1,549 research outputs found
Hot fragmentation of nuclei
Today, we have a variety of reactions at hand that can be used to
multi-fragment nuclei. In many of these reactions even several sources of
fragments can be discerned and characterized.
There is overwhelming evidence that these sources of fragments are hot. It is
already less clear whether heat by itself is sufficient to initiate the
fragment decay. What causes fragmentation, and when and how are the fragments
(pre)formed? These questions have remained as much a challenge as the
complementary class of questions to which they are related: What observations
derive their significance from the liquid-gas phase behavior of extended
nuclear matter? And, can we observe a phase transition in finite nuclei?
Recent developments, largely coming from complex analyses of data sets
measured in 4-pi-type experiments as well as from calculations based on
advanced theoretical concepts, will be discussed.Comment: 13 pages, with 8 included figures; To appear in the proceedings of
the NN 2000 conference; Also available from
http://www-kp3.gsi.de/www/kp3/aladin_publications.htm
Thermodynamic Variables from Spectator Decay
New results for the masses, excitation energies, temperatures, and densities
of excited spectator systems at breakup are presented. They were obtained in
two recent experiments with the ALADIN spectrometer at SIS in which reactions
of Au-197 on Au-197 in the regime of relativistic energies up to 1 GeV per
nucleon were studied. The methods used to extract these thermodynamic variables
are discussed.Comment: 17 pages, TeX with 10 included figures; To appear in the proceedings
of the 14th Winter Workshop on Nuclear Dynamics, Snowbird, Utah, January 31 -
February 7, 1998; also available from
http://www-kp3.gsi.de/www/kp3/aladin_publications.htm
Collective flow in heavy ion collisions at intermediate energies
We present results of a flow analysis for the set of reactions of 124,129Xe
projectiles and 112,124Sn targets at incident energies 100 and 150 A MeV
studied with the INDRA detector at GSI. The dependence on centrality and on p_t
of the directed and elliptic flow are determined for isotopically selected
reaction products with Z \le 3. The flow parameters v_1 and v_2, in general,
follow expected trends but isotopic effects are small.Comment: 3 pages, 2 figures, contributed talk at INPC, Tokyo, June 3-8, 2007,
to appear in the proceeding
- …