ENTRY 33020 20081127 31363302000000001 SUBENT 33020001 20081127 31363302000100001 BIB 14 53 3302000100002 TITLE Fragment angular momenta in low and medium energy 3302000100003 fission of 242-Pu 3302000100004 AUTHOR (B.S.Tomar, A.Goswami, S.K.Das, T.Datta, 3302000100005 B.K.Srivastava, A.G.C.Nair, Satya Prakash, 3302000100006 M.V.Ramaniah) 3302000100007 INSTITUTE (3INDTRM) 3302000100008 REFERENCE (J,ZP/A,327,225,1987) 3302000100009 FACILITY (REAC,3INDTRM) Research Reactor CIRUS in B.A.R.C, 3302000100010 Trombay, Mumbai 3302000100011 SAMPLE Encapsulated solutions containing approximately 1 3302000100012 micro gram of 241-Pu were irradiated pneumatically at 3302000100013 a neutron flux of 1.0x10**13 n/cm2/sec. 3302000100014 DETECTOR (HPGE) The resultant precipitate of silver antiomonide,3302000100015 dissolved in dil. HNO3, was counted on a 45 cc HPGe 3302000100016 detector coupled to a 4 K MCA in live time. The 3302000100017 resolution of the detector was 2.2 keV at 1332 keV. 3302000100018 The gamma spectra indicated that there was no 3302000100019 contamination from other fission products in the 3302000100020 separated antimony isotopes. 3302000100021 METHOD (RCHEM,GSPEC) After the irradiation antimony was 3302000100022 separated from the irradiated target solution by 3302000100023 distilling antimony hydride and collecting into 3302000100024 silver nitrate solution. The resultant precipitate of 3302000100025 silver antiomonide, dissolved in dil. HNO3, was counted3302000100026 on a 45 cc HPGe detector coupled to a 4 K MCA in live 3302000100027 time. 3302000100028 ANALYSIS (AREA) From the photopeak areas of the gamma rays of 3302000100029 the nuclides' independent isomeric yields were 3302000100030 determined using usual decay-growth equations after 3302000100031 correcting for the precursor contribution. 3302000100032 ERR-ANALYS (DATA-ERR) The error on an individual measurement is 3302000100033 about 15 % which is the compounded error due to 3302000100034 counting statistics, the uncertainties on the 3302000100035 gamma-ray abundances, the fractional cumulative yield 3302000100036 (fCY)128-Sn, the irradiation and separation 3302000100037 times and the half lives. The errors quoted on the 3302000100038 mean isomeric yield ratios are the precision of the 3302000100039 measurements. 3302000100040 MISC-COL (MISC) fission fragment angular momenta Jrms 3302000100041 HISTORY (20081127C) Compiled by Mr. Paresh Prajapati of The 3302000100042 M.S. University of Baroda, Dr. Sarbjit Singh and 3302000100043 Dr. H. Naik of Radiochemistry Divison of B.A.R.C, 3302000100044 Mumbai. 3302000100045 STATUS (APRVD) By Dr.B.S.Tomar, RCD, BARC 3302000100046 COMMENT fragment angular momenta estimated from the measured 3302000100047 isomer ratios using the statistical model analysis 3302000100048 showed significantly larger fragment angular momenta 3302000100049 in the medium energy fissioning system compared to 3302000100050 the low energy fissioning system. This has been 3302000100051 attributed to the effect of higher excitation energy 3302000100052 and angular momentum in the entrance channel leading 3302000100053 to increased fragment temperature, moments of inertia 3302000100054 and angular velocity. 3302000100055 ENDBIB 53 0 3302000100056 COMMON 1 3 3302000100057 EN-DUMMY 3302000100058 EV 3302000100059 0.0253 3302000100060 ENDCOMMON 3 0 3302000100061 ENDSUBENT 60 0 3302000199999 SUBENT 33020002 20081127 31363302000200001 BIB 3 6 3302000200002 REACTION (94-PU-241(N,F)51-SB-128-G/T,IND,FY/RAT,,SPA) 3302000200003 DECAY-DATA (51-SB-128-G,9.01HR,DG,743.41,1.0, 3302000200004 DG,754.06,1.0) 3302000200005 (51-SB-128-M,10.4MIN,DG,743.41,0.96, 3302000200006 DG,754.06,0.964) 3302000200007 STATUS (TABLE)Data taken from the table No.1 3302000200008 ENDBIB 6 0 3302000200009 NOCOMMON 0 0 3302000200010 DATA 4 1 3302000200011 DATA DATA-ERR MISC MISC-ERR 3302000200012 NO-DIM NO-DIM NO-DIM NO-DIM 3302000200013 0.53 0.08 8.1 1.2 3302000200014 ENDDATA 3 0 3302000200015 ENDSUBENT 14 0 3302000299999 ENDENTRY 2 0 3302099999999