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99-Es-253 NEA RCOM-JUN82 SCIENTIFIC CO-ORDINATION GROUP
DIST-JAN09 20090105
----JEFF-311 MATERIAL 9913
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
*************************** JEFF-3.1.1 *************************
** **
** Original data taken from: JEFF-3.1 **
** **
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***************************** JEFF-3.1 *************************
** **
** Original data taken from: JEF-2.2 **
** **
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* JEF-2 *
* DATA WERE TAKEN FROM ENDF/B-V(MAT=8953). *
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* 3-JAN-85: RADIOACTIVE DECAY DATA DELETED.
* 4-JAN-85: Q-VALUE FOR MT=102 CORRECTED
* 7-APR-88: CHANGE OF THE FLAG FROM SINGLE LEVEL TO MULTI LEVEL
* BREIT-WIGNER RESONANCE PARAMETERS.FOR THE SPIN OF
* L=0,RESONANCES HAVE BEEN RANDOMLY ASSIGNED BY THE
* COMPUTER CODE RNDSPIN (H. GRUPPELAAR)
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BNL,SRL EVAL-JUL76 KINSEY,BENJAMIN, AND MCCROSSON
DIST-DEC78 790307
WORK BASED ON THE FOLLOWING EVALUATION CONVERTED TO ENDF/B
-V FORMATS AND MERGED WITH THE RADIOACTIVE DECAY DATA OF C. REICH
* * * * * *
EINSTEINIUM-253 EVALUATION DECEMBER 1975 - R.W.BENJAMIN AND
F.J.MCCROSSON AT SRL
* * * * * *
MF=2 RESONANCE PARAMETERS(0 TO 10 KEV)
MT=151 RESOLVED RESONANCES RESONANCE PARAMETERS DETERMINED BY
THE GENRPAR CODE(REF.1) BASED UPON RESONANCE INTEGRALS AND
THERMAL CROSS SECTIONS FROM INTEGRAL(REF.2) AND PRODUCTION
(REF.3) MEASUREMENTS. THE LARGE RESONANCE INTEGRAL AND RELA-
TIVELY SMALL THERMAL CROSS SECTION FROM THE MEASUREMENTS DIC-
TATED THAT THE GENRPAR CALCULATIONS USE AN UNUSUALLY LARGE
STRENGTH FUNCTION(1.84E-04) COUPLED WITH A VERY SMALL RADIA-
TION WIDTH(20 MILLIVOLTS). THE NEED FOR SUCH EXTREME VALUES
CASTS SUSPICION ON THE VERY LOW 2200 M/S CAPTURE CROSS SEC-
TION()3 BARNS) DEDUCED BY HARBOUR AND MACMURDO(REF.2) FOR
THE FORMATION OF ES-254G. RESOLVED REGION - 0 TO 101.2 EV.
UNRESOLVED RESONANCES SAME BASIS AS RESOLVED WITH AVER-
AGE RESONANCE PARAMETERS. UNRESOLVED REGION - 101.2 EV TO
10 KEV.
NOTE: A BOUND LEVEL AT -2.057 EV WAS REMOVED FROM THE SRL
EVALUATION AND APPROPRIATE BACKGROUND CROSS SECTIONS ADDED.
CROSS SECTION SIGMA(0.0253 EV) I(0.5 EV - 20 MEV)
TOTAL 209.841
ELASTIC 8.799
CAPTURE 201.042 6336.81
MF=3 BACKGROUND CROSS SECTION(1.-5EV TO 10KEV)
MT=1 SUM OF EL AND NG BACKGROUNDS.
MT=2 CONSTANT BACKGROUND UP TO THE FIRST RESONSANCE THEN GOING
RAPIDLY TO ZERO. CONSTANT CHOSEN TO GIVE A THERMAL CROSS
SECTION EQUAL TO 90( OF THE SPHERICAL OPTICAL MODEL VALUE.
MT=102 CALCULATED TO GIVE THE SAME CURVE AS WAS OBTAINED
WHEN THE BOUND LEVEL WAS INCLUDED.
MF=3 SMOOTH CROSS SECTIONS(10 KEV TO 20 MEV)
*** THE DATA IN FILE 3 ARE GIVEN ONLY SO THAT THE VARIOUS
PROCESSING CODES CAN WORK. CONTINUITY WITH THE UNRESOLVED
REGION IS PROVIDED, BUT THE CROSS SECTIONS DROP IMMEDIATELY
TO ZERO. THE ELASTIC CROSS SECTION IS THE POTENTIAL SCATTER-
ING CROSS SECTION CALCULATED WITH A SPHERICAL OPTICAL MODEL
POTENTIAL AT 10 KEV.
MF=4 ANGULAR DISTRIBUTIONS
MT=2 ELASTIC
DISTRIBUTIONS TAKEN FROM ENDF/B-V CF-251
REFERENCES
1. F.J.MCCROSSON,PROC.CONF.NEUT.CROSS SECT.AND TECH.,KNOXVILLE
TN,MARCH 1971,P.714.
2. R.M.HARBOUR AND K.W.MACMURDO,J.INORG.NUCL.CHEM.35(1973)1821.
3. R.W.BENJAMIN,F.J.MCCROSSON,V.D.VANDERVELDE,AND T.C.GORRELL,
USERDA REPORT DP-1394(1975).
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