Japan Charged-Particle Nuclear Reaction Data Group
Department of Physics, Faculty of Science
Hokkaido University
060-0810 Sapporo, JAPAN
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Memo CP-E/117
May 24, 2007
Distribution
OTSUKA Naohiko
Definition of spectrum averaged cross section
Date:
To:
From:
Subject:
All entries in the transmission K002 (K2021, K2022, K2023, K2024, K2025) give cross
sections averaged over Bremsstrahlung spectrum (BRA). So far no definition of BRA is given in
LEXFOR. In K002, all data with BRA are defined as follows:
Bremsstrahlung Spectrum Average: Modifier BRA
 BRA ( Emax ) 

E max
0

E max
0
n( E , Emax )   E )dE
( E / Emax ) n( E , Emax )dE
with n  
E max
0
n( E , Emax ) dE ,
where n(E, Emax) is Bremsstrahlung spectrum distribution normalized to the total number of
photon n. The denominator is the definition of total number of “equivalent quanta”, which is the
total energy divided by the maximum energy. This cross section is often given in the unit of
[barn/equivalent quantum].
I would like to know my usage (definition) of BRA is consistent with that in other centres.
Distribution:
S. Babykina, CAJaD
F.E. Chukreev, CAJaD
O. Gritzay, KINR
J. Katakura, JAEA
V.N. Manokhin, CJD
A. Nichols, NDS
A. Ohnishi, JCPRG
O. Schwerer, NDS
V. Varlamov, CDFE
V. Zerkin, NDS
A. Blokhin, CJD
S. Dunaeva, NDS
A. Hasegawa, NEA-DB
K. Katō, JCPRG
V. McLane, NNDC
C. Nordborg, NEA-DB
N. Otuka, JCPRG
S. Tákacs, ATOMKI
M. Vlasov, KINR
Y.X. Zhuang, CNDC
J.H. Chang, KAERI
S. Ganesan, BARC
H. Henriksson, NEA-DB
Y.O. Lee, KAERI
A. Mengoni NDS
P. Obložinský, NNDC
V. Pronyaev, CJD
S. Taova, VNIIEF
M. Wirtz, NDS
EXFOR, NEA-DB
M. Chiba, JCPRG
Z.G. Ge, CNDC
A. Kaltchenko, KINR
S. Maev, CJD
M. Mikhaylyukova, CJD
Y. Ohbayasi, JCPRG
D. Rochman, NNDC
T. Tárkányi, ATOMKI
H.W. Yu, CNDC