ENTRY 30052 20080215 31253005200000001 SUBENT 30052001 20080215 31253005200100001 BIB 15 37 3005200100002 INSTITUTE (3NZLNZW) 3005200100003 REFERENCE (J,NP/A,94,617,1967) 3005200100004 AUTHOR (P.B.Johnson,N.G.Chapman,J.E.Callaghan) 3005200100005 TITLE The absolute cross sections of the 39K(n,p)39Ar and 3005200100006 39K(n,a)36Cl reactions for 2.46 MeV neutrons. 3005200100007 FACILITY (VDG) Van de Graaff accelerator 3005200100008 INC-SOURCE (D-D) D(d,n)He3 reaction. Built-in deuterium tar- 3005200100009 get obtained by bombarding a water cooled gold target 3005200100010 SAMPLE Single crystal in the form of KI(Tl) 3005200100011 number of 39K atoms/sqcm=1.175x10**22 3005200100012 METHOD (COINC) Coincidence between scintillations from 3005200100013 neutron-bombarded ki(Tl) crystal with pulses from a He33005200100014 detector 3005200100015 DETECTOR (SCIN) KI(Tl) crystal 17 cm in diameter and 0.12 cm3005200100016 deep which acted also as sample 3005200100017 (SIBAR) silicon surface barrier detector of resistivity3005200100018 5300 ohms x cm and alpha energy resolution of 20 keV 3005200100019 ANALYSIS Cross sections derived from the spectrum of pulses from3005200100020 the scintillation detector. 3005200100021 COMMENT The energy resolution given in common means total 3005200100022 spread in energy of neutrons in the tagged neutron beam3005200100023 the neutron energy spread(FWHM) was estimated=+-25 keV3005200100024 STATUS (TABLE) Data from Nucl.Phys. A 94,617,1967 3005200100025 Private communication from B.P.Johnson 13May19683005200100026 HISTORY (19680518R) Data received from B.P.Johnson 3005200100027 (19681218C) Data compiled into Dastar 3005200100028 (19701215T) Previously Dastar-00620 3005200100029 (20080305A) BIB section updated 3005200100030 CORRECTION Correction made to allow for attenuation and inelastic 3005200100031 scattering of the tagged neutron beam =+2.7%, 3005200100032 correction of -1.5% made to allow for increase 3005200100033 in neutron path length resulting from elastic scatter. 3005200100034 within the crystal and angular divergence of the tagged3005200100035 neutron beam. Other corrections considered negligible. 3005200100036 ERR-ANALYS (DATA-ERR) Quoted error includes a counting error of 3005200100037 +-1 standard deviation together with estimate of 3005200100038 possible error in assessing area under peak 3005200100039 ENDBIB 37 0 3005200100040 COMMON 2 3 3005200100041 EN EN-RSL 3005200100042 MEV MEV 3005200100043 2.4600E+00 4.0000E-02 3005200100044 ENDCOMMON 3 0 3005200100045 ENDSUBENT 44 0 3005200199999 SUBENT 30052002 20080215 31253005200200001 BIB 2 2 3005200200002 REACTION (19-K-39(N,P)18-AR-39,,SIG) 3005200200003 PART-DET (P) Protons. Proton energy=2.54+-0.05 MeV 3005200200004 ENDBIB 2 0 3005200200005 NOCOMMON 0 0 3005200200006 DATA 2 1 3005200200007 DATA DATA-ERR 3005200200008 MB MB 3005200200009 9.5000E+01 4.0000E+00 3005200200010 ENDDATA 3 0 3005200200011 ENDSUBENT 10 0 3005200299999 SUBENT 30052003 20080215 31253005200300001 BIB 3 7 3005200300002 REACTION (19-K-39(N,A)17-CL-36,,SIG) 3005200300003 PART-DET (A) Alpha particles. Alpha energy= 3.4+-0.1 MeV3005200300004 COMMENT Area under alpha peak estimated by fitting experimental3005200300005 data with a curve based on the known spectrum shape of 3005200300006 the scintillation detector for alpha particles having 3005200300007 energy of 3.4 MeV in order to correct for tail of 3005200300008 proton peak 3005200300009 ENDBIB 7 0 3005200300010 NOCOMMON 0 0 3005200300011 DATA 2 1 3005200300012 DATA DATA-ERR 3005200300013 MB MB 3005200300014 6.2000E+00 1.0000E+00 3005200300015 ENDDATA 3 0 3005200300016 ENDSUBENT 15 0 3005200399999 ENDENTRY 3 0 3005299999999