552 research outputs found
Role of phi decays for K- yields in relativistic heavy-ion collisions
The production of strange mesons in collisions of Ar+KCl at a kinetic beam
energy of 1.756 AGeV is studied within a transport model of
Boltzmann-\"Uhling-Uhlenbeck (BUU) type. In particular, and
yields and spectra are compared to the data mesured recently by the HADES
collaboration and the yield measured previously by the FOPI
collaboration. Our results are in agreement with these data thus presenting an
interpretation of the subleading role of decays into 's and
confirming the importance of the strangeness-exchange channels for
production.Comment: 24 pages, 19 figure
Gender, Entrepreneurship and Minority Groups Surinamese Women in the Netherlands
Aim of the Project:
(a) To study the experiences and best practices of successful women entrepreneurs from the Surinamese community
(b) To examine the methods these women used to develop their enterprises, the challenges they faced and how they coped with them
(c) To identify key practices that have helped them in their entrepreneurial activity
(d) To suggest ways in which the local government could support such ventures.
(e) To disseminate the outcomes of the study in Suriname to encourage entrepreneurial development for women in the country.
This is a pilot study, which is both exploratory and informative. It reflects on the innovativeness of these women and the lessons that can be learnt from their experiences. It also serves as a basis for further research and appropriate policy development in the field of migrant entrepreneurship and women
phi puzzle in heavy-ion collisions at 2 AGeV: how many K-from phi decays?
The preliminary experimental data on production in the reaction
Ni(1.93 AGeV) + Ni point to a puzzling high yield which can not be
reproduced with present transport codes. We survey the experimental situation
and present prospects for dedicated measurements of the multiplicities
with the and channels at HADES and FOPI.Comment: talk at Strange Quarks in Matter 2001, Frankfurt Sep. 24 - 29, 200
Simple analytic solution of fireball hydrodynamics
A new family of simple analytic solutions of hydrodynamics is found for
non-relativistic, rotationally symmetric fireballs assuming an ideal gas
equation of state. The solution features linear flow profile and a non-trivial
transverse temperature profile. The radial temperature gradient vanishes only
in the collisionless gas limit. The Zimanyi-Bondorf-Garpman solution and the
Buda-Lund parameterization of expanding hydrodynamical sources are recovered as
special cases. The results are applied to predict new features of proton-proton
correlations and spectra data at 1.93 AGeV Ni + Ni reactions.Comment: Latex, Revte
Correlations and Characterization of Emitting Sources
Dynamical and thermal characterizations of excited nuclear systems produced
during the collisions between two heavy ions at intermediate incident energies
are presented by means of a review of experimental and theoretical work
performed in the last two decades. Intensity interferometry, applied to both
charged particles (light particles and intermediate mass fragments) and to
uncharged radiation (gamma rays and neutrons) has provided relevant information
about the space-time properties of nuclear reactions. The volume, lifetime,
density and relative chronology of particle emission from decaying nuclear
sources has been extensively explored and has provided valuable information
about the dynamics of heavy-ion collisions. Similar correlation techniques
applied to coincidences between light particles and complex fragments are also
presented as a tool to determine the internal excitation energy of excited
primary fragments as it appears in secondary-decay phenomena.Comment: To appear on Euorpean Physics Journal A as part of the Topical Volume
"Dynamics and Thermodynamics with Nuclear Degrees of Freedom
Die Wertbaumanalyse : Entscheidungshilfe für die Politik
For an assessment of the social compatibility of energy systems, it is jmportant to know the criteria by which different social groups evaluate energy systems and thereby identify energy supply seenarios which are more or less desirable with respect to these criteria. The study presented in this volume is an attempt to develop such a catalogue of criteria. Using a technique called "value tree analysis" , a logical system of catagorizing values, concerns and criteria for the evaluation of energy systems was created. This is first clone separately for each important social groups and then jointly in an aggregate system that combines the values and concerns voiced by these groups
Lambda-proton correlations in relativistic heavy ion collisions
The prospect of using lambda-proton correlations to extract source sizes in
relativistic heavy ion collisions is investigated. It is found that the strong
interaction induces a large peak in the correlation function that provides more
sensitive source size measurements than two-proton correlations under some
circumstances. The prospect of using lambda-proton correlations to measure the
time lag between lambda and proton emissions is also studied.Comment: 4 pages, 3 figure, revtex style. Two short paragraphs are added at
referees' recommendations. Phys. Rev. Lett. in pres
Production of phi mesons in subthreshold heavy-ion collisions
Within a BUU type transport model we study meson production in
subthreshold Ni+Ni and Ru+Ru reactions. For the first time we included in our
model the elementary reaction channels , and . In spite of a substantial increase of
the multiplicities by these channels our results stay significantly
below the preliminary experimental data.Comment: 4 pages, 2 figures, version to be published in the proceedings of the
SQM2001 Conference (Frankfurt, Germany, 25-29 Sep 2001
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