ENTRY E1888 20050914 E032E188800000001 SUBENT E1888001 20050914 E032E188800100001 BIB 12 36 E188800100002 TITLE alpha-decays of neutron-deficient americium isotopes E188800100003 AUTHOR (M.Sakama, M.Asai, K.Tsukada, S.Ichikawa, I.Nishinaka, E188800100004 Y.Nagame, H.Haba, S.Goto, M.Shibata, K.Kawade, E188800100005 Y.Kojima, Y.Oura, M.Ebihara, H.Nakahara) E188800100006 INSTITUTE (2JPNTKS) Department of Radiologic Science and E188800100007 Engineering, School of Health Sciences E188800100008 (2JPNJAE) Advanced Science Research Center E188800100009 (2JPNIPC) Cyclotron Center E188800100010 (2JPNNII) Department of Chemistry E188800100011 (2JPNNAG) Radioisotope Research Center E188800100012 (2JPNNAG) Department of Energy Engineering and Science E188800100013 (2JPNHIR) Graduate School of Engineering E188800100014 (2JPNTMU) Department of Chemistry E188800100015 REFERENCE (J,PR/C,69,(1),014308,200401) E188800100016 INC-SOURCE Beam intensity is 250 to 340 particle-nA. E188800100017 SAMPLE - Target enrichment is unknown. E188800100018 - Chemical-form of target: UO2(NO3)2 E188800100019 - Backing is aluminium. UO2(NO3)2 in 2-propanol is E188800100020 electrodeposited onto aluminum backing foil. E188800100021 - Backing-thickness is 0.9 mg/cm**2. E188800100022 METHOD (STTA) A stack of 21 targets set in a multiple-target E188800100023 chamber with 5 mm spacing E188800100024 (HEJET) Products attached to the PbI2 aerosol clusters E188800100025 were swept out of the target chamber E188800100026 (OLMS) JAERI-ISOL. Mass resolution of A/Delta A is E188800100027 about 850 at the mass number A=208 [S. Ichikawa E188800100028 et al., Nucl. Instrum. Methods B187(2002)548]. E188800100029 FACILITY (VDGT,2JPNJAE) E188800100030 ANALYSIS (DECAY) E188800100031 DETECTOR (SI) To measure alpha particles with efficiency of E188800100032 85%. Energy resolution is about 45 keV. E188800100033 (GELI) To measure X rays following EC decay. Coaxial E188800100034 type. FWHM= 0.66 keV at 122 keV gamma-ray. E188800100035 STATUS (TABLE) Data taken from Table 1, p014308-7 in E188800100036 reference E188800100037 HISTORY (20040414C) Kc + On E188800100038 ENDBIB 36 0 E188800100039 NOCOMMON 0 0 E188800100040 ENDSUBENT 39 0 E188800199999 SUBENT E1888002 20050914 E032E188800200001 BIB 5 11 E188800200002 REL-REF (D,,H.L.Hall+,R,LBL-27878,1989) E188800200003 Energy and intensity of alpha for 236Am are 6410 keV E188800200004 and (4.2+-0.6)e-4 in this work. E188800200005 REACTION (92-U-235(3-LI-6,5N)95-AM-236,,SIG,,AV) E188800200006 DECAY-DATA (95-AM-236,3.1MIN,A,6150.,4.0E-5) E188800200007 Decay data in present experiment. T1/2= 3.1+-1.3 min E188800200008 and intensity I=(4.0+-1.0)e-5. E188800200009 (95-AM-236,3.6MIN,XR) E188800200010 Decay data in present experiment. T1/2= 3.6+-0.1 min. E188800200011 SAMPLE Target-thickness is 0.16 to 0.42 mg/cm**2. E188800200012 ERR-ANALYS (DATA-ERR) No information on source of uncertainties E188800200013 ENDBIB 11 0 E188800200014 COMMON 2 3 E188800200015 EN-MIN EN-MAX E188800200016 MEV MEV E188800200017 39.0 48.0 E188800200018 ENDCOMMON 3 0 E188800200019 DATA 2 1 E188800200020 DATA DATA-ERR E188800200021 MICRO-B MICRO-B E188800200022 125.0 46.0 E188800200023 ENDDATA 3 0 E188800200024 ENDSUBENT 23 0 E188800299999 SUBENT E1888003 20050914 E032E188800300001 BIB 7 17 E188800300002 REL-REF (A,,J.Guo+,J,ZP/A,355,(2),111,199607) E188800300003 Half-life of 235Am is 15+-5 min in this work. E188800300004 REACTION (92-U-233(3-LI-6,4N)95-AM-235,,SIG,,AV) E188800300005 