117 research outputs found
Study of three-nucleon dynamics in the dp breakup collisions using the WASA detector
An experiment to investigate the 1H(d; pp)n breakup reaction using
a deuteron beam of 300, 340, 380 and 400 MeV and the WASA detector
has been performed at the Cooler Synchrotron COSY-Jülich. As a first
step, the data collected at the beam energy of 340MeV are analysed, with a
focus on the proton–proton coincidences registered in the Forward Detector.
Elastically scattered deuterons are used for precise determination of the
luminosity. The main steps of the analysis, including energy calibration,
particle identification (PID) and efficiency studies, and their impact on the
final accuracy of the result, are discussed
Deuteron-deuteron collision at 160 MeV
The experiment was carried out using BINA detector at KVI in Groningen. For
the first time an extensive data analysis of the data collected in back part of
the detector is presented, where a clusterization method is utilized for
angular and energy information. We also present differential cross-sections for
the (dddpn) breakup reaction within \textit{dp} quasi-free
scattering limit and their comparison with first calculations based on Single
Scattering Approximation (SSA) approach.Comment: 6 pages, 4 figures, presented at Jagiellonian Symposium 2015 in
Krakow, PhD wor
Freeze-out configuration properties in the 197Au + 197Au reaction at 23 AMeV
Data from the experiment on the 197Au + 197Au reaction at 23 AMeV are
analyzed with an aim to find signatures of exotic nuclear configurations such
as toroid-shaped objects. The experimental data are compared with predictions
of the ETNA code dedicated to look for such configurations and with the QMD
model. A novel criterion of selecting events possibly resulting from the
formation of exotic freeze-out configurations, "the efficiency factor", is
tested. Comparison between experimental data and model predictions may indicate
for the formation of flat/toroidal nuclear systems
Projected Quasi-particle Perturbation theory
The BCS and/or HFB theories are extended by treating the effect of four
quasi-particle states perturbatively. The approach is tested on the pairing
hamiltonian, showing that it combines the advantage of standard perturbation
theory valid at low pairing strength and of non-perturbative approaches
breaking particle number valid at higher pairing strength. Including the
restoration of particle number, further improves the description of pairing
correlation. In the presented test, the agreement between the exact solution
and the combined perturbative + projection is almost perfect. The proposed
method scales friendly when the number of particles increases and provides a
simple alternative to other more complicated approaches
Experimental investigation of few-nucleon dynamics at medium energies
An experiment, with unpolarized deuteron beam of 160 MeV impinging on liquid hydrogen and liquid deuterium targets, was carried out using BINA detector at KVI, in Groningen, the Netherlands. Data were collected for the purpose of obtaining high precision differential cross-section for the deuteron break-up reaction. The elastic scattering data were also collected alongside. We present here the methods applied in analysis of data collected in the backward part of the detector
Determination of impact parameters in aligned breakup of projectile-like fragments in 197Au + 197Au collisions at 23AMeV
Symmetric and asymmetric aligned breakup of projectile-like fragments in 197Au + 197Au collisions at 23AMeV was studied. Independently of the asymmetry, the reaction yields have been found peaked at a common, very
narrow range of impact parameters
Competition between dynamical and sequential reaction channels in ^{197}Au+^{197}Au collisions at a bombarding energy of 23A MeV
Competition between the two reaction channels: sequential breakup and neck fragmentation has been studied in peripheral and semi-peripheral collisions of the 197 Au+ 197 Au system at bombarding energy of 23A MeV. It was found that the emission of heavy (A < 50) neck-originating fragments occurs in about 22% of ternary breakup events, making this reaction channel highly competitive with the sequential breakup of the projectile- or target-like fragment (78% of events)
Status of data analysis and preliminary results of the CHIFAR experiment
In the CHIFAR experiment, carried out at the INFN-LNS laboratory, we studied reactions between beams of Sn-124, Xe-124 and Sn-112, accelerated at 20 AMeV, and targets of Ni-64, Zn-64 and Ni-58 by using the CHIMERA multi-detector coupled to 10 telescopes of the FARCOS array. The main topics of the experiment are the competition between reaction mechanisms and the Intermediate Mass Fragment production phenomenon, aiming to extend towards the low energy regime the studies performed in previous CHIMERA experiments carried out at beam energy of 35 AMeV. Status of data analysis arid preliminary results will be presented
Investigation of the freeze-out configuration in the ^{197}Au + ^{197}Au reaction at 23 A MeV
According to the model predictions, observation of toroidal objects is expected in collisions of heavy ion at low incident energies. Comparison between experimental data and model predictions which may indicate the formation of flat/toroidal nuclear systems is shown
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