23 research outputs found
Semi-classical, microscopic approach to the liquid drop model - a possible way of the description of heavy ion reaction
An isospin and spin dependent form of the equation of state for nuclear
matter is presented. This form is used for the description of nucleon
interaction in a new dynamic model. Preliminary calculations show that the new
approach makes possible predicting the alpha structures appearing in the case
of the ground state even-even nuclei.Comment: 23 pages, 9 figure
Alpha Cluster Model of Atomic Nuclei
Description of a nuclear system in its ground state and at low excitations
based on the equation of state (EoS) around normal density is presented. In the
expansion of the EoS around the saturation point additional spin polarization
terms are taken into account. These terms, together with the standard symmetry
term, are responsible for appearance of the -like clusters in the
ground state configurations of the N=Z even-even nuclei. At the nuclear surface
these clusters can be identified as alpha particles. A correction for the
surface effects is introduced for atomic nuclei. Taking into account an
additional interaction between clusters the binding energies and sizes of the
considered nuclei are very accurately described. The limits of the EoS
parameters are established from the properties of the , He and
particles.Comment: 27 pages, 10 figure
Alpha clustering in nucleus
The nuclear structure, as we know now, is a roughly homogeneous distribution of neutrons and protons. However, the clustering phenomena is important to determine the structure of light nuclei. Here, we present the semi-classical microscopic approach to the Liquid Drop Model and the emergence of alpha clusters as a result of spin–isospin pairing of nucleons in the variational energy minimization procedure
Dissipative orbiting in ^{136}Xe+^{209}Bi reactions at 28 and 62 AMeV
Correlations between the energy, charge and the deflection angle of the projectile-like fragments were studied for the ^{136}Xe + ^{209}Bi reaction at E∕A = 28 and 62 MeV. These correlations are seen to exhibit features characteristic of dissipative orbiting, commonly found at bombarding energies of a few MeV/nucleon above the interaction barrier, but also reported in the Fermi-energy domain. It was found, that in the studied bombarding energy range, the reaction cross section is still dominated by the dissipative binary reactions of well defined projectile- and target-like fragments
KATANA : a charge-sensitive trigger/veto array for the RIT TPC
KATANA — the Krak´ow Array for Triggering with Amplitude discrimiNAtion, has been built and used as a trigger and veto detector for the SπRIT TPC at RIKEN. Its construction allows operating in magnetic field, providing fast response for ionizing particles and giving the approximate multiplicity and charge information on forward emitted reaction products. Depending on this information, trigger and veto signals are generated. Multi-Pixel Photon Counters were used as light sensors for plastic scintillators. Custom designed front-end and peripheral electronics will be presented as well
KATANA : a charge-sensitive triggering/veto system for the SRIT experiment
KATANA — the Kraków Array for Triggering with Amplitude discrimiNAtion, has been built and used as a trigger and Veto detector for the SRIT TPC at RIKEN. Its construction allows for operation in magnetic field and provides a fast response for ionizing particles giving the approximate forward multiplicity and charge information. Depending on this information, trigger and veto signals are generated. The Multi-Pixel Photon Counters were used as light sensors for plastic scintillators. Performance of the detector is presented
A novel experimental setup for rare events selection and its potential application to super-heavy elements search
The paper presents a novel instrumentation for rare events selection which was tested in our research of short-lived super-heavy elements production and detection. The instrumentation includes an active catcher multi-elements system and dedicated electronics. The active catcher located in the forward hemisphere is composed of 63 scintillator detection modules. Reaction products of damped collisions between heavy-ion projectiles and heavy-target nuclei are implanted in the fast plastic scintillators of the active catcher modules. The acquisition system trigger delivered by logical branch of the electronics allows to record the reaction products which decay via the alpha-particle emissions or spontaneous fission which take place between beam bursts. One microsecond wave form signal from FADCs contains information on heavy implanted nucleus as well as its decays
KRATTA, a triple telescope array for charged reaction products
KRATTA, a new, low threshold, broad energy range triple telescope array has been built to measure the energy, emission angles and isotopic composition of light charged reaction products. It has been equipped with fully digital chains of electronics. The array performed very well during the ASY-EOS experiment, conducted in May 2011 at GSI. The structure and performance of the array are presented using the first experimental results
Experimental search for super and hyper heavy nuclei at cyclotron Institute Texas A&M University
The question "How heavy can an atomic nucleus be?" is a fundamental problem in nuclear physics. The possible existence of island(s) of stable super-heavy nuclei has been an inspiring problem in heavy ion physics for almost four decades. This paper is focused on the experimental search of Super/Hyper Heavy Elements (SHE/HHE) conducted at the Cyclotron Institute, Texas A&M University. A novel experimental idea and experimental set up introduced for this research will be presented
NEW EXPERIMENTAL APPROACH FOR HEAVY AND SUPERHEAVY ELEMENT PRODUCTION
In this article we present a new experimental approach for production of heavy and superheavy elements (HE, SHE). Nuclear reactions at low incident energies induced by heavy ion (HI) projectiles on fissile target nuclei are investigated. Dedicated detection setup is presented and the preliminary results for the reaction 197Au(7.5 MeV /u) + 232Th, studied at the Cyclotron Institute of Texas A&M University, are given