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30-Zn- 0 FEI EVAL-DEC89 NIKOLAEV M.N.AND ZABRODSKAJA S.V
DIST-JAN09 20090105
----JEFF-311 MATERIAL 3000
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
*************************** JEFF-3.1.1 *************************
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** Original data taken from: JEFF-3.1 **
** **
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***************************** JEFF-3.1 *************************
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** Original data taken from: JEFF-3.0 **
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***************************** JEFF-3.0 ***********************
DATA TAKEN FROM :- BROND-2.2 (DIST-OCT91 REV1-OCT91)
Photon production data discarded
since it use a special format not
approved by CSEWG
******************************************************************
******************************************************************
THE EVALUATION OF NEUTRON CROSS SECTIONS FOR NATURAL ZINK IS
MADE BY M.N.NIKOLAEV AND ZABRODSKAJA S.V.(PHOTON PRODUCTION DATA)
* FROM POINT OF VIEW OF NUCLEAR TECHNOLOGY THE HIGH *
* ACCURACY OF NEUTRON DATA FOR ZN IS NOT REQUIRED. *
* THE DATA GIVEN HERE SATISFIED REQUIREMENTS FORMU- *
* LATED IN WRENDA 87/88, EXCLUDING THE DATA FOR PRO- *
* DUCTION OF LONG-LIVED ISOTOPE NICKEL-63 (T 1/2=100 *
* YEARS). THERE ARE NO EXPERIMENTAL DATA FOR CROSS *
* SECTIONS OF THE REACTIONS ZN-64(N,2P), *
* ZN-66(N,ALFA), ZN-66(N,N+HE3), ZN-67(N,N+ALFA), *
* ZN-68(N,2N+ALFA), WHICH YIELD NICKEL-63. *
REV1: RADIOACTIVE ISOTOPE PRODUCTION DATA ARE DELETED.
THESE DATA WILL BE PRESENTED AS THE DATA FOR
SEPARETED ISOTOPES (SEE MAT 3064,3066,3067,3068,3069).
SOME ERRORS ARE CORRECTED.
--------------------------------------------------
* CROSS SECTIONS AT 0.0253 EV: *
* ELASTIC (MT=2)- (4.08+-0.03)BARN *
* CAPTURE (MT=102)-(1.11+-0.02)BARN *
* REACTION (N,ALFA) (MT=107) - 10 MICROBARN *
--------------------------------------------------
COMMENTS:
MF=1 GENERAL INFORMATION
-------------------
MT=451- DATA DESCRIPTION WAS MADE BY M.N.NIKOLAEV.
MF=2 RESONANCE PARAMETERS.
--------------------
MT=151- RESONANCE REGION EXTENTS FROM 10-5 EV TO 10+5 EV.
CROSS SECTIONS IN THIS REGION ARE DESCRIBED ONLY BY
RE SOLVED RESONANCE PARAMETERS. THESE PARAMETERS ARE
TAKEN FROM MUGHABGHAB'S COMPILATIONS /1/. IT SHOULD
BE NOTED THAT RESONANCES OF MAIN ISOTOPES OF ZINK
ARE RESOLVED UP TO > 350 KEV. NOT ALL KNOWN RESONAN-
CE PARAMETERS ARE GIVEN HERE BECAUSE OF SMALL SIGNI-
FICANCE OF TAKING INTO ACCOUNT RESONANCE STRUCTURE
OF ZINK CROSS SECTIONS IN PRACTICAL CALCULATIONS AND
THE FAST GROWTH OF THE NUMBER OF MISSING WEAK LEVELS
ABOVE 100 KEV. IF IT WOULD BE NECESSARY IT IS POSSIB-
LE TO EXTEND THE RESOLVED RESONANCE REGION. THE UN-
RESOLVED RESONANCE REGION IS NATURALLY NOT GIVEN.