DECAY-DATA (95-AM-235,10.7MIN,A,6457.,4.0E-3) E188800300006 Decay data in present experiment. T1/2= 10.7+-0.7 min E188800300007 and intensity I=(4.0+-0.5)e-3. E188800300008 (95-AM-235,9.5MIN,XR) E188800300009 Decay data in present experiment. T1/2= 9.5+-1.2 min. E188800300010 SAMPLE Target-thickness is 0.05 to 0.13 mg/cm**2. E188800300011 DETECTOR (GE) Used for alpha-gamma and gamma-gamma coincidence E188800300012 measurements. E188800300013 ERR-ANALYS (DATA-ERR) No information on source of uncertainties E188800300014 COMMENT Comment by authors: No alpha-gamma coincidence event E188800300015 was observed. This result suggests that the level fed E188800300016 by the 6457 keV alpha transition is either the ground E188800300017 state of 231Np or a low lying level that decays via E188800300018 internal conversion. E188800300019 ENDBIB 17 0 E188800300020 COMMON 2 3 E188800300021 EN-MIN EN-MAX E188800300022 MEV MEV E188800300023 34.0 42.0 E188800300024 ENDCOMMON 3 0 E188800300025 DATA 2 1 E188800300026 DATA DATA-ERR E188800300027 MICRO-B MICRO-B E188800300028 31.0 12.0 E188800300029 ENDDATA 3 0 E188800300030 ENDSUBENT 29 0 E188800399999 SUBENT E1888004 20050914 E032E188800400001 BIB 7 14 E188800400002 REL-REF (D,,H.L.Hall+,J,PR/C,41,(2),618,199002) E188800400003 Energy and intensity of alpha for 234Am are 6460 keV E188800400004 and (3.9+-1.2)e-4 in this work. E188800400005 REACTION (92-U-233(3-LI-6,5N)95-AM-234,,SIG,,AV) E188800400006 DECAY-DATA (95-AM-234,,A) E188800400007 The 6.46 MeV alpha group for 234Am reported by Hall is E188800400008 not observed. E188800400009 (95-AM-234,3.5MIN,XR) E188800400010 Decay data in present experiment. T1/2= 3.5+-1.3 min. E188800400011 RAD-DET (94-PU-234,A) E188800400012 SAMPLE Target-thickness is 0.05 to 0.13 mg/cm**2. E188800400013 METHOD (COINC) Detect alphas in coincidence. Alpha chain from E188800400014 234Pu to 210Pb is detected. E188800400015 ERR-ANALYS (DATA-ERR) No information on source of uncertainties E188800400016 ENDBIB 14 0 E188800400017 COMMON 2 3 E188800400018 EN-MIN EN-MAX E188800400019 MEV MEV E188800400020 39.0 48.0 E188800400021 ENDCOMMON 3 0 E188800400022 DATA 2 1 E188800400023 DATA DATA-ERR E188800400024 MICRO-B MICRO-B E188800400025 9.0 5.0 E188800400026 ENDDATA 3 0 E188800400027 ENDSUBENT 26 0 E188800499999 SUBENT E1888005 20050914 E032E188800500001 BIB 5 14 E188800500002 REL-REF (A,,R.L.Hahn+,J,NP/A,113,(1),206,196805) E188800500003 Half-life, alpha energy and abundance of 229Np is E188800500004 4.0+-0.2 min, 6890+-20 keV, and larger than 0.50, E188800500005 respectively, in this work. E188800500006 REACTION (92-U-233(3-LI-6,6N)95-AM-233,,SIG,,AV) E188800500007 DECAY-DATA (95-AM-233,3.2MIN,A,6780.) E188800500008 Decay data in present experiment. T1/2= 3.2+-0.8 min E188800500009 and intensity I>3e-2. E188800500010 (93-NP-229,4.0MIN,A,6893.,0.68) E188800500011 Decay data in present experiment. T1/2= 4.0+-0.4 min E188800500012 and intensity I= 0.68+-0.11. E188800500013 SAMPLE Target-thickness is 0.05 to 0.13 mg/cm**2. E188800500014 METHOD (COINC) Detect alphas in coincidence. Alpha chain from E188800500015 225Pa to 213At is detected. E188800500016 ENDBIB 14 0 E188800500017 COMMON 2 3 E188800500018 EN-MIN EN-MAX E188800500019 MEV MEV E188800500020 52.0 60.0 E188800500021 ENDCOMMON 3 0 E188800500022 DATA 1 1 E188800500023 DATA-MAX E188800500024 MICRO-B E188800500025 0.9 E188800500026 ENDDATA 3 0 E188800500027 ENDSUBENT 26 0 E188800599999 ENDENTRY 5 0 E188899999999