CoH 3 : The Coupled-Channels and
Hauser-Feshbach Code
Toshihiko Kawano
1 Introduction
The statistical Hauser-Feshbach (HF) codes with width fluctuation correction are the
main tool for calculating compound nuclear reactions when an individual resonance
structure no longer persists. Typically this situation is satisfied when a nucleon or
a light charged particle having more than a few hundred keV energy interacts with
a medium to heavy (A > 20) target. These codes provide complete information of
nuclear reactions, not only the reaction cross sections but also the energy and angular
distributions of secondary particles, γ -ray production cross sections, isomeric state
productions, and so on.
In the 1990s, the Los Alamos HF code, GNASH [1], was widely utilized to
calculate nuclear reaction cross sections, together with an optical model code such
as ECIS or ELIESE-3 [2] for generating the particle transmission coefficients.
Although GNASH is a powerful code to study nuclear reaction mechanisms,
the mainframe-age technology makes upgrading and maintaining the source code
extremely difficult. Under such the circumstances, development of a new optical
and HF code, CoH, began at Kyushu University. Originally it was written in C, and
later whole the source code was rewritten in C++. The most recent version, CoH 3 ,
possesses more functionality than GNASH, and it is fully capable for calculating
various nuclear reactions.
T. Kawano ()
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, USA
e-mail: kawano@lanl.gov
© This is a U.S. government work and not under copyright protection
in the U.S.; foreign copyright protection may apply 2021
J. Escher et al. (eds.), Compound-Nuclear Reactions, Springer Proceedings in
Physics 254, https://doi.org/10.1007/978-3-030-58082-7_3
27
Hauser-Feshbach Code
Toshihiko Kawano
1 Introduction
The statistical Hauser-Feshbach (HF) codes with width fluctuation correction are the
main tool for calculating compound nuclear reactions when an individual resonance
structure no longer persists. Typically this situation is satisfied when a nucleon or
a light charged particle having more than a few hundred keV energy interacts with
a medium to heavy (A > 20) target. These codes provide complete information of
nuclear reactions, not only the reaction cross sections but also the energy and angular
distributions of secondary particles, γ -ray production cross sections, isomeric state
productions, and so on.
In the 1990s, the Los Alamos HF code, GNASH [1], was widely utilized to
calculate nuclear reaction cross sections, together with an optical model code such
as ECIS or ELIESE-3 [2] for generating the particle transmission coefficients.
Although GNASH is a powerful code to study nuclear reaction mechanisms,
the mainframe-age technology makes upgrading and maintaining the source code
extremely difficult. Under such the circumstances, development of a new optical
and HF code, CoH, began at Kyushu University. Originally it was written in C, and
later whole the source code was rewritten in C++. The most recent version, CoH 3 ,
possesses more functionality than GNASH, and it is fully capable for calculating
various nuclear reactions.
T. Kawano ()
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, USA
e-mail: kawano@lanl.gov
© This is a U.S. government work and not under copyright protection
in the U.S.; foreign copyright protection may apply 2021
J. Escher et al. (eds.), Compound-Nuclear Reactions, Springer Proceedings in
Physics 254, https://doi.org/10.1007/978-3-030-58082-7_3
27