ENTRY O1005 20021127 0000O100500000001 SUBENT O1005001 20021127 0000O100500100001 BIB 14 67 O100500100002 TITLE Yields of neutron-rich isotopes around Z=28 produced O100500100003 in 30 MeV proton induced fission of U-238. O100500100004 AUTHOR (K.Kruglov, A.Andreyev, B.Bruyneel, S.S.Dean, O100500100005 S.Franchoo, M.Gorska, K.Helariutta, M.Huyse, O100500100006 Y.Kudryavtsev, W.F.Mueller, N.V.S.V.Prasad, R.Raabe, O100500100007 K.-H.Schmidt, P.Van Duppen, J.Van Roosbroeck, O100500100008 K.Van De Vel, L.Weissman) O100500100009 INSTITUTE (2BLGLVN) O100500100010 (2UK LVP) O100500100011 (2ZZZCER) O100500100012 (2GERGSI) O100500100013 (1USAMRY) O100500100014 (2FR SAC) O100500100015 REFERENCE (J,EPJ/A,14,365,2002) O100500100016 (J,NP/A,701,145,2002) O100500100017 HISTORY (20021002C) O100500100018 (20021116U) Last checking has been done. O100500100019 SAMPLE Two U-238 targets, a 10 mg/cm**2 thickness are situatedO100500100020 in a gas cell. The targets are tilted under an angle ofO100500100021 20 degree with respect to the proton beam (3 mua). O100500100022 REL-REF (R,,J.BENLLIURE+,J,NP/A,628,458,1998) O100500100023 (R,,J.BENLLIURE+,R,GSI-2000-1,29,1999) PROFI Code. O100500100024 (R,,V.RUBCHENYA,W,RUBCHENYA,2002) O100500100025 ADD-RES (COMP). The fission model PROFI. O100500100026 Comment by authors: A strong discrepancy between the O100500100027 PROFI code and RUBCHENYA's model. Our data favor the O100500100028 PROFI model. O100500100029 DETECTOR (HPGE) Two high-volume, 70% and 75%, germanium O100500100030 detectors for gamma detection. O100500100031 (SCIN) Thin plastic del'ta e-detectors for beta- O100500100032 detection. O100500100033 FACILITY (OLMS,2BLGLVN) An ion-guide laser ion source has been O100500100034 developed at the Leuven isotope separator on-line. O100500100035 METHOD (OLMS) O100500100036 COMMENT -By authors. The production rates of Co-67-70 and O100500100037 Ni-68-74 isotopes are known from earlier studies at O100500100038 LISOL . Recently, yields were deduced for the O100500100039 Co-65-66, Cu-70-76 isotopes, produced with resonant O100500100040 laser ionization and Ga-74-81 without laser ionization,O100500100041 since a significant fraction of the gallium isotopes O100500100042 survives the neutralization process. This could be O100500100043 explained by the fact that gallium atoms have a lower O100500100044 ionization potential than nickel (6.0 eV (Ga) vs. 7.6 O100500100045 eV (Ni)), thus having a higher probability to be O100500100046 ionized by plasma or by the collisions with impurity O100500100047 molecules or metastable argon atoms. O100500100048 In order to verify the consistency of our results the O100500100049 yields of some selected isotopes of Co and Ni were O100500100050 compared with the previously measured data. The resultsO100500100051 were consistent within a factor of two, showing the O100500100052 stability and reproducibility of our laser ion source. O100500100053 STATUS (TABLE) O100500100054 DECAY-DATA ((1.)29-CU-70-M,,DG,885.,0.99) O100500100055 ((2.)29-CU-71,,DG,490.,0.33) O100500100056 ((3.)29-CU-72,,DG,652.,0.60) O100500100057 ((4.)29-CU-73,,DG,450.,0.45) O100500100058 ((5.)29-CU-74,,DG,605.,0.79) O100500100059 ((6.)29-CU-75,,DG,421.,0.20) O100500100060 ((7.)29-CU-76,,DG,599.,0.60) O100500100061 ((8.)31-GA-74-G,,DG,596.,0.91) O100500100062 ((9.)31-GA-75,,DG,252.,0.29) O100500100063 ((10.)31-GA-76,,DG,563.,0.66) O100500100064 ((11.)31-GA-77,,DG,469.,0.20) O100500100065 ((12.)31-GA-78,,DG,620.,0.77) O100500100066 ((13.)31-GA-79,,DG,465.,0.24) O100500100067 ((14.)31-GA-80,,DG,659.,0.79) O100500100068 ((15.)31-GA-81,,DG,217.,0.37) O100500100069 ENDBIB 67 0 O100500100070 COMMON 1 3 O100500100071 EN O100500100072 MEV O100500100073 30. O100500100074 ENDCOMMON 3 0 O100500100075 ENDSUBENT 74 0 O100500199999 SUBENT O1005002 20021127 0000O100500200001 BIB 4 28 O100500200002 REACTION (92-U-238(P,X)ELEM/MASS,,SIG) Table 1. O100500200003 The total production rates - thus, the sum of the ratesO100500200004 of the two isomers, where applicable, are given. O100500200005 ERR-ANALYS (DATA-ERR) The uncertainty is given by authors in tableO100500200006 without any analysis. O100500200007 COMMENT -By authors. Production rates (atoms/micro-coulomb) of O100500200008 neutron - rich isotopes produced in the 30-MeV proton O100500200009 induced fission of U-238 were calculated by authors in O100500200010 units - mb, using scaling factor of 0.01 O100500200011 mb*micro-coulomb/atom for the Co, Ni and Cu. The O100500200012 gallium yields were obtained without laser ionization O100500200013 and were multiplied by 0.0182 mb*micro-coulomb/atom. O100500200014 Due to the low-production rates of the Co-65-66 O100500200015 isotopes, these rates were deduced from the number of O100500200016 detected beta-particles. Thus, one can deduce the O100500200017 production rate by subtracting the background O100500200018 beta-counting rate (lasers off) from the on-resonance O100500200019 beta-counting rate and by corrected for the cumulative O100500200020 daughter activity. O100500200021 The production rates of the gallium-isotopes were O100500200022 deduced from the number of detected gamma-rays as well O100500200023 as beta-particles. After correction for the daughter O100500200024 activity, isobaric and doubly charged isotope O100500200025 contamination, both methods gave the same results O100500200026 within the experimental accuracy. O100500200027 The production rates of the Cu-isotopes were O100500200028 determined by gamma-counting only. O100500200029 FLAG (1.) Data from the O1007. O100500200030 ENDBIB 28 0 O100500200031 NOCOMMON 0 0 O100500200032 DATA 6 28 O100500200033 ELEMENT MASS DATA DATA-ERR FLAG DECAY-FLAG O100500200034 NO-DIM NO-DIM MB PER-CENT NO-DIM NO-DIM O100500200035 27. 65. 0.07 0.03 O100500200036 27. 66. 0.1 0.04 O100500200037 27. 67. 0.16 0.05 1. O100500200038 27. 68. 0.11 0.03 1. O100500200039 27. 69. 0.07 0.03 1. O100500200040 27. 70. 0.013 0.003 1. O100500200041 28. 68. 0.16 0.03 1. O100500200042 28. 69. 0.23 0.04 1. O100500200043 28. 70. 0.28 0.05 1. O100500200044 28. 71. 0.14 0.03 1. O100500200045 28. 72. 0.05 0.01 1. O100500200046 28. 73. 0.014 0.003 1. O100500200047 28. 74. 0.002 0.0005 1. O100500200048 29. 70. 0.12 0.02 1.O100500200049 29. 71. 0.25 0.07 2.O100500200050 29. 72. 0.65 0.14 3.O100500200051 29. 73. 0.45 0.1 4.O100500200052 29. 74. 0.21 0.05 5.O100500200053 29. 75. 0.08 0.04 6.O100500200054 29. 76. 0.02 0.01 7.O100500200055 31. 74. 0.091 0.036 8.O100500200056 31. 75. 0.601 0.146 9.O100500200057 31. 76. 1.383 0.109 10.O100500200058 31. 77. 2.166 0.382 11.O100500200059 31. 78. 1.856 0.146 12.O100500200060 31. 79. 1.438 0.146 13.O100500200061 31. 80. 0.473 0.073 14.O100500200062 31. 81. 0.164 0.036 15.O100500200063 ENDDATA 30 0 O100500200064 ENDSUBENT 63 0 O100500299999 ENDENTRY 2 0 O100599999999