ENTRY M0666 20100122 M052M066600000001 SUBENT M0666001 20100122 M052M066600100001 BIB 15 71 M066600100002 TITLE Two-body disintegration of the deuteron with 0.8 - M066600100003 1.8 GeV photons. M066600100004 AUTHOR (S.J.Freedman,D.G.Geesaman,R.Gilman,M.C.Green, M066600100005 R.J.Holt,H.E.Jackson,E.R.Kinney,R.Kowalczyk, M066600100006 C.Marchand,J.Napolitano,J.Nelson,D.H.Potterveld, M066600100007 B.Zeidman,R.E.Segel,T.-Y.Tung,D.Beck,G.Boyd, M066600100008 D.Collins,B.W.Filippone,C.E.Jones,J.Jourdan, M066600100009 R.D.Mckeown,R.Milner,R.Walker,P.E.Bosted, M066600100010 Z.-E.Meziani,R.Minehart) M066600100011 REFERENCE (J,PR/C,48,1864,1993) M066600100012 INSTITUTE (1USAANL,1USANWU,1USACAL,1USAAMW,1USASTF,1USAVIR) M066600100013 FACILITY (LINAC,1USAANL) Stanford Linear Accelerator Center M066600100014 (SLAC). M066600100015 INC-SOURCE (BRST) The photon beam was generated via M066600100016 bremsstrahlung of the electron beam in thin Cu M066600100017 radiator 1m upstream of the deuterium target. M066600100018 DETECTOR (MAGSP) Particles from target were momentum analyzed M066600100019 and identified using the SLAC 1.6 GeV/c spectrometer M066600100020 instrumented with a new detector package of M066600100021 scintillator hodoscopes in combination with drift M066600100022 chambers plus a threshold Cerenkov detector. M066600100023 PART-DET (P) M066600100024 METHOD (MAGFR) M066600100025 SAMPLE Two sets of targets. The criogenic targets consisted M066600100026 of three pairs of 5 cm diameter flasks, each pair M066600100027 comprising nominal 4 cm and 15 cm long flasks filled M066600100028 with liquid deuterium, liquid hydrogen, and vacuum, M066600100029 respectively. Seven additional targets - all thin M066600100030 0.33 g/cm**2 carbon slabs. M066600100031 ANALYSIS The cross section at each photon energy and angle was M066600100032 extracted from four separate measurements: (1) Cu M066600100033 radiator and liquid deuterium (LD2) target in the M066600100034 beam (Nrd); (2) Cu radiator and liquid hydrogen M066600100035 (LH2) target in the beam (Nrh); (3) LD2 target in M066600100036 the beam and no radiator (Nod); and (4) LH2 target M066600100037 in the beam and no radiator. The yield from deuteron M066600100038 photodesintegration was obtained from the following M066600100039 expression: Nd = (Nrd - Nrh) - (Nod - Noh). M066600100040 The measured photofission yield was converted into M066600100041 absolute photofission cross section by summing the M066600100042 contributions to fission events due to all photons M066600100043 of energy between the photofission threshold and M066600100044 end-point energy in energy spectrum of the incident M066600100045 photons. M066600100046 ERR-ANALYS (ERR-S) Statistical errors. M066600100047 COMMENT The differential cross sections for the reaction M066600100048 2H(g,p)n has been measured at several center-of-mass M066600100049 angles ranging from 50 to 143 degree for photon M066600100050 energies between 0.8 and 1.8 GeV. The experiment was M066600100051 performed at the SLAC-NPAS facility with the use of M066600100052 the 1.6 GeV/c spectrometer to detect the high energy M066600100053 protons produced by a bremsstrahlung beam directed M066600100054 at a liquid deuterium target. Contributions from M066600100055 concurrent disintegration by the residual electron M066600100056 beam were determined by measuring the proton yield M066600100057 without the Cu photon radiator. At angles not very M066600100058 far from 90 degree, the energy dependence of the M066600100059 cross sections is consistent with predictions of M066600100060 scaling using counting rules for constituent M066600100061 quarks. At least one theoretical calculation based M066600100062 on a meson-baryon picture of the reaction is able to M066600100063 reproduce the magnitude and energy dependence of the M066600100064 90 degree cross section. The angular distribution M066600100065 exhibits a large enhancement at backward angles at M066600100066 the higher energies. M066600100067 STATUS (TABLE) The data were published in digital form. M066600100068 HISTORY (20050218C) M066600100069 (20050901A) Corrected by V.Varlamov: BRA substituted M066600100070 by BRS in line REACTION of SUBENT 002. M066600100071 (20100122A) Entry deleted because duplication with M066600100072 M0553. M066600100073 ENDBIB 71 0 M066600100074 NOCOMMON 0 0 M066600100075 ENDSUBENT 74 0 M066600199999 NOSUBENT M0666002 20100122 M052M066600200001 ENDENTRY 2 0 M066699999999