A047001399999 ENDENTRY 13 0 A047099999999