ENTRY            20402   20180819                             22702040200000001 
SUBENT        20402001   20180819                             22702040200100001 
BIB                 17         43                                 2040200100002 
INSTITUTE  (2UK ALD)                                              2040200100003 
REFERENCE  (R,AWRE-O-03/71,1971)                                  2040200100004 
AUTHOR     (R.E.Coles)                                            2040200100005 
TITLE       Elastic and inelastic scattering of 5.0 MeV neutrons  2040200100006 
            by sodium                                             2040200100007 
FACILITY   (VDG,2UK ALD)    AWRE 6 MV Van de Graaff accelerator.  2040200100008 
INC-SOURCE (P-T)    T(p,n)He-3 reaction, tritium gas target.      2040200100009 
INC-SPECT  (EN-RSL-FW) The incident energy 5.0 MeV, the neutron   2040200100010 
            energy spread was 25 keV, mainly due to the proton    2040200100011 
            energy loss in the gas cell and the finite angle      2040200100012 
            subtended at the target by the scattering sample      2040200100013 
SAMPLE     .Produced by pouring molten pure Na metal (> 99.5% Na, 2040200100014 
            remainder mostly O2), in an argon atmosphere, into    2040200100015 
            a light cylindrical Al can of wall thickness 0.04 cm. 2040200100016 
           .The enclosed Na sample was 4.5 cm diam., 4.6 cm long  2040200100017 
            and weighed 71.093 g and was X-rayed to confirm the   2040200100018 
            absence of voids.                                     2040200100019 
MONITOR    (1-H-1(N,EL)1-H-1,,DA)  The scattering at 45 deg from  2040200100020 
            the polythene sample was measured.                    2040200100021 
MONIT-REF  (,A.Horsley,J,ND/A,2,243,1966)                         2040200100022 
METHOD     (TOF) Time of flight, flight path = 1.75 m, the spectra2040200100023 
            were obtained at ten angles between 30 and 135. degr. 2040200100024 
             * The well known neutron group energies from         2040200100025 
            n-scattering of iron were used as time calibration    2040200100026 
            and a check on incident neutron energy.               2040200100027 
DETECTOR   (SCIN)     Liquid scintillator (NE213)                 2040200100028 
REL-REF    (M,,J.H.Towle+,J,NP/A,118,500,1968) - The neutron      2040200100029 
            detection system and experimental procedures described2040200100030 
           (M,20456001,R.E.Coles+,R,AWRE-O-89/70,1970) - methods  2040200100031 
           of cross sections calculation, corrections for multiple2040200100032 
           scattering, flux attenuation and finite angular        2040200100033 
           resolution of the source-scatterer geometry and        2040200100034 
           error estimation.                                      2040200100035 
ERR-ANALYS (ERR-1) Uncertainty in detector relative efficiency    2040200100036 
CORRECTION  Corrections for multiple scattering, flux attenuation 2040200100037 
            were made using the Monte Carlo program  MAGGIE.      2040200100038 
COMMENT    Compiler: Refs for MONITOR and METHOD were taken       2040200100039 
           from 20456 Entry (see REL-REF).                        2040200100040 
HISTORY    (19710510C)                                            2040200100041 
           (20180821A) SD:Updated to new date formats,lower case. 2040200100042 
           Part of information from MONITOR moved to METHOD.      2040200100043 
           MONIT-REF, REL-REF were added. CORRECTION moved to     2040200100044 
           Subent 001.                                            2040200100045 
ENDBIB              43          0                                 2040200100046 
COMMON               3          3                                 2040200100047 
EN         EN-RSL-FW  ERR-1                                       2040200100048 
MEV        MEV        PER-CENT                                    2040200100049 
 5.0         0.025       3.                                       2040200100050 
ENDCOMMON            3          0                                 2040200100051 
ENDSUBENT           50          0                                 2040200199999 
SUBENT        20402002   20180819                             22702040200200001 
BIB                  6         17                                 2040200200002 
REACTION   (11-NA-23(N,EL)11-NA-23,,SIG)                          2040200200003 
            Integrated.                                           2040200200004 
CORRECTION  Additional corrections for finite angular resolution  2040200200005 
            of source-scatterer geometry were made using the      2040200200006 
            Monte Carlo program  MAGGIE.                          2040200200007 
ERR-ANALYS (ERR-T) The error quoted was obtained by combining in  2040200200008 
            quadrature this detector efficiency uncertainty with  2040200200009 
            the error on the a0 term of the fitted Legendre       2040200200010 
            polynomial.                                           2040200200011 
