ENTRY            10848   19800722                             00001084800000001 
SUBENT        10848001   19800722                             00001084800100001 
BIB                 12         46                                 1084800100002 
INSTITUTE  (1USAORL)                                              1084800100003 
REFERENCE  (R,ORNL-TM-6805,7909)                                  1084800100004 
AUTHOR     (R.R.SPENCER,R.GWIN,R.INGLE,H.WEAVER)                  1084800100005 
TITLE      INTERIM REPORT ON THE ORNL ABSOLUTE MEASUREMENTS OF    1084800100006 
            AVERAGE PROMPT NU-BAR FOR CF-252                      1084800100007 
FACILITY   (LINAC) OAK RIDGE ELECTRON LINEAR ACCELERATOR          1084800100008 
DETECTOR   (SCIN) 900-LITER NE-224 ALUMINUM SCINTILLATION TANK    1084800100009 
            WITH GADOLINIUM. SURROUNDED WITH THICK MARBLE WALL TO 1084800100010 
            REDUCE BACKGROUND FROM K-40. HORIZONTAL THROUGH-TUBE  1084800100011 
            OF 13.69-CM INNER DIAMETER ALUMINUM USED AS BEAM PATH.1084800100012 
             PROTON RECOIL NE-213 LIQUID SCINTILLATOR PLACED IN   1084800100013 
            NEUTRON BEAM AND NORMAL TO IT. 4.45-CM IN DIAMETER AND1084800100014 
            0.6-CM THICK WITH PULSE SHAPE DISCRIMINATION.         1084800100015 
           (FISCH) CF FISSION CHAMBER LOCATED ABOVE BEAM. CONSISTS1084800100016 
            OF A 0.0004 MICRO-GRAM, 0.5-CM DIAMETER CIRCLE OF CF  1084800100017 
            ON NICKEL FOIL OVERCOATED WITH GOLD. CHAMBER FILLED TO1084800100018 
            1-ATM WITH METHANE.                                   1084800100019 
MONITOR    (1-H-1(N,EL)1-H-1,,SIG) PROTON RECOIL DATA USED TO     1084800100020 
            NORMALIZE A MONTE CARLO CALCULATION FOR TOTAL         1084800100021 
            SCINTILLATOR TANK EFFICIENCY.                         1084800100022 
           SCINTILLATOR TANK PULSE HEIGHT RESPONSE CHECKED USING  1084800100023 
            CF-252 FISSION GAMMAS,NEUTRON ABSORPTION GAMMA        1084800100024 
            RAYS AND GAMMA RAY SOURCES.                           1084800100025 
METHOD     (TOF) TIME OF FLIGHT. FISSION EVENTS SIGNALED BY       1084800100026 
            COINCIDENCE BETWEEN FISSION CHAMBER AND PROMPT        1084800100027 
            SCINTILLATOR TANK PULSES FROM FISSION GAMMAS. NEUTRONS1084800100028 
            SCATTERED FROM BEAM SIGNALED BY PROTON RECOIL PULSE.  1084800100029 
            GRAPHITE USED TO FILL IN SCINTILLATOR THROUGH-TUBE TO 1084800100030 
            MINIMIZE EFFECTS OF ASYMMETRY. DETECTOR EFFICIENCY    1084800100031 
            FROM 0.5 TO 7.125 MEV DETERMINED USING NEUTRON WHITE  1084800100032 
            SOURCE.                                               1084800100033 
CORRECTION CORRECTIONS MADE FOR-                                  1084800100034 
            -BACKGROUND                                           1084800100035 
            -SYSTEM DEAD TIME                                     1084800100036 
            -AVERAGE SCINTILLATOR TANK EFFICIENCY                 1084800100037 
            -PULSE PILE-UP                                        1084800100038 
            -ABSORPTION BY PROTON RECOIL PHOTOMULTIPLIERS         1084800100039 
            -OFF- AXIS POSITION OF CF-252 SOURCE                  1084800100040 
            -DELAYED GAMMAS                                       1084800100041 
            -FISSION CHAMBER DISCRIMINATION LEVEL                 1084800100042 
            -FISSION LOSS DUE TO TANK COINCIDENCE                 1084800100043 
            -MONTE CARLO UNCERTAINTY                              1084800100044 
            -FALSE FISSION EVENTS                                 1084800100045 
ERR-ANALYS ERRORS CONTRIBUTED BY UNCERTAINTIES IN CORRECTIONS     1084800100046 
STATUS     (APRVD) APPROVED BY R.R.SPENCER, 80/7/18.              1084800100047 
HISTORY    (800312C)                                              1084800100048 
ENDBIB              46          0                                 1084800100049 
NOCOMMON             0          0                                 1084800100050 
ENDSUBENT           49          0                                 1084800199999 
SUBENT        10848002   19811120                             00001084800200001 
BIB                  2          2                                 1084800200002 
REACTION   (98-CF-252(0,F),PR,NU)                                 1084800200003 
HISTORY    (811120A) REACTION CORRECTED.                          1084800200004 
ENDBIB               2          0                                 1084800200005 
NOCOMMON             0          0                                 1084800200006 
DATA                 2          1                                 1084800200007 
DATA       DATA-ERR                                               1084800200008 
NO-DIM     NO-DIM                                                 1084800200009 
 3.783      0.010                                                 1084800200010 
ENDDATA              3          0                                 1084800200011 
ENDSUBENT           10          0                                 1084800299999 
ENDENTRY             2          0                                 1084899999999