Sökning: "nuclear fragmentation"

Visar resultat 1 - 5 av 62 avhandlingar innehållade orden nuclear fragmentation.

1. 1. Ions colliding with molecules and molecular clusters : fragmentation and growth processes

   Författare :Tao Chen; Henrik Cederquist; Hutton Roger; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; PAH; H2; C60; fragmentation; fysik; Physics;

   Sammanfattning : In this work we will discuss fragmentation and molecular growth processes in collisions of Polycyclic Aromatic Hydrocarbon (PAH) molecules, fullerenes, or their clusters with atoms or atomic ions. Simple collision models as well as molecular structure calculations are used to aid the interpretations of the present and other experimental results. LÄS MER

3. 2. Spectroscopic Studies of Isomers Produced in Relativistic Projectile Fragmentation and In-Flight Fission

   Författare :Milena Mineva; Kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Projectile fragmentation; nuclear structure; isomeric states; lifetimes; production rates; Kärnfysik; isomeric ratios; Nuclear physics; Fysicumarkivet A:000; in-flight fission;

   Sammanfattning : This thesis is based on a number of experiments performed at the FRagment Separator (FRS) at the Gesellschaft für Schwerionenforschung mbH (GSI) in Darmstadt, Germany, in which heavy-ion reactions at relativistic energies have been used to produce nuclei far from stability. In April 1999 projectile fragmentation of 208Pb at 1 GeV/nucleon was used to study so called K-isomers in the neutron-rich isotopes of Lu (Z=71) to Hg (Z=80). LÄS MER

4. 3. Fragmentation cross sections: measurement, systematics and model developement

   Författare :Chiara La Tessa; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; projectile total charge-changing cross sections; weak factorization; strong factorization; projectile partial charge-changing cross sections; heavy-ions; space radioprotection; nuclear fragmentation;

   Sammanfattning : Man's attitude towards space exploration has been mainly limited by the health risk related to the exposure to the space radiation environment. Some components of the space field can be characterized by such a high flux to kill a man if directly exposed and in general, all space radiation constitutes a hazard for astronauts engaged in long-term missions. LÄS MER

5. 4. Mini-Jet Production in Proton-Antiproton Interactions and Particle Production in Heavy-Ion Collisions

   Författare :Haiqiao Wang; Partikel- och kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; proton antiproton interaction; Quark-gluon plasma; dynamical fluctuation; intermittency; limiting fragmentation; intranuclear cascading; target fragmentation; heavy-ion collision; image processing; mini-jet; Nuclear physics; Kärnfysik; Fysicumarkivet A:1997:Wang;

   Sammanfattning : The thesis is based on the data analysis and detector development of the EMU01/CERN, E863/BNL and UA1/CERN experiments. Particle fluctuations are studied with the scaled factorial moments in the fragmentation region of oxygen-induced emulsion interactions from 3.7 to 200 A GeV. LÄS MER

7. 5. Fragmentation in Proton-Nucleus Reactions from 100 to 1400 MeV

   Författare :Henrik Jäderström; Lars Wesretberg; Yuri Murin; Kjell Aleklett; Haik Simon; Uppsala universitet; []
   Nyckelord :Nuclear physics; proton; deuteron; 20Ne; 28Si; Xe; nuclear reactions; inverse kinematics; recoils; intermediate mass fragments; angular distribution; DCM model; JQMD model; CFEM model; single event upset; Kärnfysik;

   Sammanfattning : The heaviest fragments, recoils, have been studied in proton and deuteron induced 28Si reactions and proton-20Ne reactions at 100-300 MeV per nucleon. Inclusive charge and angular distributions and coincidences between He nuclei and recoils have been compared to two theoretical models, Dubna Cascade Model and JAERI Quantum Molecular Dynamics. LÄS MER