ENTRY L0259 20200701 L044L025900000001 SUBENT L0259001 20200701 L044L025900100001 BIB 10 43 L025900100002 TITLE Compton scattering from 4He at the TUNL HIgS facility L025900100003 AUTHOR (X.Li,M.W.Ahmed,A.Banu,C.Bartram,B.Crowe,E.J.Downie, L025900100004 M.Emamian,G.Feldman,H.Gao,D.Godagama,H.W.Griesshammer, L025900100005 C.R.Howell,H.J.Karwowski,D.P.Kendellen,M.A.Kovash, L025900100006 K.K.H.Leung,D.Markoff,S.Mikhailov,R.E.Pywell, L025900100007 M.H.Sikora,J.A.Silano,R.S.Sosa,M.C.Spraker,G.Swift, L025900100008 P.Wallace,H.R.Weller,C.S.Whisnant,Y.K.Wu,Z.W.Zhao) L025900100009 INSTITUTE (1USADKE,1USATNL,1USANCC,1USANCA,1USAGWU,1USAKTY, L025900100010 1USANCS,1CANSAS,1USANGC) L025900100011 (1USAUSA)James Madison University,Harrisonburg,VirginiaL025900100012 REFERENCE (J,PR/C,101,034618,2020) L025900100013 FACILITY (ESTRG,1USATNL) Experiment performed at HIgS facility L025900100014 at the Triangle Universities Nuclear Laboratory L025900100015 SAMPLE Cryogenic liquid 4He target in form of cylinder with L025900100016 length of 20 cm and 4 cm in diameter. The cylindrical L025900100017 axis of the target cell was aligned along the beam L025900100018 axis.The liquid 4He was maintained at 3.4 K with a L025900100019 target thickness of (4.17+-0.04)E+23 nuclei/cm2. The L025900100020 walls and end windows of the cell were made from L025900100021 0.125-mm-thick Kapton foil. L025900100022 DETECTOR (NAICR) The Compton scattered photons were detected L025900100023 by an array of eight NaI(Tl) detectors with core L025900100024 diameter of 25.4 cm surrounded by eight annular L025900100025 segments of 7.5-cm-thick NaI(Tl) crystals. The L025900100026 lengths of the core NaI crystals ranged from 25.4 to L025900100027 30.5 cm. The annular segments were used as an L025900100028 anticoincidence shield to veto the cosmic-ray L025900100029 background. Detectors were placed at scattering L025900100030 angles of theta = 55deg, 90deg and 125deg in the L025900100031 laboratory frame. L025900100032 INC-SOURCE (LCS) The HIgS facility produces a quasimonoenergetic L025900100033 Compton backscattered photon beam tunable in wide L025900100034 energy range with either linear or circular L025900100035 polarization. The gamma-ray beam pulses have a width L025900100036 of about 300 ps FWHM and are separated by 179 ns. L025900100037 ERR-ANALYS (ERR-1,0.3,1.7) Systematic uncertainty in timing cut L025900100038 (ERR-2,0.4,1.9) Systematic uncertainty in line-shape L025900100039 fit window L025900100040 (ERR-3,0.3,1.3) Systematic uncertainty in energy cut atL025900100041 each angle (ROI) L025900100042 (ERR-4) Systematic uncertainty in incident flux L025900100043 (ERR-5) Systematic uncertainty in target thickness L025900100044 HISTORY (20200701C) Compiled by S.H. L025900100045 ENDBIB 43 0 L025900100046 COMMON 3 3 L025900100047 EN ERR-4 ERR-5 L025900100048 MEV PER-CENT PER-CENT L025900100049 81.3 2.0 1.0 L025900100050 ENDCOMMON 3 0 L025900100051 ENDSUBENT 50 0 L025900199999 SUBENT L0259002 20200701 L044L025900200001 BIB 3 5 L025900200002 REACTION (2-HE-4(G,EL)2-HE-4,,DA) L025900200003 ERR-ANALYS (ERR-S) Statistical uncertainty L025900200004 (ERR-6) Point-to-point systematic uncertainty L025900200005 (ERR-SYS) Overall systematic uncertainty L025900200006 STATUS (TABLE) Data taken from tab.3 of the reference L025900200007 ENDBIB 5 0 L025900200008 NOCOMMON 0 0 L025900200009 DATA 5 3 L025900200010 ANG DATA ERR-S ERR-6 ERR-SYS L025900200011 ADEG NB/SR NB/SR NB/SR NB/SR L025900200012 55. 78.0 1.9 1.7 2.4 L025900200013 90. 61.9 1.3 0.9 1.6 L025900200014 125. 97.0 1.5 1.2 2.5 L025900200015 ENDDATA 5 0 L025900200016 ENDSUBENT 15 0 L025900299999 ENDENTRY 2 0 L025999999999