ENTRY C2883 20230112 C288300000001 SUBENT C2883001 20230112 20240316 C288300100001 BIB 11 38 C288300100002 TITLE Angular Distribution of Neutrons Produced by 40- and C288300100003 80-Mev Alpha Particles on a Thick Tantalum Target C288300100004 AUTHOR (W.W.Wadman) C288300100005 REL-REF (O,14818001,W.W.Wadman,R,UCRL-11375,1964) Neutron C288300100006 measurements. C288300100007 REFERENCE (J,HP,11,659,1965) C288300100008 (R,UCRL-11375,1964) Similar to J,HP,11,659,1965 C288300100009 INSTITUTE (1USABRK) C288300100010 FACILITY (CYCLO,1USABRK) The 88-Inch Cyclotron at Berkeley. C288300100011 DETECTOR (NAICR) 3-in. diam 3-in. long NaI(Tl) crystal and a C288300100012 400-channel pulse-height analyzer. A collection of C288300100013 threshold detectors was used: 58Ni(n,p)58Co, C288300100014 59Co(n,alpha)56Mn, 65Cu(n,p)65Ni, 27Al(n,alpha)24Na, C288300100015 203Th(n,2n)202Tl, 127I(n,2n)126I, and 58Ni(n,2n)57Ni. C288300100016 SAMPLE The target was made of tantalum, and measured 2.5 in. C288300100017 in diameter and 0.25 in. thick. This dimension was C288300100018 adequate for stopping the alpha particles and for C288300100019 covering the end of the copper Faraday cup in which C288300100020 it was mounted. C288300100021 METHOD (TTM) The experiment involved a target of a selected C288300100022 material, a means of measuring the beam particle C288300100023 current, the selected threshold detectors, a device C288300100024 to mount the detectors at predetermined positions, C288300100025 and a means to suppress secondary emission electrons C288300100026 from escaping the current-measuring device. Each C288300100027 threshold detector was counted at 3.0 cm from the C288300100028 actual face of the NaI crystal. The resultant C288300100029 gamma-ray spectra were used during the reduction of C288300100030 the data. C288300100031 CORRECTION The total counts in the photopeak were corrected for C288300100032 decay and saturation. A correction was made for the C288300100033 abundance of the gamma ray for the decay scheme for C288300100034 each type of disintegration. The data were corrected C288300100035 for counting geometry and total absolute efficiency C288300100036 for the size of the NaI crystal, gamma-ray energies C288300100037 distance of the sample from the crystal, and sample C288300100038 size and thickness. C288300100039 HISTORY (20230112C) BP C288300100040 ENDBIB 38 0 C288300100041 NOCOMMON 0 0 C288300100042 ENDSUBENT 41 0 C288300199999 SUBENT C2883002 20230112 20240316 C288300200001 BIB 4 11 C288300200002 REACTION (73-TA-181(A,X)0-NN-1,,PY,,TT/CH) C288300200003 ERR-ANALYS (ERR-3) Uncertainty in neutron flux C288300200004 (ERR-1) Beam current error. C288300200005 (ERR-2) Angular resolution. C288300200006 (ERR-T) Total uncertainty C288300200007 CORRECTION Conversion from photopeak counts to neutron flux is C288300200008 considered to be +-15%. All variations affect the C288300200009 entire set of threshold detector data and do not C288300200010 change the shape of the curve. The beam current was C288300200011 known to +-3%, and detector angular location was +-1%. C288300200012 STATUS (TABLE) p.664, J,HP,11,659,1965 C288300200013 ENDBIB 11 0 C288300200014 COMMON 4 3 C288300200015 ERR-3 ERR-1 ERR-2 ERR-T C288300200016 PER-CENT PER-CENT PER-CENT PER-CENT C288300200017 15.0 3.0 1.0 25. C288300200018 ENDCOMMON 3 0 C288300200019 DATA 3 2 C288300200020 EN EN-ERR DATA C288300200021 MEV MEV PRD/MUCOUL C288300200022 40. 0.4 1.96E+10 C288300200023 80. 1.0 3.0E+11 C288300200024 ENDDATA 4 0 C288300200025 ENDSUBENT 24 0 C288300299999 ENDENTRY 2 0 C288399999999