COMMENT     The integral elastic cross section of 875 +- 35 mb    2040200200012 
            is compared with the data in the present UK nuclear   2040200200013 
            data file DFN 182 (T.P.Moorhead, AEEW-R254.), i.e.    2040200200014 
            887 mb.                                               2040200200015 
STATUS     (TABLE) Table 1(a) of AWRE-O-03/71.                    2040200200016 
           (DEP,20402004) Legendre polynomial                     2040200200017 
HISTORY    (20180819U) SD: CORRECTION, ERR-ANALYS, STATUS were    2040200200018 
           updated. DATA-ERR -> ERR-T. PART-DET deleted.          2040200200019 
ENDBIB              17          0                                 2040200200020 
NOCOMMON             0          0                                 2040200200021 
DATA                 2          1                                 2040200200022 
DATA       ERR-T                                                  2040200200023 
B          B                                                      2040200200024 
 0.875        0.035                                               2040200200025 
ENDDATA              3          0                                 2040200200026 
ENDSUBENT           25          0                                 2040200299999 
SUBENT        20402003   20180819                             22702040200300001 
BIB                  5          9                                 2040200300002 
REACTION   (11-NA-23(N,EL)11-NA-23,,DA)                           2040200300003 
CORRECTION  Additional corrections for finite angular resolution  2040200300004 
            of source-scatterer geometry were made using the      2040200300005 
            Monte Carlo program  MAGGIE.                          2040200300006 
ERR-ANALYS (ERR-T) total error. Maximum total error was 4.2%,     2040200300007 
            including peak statistical errors                     2040200300008 
STATUS     (TABLE) Table 1(a) of AWRE-O-03/71.                    2040200300009 
HISTORY    (20180819U) SD: CORRECTION, ERR-ANALYS, STATUS were    2040200300010 
           updated. DATA-ERR -> ERR-T. PART-DET deleted.          2040200300011 
ENDBIB               9          0                                 2040200300012 
NOCOMMON             0          0                                 2040200300013 
DATA                 3         10                                 2040200300014 
COS-CM     DATA-CM    ERR-T                                       2040200300015 
NO-DIM     MB/SR      MB/SR                                       2040200300016 
    -0.7288       25.8        1.0                                 2040200300017 
    -0.5327       27.2        1.1                                 2040200300018 
    -0.2997       29.0        1.2                                 2040200300019 
    -0.0441       38.0        1.5                                 2040200300020 
     0.1307       37.4        1.4                                 2040200300021 
     0.3028       40.4        1.6                                 2040200300022 
     0.4666       61.4        2.4                                 2040200300023 
     0.6165       87.6        3.3                                 2040200300024 
     0.7475       148.         6.                                 2040200300025 
     0.8548       230.         9.                                 2040200300026 
ENDDATA             12          0                                 2040200300027 
ENDSUBENT           26          0                                 2040200399999 
SUBENT        20402004   20180819                             22702040200400001 
BIB                  4          6                                 2040200400002 
REACTION   (11-NA-23(N,EL)11-NA-23,,DA,,LEG)                      2040200400003 
ERR-ANALYS (DATA-ERR) error due to fitted Legendre polynomial     2040200400004 
STATUS     (TABLE) Table 1(b) of AWRE-O-03/71.                    2040200400005 
HISTORY    (20180819U) SD: ERR-ANALYS, STATUS were updated.       2040200400006 
           PART-DET deleted. CORRECTION moved to Subent 001.      2040200400007 
           NUMBER -> NUMBER-CM; DATA -> DATA-CM.                  2040200400008 
ENDBIB               6          0                                 2040200400009 
NOCOMMON             0          0                                 2040200400010 
DATA                 3          6                                 2040200400011 
NUMBER-CM  DATA-CM    DATA-ERR                                    2040200400012 
NO-DIM     MB/SR      MB/SR                                       2040200400013 
         0.       69.7        1.8                                 2040200400014 
         1.       97.8        4.6                                 2040200400015 
         2.      100.4        6.0                                 2040200400016 
         3.       74.1        6.6                                 2040200400017 
         4.       44.6        5.5                                 2040200400018 
         5.       14.1        4.1                                 2040200400019 
ENDDATA              8          0                                 2040200400020 
ENDSUBENT           19          0                                 2040200499999 
