ENTRY 20757 20140824 22402075700000001 SUBENT 20757001 20140824 22402075700100001 BIB 15 53 2075700100002 INSTITUTE (2FR ILL) 2075700100003 REFERENCE (J,PL/B,71,(2),321,1977) Data are given. 2075700100004 (W,RAUCH,19780201) Abstract about this work. 2075700100005 REL-REF (I,20762001,W.Bauspiess+,C,76LOWELL,,1027,1976) 2075700100006 Apparat.details. 2075700100007 (I,,W.Bauspiess+,J,ZP,271,177,1974) Apparatus details. 2075700100008 (I,,H.Rauch+,J,PL/A,47,(5),369,1974) Experim. method 2075700100009 details given. 2075700100010 (M,21622001,H.Kaiser+,J,ZP/A,291,231,1979) The details 2075700100011 of the measurements and of the fit procedure described 2075700100012 AUTHOR (H.Kaiser,H.Rauch,W.Bauspiess,U.Bonse) 2075700100013 TITLE -Measurement of the coherent neutron scattering length 2075700100014 of He-3 by neutron interferometry- 2075700100015 FACILITY (REAC,2FR ILL).Experiments were carried out at a radial2075700100016 beam hole of the high flux 250kW TRIGA reactor in ILL 2075700100017 INC-SOURCE (REAC) 34.5 min of arc collimated neutron beam from 2075700100018 ILL reactor. 2075700100019 SAMPLE .He-3 gas contained in a pressure vessel. 2075700100020 .Helium was used as a shifting material between two of 2075700100021 the interferometer plates. 2075700100022 METHOD .Perfect crystal interferometry using dynamical 2075700100023 diffraction theory properties,of a monochromatic 2075700100024 coherent slow neutron beam. 2075700100025 .A (200)-reflection of an oriented graphite 2075700100026 monochromator with a mosaic spread of 3deg,was used 2075700100027 in a first arrangement giving a dispersion parameter 2075700100028 tan(tetha1)/(tan(tetha2)=1.954,then a monochromatic 2075700100029 neutron beam was collimated within 16.5 min of arc. 2075700100030 .A perfect silicon crystal was cut and polished to 2075700100031 give the E-shaped Laue-type interferometer with a 2075700100032 symmetrical (220)-reflection.The distance between 2075700100033 the three crystal plates were 27.2936+-0.0009 mm,and 2075700100034 their thicknesses were 4.3954+-0.0008 mm (within a 2075700100035 horizontal plane). 2075700100036 .The interferometer could be rotated by a suitable 2075700100037 goniometer with a 0.5 sec of arc accuracy. 2075700100038 .The width of the interf.Rocking curve was 27min arc. 2075700100039 .Behind the interferometer,deviated and forward beams 2075700100040 were collimated within 27.5 min of arc,and reached 2075700100041 each a He-3 type detector with a vertical divergency 2075700100042 of 45 min. 2075700100043 DETECTOR (IOCH) He-3 detector. 2075700100044 ANALYSIS .Experimental results were fitted to a special form 2075700100045 (see original work). 2075700100046 STATUS (TABLE) .Data taken from PL/B,71,321. 2075700100047 CORRECTION .Finite wave length resolution,errors from density and 2075700100048 pressure,index of refraction of air and long term 2075700100049 drifts were taken into account. 2075700100050 ERR-ANALYS (DATA-ERR) .Gaussian errors. 2075700100051 HISTORY (19780322C) 2075700100052 (19780705E) 2075700100053 (20140824U) SD: Updated to new date formats,lower case.2075700100054 Corrections according last EXFOR rules and Dict. 2075700100055 ENDBIB 53 0 2075700100056 NOCOMMON 0 0 2075700100057 ENDSUBENT 56 0 2075700199999 SUBENT 20757002 20140824 22402075700200001 BIB 2 5 2075700200002 REACTION (2-HE-3(N,THS)2-HE-3,COH,AMP) Free atoms. 2075700200003 MISC-COL (MISC1) Singlet scattering length datum. 2075700200004 (MISC1-ERR) Singlet scattering length error. 2075700200005 (MISC2) Triplet scattering length datum. 2075700200006 (MISC2-ERR) Triplet scattering length error. 2075700200007 ENDBIB 5 0 2075700200008 NOCOMMON 0 0 2075700200009 DATA 7 1 2075700200010 EN MISC1 MISC1-ERR MISC2 MISC2-ERR DATA 2075700200011 DATA-ERR 2075700200012 MILLI-EV FERMI FERMI FERMI FERMI FERMI 2075700200013 FERMI 2075700200014 2.5000E+01 8.0000E+00 3.0000E-01 3.0500E+00 7.0000E-02 4.2900E+002075700200015 4.0000E-02 2075700200016 ENDDATA 6 0 2075700200017 ENDSUBENT 16 0 2075700299999 ENDENTRY 2 0 2075799999999