ENTRY O2329 20191223 O073O232900000001 SUBENT O2329001 20191223 O073O232900100001 BIB 16 42 O232900100002 TITLE Spontaneously fissioning isomers in U, Pu, Am O232900100003 and Cm isotopes O232900100004 AUTHOR (S.M.Polikanov,G.Sletten) O232900100005 INSTITUTE (2DENNBI) O232900100006 REFERENCE (J,NP/A,151,656,1970) O232900100007 FACILITY (VDGT,2DENNBI) Tandem Van de Graaff accelerator O232900100008 SAMPLE The targets were produced by vacuum evaporation of O232900100009 oxides onto 1 mg/cm2 nickel foil. The target material O232900100010 was distributed over a spot 6-7 cm in diam., and O232900100011 targets were cut from this foil with a surgical knife O232900100012 or with a punch. The target thickness varied from 10 O232900100013 to about 30mu-g/cm2. This gives recoil yields higher O232900100014 than 70% at the beam energies used. O232900100015 DETECTOR (FISCH) The detectors are polycarbonate O232900100016 foils (Makrofol) O232900100017 (SIBAR) O232900100018 MONITOR (95-AM-243(D,P)95-AM-244-L,,SIG) O232900100019 The cross sections are calculated comparing the isomerO232900100020 yields with the yield of the 1 ms 244mAm under O232900100021 identical conditions O232900100022 MONIT-REF (,S.Bjornholm+,J,SNP,8,267,1969) O232900100023 DECAY-MON (95-AM-244-L,1.MICROSEC) O232900100024 METHOD Two methods used. The first method is based on the O232900100025 detection of fission-in-flight of nuclei recoiling out O232900100026 of a thin target by means of polycarbonate, fission O232900100027 track detectors. O232900100028 In the second method, the delayed fissions are O232900100029 detected by a surface barrier semiconductor counter. O232900100030 Half-lives shorter than 900 ns are measured by the O232900100031 fission-in-flight method. The 900 ns 237Np and the O232900100032 longer lived ones are measured by the ring counter O232900100033 method and pulsed beam. O232900100034 REL-REF (M,O2328001,N.L.Lark+,J,NP/A,139,481,1969) - method O232900100035 ADD-RES Unpublished results by Gangrsky and Sletten indicate O232900100036 even lower limits for fission decays with T/2 longer O232900100037 than 1 ms are given in Tbl.3. O232900100038 ERR-ANALYS (ERR-T) Total uncertainty O232900100039 (ERR-1,,10.) The largest variation in target thickness O232900100040 was about 20%. This means that the maximum variation O232900100041 in recoil yield was kept within +-10%. O232900100042 STATUS (TABLE) Tbl.2 from Nucl.Phys.,A151(1970)656 O232900100043 HISTORY (20191223C) SD O232900100044 ENDBIB 42 0 O232900100045 COMMON 1 3 O232900100046 MONIT O232900100047 MICRO-B O232900100048 0.7 O232900100049 ENDCOMMON 3 0 O232900100050 ENDSUBENT 49 0 O232900199999 SUBENT O2329002 20191223 O073O232900200001 BIB 3 3 O232900200002 REACTION (92-U-238(D,X)92-U-238-L,,SIG) O232900200003 DECAY-DATA (92-U-238-L,200.NSEC,SF) O232900200004 SAMPLE (92-U-238,ENR=0.9951) O232900200005 ENDBIB 3 0 O232900200006 NOCOMMON 0 0 O232900200007 DATA 4 1 O232900200008 EN HL-ERR DATA ERR-T O232900200009 MEV NSEC MICRO-B MICRO-B O232900200010 13.0 70. 0.4 0.2 O232900200011 ENDDATA 3 0 O232900200012 ENDSUBENT 11 0 O232900299999 SUBENT O2329003 20191223 O073O232900300001 BIB 3 3 O232900300002 REACTION (93-NP-237(D,2N)94-PU-237-L,,SIG) O232900300003 DECAY-DATA (94-PU-237-L,900.NSEC,SF) O232900300004 SAMPLE (93-NP-237,ENR=1.) O232900300005 ENDBIB 3 0 O232900300006 NOCOMMON 0 0 O232900300007 DATA 4 1 O232900300008 EN HL-ERR DATA ERR-T O232900300009 MEV NSEC MICRO-B MICRO-B O232900300010 13.0 150. 0.5 0.2 O232900300011 ENDDATA 3 0 O232900300012 ENDSUBENT 11 0 O232900399999 SUBENT O2329004 20191223 O073O232900400001 BIB 3 3 O232900400002 REACTION (94-PU-239(D,X)94-PU-239-L,,SIG) O232900400003 DECAY-DATA (94-PU-239-L,8.MICROSEC,SF) O232900400004 SAMPLE (94-PU-239,ENR=0.9990) O232900400005 ENDBIB 3 0 O232900400006 NOCOMMON 0 0 O232900400007 DATA 4 1 O232900400008 EN HL-ERR DATA ERR-T O232900400009 MEV NSEC MICRO-B MICRO-B O232900400010 13.0 1. 