ENTRY M0944 20171116 M092M094400000001 SUBENT M0944001 20171116 M092M094400100001 BIB 13 44 M094400100002 TITLE Study of three-nucleon mechanisms in the M094400100003 photodisintegration of 3He. M094400100004 AUTHOR (G.Audit,A.Braghieri,N.D'hose,V.Isbert,S.Kerhoas, M094400100005 J.M.Laget,M.Mac Cormick,L.Y.Murphy,A.Panzeri, M094400100006 P.Pedroni,T.Pinelli,G.Tamas,J.Ahrens,J.R.M.Annand, M094400100007 R.Crawford,P.Grabmayr,S.J.Hall,J.D.Kellie) M094400100008 INSTITUTE (2FR SAC,2ITYPAV,2GERMNZ,2UK GLS,2GERTUE) M094400100009 REFERENCE (J,NP/A,614,461,1997) M094400100010 #doi:10.1016/S0375-9474(96)00441-1 M094400100011 INC-SOURCE (QMPH,TAGD) Tagged photon facility installed by M094400100012 Glasgow University at the race-track microtron MAMI M094400100013 at Mainz (855 MeV electrons). M094400100014 FACILITY (MICRT,2GERMNZ) MAMI Mainz race-track microtron. M094400100015 DETECTOR (SCIN,MWPC,TELES) The large acceptance (3.7 PI sr) M094400100016 detector DAPHNE, built by DAPNIA-SphN at Saclay and M094400100017 the INFN-Sezione di Pavia. The DAPHNE device has a M094400100018 central tracking detector, consisting of three M094400100019 coaxial cylindrical multiwire proportional chambers, M094400100020 surrounded by a segmented cylindrical scintillator M094400100021 dE-E telescope for charged particle identification. M094400100022 SAMPLE The liquid 3He target, maintained at 2.65 K and 556 M094400100023 mbar, is contained in a Mylar cylinder of dimensions M094400100024 4.3 cm in diameter by 27.5 cm in length. M094400100025 METHOD (EXTB,SITA) M094400100026 ANALYSIS Since the photon energy and the momenta and M094400100027 directions of two detected protons are known M094400100028 precisely, the ppn kinematics is overdetermined and M094400100029 a kinematic fit can be performed in order to M094400100030 eliminate all competing reactions in which pions are M094400100031 produced. M094400100032 ERR-ANALYS No information. M094400100033 But information on systematic errors is presented: M094400100034 (ERR-1) Number of photons - 2.0%, M094400100035 (ERR-2) Target thickness - 0.5%, M094400100036 (ERR-3) Wire chamber efficiency - 1.0%, M094400100037 (ERR-4,1.,5.) Proton identification method - 1-5%. M094400100038 COMMENT The total photoabsorption cross sections for He-4 has M094400100039 been measured for the first time over a wide photon M094400100040 energy range from 200 to 800 MeV. By using the large M094400100041 acceptance detector DAPHNE at the tagged photon M094400100042 facility of MAMI accelerator in Mainz high precision M094400100043 results with small systematic errors were obtained. M094400100044 HISTORY (20171116C) Data were compiled at the MSU SINP CDFE M094400100045 by V.Varlamov. M094400100046 ENDBIB 44 0 M094400100047 COMMON 4 3 M094400100048 EN-RSL ERR-1 ERR-2 ERR-3 M094400100049 MEV PER-CENT PER-CENT PER-CENT M094400100050 2.0 2.0 0.5 1.0 M094400100051 ENDCOMMON 3 0 M094400100052 ENDSUBENT 51 0 M094400199999 SUBENT M0944002 20171116 M092M094400200001 BIB 2 3 M094400200002 REACTION (2-HE-3(G,N+P)1-H-1,,SIG) M094400200003 3N photoabsorption cross section. M094400200004 STATUS (CURVE) Data from Fig. 5. M094400200005 ENDBIB 3 0 M094400200006 NOCOMMON 0 0 M094400200007 DATA 2 57 M094400200008 EN DATA M094400200009 MEV MICRO-B M094400200010 204. 25.42 M094400200011 216. 27.84 M094400200012 228. 29.91 M094400200013 240.3 32.52 M094400200014 252.3 35.33 M094400200015 264. 37.38 M094400200016 276.2 38.50 M094400200017 288.5 39.31 M094400200018 300. 39.25 M094400200019 312.7 37.76 M094400200020 324.6 35.73 M094400200021 336.8 33.27 M094400200022 348. 30.28 M094400200023 360.1 28.22 M094400200024 371.2 25.23 M094400200025 383.2 22.99 M094400200026 395.8 20.75 M094400200027 408.4 18.88 M094400200028 419.5 17.75 M094400200029 431. 16.07 M094400200030 441.6 14.58 M094400200031 452.7 13.46 M094400200032 465.5 12.34 M094400200033 476.1 10.84 M094400200034 487.9 10.47 M094400200035 499.9 9.54 M094400200036 510.7 8.97 M094400200037 522. 8.41 M094400200038 533.8 7.66 M094400200039 542.6 7.10 M094400200040 554.4 6.73 M094400200041 564.3 6.57 M094400200042 574.5 5.98 M094400200043 584.8 5.59 M094400200044 594.6 5.23 M094400200045 604.8 5.01 M094400200046 614.9 4.64 M094400200047 625. 4.34 M094400200048 634.9 4.30 M094400200049 639.9 4.15 M094400200050 655. 3.73 M094400200051 663.1 3.36 M094400200052 673. 3.32 M094400200053 682.9 3.17 M094400200054 691.1 3.02 M094400200055 699. 2.79 M094400200056 707.1 2.77 M094400200057 716. 2.24 M094400200058 725. 2.64 M094400200059 732.3 2.43 M094400200060 739.4 2.42 M094400200061 747.7 2.40 M094400200062 755.8 2.04 M094400200063 766. 1.97 M094400200064 774. 1.87 M094400200065 781.9 1.86 M094400200066 790.2 1.85 M094400200067 ENDDATA 59 0 M094400200068 ENDSUBENT 67 0 M094400299999 ENDENTRY 2 0 M094499999999