|Message: Discrepancies between cascade model results in Geant4 10.2 and 10.3||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
a simulation of 480 MeV protons on uranium using the Liege cascade (QGSP_INCLXX) in combination with the ABLA V3 produced a peculiar cluster of extremely neutron-rich isotopes (see attached figure) in the latest Geant4 10.3 version.
It doesn't show up using the same code in 10.2. The same effect is observed with the Bertini cascade (QGSP_BERT_HP).
Production cross-sections are as high as 0.4 mbarn for Lu-194, for example. That's 3 orders of magnitude higher the most neutron-rich isotopes (about 15 neutrons less than Lu-194) which can realistically be produced by fragmentation.
I wonder if someone can tell me if this result is based on some new reaction cross-section data or just a bug.