0.7 0.3 O232900400011 ENDDATA 3 0 O232900400012 ENDSUBENT 11 0 O232900499999 SUBENT O2329005 20191223 O073O232900500001 BIB 3 3 O232900500002 REACTION (94-PU-238(D,P)94-PU-239-L,,SIG) O232900500003 DECAY-DATA (94-PU-239-L,8.MICROSEC,SF) O232900500004 SAMPLE (94-PU-238,ENR=0.9948) O232900500005 ENDBIB 3 0 O232900500006 NOCOMMON 0 0 O232900500007 DATA 4 1 O232900500008 EN HL-ERR DATA ERR-T O232900500009 MEV NSEC MICRO-B MICRO-B O232900500010 13.0 1. 1.0 0.4 O232900500011 ENDDATA 3 0 O232900500012 ENDSUBENT 11 0 O232900599999 SUBENT O2329006 20191223 O073O232900600001 BIB 3 3 O232900600002 REACTION (94-PU-241(D,X)94-PU-241-L,,SIG) O232900600003 DECAY-DATA (94-PU-241-L,27.MICROSEC,SF) O232900600004 SAMPLE (94-PU-241,ENR=0.957) O232900600005 ENDBIB 3 0 O232900600006 NOCOMMON 0 0 O232900600007 DATA 4 1 O232900600008 EN HL-ERR DATA ERR-T O232900600009 MEV NSEC MICRO-B MICRO-B O232900600010 13.0 3. 1.1 0.4 O232900600011 ENDDATA 3 0 O232900600012 ENDSUBENT 11 0 O232900699999 SUBENT O2329007 20191223 O073O232900700001 BIB 3 3 O232900700002 REACTION (94-PU-240(D,P)94-PU-241-L,,SIG) O232900700003 DECAY-DATA (94-PU-241-L,27.MICROSEC,SF) O232900700004 SAMPLE (94-PU-240,ENR=0.9894) O232900700005 ENDBIB 3 0 O232900700006 NOCOMMON 0 0 O232900700007 DATA 4 1 O232900700008 EN HL-ERR DATA ERR-T O232900700009 MEV NSEC MICRO-B MICRO-B O232900700010 13.0 3. 0.9 0.4 O232900700011 ENDDATA 3 0 O232900700012 ENDSUBENT 11 0 O232900799999 SUBENT O2329008 20191223 O073O232900800001 BIB 3 3 O232900800002 REACTION (94-PU-238(P,2N)95-AM-237-L,,SIG) O232900800003 DECAY-DATA (95-AM-237-L,5.NSEC,SF) O232900800004 SAMPLE (94-PU-238,ENR=0.9948) O232900800005 ENDBIB 3 0 O232900800006 NOCOMMON 0 0 O232900800007 DATA 4 1 O232900800008 EN HL-ERR DATA ERR-T O232900800009 MEV NSEC MICRO-B MICRO-B O232900800010 13.0 2. 0.7 0.4 O232900800011 ENDDATA 3 0 O232900800012 ENDSUBENT 11 0 O232900899999 SUBENT O2329009 20191223 O073O232900900001 BIB 3 3 O232900900002 REACTION (95-AM-243(D,X)95-AM-243-L,,SIG) O232900900003 DECAY-DATA (95-AM-243-L,6.5MICROSEC,SF) O232900900004 SAMPLE (95-AM-243,ENR=1.) O232900900005 ENDBIB 3 0 O232900900006 NOCOMMON 0 0 O232900900007 DATA 4 1 O232900900008 EN HL-ERR DATA ERR-T O232900900009 MEV NSEC MICRO-B MICRO-B O232900900010 13.0 1.0 1.8 0.6 O232900900011 ENDDATA 3 0 O232900900012 ENDSUBENT 11 0 O232900999999 SUBENT O2329010 20191223 O073O232901000001 BIB 3 3 O232901000002 REACTION (94-PU-244(P,2N)95-AM-243-L,,SIG) O232901000003 DECAY-DATA (95-AM-243-L,6.5MICROSEC,SF) O232901000004 SAMPLE (94-PU-244,ENR=0.9906) O232901000005 ENDBIB 3 0 O232901000006 NOCOMMON 0 0 O232901000007 DATA 4 1 O232901000008 EN HL-ERR DATA ERR-T O232901000009 MEV NSEC MICRO-B MICRO-B O232901000010 13.0 1.0 20. 10. O232901000011 ENDDATA 3 0 O232901000012 ENDSUBENT 11 0 O232901099999 SUBENT O2329011 20191223 O073O232901100001 BIB 3 3 O232901100002 REACTION (95-AM-241(D,2N)96-CM-241-L,,SIG) O232901100003 DECAY-DATA (96-CM-241-L,19.NSEC,SF) O232901100004 SAMPLE (95-AM-241,ENR=0.9811) O232901100005 ENDBIB 3 0 O232901100006 NOCOMMON 0 0 O232901100007 DATA 4 1 O232901100008 EN HL-ERR DATA ERR-T O232901100009 MEV NSEC MICRO-B MICRO-B O232901100010 13.0 8. 0.1 0.05 O232901100011 ENDDATA 3 0 O232901100012 ENDSUBENT 11 0 O232901199999 SUBENT O2329012 20191223 O073O232901200001 BIB 3 3 O232901200002 REACTION (95-AM-243(D,2N)96-CM-243-L,,SIG) O232901200003 DECAY-DATA (96-CM-243-L,38.NSEC,SF) O232901200004 SAMPLE (95-AM-243,ENR=1.) O232901200005 ENDBIB 3 0 O232901200006 NOCOMMON 0 0 O232901200007 DATA 4 1 O232901200008 EN HL-ERR DATA ERR-T O232901200009 MEV NSEC MICRO-B MICRO-B O232901200010 13.0 10. 0.3 0.2 O232901200011 ENDDATA 3 0 O232901200012 ENDSUBENT 11 0 O232901299999 ENDENTRY 12 0 O232999999999