ENTRY 30932 20090913 31413093200000001 SUBENT 30932001 20090913 31413093200100001 BIB 14 55 3093200100002 INSTITUTE (3DDRROS) 3093200100003 REFERENCE (J,JP/G,15,1025,1989) Full details on experim.+analysis3093200100004 (J,NIM/A,273,299,1988) Detailed information 3093200100005 about spectrometer, diff. cross section at 0 deg 3093200100006 AUTHOR (P.Michel,K.Moeller,J.Moesner,G.Schmidt) 3093200100007 TITLE Measurement of capture reaction H(n,d)g at 25.6 MeV 3093200100008 FACILITY (VDGT,3DDRROS) 3093200100009 INC-SOURCE (D-T) 9.5 MeV pulsed deuteron beam on Ti-T target 3093200100010 -the intensity of the colimated neutron beam was 3093200100011 4 x 10**5 n/sec at 2 micro-a deuteron current. 3093200100012 SAMPLE Gaseous hydrogen target at pressure of 0.4 mpA. 3093200100013 METHOD (TOF,COINC,EDE,OLMS) 3093200100014 -To reconstruct the angle between the neutron and 3093200100015 outgoing charged particle, in the telescope two 3093200100016 position-sensitive multistep chambers were installed. 3093200100017 -Deuterons together with other low-energy charged part.3093200100018 were separated from the elastically scattered protons 3093200100019 online and data were recorded event-by-event. 3093200100020 DETECTOR (TELES,SCIN,SCIN) 3093200100021 Two scintillation counters, which served for energy 3093200100022 determination (ede method) and particle separation(TOF)3093200100023 (MWPC) 2 multiwire proportional counters. 3093200100024 The first operated as veto detector and the second one 3093200100025 provided a coincidence signal which ensured that all 3093200100026 detected particles were produced within the gas cell. 3093200100027 The hydrogen gas target is used as counter gas. 3093200100028 * Two position-sensitive multistep chambers were used 3093200100029 for determination of the track coordinates in order to 3093200100030 reconstruct the neutron-deuteron angle. 3093200100031 PART-DET (D) 3093200100032 (P) Elastically scattered protons. 3093200100033 MONITOR (1-H-1(N,EL)1-H-1,,SIG) 3093200100034 MONIT-REF (,R.KINSEY,R,BNL-NCS-17541,1979) 3093200100035 CORRECTION Experimental data are corrected for 'background' of D. 3093200100036 The contributions to background deuterons are : 3093200100037 * * * * * Source * * * * * * * * * *% of the total 3093200100038 1)Due (n,d)reactions on C-12 and 0-16 * 3093200100039 the multiwire prop.counter * 1.2 % 3093200100040 2)Random coincidences from deuterons * 3093200100041 produced behind the hydrogen target * 4.0 % 3093200100042 3)True coincidences between last MWPC * 3093200100043 and the telescope. * 3093200100044 (The origin of this is not clear) * 6.3 % 3093200100045 4)Because of high efficiency of first * 3093200100046 MWPC a small fraction of d from the * 3093200100047 front of H-target are registered * 0.2 % 3093200100048 * 3093200100049 Total * 11.7 % 3093200100050 * * * * * * * * * * * * * * * * * * * * * * * * * * * 3093200100051 HISTORY (19890720C) VOF. 3093200100052 (19940711U) HW.-Alterations in Bib-section of sub. 003.3093200100053 (19970411A) HW.-Reaction code altered in sub. 003.- 3093200100054 (20090912A) SD:Updated to new date formats,lower case. 3093200100055 Cosmetic changes, codes for partial uncertainties and 3093200100056 data to DATA section were added in Subents 002-003. 3093200100057 ENDBIB 55 0 3093200100058 COMMON 2 3 3093200100059 EN EN-RSL-FW 3093200100060 MEV MEV 3093200100061 25.6 2.8 3093200100062 ENDCOMMON 3 0 3093200100063 ENDSUBENT 62 0 3093200199999 SUBENT 30932002 20090913 31413093200200001 BIB 5 16 3093200200002 REACTION (1-H-1(N,G)1-H-2,,SIG) 3093200200003 ANALYSIS Cross section was determined from ratio of the 3093200200004 number of measured deuterons to the number of 3093200200005 elastically scattered protons using a Monte Carlo 3093200200006 simulation. 3093200200007 ERR-ANALYS (ERR-T) Uncertainty includes: 3093200200008 (ERR-S) Statistical part : 1.5 % 3093200200009 (ERR-SYS) Systematic part : 2.6 % 3093200200010 a)Background corr.( 2 % ) 3093200200011 b)Uncertainty of n-p elast. cross section ( 1 % ) 3093200200012 COMMENT The measured total cross section for n-p capture 3093200200013 reaction (24.2+-0.7) micro-barn correspond to total 3093200200014 cross section (870.+-26) micro-barn for the 3093200200015 photo-disintegration of the deuteron at 15.0 MeV 3093200200016 gamma's energy in lab. system. 3093200200017 STATUS (TABLE) Data taken from J.of Phys.,G15,pag,1028,1988 3093200200018 ENDBIB 16 0 3093200200019 NOCOMMON 0 0 3093200200020 DATA 4 1 3093200200021 DATA ERR-T ERR-SYS ERR-S 3093200200022 MICRO-B MICRO-B PER-CENT PER-CENT 3093200200023 24.2 0.7 2.6 1.5 3093200200024 ENDDATA 3 0 3093200200025 ENDSUBENT 24 0 3093200299999 SUBENT 30932003 20090913 31413093200300001 BIB 6 20 3093200300002 REACTION (1-H-1(N,G)1-H-2,,DA,D,,DERIV) 3093200300003 ANALYSIS *The diff. cross section of deuterons produced was 3093200300004 determined by comparison of the experimental angular 3093200300005 distribution with the result of a Monte Carlo simula- 3093200300006 tion including energy and angular distribution of in- 3093200300007 coming neutrons, multiple scattering and energy loss 3093200300008 of deuterons, detector efficiencies and resolutions, 3093200300009 and geometrical effects.- 3093200300010 ERR-ANALYS (ERR-T) Uncertainty includes: 3093200300011 * The large error is mainly caused by counting 3093200300012 statistics. 3093200300013 (ERR-SYS) Systematic part : 0.9 micro-b/sr 3093200300014 COMMENT The measured data corresponds to the value of 3093200300015 5.8 +- 2.3 micro-barn/sr for the forward differential 3093200300016 cross section of the photo-disintegration reaction 3093200300017 under 15.03 MeV gammas. 3093200300018 STATUS (TABLE) Data taken from NIM/A,273,pag.,302,1988 3093200300019 HISTORY (19940711U) HW.- Free text under analysis and err- 3093200300020 analys altered.- 3093200300021 (19970411A) HW.- SF9 added to reaction code.- 3093200300022 ENDBIB 20 0 3093200300023 NOCOMMON 0 0 3093200300024 DATA 4 1 3093200300025 ANG DATA ERR-T ERR-SYS 3093200300026 ADEG B/SR B/SR MU-B/SR 3093200300027 0.0 162.0E-12 65.0E-12 0.9 3093200300028 ENDDATA 3 0 3093200300029 ENDSUBENT 28 0 3093200399999 ENDENTRY 3 0 3093299999999