ENTRY 30333 20090115 31343033300000001 SUBENT 30333001 20090115 31343033300100001 BIB 14 25 3033300100002 INSTITUTE (3HUNELU) 3033300100003 REFERENCE (J,AHP,38,(3),209,1975) 3033300100004 AUTHOR (F.Deak,S.Gueth,J.Inczedy,A.Kiss) 3033300100005 TITLE Experimental investigation of the neutron-gamma 3033300100006 competition in 14.7MeV fast neutrons reactions. 3033300100007 FACILITY (CCW) 200 keV Cockcroft-Walton accelerator. 3033300100008 INC-SOURCE (D-T) T(d,n)He-4 reaction. 3033300100009 Incoming neutrons were determined by recoil alpha 3033300100010 method. 3033300100011 SAMPLE Mn and Bi(2)-O(3) powders in thin walled plastic 3033300100012 containers. The length of the target was chosen to be 3033300100013 about one half of the mean free path of 14.7MeV neutron3033300100014 METHOD (TOF) Time of flight for emitted neutron. 3033300100015 DETECTOR (SCIN) NE 102/A plastic scintillation detector, 5 cm 3033300100016 diam. and 10 cm height, on an XP 1020 photomultiplier .3033300100017 .For detection of alpha from H-3(d,n)He-4, a thin 3033300100018 NE 102/A foil with a similar type of a photomultiplier.3033300100019 MONITOR (1-H-1(N,EL)1-H-1,,DA) 3033300100020 Water target. The standard values were 3033300100021 not mentioned. 3033300100022 PART-DET (N) Neutrons. 3033300100023 STATUS (TABLE)Data from Table 1 of Acta Phys.Hung.,38(1975)2093033300100024 HISTORY (19760526C) KO. 3033300100025 (20090125A) BIB section updated 3033300100026 ERR-ANALYS (DATA-ERR) No further information. 3033300100027 ENDBIB 25 0 3033300100028 COMMON 1 3 3033300100029 EN 3033300100030 MEV 3033300100031 1.4700E+01 3033300100032 ENDCOMMON 3 0 3033300100033 ENDSUBENT 32 0 3033300199999 SUBENT 30333002 20090115 31343033300200001 BIB 1 1 3033300200002 REACTION (25-MN-55(N,2N)25-MN-54,,SIG) 3033300200003 ENDBIB 1 0 3033300200004 NOCOMMON 0 0 3033300200005 DATA 2 1 3033300200006 DATA DATA-ERR 3033300200007 MB MB 3033300200008 6.8000E+02 3.0000E+02 3033300200009 ENDDATA 3 0 3033300200010 ENDSUBENT 9 0 3033300299999 SUBENT 30333003 20090115 31343033300300001 BIB 1 1 3033300300002 REACTION (83-BI-209(N,2N)83-BI-208,,SIG) 3033300300003 ENDBIB 1 0 3033300300004 NOCOMMON 0 0 3033300300005 DATA 2 1 3033300300006 DATA DATA-ERR 3033300300007 MB MB 3033300300008 1.8000E+03 3.0000E+02 3033300300009 ENDDATA 3 0 3033300300010 ENDSUBENT 9 0 3033300399999 SUBENT 30333004 20090115 31343033300400001 BIB 4 16 3033300400002 REACTION (25-MN-56(0,0),,TEM) 3033300400003 for evaporation of 1st neutrons. 3033300400004 ANALYSIS In Mn-55(n,2n)Mn-54 reactions, the neutron spectra of 3033300400005 1st and 2nd neutron-emissions were assumed to be fitted3033300400006 with the constant-temperature type formula, 3033300400007 A*E*(exp(-E/T)) after correction for the detector 3033300400008 efficiency. E, T and A are kinetic energy of the 3033300400009 neutron, nuclear temperature and normalization constant3033300400010 respectively. 3033300400011 MISC-COL (MISC) Nuclear temperature for evaporation of 2nd 3033300400012 neutrons. 3033300400013 COMMENT The ratio of the number from the first to the second 3033300400014 neutrons in the Mn-55(n,2n) process is, 3033300400015 3.6 +- 1.5. 3033300400016 and this indicates a strong neutron-gamma competition 3033300400017 than expectation on the usual statistical assumption. 3033300400018 ENDBIB 16 0 3033300400019 NOCOMMON 0 0 3033300400020 DATA 4 1 3033300400021 DATA DATA-ERR MISC MISC-ERR 3033300400022 MEV MEV MEV MEV 3033300400023 1.4800E+00 1.2000E-01 4.0000E-01 1.1000E-01 3033300400024 ENDDATA 3 0 3033300400025 ENDSUBENT 24 0 3033300499999 SUBENT 30333005 20090115 31343033300500001 BIB 4 16 3033300500002 REACTION (83-BI-210(0,0),,TEM) 3033300500003 for evaporation of 1st neutrons. 3033300500004 ANALYSIS In Bi-209(n,2n)Bi-208 reactions, the neutron spectra of3033300500005 1st and 2nd neutron-emissions were assumed to be fitted3033300500006 with the constant-temperature type formula, 3033300500007 A * E * (exp(-E/T)), 3033300500008 after correcting for the detector efficiency. E, T and3033300500009 A are kinetic energy of the neutron,nuclear temperature3033300500010 and normalization constant, respectively. 3033300500011 MISC-COL (MISC) Nuclear temperature for the evaporation of 3033300500012 2nd neutrons. 3033300500013 COMMENT The ratio of the number from the first to the second 3033300500014 neutron in the Bi-209(n,2n) process is, 3033300500015 1.06 +- 0.15. 3033300500016 and this indicates that the role of the gamma 3033300500017 de-excitation proved to be negligible. 3033300500018 ENDBIB 16 0 3033300500019 NOCOMMON 0 0 3033300500020 DATA 4 1 3033300500021 DATA DATA-ERR MISC MISC-ERR 3033300500022 MEV MEV MEV MEV 3033300500023 1.5100E+00 1.2000E-01 6.1000E-01 5.0000E-02 3033300500024 ENDDATA 3 0 3033300500025 ENDSUBENT 24 0 3033300599999 ENDENTRY 5 0 3033399999999