ENTRY 23503 20190516 22802350300000001 SUBENT 23503001 20190516 22802350300100001 BIB 14 32 2350300100002 TITLE Longitudinal asymmetry in a neutron radiative capture 2350300100003 reaction of 139La 2350300100004 AUTHOR (Y.Masuda,T.Adachi,A.Masaike,K.Morimoto) 2350300100005 REFERENCE (J,NP/A,504,269,1989) 2350300100006 INSTITUTE (2JPNKEK) Y.Masuda,T.Adachi,K.Morimoto 2350300100007 (2JPNKTO) A.Masaike 2350300100008 FACILITY (SYNCH,2JPNKEK) 2350300100009 INC-SOURCE (POLNS,SPALL) Neutrons were polarized by a polarized 2350300100010 proton filter installed at 5.2 m from neutron source. 2350300100011 SAMPLE La disks of 2.5 cm diameter, 2350300100012 thickness t= 0.3, 1., 3. cm, 2350300100013 placed at 6.5 m from neutron source. 2350300100014 DETECTOR (BAF2) For gammas detection 2350300100015 (SCIN) 10B-loaded liquid scintillator NE311A for 2350300100016 transmitted neutron detection, placed at 9.4 m from 2350300100017 the neutron source. 2350300100018 (FISCH) Uranium fission chamber for incident neutron 2350300100019 beam monitoring, placed at 4m distance . 2350300100020 METHOD (TOF) For incident neutrons energy measurement 2350300100021 ANALYSIS Longitudinal asymmetry A was determined as 2350300100022 A=( SIG(+) - SIG(-) )/( SIG(+) + SIG(-) ), 2350300100023 + and - means positive and negative helicity states, 2350300100024 SIG - cross section. 2350300100025 CORRECTION For background . 2350300100026 COMMENT Of authors. Average value of asymmetry in the energy 2350300100027 region 0.3 - 10 eV was < 10**-3 except the resonance 2350300100028 region . 2350300100029 For unpolarized neutrons, the asymmetry in p-wave 2350300100030 resonance disappeared within statistical error. 2350300100031 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 2350300100032 article. 2350300100033 HISTORY (20190303C) M.M. 2350300100034 ENDBIB 32 0 2350300100035 NOCOMMON 0 0 2350300100036 ENDSUBENT 35 0 2350300199999 SUBENT 23503002 20190516 22802350300200001 BIB 4 9 2350300200002 REACTION (57-LA-139(N,G)57-LA-140,LON,POL,,DSP/ASY/MSC) 2350300200003 Longitudinal asymmetry at resonance 0.734 eV 2350300200004 ANALYSIS Derived as average of four values from Subent 003 2350300200005 REL-REF (A,,Y.Masuda+,J,NP/A,478,737C,1988) 2350300200006 (10.2+-0.5) % 2350300200007 (N,22250001,H.M.Shimizu+,J,NP/A,552,293,1993) 2350300200008 Next measurement, improved setup 2350300200009 STATUS (TABLE) Table 1 of Nucl.Phys.A,v.504,p.269,1989 2350300200010 (DEP,23503003) Directly measured data 2350300200011 ENDBIB 9 0 2350300200012 NOCOMMON 0 0 2350300200013 DATA 3 1 2350300200014 EN-RES DATA DATA-ERR 2350300200015 EV NO-DIM NO-DIM 2350300200016 0.734 9.5 E-02 0.3 E-02 2350300200017 ENDDATA 3 0 2350300200018 ENDSUBENT 17 0 2350300299999 SUBENT 23503003 20190516 22802350300300001 BIB 6 19 2350300300002 REACTION (57-LA-139(N,G)57-LA-140,LON,POL,,DSP/ASY/MSC) 2350300300003 Longitudinal asymmetry at resonance 0.734 eV 2350300300004 ANALYSIS Along was determined from measurements of EPSgamma 2350300300005 EPSgamma= 2350300300006 =(1/Pn)*(((Ngamma(+)-Ngamma(-))/(Ngamma(+)+Ngamma(-))),2350300300007 where 2350300300008 t -target thickness 2350300300009 Pn - neutron polarization 2350300300010 T - sample temperature 2350300300011 t,cm T,K EPSgamma,% 2350300300012 FLAG (1.) 0.3 40. 8.8+-0.4 2350300300013 (2.) 1.0 40. 7.8+-0.3 2350300300014 (3.) 1.0 310. 8.0+-0.3 2350300300015 (4.) 3.0 56. 6.6+-0.3 2350300300016 REL-REF (A,,Y.Masuda+,J,NP/A,478,737C,1988) 2350300300017 (10.2+-0.5) % 2350300300018 CORRECTION For neutron scattering and neutron beam attenuation 2350300300019 in sample. 2350300300020 STATUS (TABLE) Table 1 of Nucl.Phys.A,v.504,p.269,1989 2350300300021 ENDBIB 19 0 2350300300022 COMMON 1 3 2350300300023 EN-RES 2350300300024 EV 2350300300025 0.734 2350300300026 ENDCOMMON 3 0 2350300300027 DATA 5 4 2350300300028 POL-BM POL-BM-ERR DATA DATA-ERR FLAG 2350300300029 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 2350300300030 65. 2. 9.4 E-02 0.5 E-02 1. 2350300300031 73. 2. 9.5 E-02 0.3 E-02 2. 2350300300032 74. 2. 9.5 E-02 0.4 E-02 3. 2350300300033 69. 2. 9.5 E-02 0.4 E-02 4. 2350300300034 ENDDATA 6 0 2350300300035 ENDSUBENT 34 0 2350300399999 SUBENT 23503004 20190516 22802350300400001 BIB 4 7 2350300400002 REACTION (57-LA-139(N,TOT),LON,POL,,DSP/ASY/MSC) 2350300400003 Longitudinal asymmetry at resonance 0.734 eV 2350300400004 METHOD (TRN) 2350300400005 REL-REF (D,,V.P.Alfimenkov+,J,NP/A,398,93,1983) 2350300400006 (7.3+-0.5) % 2350300400007 STATUS (TABLE) Table 1 of Nucl.Phys.A,v.504,p.269,1989 2350300400008 (SPSDD,22250002) Newer publication 2350300400009 ENDBIB 7 0 2350300400010 NOCOMMON 0 0 2350300400011 DATA 3 1 2350300400012 EN-RES DATA DATA-ERR 2350300400013 EV NO-DIM NO-DIM 2350300400014 0.734 9.7 E-02 0.5 E-02 2350300400015 ENDDATA 3 0 2350300400016 ENDSUBENT 15 0 2350300499999 SUBENT 23503005 20190516 22802350300500001 BIB 3 4 2350300500002 REACTION (57-LA-138(N,G)57-LA-139,LON,POL,,DSP/ASY/MSC) 2350300500003 Longitudinal asymmetry at resonance 2.99 eV 2350300500004 SAMPLE La-138 content 0.09 % . 2350300500005 STATUS (TABLE) Text p.274 of Nucl.Phys.A,v.504,p.269,1989 2350300500006 ENDBIB 4 0 2350300500007 NOCOMMON 0 0 2350300500008 DATA 3 1 2350300500009 EN-RES DATA DATA-ERR 2350300500010 EV NO-DIM NO-DIM 2350300500011 2.99 0.01E-02 0.05E-02 2350300500012 ENDDATA 3 0 2350300500013 ENDSUBENT 12 0 2350300599999 ENDENTRY 5 0 2350399999999