SUBENT        20402005   20180819                             22702040200500001 
BIB                  5         20                                 2040200500002 
REACTION   (11-NA-23(N,INL)11-NA-23,PAR,SIG)                      2040200500003 
            integrated                                            2040200500004 
ANALYSIS   (4PI1A)                                                2040200500005 
            The 439 keV level is considerably interfered          2040200500006 
            with by the elastic peak. But a shape for elastic peak2040200500007 
            can be subtracted from the full spectrum to leave the 2040200500008 
            inelastic spectrum.                                   2040200500009 
ERR-ANALYS (ERR-T) Total error in extracting individual inelastic 2040200500010 
            peak areas, was estimated to be 5 or 7% in the peak   2040200500011 
            area.                                                 2040200500012 
           .Since inelastic angular distributions were isotropic, 2040200500013 
            the integrated cross sections were taken as 4pi times 2040200500014 
            the means of the measured differential cross sections,2040200500015 
            each weighted according to its error, and errors      2040200500016 
            quoted on inelastic integrated cross sections are the 2040200500017 
            standard deviation of these means.                    2040200500018 
STATUS     (TABLE) Table 2 of AWRE-O-03/71.                       2040200500019 
HISTORY    (20180819U) SD: ERR-ANALYS, STATUS were updated.       2040200500020 
           DATA-ERR -> ERR-T. PART-DET deleted. CORRECTION moved  2040200500021 
           to Subent 001.                                         2040200500022 
ENDBIB              20          0                                 2040200500023 
NOCOMMON             0          0                                 2040200500024 
DATA                 3          7                                 2040200500025 
E-LVL      DATA       ERR-T                                       2040200500026 
MEV        B          B                                           2040200500027 
      0.439      0.240      0.016                                 2040200500028 
       2.08      0.105      0.007                                 2040200500029 
       2.39      0.038      0.004                                 2040200500030 
       2.68      0.110      0.011                                 2040200500031 
       2.98      0.100      0.009                                 2040200500032 
       3.68      0.087      0.009                                 2040200500033 
       3.88      0.125      0.013                                 2040200500034 
ENDDATA              9          0                                 2040200500035 
ENDSUBENT           34          0                                 2040200599999 
SUBENT        20402006   20180819                             22702040200600001 
BIB                  5         17                                 2040200600002 
REACTION   (11-NA-23(N,INL)11-NA-23,,SIG) total inelastic         2040200600003 
COMMENT    .The total inelastic cross section of 805 +- 53 mb     2040200600004 
            is compared with the data in the present UK nuclear   2040200600005 
            data file DFN 182 (T.P.Moorhead, AEEW-R254.), i.e.    2040200600006 
            870 mb.                                               2040200600007 
ERR-ANALYS (ERR-T) Errors are one standard deviation.             2040200600008 
           .Since inelastic angular distributions were isotropic, 2040200600009 
            the integrated cross sections were taken as 4pi times 2040200600010 
            the means of the measured differential cross sections,2040200600011 
            each weighted according to its error, and errors      2040200600012 
            quoted on inelastic integrated cross sections are the 2040200600013 
            standard deviation of these means.                    2040200600014 
STATUS     (TABLE) From p.5 of AWRE-O-03/71.                      2040200600015 
           (DEP,20402005) Partial cr.sect.                        2040200600016 
HISTORY    (20180819U) SD: ERR-ANALYS, STATUS were updated.       2040200600017 
           DATA-ERR -> ERR-T. PART-DET deleted. CORRECTION        2040200600018 
           moved to Subent 001.                                   2040200600019 
ENDBIB              17          0                                 2040200600020 
NOCOMMON             0          0                                 2040200600021 
DATA                 2          1                                 2040200600022 
DATA       ERR-T                                                  2040200600023 
B          B                                                      2040200600024 
  0.805       0.053                                               2040200600025 
ENDDATA              3          0                                 2040200600026 
ENDSUBENT           25          0                                 2040200699999 
ENDENTRY             6          0                                 2040299999999