Details and Instructions for NON-SMOKERWEB


1. Explanation


NON-SMOKERWEB is a Hauser-Feshbach statistical model code optimized for an energy and temperature range which is interesting for astrophysical purposes. It is related to the well-known SMOKER and NON-SMOKER codes.

Calculations in the statistical model require the input of a number of different nuclear properties:

Although the model is well-established, different calculations vary in the various inputs and treatments of such properties. In the calculations presented here, it was attempted to find descriptions which can be used to predict nuclear properties also for nuclei far off stability for which no experimental data is known. Therefore, it was tried to minimize the direct input of experimental data (although some parametrizations are fit to available nuclear data). Thus, we are interested in descriptions which lead to a low average deviation between predicted and observed properties. Nevertheless, local deviations of higher magnitude can occur.

Different options can be chosen as input to the statistical model calculation. The default values are those used in the calculations published in ADNDT 75 (2000) 1 and 79 (2001) 47 (except for experimental masses which have been updated since). For a more detailed explanation of the options see those papers and the reference section.

Important note: The default settings of the code make use of global inputs, attempting to include as few local information as possible. For a fair comparison to other codes be aware that many other codes include a lot of local information (such as level densities or GDR properties) for nuclei at stability. When performing such comparisons, the NON-SMOKERWEB settings should be chosen accordingly!


To run NON-SMOKERweb the user has to be registered. If you want to start a collaboration and use NON-SMOKERweb please use the Registration Form, specifying in detail what you want to use the code for. You will then be sent a username and password shortly. The access may be restricted to certain targets or projectiles and certain options.

Running NON-SMOKERweb

The HTML interface should be quite self-explanatory. In the element box, the standard abbreviation of the element should be input, as it is used in periodic systems or nuclear charts; e.g. Ne for Neon or au for Gold (input is not case sensitive). The massnumber is an integer with 2 or 3 digits.

Options and Output

The recommended set of options is the default, therefore it should be sufficient in most cases to just enter element and mass number and to select which kind of projectile one wants to use. The output will contain the nuclear reaction cross sections for three different channels (gamma, n, p, alpha) depending on which projectile was chosen. It will also contain the astrophysical reaction rates. For reactions with a neutral projectile, the Maxwellian averaged cross sections (MACS) are additionally written whereas for charged particle induced reactions the astrophysical S-factor is additionally written. For astrophysical applications it is not only necessary to know the reactions on targets in the ground state but also on thermally excited targets. The reaction rates and MACS are both given for g.s. and thermally excited targets, cross sections and S-factors only for targets being in the g.s.

Theoretical masses: By default, in the calculations experimental values are used if available (for the current status of the experimental masses included, see also the history section. The setting of the theoretical mass will affect experimentally unknown masses (separation energies), as well as the level density for all nuclei if the default level density is chosen.
The FRDM covers the widest mass range, ETFSI values are available only for A>35, and the ETFSIQ table starts at Cr (Z>23).

Hint: The output can be saved by right-clicking into the returned page and then selecting "Save as..." and the appropriate format (usually, that is text format). This yields a nice text file which can be inspected further. (For further hints, see below.)

Custom input file

Using a custom input file offers even more flexibility than the options directly provided on the web page. In order to use a file, the appropriate option on the web page has to be checked and a file location has to be provided in the appropriate field. On submission of the web form, the file will be loaded and the appropriate data used (if the file contains more than the data required by the checked options, the excess data will be ignored). For each calculation, the input file will be loaded again from the specified location. The input file is an ASCII file which contains options and data in a specific format. Invalid input files will trigger error messages.

Input file format:

Custom potential:

A speciality in this interface is the possibility to put in new functions for the optical potentials. If you are not satisfied with the provided options, you can provide a potential in the custom area. Here are some guidelines what to put into the fields: Please keep in mind that NON-SMOKERweb does not check whether the input functions actually make any sense for an optical potential. It blindly uses the computed values as real and imaginary parts of the optical potential. Unreasonable expressions may lead to unreasonable results or a crash of the code. The latter is just visible by an incomplete result page, explicit error messages are not always shown.

