82-Pb-207 JAEA EVAL-MAR10 O.Iwamoto, N.Iwamoto
DIST-MAY10 20100311
----JENDL-4.0 MATERIAL 8234
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
History
10-03 Resonace parameters were evaluated by N. Iwamoto.
Cross sections and spectra were evaluated and compiled by
O. Iwamoto.
MF= 1 General information
MT=451 Descriptive data and directory
MF= 2 Resonance parameters
MT=151 Resolved resonance parameters for Reich-Moore formula.
Resonance ranges: 1.0e-5 eV to 680 keV
Parameters were evaluated from the data of Mughabghab /1/
and Domingo-Pardo et al. /2/.
Effective scattering radius of 9.55 fm was selected.
Thermal cross sections and resonance integrals at 300 K
----------------------------------------------------------
0.0253 eV res. integ. (*)
(barns) (barns)
----------------------------------------------------------
Total 1.21290E+01
Elastic 1.15088E+01
n,gamma 6.20139E-01 3.57497E-01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
MF= 3 Neutron cross sections
MT= 1 Total cross section
Based on experimental data/3/ and CCONE calculation.
MT= 2 Elastic scattering cross section
Obtained by subtracting non-elastic cross sections from total
cross sections.
MT= 4,51-91 (n,n') cross section
Calculated with CCONE code /4/.
MT= 16 (n,2n) cross section
Calculated with CCONE code /4/.
MT= 17 (n,3n) cross section
Calculated with CCONE code /4/.
MT= 22 (n,na) cross section
Calculated with CCONE code /4/.
MT= 28 (n,np) cross section
Calculated with CCONE code /4/.
MT=102 Capture cross section
Calculated with CCONE code /4/.
MT=103 (n,p) cross section
Calculated with CCONE code /4/.
MT=107 (n,a) cross section
The (n,a) cross section below 680 keV was calculated from
resonance parameters, by assuming a mean alpha width of
1.0e-5 eV and 5.0e-7 (above 550keV) for s-wave resonances
and 5.0e-7 eV for p- and d-wave resonances.
The cross section was averaged in suitable energy intervals.
Above 680 keV, the cross section was connected smoothly to the
CCONE calculation.
MF= 4 Angular distributions of emitted neutrons
MT= 2 Elastic scattering
Calculated with CCONE code /4/.
MF= 6 Energy-angle distributions of emitted particles
MT= 16 (n,2n) reaction
Neutron spectra calculated with CCONE code/4/.
MT= 17 (n,3n) reaction
Neutron spectra calculated with CCONE code/4/.
MT= 22 (n,na) reaction
Neutron spectra calculated with CCONE code/4/.
MT= 28 (n,np) reaction
Neutron spectra calculated with CCONE code/4/.
MT= 51-91 (n,n') reaction
Neutron angular distributions and spectra calculated with
CCONE code/4/.
MT= 102 Capture cross section
Gamma-ray spectra calculated with CCONE code/4/.
*****************************************************************
* Nuclear Model Calculation with CCONE code /4/ *
*****************************************************************
Models and parameters used in the CCONE calculation
1) Optical model
neutron OMP: Koning et al./5/
proton OMP: Koning and Delaroche /6/
alpha OMP: Avrigeanu et al./7/ with modification
2) Two-component exciton model/8/
* Global parametrization of Koning-Duijvestijn/9/
was used.
* Gamma emission channel/10/ was added to simulate direct
and semi-direct capture reaction.
3) Hauser-Feshbach statistical model
* Moldauer width fluctuation correction/11/ was included.
* Neutron, proton, alpha and gamma decay channels were
included.
* Transmission coefficients of neutrons, proton and alpha
were taken from optical model calculation.
* The level scheme of the target is shown in Table 1.
* Level density formula of constant temperature and Fermi-gas
model were used with shell energy correction and collective
enhancement factor. Parameters are shown in Table 2.
* Gamma-ray strength function of Kopecky et al/12/,/13/
was used. The prameters are shown in Table 3.
------------------------------------------------------------------
Tables
------------------------------------------------------------------
Table 1. Level Scheme of Pb-207
-------------------
No. Ex(MeV) J PI
-------------------
0 0.00000 1/2 -
1 0.56970 5/2 -
2 0.89780 3/2 -
3 1.63337 13/2 +
4 2.33995 7/2 -
5 2.62350 5/2 +
6 2.66240 7/2 +
7 2.70200 9/2 +
8 2.72700 9/2 +
-------------------
Table 2. Level density parameters
--------------------------------------------------------
Nuclide a* Pair Eshell T E0 Ematch
1/MeV MeV MeV MeV MeV MeV
--------------------------------------------------------
Pb-208 26.5095 1.6641 -9.9611 0.6945 1.6735 8.9801
Pb-207 25.6831 0.8341 -9.5535 0.7157 0.5055 8.8352
Pb-206 26.2968 1.6722 -8.3925 0.7059 0.4426 10.1593
Pb-205 26.1904 0.8381 -7.5629 0.6715 -0.4353 8.0994
Tl-207 24.0029 0.8341 -9.1989 0.6784 1.0665 6.0451
Tl-206 23.9062 0.0000 -9.0786 0.7703 -0.8614 9.5127
Tl-205 23.8095 0.8381 -7.9177 0.7491 -0.5502 9.6384
Hg-206 23.9062 1.6722 -8.0262 0.6306 1.6426 6.0277
Hg-205 23.8095 0.8381 -7.7955 0.6870 0.1648 7.1525
Hg-204 23.7127 1.6803 -7.2319 0.7544 -0.2408 10.8925
Hg-203 23.6158 0.8422 -6.5295 0.7165 -0.9421 8.7294
Hg-202 23.5189 1.6886 -5.9276 0.7363 -0.7512 10.4860
Hg-201 23.4219 0.8464 -5.2630 0.6922 -1.2829 8.2740
--------------------------------------------------------
Table 3. Gamma-ray strength function for Pb-208
--------------------------------------------------------
* E1: ER = 13.49 (MeV) EG = 4.40 (MeV) SIG = 621.80 (mb)
* M1: ER = 6.92 (MeV) EG = 4.00 (MeV) SIG = 1.41 (mb)
* E2: ER = 10.63 (MeV) EG = 3.61 (MeV) SIG = 5.33 (mb)
--------------------------------------------------------
References
1) S.F.Mughabghab: "Atlas of Neutron Resonances, Fifth
Edition: Resonance Parameters and Thermal Cross Sections.
Z=1-100", Elsevier Science (2006).
2) C.Domingo-Pardo et al.: Phys. Rev. C74, 055802 (2006).
3) D.J.Horen et al.: Phys. Rev. C18, 722 (1978).
4) O.Iwamoto: J. Nucl. Sci. Technol., 44, 687 (2007).
5) A.J.Koning et al.: Nucl. Sci. Eng., 156, 357 (2007).
6) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003).
7) V.Avrigeanu,P.E.Hodgson, and M.Avrigeanu, Report OUNP-94-02
(1994), Phys. Rev. C49,2136 (1994).
8) C.Kalbach: Phys. Rev. C33, 818 (1986).
9) A.J.Koning, M.C.Duijvestijn: Nucl. Phys. A744, 15 (2004).
10) J.M.Akkermans, H.Gruppelaar: Phys. Lett. 157B, 95 (1985).
11) P.A.Moldauer: Nucl. Phys. A344, 185 (1980).
12) J.Kopecky, M.Uhl: Phys. Rev. C41, 1941 (1990).
13) J.Kopecky, M.Uhl, R.E.Chrien: Phys. Rev. C47, 312 (1990).