72-Hf-174
72-HF-174 NAIG+ EVAL-JUL89 HIDA, YOSHIDA AND SHIBATA(JAERI)
DIST-MAR02 REV3-APR01 20010417
----JENDL-3.3 MATERIAL 7225
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
89-07 New evaluation for JENDL-3 was made by K.Hida, T.Yoshida
(naig) and K.Shibata (jaeri).
94-01 JENDL-3.2.
Compiled by T.Nakagawa (ndc/jaeri)
***** modified parts for JENDL-3.2 ********************
(3,2), (3,4), (3,51), (3,52), (3,55-63), (3,65-68)
Curves of inelastic scattering cross sections
were smoothed by adding interpolated values at
several energy points.
***********************************************************
01-04 JENDL-3.3
Compiled by K.Shibata (ndc/jaeri)
***** modified parts for JENDL-3.3 ********************
(1,451) Updated.
(3,1) Mesured data were considered between 110 keV
and 7.5 MeV.
(3,2) Re-calculated.
(3,251) Deleted.
(4,2) Transformation matrix deleted.
(5,16-91) INT=22
***********************************************************
mf=1 General information
mt=451 Descriptive data and dictionary
mf=2 Resonance parameters
mt=151 Resolved and unresolved resonance parameters
Resolved resonances for MLBW formula
Energy range : 1.0e-5 eV to 220 eV.
Res. energies and gam-n : BNL-325 /1/.
Gam-gamma : 0.060 eV assumed if unknown.
Radius : 7.5 fm
Unresolved resonances
Energy range : 220 eV to 50 keV.
s0, s1, r and gam-gamma : Adjusted so that the calculated
total and capture cross sections
were reproduced well.
Results are d-obs = 13.4 eV, s0 = 2.8e-4, s1 = 1.00e-4,
r = 7.9 fm and gam-gamma = 0.054 eV.
2200 m/sec cross sections and calculated res. integrals.
2200 m/sec res. integ.
total 576.4 b -
elastic 15.0 b -
capture 561.5 b 363.1 b
mf=3 Neutron cross sections
Below 50 keV :
No background was given.
Above 50 keV :
mt=1,2,4,51-68,91,102 Total,elastic,inelastic and capture
Calculated with ecis /2/ and casthy /3/. Deformed optical
potential for ecis calculation was determined so as to reproduce
the experimental total cross section of natural hafnium,
starting with the Haouat potential /4/.
V0 = 47.05-0.3*En, Ws = 3.92+0.4*En (En<10), Vso = 6.2 (MeV),
7.92 (En>10)
a0 = 0.63, as = 0.52, aso = 0.47 (fm),
r0 = 1.24, rs = 1.24, rso = 1.12 (fm),
beta-2 = 0.266, beta-4 = 0.0.
The deformation parameter beta-2 was determined from the
measured e2 transition probability data /5/. The lowest three
levels belonging to the ground state rotational band were
coupled in the calculation. The spherical optical potential for
casthy calculation is the same as that of JENDL-2.
V0 = 38.0, Ws = 8.0+0.5*sqrt(En), vso = 7.0 (MeV),
a0 = 0.47, as = 0.52 , aso = 0.47 (fm),
r0 = 1.32, rs = 1.32 , rso = 1.32 (fm).
Competing processes (n,2n) and (n,3n) were calculated with gnash
/6/ and fed to ecis-casthy calculation. The level fluctuation
and interference effects were considered. Level scheme was
taken from table of isotopes /7/.
no. energy(MeV) spin-parity
g.s. 0.0 0 +
1 0.0910 2 +
2 0.2975 4 +
3 0.6084 6 +
4 0.8282 0 +
5 0.9002 2 +
6 1.0622 4 +
7 1.2268 2 +
8 1.3034 3 +
9 1.3087 2 -
10 1.3194 2 +
11 1.3365 3 +
12 1.3947 4 +
13 1.4253 4 -
14 1.4429 5 -
15 1.4489 4 +
16 1.4964 2 +
17 1.5034 3 +
18 1.6261 4 +
Continuum levels assumed above 1.6487 MeV.
The level density parameters for Gilbert and Cameron's formula
/8/ are the same as those of JENDL-2.
a(1/MeV) c(1/MeV) t(MeV) Ex(MeV) sigma**2
hf-174 23.09 2.31 0.477 5.01 7.47
hf-175 22.93 10.0 0.484 4.42 6.00
*** modification for JENDL-3.3 ********************************
For mt=1, measured data /9,10,11/ on natural element were
considered in the energy region from 110 keV to 7.5 MeV.
****************************************************************
mt=16,17 (n,2n), (n,3n)
Calculated with gnash /6/. The transmission coefficients for
the incident channel were generated with ecis /4/, while those
for the exit channels with eliese-3 /12/. The preequilibrium
parameter f2 was adjusted to reproduce the measured (n,2n) cross
section at 14.5 MeV and resulted in f2=5.0.
mf=4 Angular distributions of secondary neutrons
mt=2,51-68,91
Calculated with ecis /2/ and casthy /3/.
mt=16,17
Isotropic in the laboratory system.
mf=5 Energy distributions of secondary neutrons
mt=16,17,91
Calculated with gnash /6/.
mf=12 Photon multiplicities and transition probabilities
mt=16,17,91,102
Calculated with gnash /6/ and stored under option-1 (photon
production multiplicities). The photon strength functions for
most nuclei were taken from /1/, while those for some hafnium
isotopes were determined from capture cross section normaliza-
tion to the experimental data. The photon profile function is a
superposition of the berman-type giant dipole resonance /13/
and the pygmy resonance whose parameter values were cited from
the neighbouring nucleus Ta /14/.
eg1 = 15.23, eg2 = 12.3 , ep = 5.2 (MeV),
gg1 = 4.48, gg2 = 2.43, gp = 2.5 (MeV),
sig-pygmy/sig-gdr = 0.0245.
mt=51-68
Stored under option-2 (transition probability array). Data were
taken from /7/.
mf=14 Photon angular distributions
mt=16,17,51-68,91,102
Isotropic.
mf=15 Continuous photon energy spectra
mt=16,17,91,102
Calculated with gnash /6/.
References
1) Mughabghab S.F.: Neutron cross sections, Vol.1, Part B (1984).
2) Raynal J.: IAEA SMR-9/8 (1970).
3) Igarasi S. and Fukahori T.: JAERI 1321 (1991).
4) Haouat G. et al.: Nucl. Sci. Eng., 81, 491 (1982).
5) Raman S. et al.: At. Data Nucl. Data Tables, 36, 1 (1987).
6) Young P.G. and Arthur E.D.: LA-6947 (1977).
7) Lederer C.M. and Shirley V.S.: Table of isotopes 7th edition
(1979).
8) Gilbert A. and Cameron A.G.W.: Can. J. Phys., 43, 1446 (1965).
9) Sherwood G.L. et al.: Nucl. Sci. Eng., 39, 67 (1970).
10) Foster,Jr. D.G. and Glasgow D.W.: Phys. Rev., C3, 576 (1971).
11) Poenitz W.P. and Whalen J.F.: ANL/NDM-80 (1983).
12) Igarasi S.: JAERI-1224 (1972).
13) Berman B.L.: At. Data Nucl. Data Tables, 15, 319 (1975).
14) Igashira M. et al.: Int. Symp. Capture Gamma-ray Specroscopy
and Related Topics - 1984, 523 (1985).