ENTRY K2299 20130906 K013K229900000001 SUBENT K2299001 20130906 K013K229900100001 BIB 14 40 K229900100002 TITLE Photoproduction of two neutral pions from hydrogen K229900100003 near threshold K229900100004 AUTHOR (T.Kitagaki, Y.Ohnuki, S.Tanaka, S.Homma, K.Abe) K229900100005 INSTITUTE (2JPNTOH) Department of Physics K229900100006 REFERENCE (J,JPJ,30,(3),595,1971) K229900100007 PART-DET (G) K229900100008 EN-SEC - ANG1 is polar angle (lab.) between beam and prompt K229900100009 gamma 1 K229900100010 - ANG2 is polar angle (lab.) between beam and prompt K229900100011 gamma 2 K229900100012 INC-SOURCE Beam intensity is 2.0E+08 PPS. K229900100013 (BRST) 50 micro meter platinum target was used for K229900100014 producing the photon beam K229900100015 SAMPLE - Chemical-form of target is unknown. K229900100016 - Physical-form of target is liquid. K229900100017 - Target-thickness: Liquid hydrogen target container - K229900100018 cylinder with diameter 6 cm and length 10 cm, K229900100019 container material is 5-mil Mylar K229900100020 METHOD (COINC) Detect prompt gamma and prompt gamma in K229900100021 coincidence. K229900100022 FACILITY (SYNCH,2JPNTOK) 750 MeV electron synchrotron at K229900100023 Institute for Nuclear Study (INS) K229900100024 ANALYSIS (PHDIF) K229900100025 DETECTOR - Solid angle of detector is 0.09 sr. K229900100026 - Detector resolution: approximately 30% at 600 MeV K229900100027 and is about 50% at 200 MeV K229900100028 - Calibration: The calibration curve (Fig.3) is K229900100029 responded the nearly proportional to the energy of K229900100030 the incident electron over the energy range from 60 K229900100031 to 600 MeV. K229900100032 - Efficiency: less than 4% at 100 MeV and greater than K229900100033 97% at 400 MeV. K229900100034 (SCIN) Two lead-scintillator sandwich type shower K229900100035 counter. Each counter consists of seventeen K229900100036 10-mm-thick sheets of plastic scintillator and K229900100037 sixteen 3-mm sheets of lead alternately K229900100038 arranged. K229900100039 STATUS (TABLE) Presented in Table 1 of J.Phys.Soc.Jpn K229900100040 30(1971)595 K229900100041 HISTORY (20120604C) D.Ichinkhorloo & A.Makinaga K229900100042 ENDBIB 40 0 K229900100043 COMMON 2 3 K229900100044 ANG1 ANG2 K229900100045 ADEG ADEG K229900100046 55. 55. K229900100047 ENDCOMMON 3 0 K229900100048 ENDSUBENT 47 0 K229900199999 SUBENT K2299002 20130906 K013K229900200001 BIB 3 4 K229900200002 REACTION (1-H-1(G,2PI0)1-H-1,,DA/DA,PI0/PI0,BRS) K229900200003 ERR-ANALYS (ERR-S) Statistical uncertainty K229900200004 FLAG (1.) energy bias setting is 185 MeV K229900200005 (2.) energy bias setting is 200 MeV K229900200006 ENDBIB 4 0 K229900200007 NOCOMMON 0 0 K229900200008 DATA 5 5 K229900200009 EN-MIN EN-MAX DATA ERR-S FLAG K229900200010 MEV MEV MB/SR2 MB/SR2 NO-DIM K229900200011 500. 600. 0.05 0.12 1. K229900200012 600. 650. 0.10 0.15 1. K229900200013 600. 650. -0.02 0.13 2. K229900200014 650. 730. 0.33 0.15 1. K229900200015 650. 730. 0.20 0.12 2. K229900200016 ENDDATA 7 0 K229900200017 ENDSUBENT 16 0 K229900299999 ENDENTRY 2 0 K229999999999