MF=3 REACTION CROSS SECTIONS
-----------------------
ALL CROSS SECTIONS BELOW 100 KEV IS FULLY DESCRIBED
BY RESOLVED RESONANCE PARAMETERS. IN FILE 3 ZERO
CROSS SECTIONS IN THIS REGION ARE GIVEN.
MT=1 - THE TOTAL CROSS SECTION IN THE RANGE OF 100 - 350
KEV IS OBTAINED ON THE BASE OF RESOLVED RESONANCE
PARAMETERS BY AVERAGING IN INTERVALS DELTA U=0.064.
IN THE REGION 0.35-20 MEV THE TOTAL CROSS SECTION
IS ACCEPTED IN ACCORDANCE WITH THE EYE QUIDE CURVE
FROM THE REF./2/.
MT=2 - ELASTIC SCATTERING CROSS SECTION IN THE RANGE 100 -
126 KEV IS CALCULATED USING RESOLVED RESONANCE PARA-
METERS AND EQUAL TO THE DIFFERENCE BETWEEN TOTAL AND
RADIATIVE CAPTURE CROSS SECTIONS.IN THE RANGE 0.126-
20 MEV ELASTIC SCATTERING CROSS SECTION IS EQUAL TO
THE DIFFERENCE BETWEEN TOTAL AND SUMMED CROSS SECTI-
ONS OF THE ALL NONELASTIC INTERACTIONS.
MT=4 - INELASTIC SCATTERING CROSS SECTION BELOW 1 MEV IS AC-
CEPTED EQUAL TO ZERO. IT MEANS THAT INELASTIC SCAT-
TERING CROSS SECTIONS ON LOW-LYING LEVELS OF ZN-67
ARE CONSIDERED NEGLIGIBLE. THE REASON IS SMALL ABuN-
DANCE (4.1%) OF ZN-67. ABOVE 1 MEV TOTAL INELASTIC
SCATTERING CROSS SECTION IS ACCEPTED IN ACCORDANCE
WITH THE CURVE FROM THE REF /2/.
MT=16 - (N,2N)-REACTION CROSS SECTION WAS MEASURED IN DETAIL
ONLY FOR ZN-64 AND ZN-66. FOR ZN-68 THERE ARE DATA AT
14 MEV ONLY AND THE RESULT OBTAINED IS CLOSE TO THAT
FOR ZN-66. THE (N,2N)-REACTION THRESHOLD FOR ZN-68 IS
LOWER THAN THAT FOR ZN-66 ON 0.9 MEV.THEREFORE IT WAS
DECIDED TO CONSIDER THE (N,2N)-REACTION CROSS SECTI-
ONS FOR BOTH ISOTOPES TO BE EQUAL. THE CROSS SECTI-
ONS GIVEN IN MT=16 ARE OBTAINED BY AVERAGING:
SIG-2N(64)*ABN(64)+SIG-2N(66)*(ABN(66)+ABN(68))
----------------------------------------------- =
ABN(64)+ABN(66)+ABN(68)
=0.51*SIG-2N(64)+0.49*SIG-2N(66)
MT=17 - (N,3N)-REACTION CROSS SECTION. IS EVALUATED
USING COSEQUENTIVE EVAPORATION MODEL.
