ENTRY O1380 20060419 O026O138000000001 SUBENT O1380001 20060419 O026O138000100001 BIB 13 45 O138000100002 REFERENCE (J,NIM/A,404,394,1998) O138000100003 TITLE He-4(d,d) scattering as polarization standard O138000100004 AUTHOR (H.Anklin, J.Jourdan, L.M.Qin, I.Sick, P.Trueb, O138000100005 D.Vetterli, B.Zihirmann, P.A.Schmelzbach) O138000100006 INSTITUTE (2SWTBAS) Deptartment fuer Physik und Astronomic. O138000100007 SAMPLE A gaseous 4-He target was placed in the center of the O138000100008 scattering chamber. The cylindrical target had a O138000100009 diameter of 5 cm, and contained helium of atmospheric O138000100010 pressure. Entrance and exit windows, made from 5.8 O138000100011 mg/cm2 Havar foil, were outside the acceptance O138000100012 defined by the slit system that proceeded the O138000100013 detectors. O138000100014 INC-SOURCE (POLIS) The polarization of the beam was flipped once aO138000100015 second through 3 different polarization states: the O138000100016 unpolarized state (0), and two tensor- and vector- O138000100017 polarized states (1,2), the polarization of which was O138000100018 equal in magnitude, but opposite in sign. O138000100019 The left-right asymmetry of d-12-C elastic scattering O138000100020 was continuously measured using a 200 mug/cm2 carbon O138000100021 target and NaI detectors placed at + and - 50 degrees O138000100022 scattering angles. O138000100023 DETECTOR (SIBAR) The deuterons and alpha-particles were detectedO138000100024 using stacks of totally depleted Si surface barrier O138000100025 detectors, with thicknesses ranging from 40 nm to 1 mm.O138000100026 (NAICR) Two the detectors were used in polarimeter to mO138000100027 measure scattered deutrons. O138000100028 FACILITY (CYCLO,2SWTBAS) O138000100029 METHOD (EDEG) The thickness of the degraders was known to O138000100030 <1%. The effective energy loss of the deuterons was O138000100031 measured via the energy of the reaction products from O138000100032 d-He-4 scattering. O138000100033 (EDE) By measuring both energy loss in the thin O138000100034 detectors, and the total energy, particles could be O138000100035 cleanly identified, without background. O138000100036 (BCINT) Faraday cup O138000100037 CORRECTION For dead time of the different spin states. The O138000100038 dead-time corrections never exceeded 2%. O138000100039 HISTORY (20060414C) By F.Ch O138000100040 (20060419U) Last checking has been done. O138000100041 STATUS (APRVD) By J.Jourdan 18-04-2006 O138000100042 ERR-ANALYS (ANG-ERR) An angular acceptance. O138000100043 (ERR-S) Statistical uncertainty. O138000100044 (ERR-1) The normalization of the data to the ones of O138000100045 W.Gruebler+' results would add a systematic error of O138000100046 +/- 2.1%. O138000100047 ENDBIB 45 0 O138000100048 COMMON 2 3 O138000100049 ANG-ERR ERR-1 O138000100050 ADEG PER-CENT O138000100051 0.4 2.1 O138000100052 ENDCOMMON 3 0 O138000100053 ENDSUBENT 52 0 O138000199999 SUBENT O1380002 20060419 O026O138000200001 BIB 4 7 O138000200002 REACTION (2-HE-4(D,EL)2-HE-4,NN,POL/DA,,ANA) O138000200003 PART-DET (D) O138000200004 (A) O138000200005 REL-REF (R,,W.GRUEBLER+,J,NP/A,334,365,1980) The value for O138000200006 tensor polarization (AYY) at 27.3 MeV has been used toO138000200007 normalize authors' data. O138000200008 COMMENT -By compiler. "ANG-CM" Is scattering angle of deuteronsO138000200009 ENDBIB 7 0 O138000200010 COMMON 1 3 O138000200011 ANG-CM O138000200012 ADEG O138000200013 150. O138000200014 ENDCOMMON 3 0 O138000200015 DATA 3 5 O138000200016 EN DATA ERR-S O138000200017 MEV NO-DIM NO-DIM O138000200018 32.7 0.989 0.01 O138000200019 35.7 1.001 0.008 O138000200020 40.1 0.974 0.01 O138000200021 46.3 0.931 0.013 O138000200022 52.1 0.903 0.013 O138000200023 ENDDATA 7 0 O138000200024 ENDSUBENT 23 0 O138000299999 ENDENTRY 2 0 O138099999999