Gosia

Gosia is the primary analysis code for planning experiments and analyzing data for nuclear structure physics using [[low-energy Coulomb excitation]] experiments.  It is suited for both planning experiments and analysis of Coulomb excitation data.  The original version was written at the University of Rochester in 1979--1980 by [[Tomasz Czosnyka]], [http://www.pas.rochester.edu/~cline/  D. Cline] and [http://www.turpion.org/links/ca4ad02e0d0fafd70a31c549cf4b3c4c_0.phtml  C.Y. Wu].  T. Czosnyka maintained the code until his untimely death in 2006.  [[What_is_Gosia | Learn more...]].

==What Gosia can do for the experimenter==

===Experiment planning and simulation===

The GOSIA suite of codes are ideally suited to the design and planning of
heavy-ion induced Coulomb excitation experiments as well as the subsequent
analysis. Coulomb excitation experiments can seem deceptively simple,
especially for few-state problems, leading some experimenters to fall into 
analysis traps or collecting data that have less than optimal sensitivity to
the goals of the experiment. The [[experiment_planning | Experiment planning]] page identifies potential pitfalls
in the design and analysis of Coulomb excitation experiments. 

===Analysis of Coulomb excitation data===

[[Model_independent_analysis | Model-independent analysis]]

[[Model_dependent_analysis | Model-dependent analysis]]


==Downloads==

* The current version of the [http://www.pas.rochester.edu/~cline/Research/GOSIAcodes/2009manual20080630.pdf  Gosia manual]
* The latest release of [http://www.pas.rochester.edu/%7Ecline/Research/GOSIAcodes/gosia_20081208.10.f  Gosia](There is an extended version of Gosia for the Rachel GUI available on the [[Rachel,_a_GUI_for_Gosia  Rachel]] page.)
* The latest release of [http://www.pas.rochester.edu/%7Ecline/Research/GOSIAcodes/gosia2_20081208.11.f  Gosia2], for analysing simultaneous Coulomb excitation of target and projectile, using a common normalization.
* [http://www.pas.rochester.edu/%7Ecline/Research/GOSIAcodes/pawel-06-mod.f  Pawel], the Gosia version to treat excitation of a nucleus in an isomer state
* [http://www.pas.rochester.edu/%7Ecline/Research/GOSIAcodes/gosia_arm.for  ANNL (Anneal)], a special version of Gosia developed by Rich Ibbotson that uses simulated annealing techniques to locate minima
* [http://www.pas.rochester.edu/%7Ecline/Research/GOSIAcodes/sigma.f  Sigma], the 2006 Fortran source code for deducing the quadrupole invariants from the E2 matrix elements determined by Gosia
* [http://www.pas.rochester.edu/%7Ecline/Research/GOSIAcodes/gremlin.f  GREMLIN], the gamma-ray detector efficiency code developed for use with GOSIA in 1987 by Alexander Kavka

* The set of [http://www.pas.rochester.edu/~hayes/gosia_downloads/fit_demo_2011.tar demonstration files] to accompany the Gosia tutorial in chapter 14 of the Gosia Manual

==Installing Gosia==

Installation of Gosia requires only the following steps:

# Compiling gosia with a Fortran compiler
# Setting the default path or alias to find Gosia, if desired.  (See also the path requirements for [[Gui|Rachel]] and the [[rachel setup file]].)

Most standard Fortran 77 compilers will produce a working Gosia executable.  GNU  
<tt>g77</tt> is recommended, but is becoming deprecated on newer machines.  The newer,
more commonly used <tt>gfortran</tt> will also work.  Intel Fortran should work, but is not recommended, because future error trapping patches may not work well with the Intel compiler.  For more information about
compiling and standard builds, refer to the page [[compiling gosia | Compiling Gosia]].

== User support ==

===The graphical interface for Gosia===

A [[Gui | GUI]] (Graphical User Interface) called Rachel has been developed and is currently undergoing beta-testing.  Novice Gosia users can use this interface to develop properly formatted template Gosia input files.  These can be modified by comparing the input lines to the Gosia manual instructions, or Gosia can be run entirely from within the GUI for many typical [[simulation (experiment planning)]] and analysis problems.

Chapter 14 of the current [[Gosia Manual]] contains an annotated example input, a flowchart of the procedures that must be run during analysis of data and a tutorial based on a set of files, which can be obtained on the [[Gosia_tutorials]] page.  

===The Gosia Forum===

The new gosia forum can be found [http://www-user.pas.rochester.edu/~gosia/phpBB3/index.php here.]  As described on the [[Gosia_users'_forum]] page, the Forum is the appropriate place to post requests for help with specific Gosia calculations and for experienced users to give answers and advice.


==Maintenance of the Gosia codes==

The Gosia codes are maintained by the [[Gosia_Steering_Committee]].

==Help for the Wiki user==

Consult the page [[Wiki_formatting]] for basic formatting instructions to add to this Wiki.

==Notes==

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