Program - Brookhaven National Laboratory

PR 109
Recent LAQGSM Developments and Benchmarking in the 1-10 GeV Energy Region
Konstantin K. Gudima, Nikolai V. Mokhov, 1 Fermi National Laboratory, Batavia, IL 60510, USA.
Stepan G. Mashnik, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
The Los Alamos version of the Quark-Gluon String Model (LAQGSM) code system, used as a default
event generator to simulate heavy-ion-induced and other high-energy nuclear reactions in the MARS15,
MCNP6, and MCNPX transport codes, has been further developed. Simulation of the hadron-hadron
inelasic interactions were substantially improved in the crucial for numerous applications, but difficult
from a theoretical standpoint, projectile energy region 1-10 GeV. Several channels have been implemented
for an explicit description: N + N → N + N + mπ, π + N → mπ (m < 5), B + B → B + Y + K,
π + N → K + Y , K + B → Y + π, π + π → K + K, and production of N − N pairs in N + N and
π + N interactions. The particle production for these channels is now based on a combination of the
phase-space and isobar models using the available experimental data for the production cross sections.
At higher energies, inelastic interactions are still simulated in the framework of the Quark-Gluon String
Model (QGSM) developed originally in Dubna and Moscow, Russia. Descriptions of pion, kaon, and strange
particle production and propagation in nuclear media are improved. Calculated with the new LAQGSM
model double differential cross sections of pions, protons, and kaons produced in interactions of protons
with various nuclei are compared with experimental data obtained by the LANL, ITEP, HARP, and ANKE
collaborations. Agreement is very good in the entire experimentally accessible phase space.
Corresponding author: Stepan G. Mashnik
PR 110
MCNP6 Study of Fragmentation Products from 112 Sn+ 112 Sn and 124 Sn+ 124 Sn at 1
GeV/nucleon
Stepan G. Mashnik, Arnold J. Sierk, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Production cross sections from 112 Sn + 112 Sn and 124 Sn + 124 Sn at 1 GeV/nucleon, measured recently at
GSI using the heavy-ion accelerator SIS18 and the Fragment Separator (FRS), have been analyzed with the
latest Los Alamos Monte Carlo transport code MCNP6 using the LAQGSM03.03 event generator. MCNP6
reproduces reasonably well all the measured cross sections. Comparison of our MCNP6 results with the
measured data and with calculations by a modification of the Los Alamos version of the Quark-Gluon
String Model allowing for multifragmentation processes in the framework of the Statistical Multifragmentation
Model (SMM) by Botvina and coauthors, as realized in the code LAQGSM03.S1, does not suggest
unambiguously any evidence of a multifragmentation signature.
PR 111
Fitting Prompt Fission Neutron Spectra Using Kalman Filter Integrated with Empire Code
G. P. A. Nobre, M. Herman, S. Hoblit, A. Palumbo, National Nuclear Data Center, Brookhaven National
Laboratory, Upton, USA. R. Capote, NAPC-Nuclear Data Section, International Atomic Energy Agency,
Vienna, Austria. A. Trkov, Joˇzef Stefan Institute, Ljubljana, Slovenia.
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