Applicability of the model

Please be aware that the statistical model may not be applicable below a certain energy or temperature, although values are given below that limit. The statistical model assumes that averaged transmission functions can be used, i.e. averaging over resonances in the contributing energy window is permitted. At lower excitation energy of the compound nucleus, fewer resonances will be available and thus there may be a lower energy/temperature limit for the application of the model. An estimate of the limiting energy/temperature was derived in a previous paper and is also explicitly given in ADNDT 75 (2000) 1.

The applicability limits can also be checked by calling a result from the standard result database and looking for possible applicability warning messages in the output. (See also the explanations of the database.) It has to be emphasized that very conservative assumptions are used and that the given results may be valid even below the given limit. The warning is merely issued to point out that one should be cautious and aware of the limitations.

There may be another limitation inherent to all statistical model calculations which do not explicitly include gamma cascades in the compound nucleus. Treating the cascades and the particle escape from the cascade only approximately may lead to larger errors for reactions with negative reaction Q values, i.e. for endothermic reactions. This is not necessarily the case but, in general, for these cases it is safer to calculate the reverse reaction (with positive Q value) and compute the desired reaction by applying detailed balance.

Referencing the results

When using NON-SMOKERweb and the linked pages, credit should be given to the access page, the NON-SMOKER papers, and the author. Do not forget to quote the version number you used because different versions may yield different results. The version number is given at the top of each result page returned by the web interface. The desired way of quoting would be, e.g., "...obtained with NON-SMOKER(WEB) v5.9.1w...".

I would appreciate it if a copy of the work is sent to me (e.g. at ) before publication, so that misconceptions or misinterpretations of the results can be avoided.

Please see also the disclaimer.

Error messages

There are several error messages which can be returned instead of the requested result. They should be self-explanatory. In addition to errors arising from access control or incorrect specifications in the target options, there can be fatal errors when using the customized potential option. These errors will be shown at the end of an incomplete result page and they always refer to a problem with the functions entered in the custom area. Please check your input carefully!

Bug reports

If you encounter a failure or an inexplicable result, please first check the explanation of NON-SMOKERweb and the used methods. Consult the history section for further details of the current release.

In case you still think that there might be a bug in the returned result, please send a bug report by email, specifying exactly what you did and where you see the problem.

Thomas Rauscher

2. History


This history list is being discontinued. Look in the forum for information on updates and revisions.


Migration to new server and layout change in the web pages. The function of the code should be unaffected.

01-Jun-2006 to 02-Jun-2006

Server temporarily unavailable due to scheduled power shutdown.


Version 3.3w: Minor changes and bug fixes.

09-Jul-2005 to 11-Jul-2005

Temporarily unavailable due to hardware problem!


  1. Version 3.2w: Add Coulomb radius parameter in definition of external potential.
  2. Requires new sample input files.
  3. New version of checker (Websmokertools Version 2.2) to accommodate the above change.
  4. Additional advanced option (deformation).


Version 3.1w: New advanced option and bug fix (specification of external potential).


Version 3.0w: File upload from any directory readable by the user (external file does not have to be in a WWW directory anymore). Some minor bug fixes.


Switched to HTTP POST for sending the form. That means that the result page cannot be bookmarked or linked anymore!


Version 2.01w. Some bug fixes concerning inclusion of experimental masses and custom potentials.


Version 2.0w. Update of experimental masses. Now the experimental and recommended masses from the Audi mass evaluation 2003 are used.


Version 1.1w. New options for custom input file.


Going on-line with version 1.0w!
This version also includes E2 gamma-transitions (the published standard results only use E1 and M1).
© Dr. Thomas Rauscher (email), last change 2006-Nov-16