ENTRY D6044 20090123 D066D604400000001 SUBENT D6044001 20090123 D066D604400100001 BIB 14 57 D604400100002 TITLE Fragment angular momenta in low and medium energy D604400100003 fission of 242-Pu D604400100004 AUTHOR (B.S.Tomar, A.Goswami, S.K.Das, T.Datta, D604400100005 B.K.Srivastava, A.G.C.Nair, Satya Prakash, D604400100006 M.V.Ramaniah) D604400100007 INSTITUTE (3INDTRM) D604400100008 REFERENCE (J,ZP/A,327,225,1987) D604400100009 FACILITY (CYCLO,3INDVEC) Variable energy cyclotron at D604400100010 Calcutta (VECC) D604400100011 SAMPLE Uranium foils of thickness 71 mg/cm**2 covered with D604400100012 6.75 mg/cm**2 thick superpure aluminium foils were D604400100013 Irradiated with 40.0 p/m 0.4 MeV alpha particle beam D604400100014 at VECC, Calcutta with beam current of 1.0-2.0 micro D604400100015 ampere. D604400100016 DETECTOR (HPGE) The resultant precipitate of silver antiomonide,D604400100017 dissolved in dil. HNO3, was counted on a 45 cc HPGe D604400100018 detector coupled to a 4 K MCA in live time. The D604400100019 resolution of the detector was 2.2 keV at 1332 keV. D604400100020 The gamma spectra indicated that there was no D604400100021 contamination from other fission products in the D604400100022 separated antimony isotopes. D604400100023 METHOD (REC,RCHEM,GSPEC) After the irradiation, the front D604400100024 side catcher of the irradiated target was dissolved D604400100025 with NaOH in presence of antimony carrier. Antimony D604400100026 was separated from the active solution by distilling D604400100027 antimony hydride and collecting into silver nitrate D604400100028 solution. The resultant precipitate of silver D604400100029 antiomonide, dissolved in dil. HNO3, was counted on D604400100030 a 45 cc HPGe detector coupled to a 4 K MCA in live D604400100031 time mode. D604400100032 ANALYSIS (AREA) From the photopeak areas of the gamma rays of D604400100033 The nuclides' independent isomeric yields were D604400100034 determined using usual decay-growth equations after D604400100035 for correcting the precursor contribution. D604400100036 ERR-ANALYS (DATA-ERR) The error on an individual measurement is D604400100037 about 15 % which is the compounded error due to D604400100038 counting statistics, the uncertainties on the D604400100039 gamma-ray abundances, the fractional cumulative yield D604400100040 (FCY) 128-Sn, the irradiation and separation times D604400100041 and the half lives. The errors quoted on the mean D604400100042 isomeric yield ratios are the precision of the D604400100043 measurements. D604400100044 MISC-COL (MISC) fission fragment angular momenta (Jrms) D604400100045 HISTORY (20090123C) Compiled by Mr. Paresh Prajapati of The D604400100046 M.S. University of Baroda, Dr. Sarbjit Singh and D604400100047 Dr. H. Naik of Radiochemistry Divison of B.A.R.C, D604400100048 Mumbai. D604400100049 STATUS (APRVD) By Dr.B.S.Tomar, RCD, BARC D604400100050 COMMENT fragment angular momenta estimated from the measured D604400100051 isomer ratios using the statistical model analysis D604400100052 showed significantly larger fragment angular momenta D604400100053 in the medium energy fissioning system compared to D604400100054 the low energy fissioning system. This has been D604400100055 attributed to the effect of higher excitation energy D604400100056 and angular momentum in the entrance channel leading D604400100057 to increased fragment temperature, moments of inertia D604400100058 and angular velocity. D604400100059 ENDBIB 57 0 D604400100060 NOCOMMON 0 0 D604400100061 ENDSUBENT 60 0 D604400199999 SUBENT D6044002 20090123 D066D604400200001 BIB 3 6 D604400200002 REACTION (92-U-238(A,F)51-SB-128-G/T,IND,FY/RAT) D604400200003 DECAY-DATA (51-SB-128-G,9.01HR,DG,743.41,1.0, D604400200004 DG,754.06,1.0) D604400200005 (51-SB-128-M,10.4MIN,DG,743.41,0.96, D604400200006 DG,754.06,0.964) D604400200007 STATUS (TABLE) Data taken from the table No.1 D604400200008 ENDBIB 6 0 D604400200009 COMMON 1 3 D604400200010 EN D604400200011 MEV D604400200012 34.0 D604400200013 ENDCOMMON 3 0 D604400200014 DATA 4 1 D604400200015 DATA DATA-ERR MISC MISC-ERR D604400200016 NO-DIM NO-DIM NO-DIM NO-DIM D604400200017 0.76 0.08 13.3 1.3 D604400200018 ENDDATA 3 0 D604400200019 ENDSUBENT 18 0 D604400299999 ENDENTRY 2 0 D604499999999