ENTRY M1018 20201101 M109M101800000001 SUBENT M1018001 20201101 M109M101800100001 BIB 14 64 M101800100002 TITLE Measurement of the tensor analyzing power T20 of the M101800100003 reaction gamma d -> dpi0. M101800100004 AUTHOR (V.V.Gauzshtein,M.I.Levchuk,A.Yu.Loginov, M101800100005 D.M.Nikolenko,I.A.Rachek,R.Sh.Sadykov,Yu.V.Shestakov, M101800100006 D.K.Toporkov,V.A.Tryasuchev,B.I.Vasilishin, M101800100007 S.A.Zevakov,A.V.Bogomyagkov,A.N.Zhuravlev, M101800100008 S.E.Karnaev,V.A.Kiselev,E.B.Levichev,O.I.Meshkov, M101800100009 S.I.Mishnev,I.N.Okunev,P.A.Pimenov,E.A.Simonov, M101800100010 S.V.Sinyatkin,E.V.Starostina) M101800100011 REFERENCE (J,IMP/E,29,2050011,2020) M101800100012 #doi:10.1142/S0218301320500111 M101800100013 INSTITUTE (4RUSTPI,4BLRIFB,4RUSSIB) M101800100014 Tomsk State University of Control Systems and M101800100015 Radioelectronics, Russia. M101800100016 Novosibirsk State University, Russia. M101800100017 FACILITY (ESTRG,4RUSSIB) Electron storage ring VEPP-3 of M101800100018 Budker Institute of Nuclear Physics. M101800100019 SAMPLE Internal tensor polarized deuterium target. The jet M101800100020 of tensor polarized deuterons from the polarized M101800100021 atomic source was held in the storage cell installed M101800100022 in the vacuum chamber of storage ring. The vector M101800100023 polarization of the jet was maintained close to zero M101800100024 (Pz < 0.02), whereas the tensor polarisation of the M101800100025 jet's atoms was close to the extreme values (Pz M101800100026 equal near +1 or -2). The sign of tensor polarization M101800100027 of the deuterium target was changed every 30 sec M101800100028 during the acquisition of the data. M101800100029 REL-REF (M,,M.V.Dyug+,J,NIM/A,495,8,2002) M101800100030 A detailed description of the polarized atomic source M101800100031 and the storage cell. M101800100032 INC-SOURCE (POLTR,BRST,KINDT) M101800100033 PART-DET (G,D) M101800100034 METHOD (COINC) The deuterons were detected by the upper M101800100035 arm of the detecting system, whereas the g-quanta M101800100036 from the PI0 meson decay were detected by the M101800100037 lower arm of the system. M101800100038 DETECTOR (MWPC,SCIN) The upper (deuteron) arm of the detecting M101800100039 system consists of drift chambers and three M101800100040 layers of plastic scintillators having thickness of M101800100041 2, 12, and 20 cm, respectively. M101800100042 (SCIN) The lower (g-quanta) arm of the detecting M101800100043 system consists of a calorimeter that consisted of M101800100044 NaI and CsI scintillators. The size of the CsI M101800100045 crystals was 60x60x150 mm, whereas the size of NaI M101800100046 crystals was 55x115x300 mm. M101800100047 ERR-ANALYS (ERR-T) Total measurement error is given for each M101800100048 experimental point and takes into account the M101800100049 statistical and systematic uncertainties. M101800100050 (ERR-1) The systematic uncertainty takes into account M101800100051 the measurement uncertainty of the target tensor M101800100052 polarization (3.5%). M101800100053 (ERR-2,5.,7.) During the identification of the channel M101800100054 for the gd -> dpi0 reaction, it was impossible to M101800100055 remove the background, which was estimated to range M101800100056 from 5% to 7% depending on the photon energy. M101800100057 (ERR-3,,5.) The error induced by the neglect of the M101800100058 contribution of longitudinal virtual photons to the M101800100059 reaction amplitude at small electron scattering M101800100060 angles, does not exceed 5%. M101800100061 COMMENT The events of the reaction gd ->dpi0 were extracted M101800100062 from the experimental data collected at VEPP-3 M101800100063 storage ring in 2013. M101800100064 HISTORY (20201101C) Data were compiled at Russia MSU SINP M101800100065 CDFE by V.Varlamov. M101800100066 ENDBIB 64 0 M101800100067 COMMON 1 3 M101800100068 ERR-1 M101800100069 PER-CENT M101800100070 3.5 M101800100071 ENDCOMMON 3 0 M101800100072 ENDSUBENT 71 0 M101800199999 SUBENT M1018002 20201101 M109M101800200001 BIB 2 2 M101800200002 REACTION (1-H-2(G,PI0)1-H-2,20,POL/DA,,TAP) M101800200003 STATUS (CURVE) Data from Fig. 4 (left). M101800200004 ENDBIB 2 0 M101800200005 COMMON 1 3 M101800200006 EN M101800200007 MEV M101800200008 260. M101800200009 ENDCOMMON 3 0 M101800200010 DATA 4 5 M101800200011 ANG-CM-MIN ANG-CM-MAX DATA ERR-T M101800200012 ADEG ADEG NO-DIM NO-DIM M101800200013 95. 105. -0.944 0.041 M101800200014 105. 115. -0.168 0.025 M101800200015 115. 125. -0.200 0.026 M101800200016 125. 135. -0.318 0.032 M101800200017 135. 145. -0.330 0.050 M101800200018 ENDDATA 7 0 M101800200019 ENDSUBENT 18 0 M101800299999 SUBENT M1018003 20201101 M109M101800300001 BIB 2 2 M101800300002 REACTION (1-H-2(G,PI0)1-H-2,20,POL/DA,,TAP) M101800300003 STATUS (CURVE) Data from Fig. 4 (central). M101800300004 ENDBIB 2 0 M101800300005 COMMON 1 3 M101800300006 EN M101800300007 MEV M101800300008 340. M101800300009 ENDCOMMON 3 0 M101800300010 DATA 4 4 M101800300011 ANG-CM-MIN ANG-CM-MAX DATA ERR-T M101800300012 ADEG ADEG NO-DIM NO-DIM M101800300013 100. 110. -0.190 0.066 M101800300014 110. 120. -0.500 0.057 M101800300015 120. 130. -0.672 0.072 M101800300016 130. 140. -0.661 0.089 M101800300017 ENDDATA 6 0 M101800300018 ENDSUBENT 17 0 M101800399999 SUBENT M1018004 20201101 M109M101800400001 BIB 2 2 M101800400002 REACTION (1-H-2(G,PI0)1-H-2,20,POL/DA,,TAP) M101800400003 STATUS (CURVE) Data from Fig. 4 (right). M101800400004 ENDBIB 2 0 M101800400005 COMMON 1 3 M101800400006 EN M101800400007 MEV M101800400008 400. M101800400009 ENDCOMMON 3 0 M101800400010 DATA 4 4 M101800400011 ANG-CM-MIN ANG-CM-MAX DATA ERR-T M101800400012 ADEG ADEG NO-DIM NO-DIM M101800400013 95. 105. -0.402 0.123 M101800400014 105. 115. -0.532 0.074 M101800400015 115. 125. -0.528 0.078 M101800400016 125. 135. -0.603 0.114 M101800400017 ENDDATA 6 0 M101800400018 ENDSUBENT 17 0 M101800499999 ENDENTRY 4 0 M101899999999