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