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Optical model potential parameters
(Original file name CENPL_OMP2.DAT, provided by Z. SU, 25 March 1995)
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DATA FILE OF OPTICAL MODEL PARAMETER SUB-LIBRARY (CENPL-OMP)
Nucleus-Specific Optical Model Potential Parameter Sets
Su Zongdi Sun Zhengjun Wang Chenxiang
(China Nuclear Data Centre, CIAE, P.O.BOX 275-41, Beijing 102413)
Yu Ziqiang Zuo Yixin
(Dept. of Phys., Nankai Univ.)
Ma Gonggui
(Inst. Nucl. Sci. & Tech., Sichuan Univ.)
CONTENTS
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This data file is the second part of data file of the optical model
parameter sublibrary (OMP) of the Chinese Evaluated Nuclear Parameter
Library (CENPL). The optical model potential parameter (OMPP) sets of
nucleus(or nuclei)-specific for neutron projectile only are collected and
compiled in this data file.
The relevant references are listed in omp2.dat file. At present, this data
file only contains the OMPP sets used in CENDL-1,2.
A brief information on each set of OMPP and its potential parameters are
listed. It contains target nucleus (or nuclei), neutron incident energy
region, spherical or deformed (S/D), the types of fitting experimental data
and making model calculations , deformed parameter and standard abbreviation
of reference.
A standard form of the optical model potential and relevant parameters are
given by
-U(r,E) = Vr*fr(r,rr,ar)
+i{-4*ad*Wd*[dfd(r,rd,ad)/dr]+Wg*exp[-Xg**2] + Wv*fv(r,rv,av)}
2/r*(l*s)*{Vso*[dfso(r,rso,aso)/dr + iWso*[dfso(r,r'so,a'so)/dr]}
where
Vi = Vi0 + Vi1*E+Vi2*E*E+(Vi3+Vi4*E)*(N-Z)/A, i=r, so
Wi = Wi0+Wi1*E+Wi2*E*E+(Wi3+Wi4*E)*(N-Z)/A, i=d, g,v,so
fi(r,ri,ai) = 1/[1+exp(Xi)]
Xi = (r-Ri)/ai
Ri = (ri0+ri1*E)*A**(1/3)+Ci
ai = ai0+ai1*E
i = r, g, d, v, so
FORMAT
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The first line for each set of OMPP in the file contains the following
information:
Z : the charged number of target nucleus, column 1-3.
EL : the element symbol of target nucleus, column 4-5.
A : the mass number of target nucleus, column 6-22.
For natural isotopic composition, A=0 . This set of OMPP is obtained
by fitting the experimental data of natural isotopic composition.
Energy region : in MeV, column 23-44.
Spherical or deformed(S/D) : column 45-46.
Types of fitting experimental data and making model calculations:
They include total cross section, elastic differential cross section,
non-elastic cross section, polarization, Hauser-Feshbach theory, DWBA,
coupled channel theory , and indicate by "*" in proper order in
49 -55 columns.
Deformed parameter : column 56-60.
Standard abbreviation of reference : column 61-66.
The line marked "Vr"in 7 - 10 columns contains the depth parameters of
real potential in MeV: Vr0(column 12-22),Vr1(column 23-33), Vr2(column
34-44), Vr3(column 45-55), Vr4(column 56-66),and the sign for requiring
annotation(column 67-74).
The line marked "rr" in 7 -10 columns and "ar" in 75 -78 columns contain
the geometry parameters of real potential in fm rr0(column 12-22),
rr1(column 23- 33), Cr(column 34-44), ar0(column 45-55), ar1(column 56-66),
and the sign for requiring annotation (column 67-74).
The rest may be deduced by analogy, the lines contain the data for Wd, rd,
ad ; Wg, rg, ag ; Wv, rv, av; Vso, rso, aso; Wso, r'so, a'so,
and notes for non-standard optical potential parameters.
Date:
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Time of establishment: 15 August 1994
Time of correction 25 March, 1995
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