ENTRY L0184 20130711 L022L018400000001 SUBENT L0184001 20130711 L022L018400100001 BIB 12 33 L018400100002 TITLE Photo-production of Negative Pions on 15N Using L018400100003 Egamma = 184 MeV Tagged Photons L018400100004 AUTHOR (H.T.Chung,J.C.Kim,J.Shaw,T.Kobayashi,H.Choi,P.Stoler, L018400100005 H.B.Van Den Brink,H.P.Block,W.H.A.Hesselink,T.Gresko, L018400100006 K.Keeter, J.H.Mitchell,B.Norum,E.L.Hallin,D.M.Skopik, L018400100007 J.M.Vogt, T.P.Welch) L018400100008 REFERENCE (J,KPS,29,(5),581,1996) L018400100009 INSTITUTE (3KORNSU,1USARPI,2NEDFUL,1USAVIR,1CANSAS,1USAORU) L018400100010 FACILITY (LINAC,1CANSAS) L018400100011 SAMPLE (7-N-15,ENR=0.998) A urea-form aldehyde (NH3CONH2) L018400100012 and 300 +- 2 mg/cm2 commercial CH2 targets were used L018400100013 in the experiment. L018400100014 DETECTOR (MWPC,CEREN,SCIN) Each of two telescopes consisted of L018400100015 two multi-wire proportional chambers, one Cherenkov L018400100016 detector, and 16 NE 102 plastic scintillators. L018400100017 PART-DET (PI,E,P) L018400100018 INC-SOURCE (BRST,TAGD) L018400100019 METHOD (EXTB,COINC) A tagged photon beam was obtained L018400100020 from an electron beam of energy 268 MeV. Only the L018400100021 photons coming with the proper secondary electrons in L018400100022 specified coincidence resolving time are tagged L018400100023 photons. Pions were produced by properly tagged L018400100024 photons. Particle identification was based on the L018400100025 comparison experimental energy loss with the Birk's L018400100026 formula calculations. L018400100027 ANALYSIS The differential cross section of a (gamma,pi) L018400100028 reaction in the lab system is dsigma/domega = L018400100029 Npi/(Ngamma*(Nt/cos (thetat))*DOmega), where Npi is L018400100030 the number of pions, Ngamma is the number of incident L018400100031 photons, Nt is the number of target nuclei, thetat=45 L018400100032 degrees is the angle of the target to the beamline, L018400100033 and DOmega is the detector solid angle. L018400100034 HISTORY (20130711C) BP L018400100035 ENDBIB 33 0 L018400100036 COMMON 1 3 L018400100037 EN-RSL L018400100038 PER-CENT L018400100039 0.01 L018400100040 ENDCOMMON 3 0 L018400100041 ENDSUBENT 40 0 L018400199999 SUBENT L0184002 20130711 L022L018400200001 BIB 4 6 L018400200002 REACTION 1(1-H-1(G,PIP)0-NN-1,,DA) L018400200003 2(1-H-1(G,PIP)0-NN-1,,DA) L018400200004 METHOD 1Telescope 1. L018400200005 2Telescope 2. L018400200006 STATUS (CURVE) Fig.6, page 584. L018400200007 ERR-ANALYS (DATA-ERR) No details are given. L018400200008 ENDBIB 6 0 L018400200009 COMMON 1 3 L018400200010 ANG-CM L018400200011 ADEG L018400200012 57.0 L018400200013 ENDCOMMON 3 0 L018400200014 DATA 6 2 L018400200015 EN EN-ERR DATA-CM 1DATA-ERR 1DATA-CM 2DATA-ERR 2L018400200016 MEV MEV MB/SR MB/SR MB/SR MB/SR L018400200017 193.0 5.0 7.008E-03 6.05E-04 L018400200018 192.0 5.0 6.782E-03 4.46E-04L018400200019 ENDDATA 4 0 L018400200020 ENDSUBENT 19 0 L018400299999 SUBENT L0184003 20130711 L022L018400300001 BIB 4 6 L018400300002 REACTION (7-N-15(G,PIN)8-O-15,PAR,DA) L018400300003 STATUS (CURVE) Fig.8, page 585. L018400300004 METHOD Two telescopes were located at 45 and 80 degrees and L018400300005 later shifted to 60 and 100 degrees in the lab system. L018400300006 ERR-ANALYS (DATA-ERR) The error bars of the experimental data L018400300007 include statistical and systematic errors. L018400300008 ENDBIB 6 0 L018400300009 COMMON 1 3 L018400300010 E-LVL L018400300011 MEV L018400300012 0.0 L018400300013 ENDCOMMON 3 0 L018400300014 DATA 5 4 L018400300015 ANG-CM EN EN-ERR DATA-CM DATA-ERR L018400300016 ADEG MEV MEV MB/SR MB/SR L018400300017 45.976 184.5 4.5 1.18E-03 5.94E-04 L018400300018 60.756 184.0 5.0 3.73E-04 3.28E-04 L018400300019 81.013 184.5 4.5 5.19E-04 2.73E-04 L018400300020 100.882 186.0 4.0 4.37E-04 3.28E-04 L018400300021 ENDDATA 6 0 L018400300022 ENDSUBENT 21 0 L018400399999 ENDENTRY 3 0 L018499999999