MT=22 - (N,N+ALFA)-REACTION CROSS SECTION. THE THRESHOLDS OF
THIS REACTION FOR ZINK ISOTOPES ARE BETWEEN 4 MEV
(ZN-64) AND 6 MEV (ZN-70).THE RELIABLE EXPERIMENTAL
DATA FOR CROSS SECTIONS OF THESE REACTIONS ARE AB-
SENT. IN REF. /3/ THE (N,N+ALFA)-REACTION CROSS SEC-
TION FOR ZN-64 AT 14 MEV FINDEN EQUAL TO ABOUT 80
MILLIBARNS. FOR MORE HEAVY ZN-ISOTOPES THE BINDING
ENERGY OF NEUTRON BECOME LOWER AND THOSE FOR ALFA-
PARTICLE BECOME UPPER. THEREFORE FOR NATURAL ZN THE -
CROSS SECTION OF REACTION CONSIDERED MUST BE LESS
THAN FOR ZN-64. THIS CROSS SECTION IS ACCEPTED EQUAL
TO 45 MILLIBARNS AT 14 MEV AND SUPPOSED THAT IT INC-
REASED UP TO 60 MILLIBARNS AT 20 MEV. THE RADIONUC-
LIDES AS A RESULT OF (N,N+ALFA)-REACTION FOR MAIN ZN-
ISOTOPES ARE NOT PRODUCED. THE ZN-70 (ABUNDANCE 0.6%)
GIVES NI-66 (WITH HALF LIFE 2.28 DAYS) AS THE PRODUCT
OF (N,N+ALFA)-REACTION. THE CROSS SECTION OF THIS
REACTION IS 0.6+-0.1 MILLIBARNS AT 14-15 MEV (FOR
ISOTOPE), THE THRESHOLD - 6.05 MEV. ZN-67 (ABUNDANCE
4.1%) GIVES LONG-LIVED NI-63 (HALE LIFE 100 YEARS).
THE THREHOLD OF THE REACTION IS 5.41 MEV. THE CROSS
SECTION WAS NOT MEASURED. ONE SHOULD SUPPOSE IT TO
BE ABOUT ONE MILLIBARN.
MT=24 - THE CROSS SECTIONS OF (N,2N+ALFA)-REACTION ARE NOT
GIVEN. THE EXPERIMENTAL DATA ARE ABSENT. THE THRE-
SHOLDS OF THESE REACTIONS FOR THE MAIN ZN ISOTOPES
ARE ABOVE 15 MEV. AS A RESULT OF THIS REACTION THE
ZN-68 (ABUNDANCE 18.8%) GIVES LONG-LIVED ISOTOPES
NI-63 (HALE LIFE 100 YEARS). THE REACTION UNDER CON-
SIDERATION DOES NOT LEAD TO RADIONUCLIDE PRODUCTION
FOR OTHER MAIN ZN ISOTOPES.
MT=28 - (N,N+P) REACTION CROSS SECTION. FOR MAIN ISOTOPE
ZN-64 IT IS FOUND THAT THE CROSS SECTION OF THESE
REACTION AT 14 MEV IS EQUAL TO 370 MILLIBARNS /4/.SO
GREAT CROSS SECTION IS DUE TO GREAT DIFFERENCE BETWE-
EN BINDING ENERGY OF NEUTRON AND THOSE OF PROTON IN
ZN-64 (11.9-7.7=4.2 MEV). THIS DIFFERENCE FOR ZN-66
DECREASES TO 2.2 MEV. FOR MORE HEAVY ISOTOPES THE
BINDING ENERGY OF PROTON IS ABOVE THAT OF NEUTRON.
THEREFORE OT IS NOT SURPRISINGLY THAT THE CROSS SEC-
TION OF THIS REACTION FOR ZN-67 AND ZN-68 EVEN
TOGETHER WITH (N,D)-REACTION CROSS SECTION IS EQUAL
TO A FEW MILLIBARNS /5/. THEREFORE AT THE 20 MEV THE
CONTRIBUTION OF ZN-64 CROSS SECTION INTO THE SUMMA-
RIZED CROSS SECTION SHOULD BE CONSIDERED AS MAIN AND
AT 14 MEV IT WAS ADOPTED EQUAL TO 90%.
MT=32 - (N,N+D) REACTION CROSS SECTION,
MT=33 - (N,N+T) REACTION CROSS SECTION,
MT=34 - (N,N+HE3) REACTION CROSS SECTION,
MT=41 - (N,2N+P) REACTION CROSS SECTION. THE CROSS SECTIONS
OF ALL THESE REACTIONS ARE NOT GIVEN BECAUSE OF AB-
SENCE OF DATA AND HIGH REACTION THRESHOLDS (ABOVE
16.5 MEV). THE REACTION OF ZN-66(N,N+HE3) DOES NOT
GIVE AN ESSENTIAL CONTRIBUTION TO THE FORMATION OF
LONG-LIVED RADIONUCLIDE NI-63.
