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| Program name | Package id | Status | Status date |
|---|---|---|---|
| ALICE2011 | USCD1238/05 | Tested | 15-MAR-2011 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| USCD1238/05 | IBM PC | Linux-based PC,PC Windows |
This nuclear model code permits nuclear reaction predictions to be made using the Hybrid model of precompound decay in the HMS Monte-Carlo formulation, plus the Weisskopf-Ewing evaporation and Bohr-Wheeler fission models. The latter may be run in S-wave approximation to estimate angular momentum effects on phase space, including enhancement of gamma ray de-excitation. Multiple emission cascades including photons, n, p, d, t, 3He, and 4He are performed, plus the fission channel. Product yields may be calculated, including those of fission fragments. Single and double differential emission spectra are calculated, and user may select to have ENDF format spectra for 1-3 n, p, 4He particle emissions output. As a Monte-Carlo method of calculation is used, the history file for each event may be programmed to output any order of ENDF spectra, gated coincidence spectra, etc.
Incident projectiles of photons, neutrons, protons and heavy ions (A>1) are acceptable, as in earlier versions.
NEW VERSION DIFFERS FROM PREVIOUS VERSION IN THE FOLLOWING FEATURES
The January 2011 version of ALICE has some refinement of Fortran, more enlarged BE (Binding Energy) arrays.
The Oct 2010 version had a modification which gave the option (parm=512) to override the A=12 default mass number as the mass at or below which Fermi decay is implemented using a new coding of K.K. Gudima.
The January 2011 version (like the previous one) differs from earlier versions in allowing isotopic targets to be used except for incident heavy ions (A>1). It contains cluster exit channels on demand, precompound and compound (use PARM=128). An ENDF output for 1,2,3 n,p,alpha out reactions is an option. The logic used could be extended to include other clusters and to increase multiplicities if needed. Some routines have been rewritten in a more modern f95 Fortran compiler. Random routine generator has been rewritten.
This code predicts the course of nuclear reactions induced by photons, nucleons, or nuclei incident on target isotopes, either single mass or (for A=1 projectiles) natural isotopic mix. The nuclear models used in this process are primarily the Monte-Carlo version of the Hybrid precompound decay model followed by Weisskopf- Ewing evaporation and Bohr-Wheeler fission models. Other models are used in the algorithms for getting fission product mass and charge yields, in the nuclidic masses, fission barriers, level densities, etc. contained in the library files used at time of code execution, or coded as subroutines.
Options are available for shell corrected level densities at time of execution, or these are default selected by the code based on proximity of composite nucleus to closed shell product nuclei. Angular distributions are based on the linear momentum conservation model of Chadwick and Oblozinsky. Cluster exit channels are an option selectable by user.
Excitations below 1 GeV required, but advised to keep under 250 MeV until pion resonances are included for the excitation and decay cascades. The code is intended to be relatively fast in execution and easy to use. Ease of use is achieved by an on- screen input interrogation procedure, with defaults provided if user has no preferences, plus several library files which provide masses, binding energies, fission barriers, natural isotopic abundances of non- mono-isotopic targets, nuclide spins and parities, isomer spins and level energies ( for calculation of isomer yields).
M.Blann: Phys. Rev.C54(1996)1341.
M.B. Chadwick and P. Oblozinsky: Phys. Rev.C50, (1994)2490.
P.Moller, J.R.Nix, W.D.Myers and W.J. Swiatecki: Atomic Data Nucl. Data Tables, 59(1995)185, and private comm. P.Moller, 2002.
T.M.Shneidman et al.: Phys. Rev. C65,064302(2002).
M.Blann (LLNL, Retired),
K.K. Gudima (Institute of Applied Physics, Moldova Academy of Sciences, Kishineu, Moldova),
A.V. Ignatyuk (Institute for Physics and Power Engineering, Obninsk, Russia),
A.Yu. Konobeyev (Karlsruhe Institute of Technology, Karlsruhe, Germany),
V.P. Lunev (Institute for Physics and Power Engineering, Obninsk, Russia),
S.G. Mashnik (LANL, USA),
W.B. Wilson (LANL, USA)
We appreciate contributions from:
D. Madland (LANL,USA),
M. Giaccri-Mauborgne (CEA, Saclay, France)
Keywords: compound nuclei, evaporation model, nuclear models, precompound-nucleus emission.
