ENTRY O1792 20091026 O041O179200000001 SUBENT O1792001 20091026 O041O179200100001 BIB 12 44 O179200100002 TITLE Search for the missing alpha-decay branch in 239Cm. O179200100003 AUTHOR (Z.Qin, W.Bruchle, D.Ackermann, K.Eberhardt, O179200100004 F.P.Hebberger, E.Jager, J.V.Kratz, P.Kuusiniemi, O179200100005 D.Liebe, G.Muenzenberg, D.Nayak, Yu.N.Novikov, O179200100006 M.Schaedel, B.Schausten, E.Schimpf, A.Semchenkov, O179200100007 B.Sulignano, P.Thoerle,X.L.Wu) O179200100008 INSTITUTE (2GERGSI) O179200100009 (3CPRIMP) O179200100010 (2GERMNZ) O179200100011 (3INDSAH) O179200100012 (4RUSLIN) O179200100013 (2GERMUN) O179200100014 REFERENCE (J,RCA,96,455,2008) O179200100015 FACILITY (LINAC,2GERGSI) The beam of 12C2+ ions was delivered byO179200100016 the Universal Linear Accelerator (UNILAC) at GSI. O179200100017 SAMPLE Th-232 targets were prepared by molecular plating O179200100018 The target consisted of three banana-shaped segments onO179200100019 15-mum thick Be with thicknesses of 900, 910, and O179200100020 1000 mg/cm**2. O179200100021 The stationary targets, 360 mg/cm**2 Th on 15 mum Be O179200100022 and 1-mum Cu catcher foils were used to confirm that noO179200100023 products were lost in the set up with the rotating O179200100024 wheel and to further reduce the background. O179200100025 METHOD (CHSEP) Actinide separation O179200100026 (GSPEC) O179200100027 DETECTOR (HPGE) A HPGe gamma-detector with 5% absolute O179200100028 efficiency at 188 keV was used to identify 239Cm by O179200100029 gamma-spectroscopic measurements. O179200100030 (SI) Passivated Implanted Planar Silicon detector. O179200100031 Samples were first measured by gamma-spectroscopy to O179200100032 monitor the chemical yield of Pm, and then were assayedO179200100033 for alpha-activities by 450 mm**2 PIPS detectors O179200100034 COMMENT *By* authors*.Cross sections were also calculated from O179200100035 the abundance and efficiency-corrected measured alpha- O179200100036 activities 238Cm and 240Cm and gamma-activities 239Cm, O179200100037 taking into account the number of 232Th atoms in the O179200100038 target, the integrated beam intensity, and assuming O179200100039 that 100% of the products of interest recoiled out of O179200100040 the target and were collected in the copper catcher O179200100041 foils. O179200100042 ERR-ANALYS (DATA-ERR).The uncertainty is reported by authors in O179200100043 table. O179200100044 STATUS (TABLE).Table 1 O179200100045 HISTORY (20091026C) SB O179200100046 ENDBIB 44 0 O179200100047 NOCOMMON 0 0 O179200100048 ENDSUBENT 47 0 O179200199999 SUBENT O1792002 20091026 O041O179200200001 BIB 1 1 O179200200002 REACTION (90-TH-232(6-C-12,6N)96-CM-238,,SIG) O179200200003 ENDBIB 1 0 O179200200004 NOCOMMON 0 0 O179200200005 DATA 4 2 O179200200006 EN DATA DATA-ERR DATA-MAX O179200200007 MEV MICRO-B MICRO-B MICRO-B O179200200008 70.0 0.8 O179200200009 74.0 0.6 0.3 O179200200010 ENDDATA 4 0 O179200200011 ENDSUBENT 10 0 O179200299999 SUBENT O1792003 20091026 O041O179200300001 BIB 5 18 O179200300002 REACTION (90-TH-232(6-C-12,5N)96-CM-239,,SIG) O179200300003 RAD-DET (96-CM-239,A) O179200300004 (95-AM-239,DG) O179200300005 DECAY-DATA (96-CM-239,2.9HR) O179200300006 (95-AM-239,11.9HR,DG,188.2,0.36,DG,146.2,0.12) O179200300007 COMMENT *By authors*.Two main gamma-lines from the EC decay of O179200300008 239Cm were observed at 188.2 and 146.2 keV, with O179200300009 absolute abundances of 36% and 12%, respectively, from O179200300010 the decay of daughter 239Am. The alpha-branch of 239Cm O179200300011 was determined to have an upper limit of less than O179200300012 1*10E-5. O179200300013 REL-REF (D,,W.Reisdorf+,J,ZP/A,343,47,1992) O179200300014 In absolute numbers, all measured cross sections are O179200300015 approximately a factor of 20 below the values O179200300016 calculated with HIVAP(see REL-REF). This discrepancy isO179200300017 not understood. However, the low cross sections O179200300018 measured in this work do not appear to be out of line O179200300019 with other reported results. O179200300020 ENDBIB 18 0 O179200300021 NOCOMMON 0 0 O179200300022 DATA 3 2 O179200300023 EN DATA DATA-ERR O179200300024 MEV MICRO-B MICRO-B O179200300025 70.0 16. 5. O179200300026 74.0 37. 13. O179200300027 ENDDATA 4 0 O179200300028 ENDSUBENT 27 0 O179200399999 SUBENT O1792004 20091026 O041O179200400001 BIB 1 1 O179200400002 REACTION (90-TH-232(6-C-12,4N)96-CM-240,,SIG) O179200400003 ENDBIB 1 0 O179200400004 NOCOMMON 0 0 O179200400005 DATA 3 2 O179200400006 EN DATA DATA-ERR O179200400007 MEV MICRO-B MICRO-B O179200400008 70.0 9.1 3. O179200400009 74.0 3.5 0.9 O179200400010 ENDDATA 4 0 O179200400011 ENDSUBENT 10 0 O179200499999 ENDENTRY 4 0 O179299999999