MT=51 - THE INELASTIC SCATTERING ON THE FIRST LEVEL. ALL THE
MAIN ZN ISOTOPES HAVE EXCITATION ENERGY OF THE FIRST
2+ LEVEL NEARLY 1 MEV (FROM 0.991 MEV FOR ZN-64 TO
1.039 MEV FOR ZN-66). SO FOR NATURAL ZN THE ENERGY
1 MEV IS ACCEPTED FOR THE FIRST LEVEL. THE EXCITATI-
ON FUNCTION OF THIS LEVEL WAS OBTAINED AS A DIFFE-
RENCE BETWEEN THE TOTAL NONELASTIC CROSS SECTION AND
THE SUM OF CROSS SECTIONS MT=16,22,28.91,102,103,105,
107. THUS IT WAS SUPPOSED THAT THE CONTRIBUTION OF
DIRECT AND PREEQUILIBRIUM PROCESS IS INCLUDED IN THE
EXCITATION FUNCTION OF THIS LEVEL.
MT=91 - THE INELASTIC SCATTERING IN CONTINUM INCLUDE THE EX-
CITATION OF ALL LEVELS EXCEPT FIRST. ABOVE 10 MEV
THE CROSS SECTION IS ACCEPTED EQUAL TO ZERO ACCOR-
DING TO ESTIMATION OF THE RATIO OF (N,N') AND (N,2N)-
REACTION CROSS SECTIONS IN THE FRAME OF EVAPORATION
MODEL.
MT=102- RADIATIVE CAPTURE CROSS SECTION IN THE 100-126 KEV
IS CALCULATED ON THE BASE OF RESOLVED RESONANCE PA-
RAMETERS. THE AVERAGE VALUE OF RADIATION WIDTH WAS
USED. ABOVE 126 KEV THE RADIATION CAPTURE CROSS
SECTION CALCULATED ON THE BASE OF RESOLVED RESO-
NANCES BECOMES ESS0ENTIALLY LOWER THAN EXPERIMENTAL
RESULTS REF./2/ BECAUSE OF MISSING "WEAK" P- AND D-
LEVELS. THUS THE CROSS SECTION IN THIS RANGE IS EVA-
LUATED ON THE BASE OF EXPERIMENTAL DATA FROM REF./2/.
MT=103- (N,P)-CROSS SECTION. FOR THE MAIN ISOTOPE ZN-64
THE (N,P)-REACTION IS EXOTHERMIC. THE RESULT OF THIS
REACTION IS CU-64 WITH THE HALF LIFE 12.7 HOURS.
THE CROSS SECTION WAS MEASURED BY MANY AUTHORS /2/
(ACTIVATION METHOD). THE ACCURACY IS ABOUT 20%. ZN-66
HAS THE THRESHOLD OF (N,P)-REACTION EQUAL TO 1.888
MEV.IN THIS CASE THE CU-66 WITH HALE LIFE 5.1 MIN IS
PRODUCED. THE ACCURACY OF THIS CROSS SECTION ALSO IS
CLOSE TO 20%. FOR ZN-67 THE ENERGY OF (N,P)-REACTION
IS CLOSE TO THAT FOR ZN-64. THE CROSS SECTION IS OB-
TAINED BY RENORMALIZATION OF THE ZN-64 CURVE TO ZN-67
CROSS SECTION MEASURED AT 14 MEV. THE CROSS SECTIONS
FOR ZN-68 AND ZN-70 HAVING GREAT ENERGY THRESHOLDS
WERE EVALUATED ON THE AVAILABLE DATA AT 14-15 MEV AND
THRESHOLD ENERGY VALUES.
