Last-modified: Mon, 25 Mar 2013 00:51:24 HADT (3841d)

Official information of BigRIPS

Official page BigRIPS

Explanations and official templates for LISE++ simulation and measured cross section are available in the official page BigRIPS Intensity

Template of LISE++ files for EURICA

Three attached files (end of this page) are template of LISE++ file for EURICA. These files are based on the templates distributed in the official web page. Template for Uranium beam on Be target includes measured cross sections at RIBF.

Blocks of Si for beta decay and its chamber-window are tentatively prepared.

Example around 78Ni (U+Be): fileEURICA238Uon9Be_78NiTemplate_v3.lpp.tgz
Example of fragmentation : fileEURICAFragmentationTemplate_v3.lpp.tgz


These are not official but for EURICA collaboration for convenience, so RIKEN doesn't guarantee its correctness. Please feedback to T. Sumikama if you find any mistakes.
Email: sumikama at_mark

Measured cross sections

Measured cross sections at RIKEN are embedded in the file. Details are written in BigRIPS.

Beam dump position

Beam dump position can be calculated using tools (Excel) BigRIPS. When you need to use the exit beam dump, you should set the position in the LISE++ simulation in order to estimate a loss by the beam dump.

Production cross section for undiscovered isotopes

Cross section is calculated by models in LISE++ code.
If you want to use cross section (cs) estimated by yourself, for example, cs of (Z,N) is roughly assumed to be one order smaller than cs of (Z,N-1), you need to input them as following.
In the LISE++ program,
1. Options>Cross sections
2. Select nucleus
3. Input cross section in mb
4. Push "Input new"
5. Close the window
6. Save LISE file

Total rate

For use of active stopper (Si), total rate is recommended to be TYPICALLY LESS THAN 100 pps. This limitation is to make a correlation between implanted ion and its beta decay. (It depends on beta-decay half life.) Radiation damage of Si detector is also important issue, but has not been well understood.

How to improve purity of in-flight fission fragment

First stage separation

1. First Dipole (D1)
Use high Brho value of D1 to reduce total yield.
In the LISE++ program,
Open window of D1 component.
Input Brho value.
Push "Calculate other optics blocks".
Calculate rate again.

2. Selection along isotone: Degrader and F2 slit
Choose degrader thickness and F2 slit