MT=104 -(N,D)-CROSS SECTION IS ACCEPTED NEGLIGIBLE AND NOT
GIVEN. FOR MAIN ZN-ISOTOPES THE BINDING ENERGY OF
NEUTRON IS ESSENTIALLY GREATER THEN THAT OF PROTON.
ACCORDING TO THE SYSTEMATIC /5/ SUCH NUCLEI HAVE THE
(N,NP)-REACTION CROSS SECTIONS SOME TENS TIMES MORE
THAN THE (N,D)-REACTION CROSS SECTIONS.
MT=105- (N,T)-REACTION CROSS SECTION. THE THRESHOLDS OF THIS
REACTION OF MAIN ZN ISOTOPES ARE CLOSE TO EACH OTHER
(FROM 10.2 TO 10.7 MEV). CROSS SECTIONS WERE MEASURED
ONLY FOR ZN-64. DISCREPANCIES AMONG DATA OF DIFFERENT
AUTHORS ARE VERY GREAT (FROM 33 TO 150 MICRO BARNS).
THE CROSS SECTION FOR NATURAL ZN AT 14 MEV WAS ADOP-
TED EQUAL TO 100 MICRO BARN.
MT=106 -THE (N.HE3)- REACTION CROSS SECTION WAS NOT MEASURED
AND NOT GIVEN HERE. ACCORDING TO THE SYSTEMATIC OF
DATA AT 14 MEV /6/ THE CROSS SECTION OF THIS REACTION
IS ABOUT MAGNITUDE OF ORDER LOWER THAN OF (N,T)-REAC-
TION.
MT=107- (N,ALFA)-REACTION CROSS SECTION.IN SPITE OF THE FACT
THAT THIS REACTION IS EXOTHERMIC FOR MAIN ZN ISOTOPES
THE DATA ABOUT THIS REACTION ARE SPARSE AND CONTRA-
DICTARY. IN THE THERMAL REGION THE CROSS SECTION WAS
MEASURED ONLY FOR ZN-67: 8+-4 MICRO BARNS. FOR ZN-66
AND ZN-68 THERE ARE UPPER ESTIMATIONS NOT MORE THAN
20 MICRO BARN. FOR NATURAL ZN IT IS ADOPTED 20 MICRO-
BARN AT 0.0253 EV. THE CROSS SECTION BELOW 100 EV
FOLLOWS TO THE 1/V-LAW, ABOVE THAT IS OBTAINED EQUAL
TO ZERO. AT 14 MEV IN THE COMPILATION /2/ FOR NATU-
RAL ZN THIS CROSS SECTION IS GIVEN EQUAL TO 130 MIC-
ROBARNS WITH REFERENCE ON /7/. BUT IN THE /7/ THIS
RESULT IS ABSENT. BY THE WAY IT CONTRADICTS THE
AVAILABLE DATA ON (N,ALFA)-REACTION CROSS SECTIONS
AT 14-15 MEV THE MOST OF WHICH ARE GIVEN IN
REF./2/. SO FOR ZN-64 IN REF./2/ THE VALUE 36 MILLI-
BARN AT 14.1 MEV FROM REF./8/ IS GIVEN.IN THE REF./9/
IT IS GIVEN 6.6 MILLIBARNS AT 14.6 MEV ONLY FOR REAC-
TION WITH FORMATION NI-61 IN THE GROUND STATE. ACCOR-
DING SEMI EMPIRICAL SYSTEMATIC /10/ THE CROSS SECTION
OF (N,ALFA)-REACTION ON HEAVY ZN NUCLEI MUST BE BELOW
THAN FOR ZN-64. ABSOLUTE CROSS SECTIONS OF THIS REAC-
TION ACCORDING THE SYSTEMATIC MENTIONED FOR THE MAIN
ISOTOPES ARE: 80 MILLIBARNS FOR ZN-64, 25 MILLIBARNS
FOR ZN-66, 8 MILLIBARNS FOR ZN-68. FOR LAST ISOTOPE
THE AVERAGING OF MANY EXPERIMENTAL DATA GIVES 9+-1
MILLIBARN,THAT IS NOT BADLY AGREES WITH THE SYSTEMA-
TIC.THAT IS WHY THIS VALUE IS ACCEPTED AS A BASE FOR
THE EVALUATION OF THE (N,ALFA)-REACTION AT 14 MEV.
MF=4 ANGULAR DISTRIBUTIONS.
---------------------
MT=2 - ANGULAR DISTRIBUTION OF ELASTIC SCATTERING NEUTRONS
FOR ZN ARE ACCEPTED THE SAME AS FOR NI-64 (FOR WHICH
THOSE WERE CALCULATED USING OPTICAL MODEL).
MT=16,22,28 - FOR ALL THESE REACTIONS THE ANGULAR DISTRIBU-
TIONS ARE TAKEN ISOTROPIC IN THE LABORATORY SYSTEM.
MT=51 - THE ANGULAR DISTRIBUTIONS ARE TAKEN THE SAME AS THOSE
FOR INELASTIC SCATTERING WITH 2+ LEVEL EXCITATION OF
NI-64.
MT=91 - THE ANGULAR DISTRIBUTIONS ARE TAKEN ISOTROPIC IN THE
LABORATORY SYSTEM.
MF=5 ENERGY DISTRIBUTIONS.
--------------------
MT=16 - THE NEUTRON SPECTRA OF (N,2N)-REACTION ARE CALCULATED
BY NEVA CODE /11/.
MT=22 - NEUTRON SPECTRA OF REACTION (N,N+ALFA) ARE CALCU-
LATED BY TNG CODE.
MT=28 - NEUTRON SPECTRA OF REACTION (N,N+P) ARE CALCU-
LATED BY TNG CODE.
MT=91 - NEUTRON SPECTRA OF INELASTIC SCATTERING ARE CALCU-
LATED BY NEVA CODE /11/.
rEFERENCES.
1. NEUTRON CROSS SECTIONS V.1. NEUTRON RESONANCE PARAMETERS AND
THERMAL CROSS SECTIONS. PART A:Z=1-60. BY S.F. MUGHABGHAB,
M.DIVADEENAM AND N.E.HOLDEN. AP, 1981.
2. NEUTRON CROSS SECTIONS V.2. NEUTRON CROSS SECTIONS CURVES.
BY V.MCLANE, C.L.DUNFORD, P.F.ROSE. AP, 1989.
3. IRFAN ET AL. PROC. OF PHYS. SOC. V.81, P.808, 1963.
4. ARMSTRONG ET AL. NUCL. PHYS. V.19, P.40 (1960).
5. S.M.QAIM. NUCL. PHYS. A382, 255(1982).
6. S.M.QAIM. RADIOCHIM. ACTA, V.25, P.13 (1978).
7. BORMANN ET AL. ZEITSCHRIFT FUR PHYSIC. V.174,P.1(1963).
8. CASANOVA ET AL. ANALES DE FISICA Y QUIMICA. V.72, P.186(1976).
9. C.SPIRA AND ROBSON. NUCL. PHYS. A127, P.81 (1969).
10. GARDRER AND YU. NUCL. PHIS. V.60, P.49(1968).
11. NIKOLAEV M.N. AND GILFANOVA O. NEVA - CODE FOR CALCULATION
OF CONSEQUENTLY EVAPORATED NEUTRONS. FEI,1988,UNPUBLISHED.
12. SHIBATA K. AND FU C.Y. ORNL/TM-10093,1986.
13. NIKOLAEV M.N. PROPOSAL ON INTRODUCTION ADDITIONAL OPTION OF
DATA REPRESENTATION IN THE MF=12 FILE ENDF. PRIVATE COMMUNI-
CATION TO C.DUNFORD,1991.
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