Texas Active Target detector system (TexAT) is designed for nuclear structure, nuclear reactions and nuclear astrophysics studies with rare isotope beams. It consist of a planar time projection chamber (TPC) that is based on the microMegas technology. The TPC is complemented by the Silicon detectors shell and the CsI(Tl) detectors shell. The readout is based on GET electronics. Data analysis...
The SpecMAT project aims at using nucleon-transfer reactions to study crucial regions of the chart of nuclei, to understand the features of the underlying forces that drive shell evolution. Initially, we will focus on the neutron-rich nuclei around nickel (Z=28) and, for the first time, the neutron-deficient nuclei around lead (Z=82). SpecMAT is an active-target detector that combines high...
I will introduce the active targets CAT-S and CAT-M for missing mass spectroscopy with high-intensity beams and their physics programs. Both active targets are based on GEM-TPC coupled with silicon detectors and designed to be used in combination with high-intensity medium-heavy nuclei beams more than 500-kcps. The first experiment at RIBF with CAT-S and the commissioning of CAT-M at HIMAC...
This work addresses the first inverse-kinematics fission measurements in a gaseous active target [1]. A 238U beam was sent into the MAYA active target, where fusion and transfer-induced fission reactions occured with 12C nuclei of the gas filling the detection volume. A telescope of Si detectors was included in the setup to measure the target-like transfer partner and identify the fissioning...
Fission barrier height is one of the least known nuclear parameters, with experimental data, acquired decades ago, existing only close to the line of beta-stability. Availability of heavy radioactive beam offers possibility to investigate their transfer-induced fission and thus probe their fission barriers. We will provide a brief summary of present status of the topic and then concentrate on...
Alpha cluster structures have been widely examined in self conjugate A=4n nuclei. With the recent developments of new accelerator facilities, studies on neutron/proton rich nuclei became feasible. In such nuclei, excess neutrons/protons are predicted to occupy the molecular orbitals between alpha cores and yield variety of the molecular structures. Missing mass spectroscopies with alpha...
A new research project is presented. It consists in a deterministic quantum statistical model of gaseous track detectors, in particular time-projection chambers. Such detectors are indeed perfect tools to test fundamental principles of quantum mechanics: what is the solution to the Mott problem [1], i.e. the measurement of linear tracks for a spherical radioactive decay? More generally, where,...
The Optical Time projection Chamber (OTPC) [1] was built at the Faculty of Physics of the University of Warsaw as a tool to observe rare decays modes of exotic nuclei with charged particles emission. Over the years, the OTPC has been instrumental for the first direct observation of rare phenomena like two-proton and $\beta$-delayed three proton decay [2,3]. The detection of one decay event...
The population of single-particle states to probe the evolution of shell closures in atomic nuclei is of great interest among research groups around the world. One of the most precise tools for the population of these states is transfer reactions. However, even nowadays with the-state-of-the-art detectors and modern nuclear radioactive ion beam facilities, precise identification of excited...
Sputtering of targets and target backing foils irradiated by intense heavy ion (HI) beams in long-term experiments has been considered on the grounds of available models and experimental data. Experiments on synthesis of superheavy nuclei (SHN), which are carried out in Dubna with Gas-Filled Recoil Separator (DGFRS), are the examples of such kind of experiments. High fluxes of HIs and heat...
Active targets have been used for a variety of nuclear and particle physics experiments since many years. Most of those are ionization chambers (without gas amplification) or TPCs (with gas amplification). Active targets have been proved to be an extremely useful tool for the investigations of light-ion induced reactions using radioactive beams in inverse kinematics, in particular in the...
The Extreme Light Infrastructure-Nuclear Physics (ELI-NP) facility will provide monochromatic, high-brilliance and polarized gamma-ray beams, which can be used to study nuclear reactions of current astrophysical interest through the inverse photo-dissociation processes and detailed balance principle. In particular, of special interest are (p, $\gamma$) and ($\alpha$, $\gamma$) reactions that...
The presence of coherent motions of particles in many-body systems, i.e. collective motions, is a common feature in several branches of physics. In atomic nuclei, a particular case of nuclear collective motion is represented by the giant resonances (GR) [1], which are the subject of this presentation. These resonance states play a key role in the understanding of the nuclear structure because...
In order to maximize the science potentials of low intensities rare isotope beams, we need a new generation of high resolution detectors with high efficiency. Time Projection Chambers (TPC) with large angular coverage and good energy and position resolution can be used in experiments across a broad range of beam energies and extend the scientific reach of radioactive beams.
The SAMURAI Pion...
The ACtive TARget and Time Projection Chamber (ACTAR TPC) is a gas-filled detection system whose construction was finished a few weeks ago at the Grand Accélérateur National d’Ions Lourds (GANIL). The detector benefits from new technologies required for its mechanical design as well as a state-of-the-art electronics system (GET) that enables high pixel densities with fully digitized signals...
NEXT is an experiment to search for the hypotetical double-beta decay without neutrinos of 136Xe nuclei in a high pressure gas TPC. A prototype detector, NEXT-NEW, has been operated at Canfranc Underground Laboratory during 2016. We present the first results and the future prospects of NEXT.
I will report on two detector development projects that are aimed at bolstering missing mass reaction studies using radioactive isotope beams at the RIBF facility. One project is a silicon telescope array TiNA and the other an active target CAT-M, both planned to be coupled with GET electronics to read out a few thousands of channels of GEM or segmented silicon detectors. Detector concepts,...
Measuring reaction fragments from radioactive heavy-ion collisions is crucial to study the nuclear symmetry energy in higher densities than the saturation density. To achieve the goal, developing the analysis software dedicated to the detector system is as important as constructing the detector.
SAMURAI Pion Reconstruction Ion-Tracker Time Projection Chamber (SπRIT TPC) was constructed for...
This presentation will present a, simple, novel technique to extend the dynamic range and recover the charge information from saturated electronics resulting from large energy losses in a TPC. I will also present the software we use to simulate, and calibrate, the dE/dx distributions for the correct particle identification (PID) in the SAMURAI Pion-Reconstruction and Ion-Tracker (S$\pi$RIT)...
Clustering in light nuclei is an important structural feature that has important implications for nuclear theory and understanding nucleosynthesis in astrophysical environments. But more data on where clustering exists, especially in light unstable nuclei, is needed to constrain nuclear models and understand the conditions necessary for prominent cluster structure. In order to look for...
In practically all trackers and TPCs designed today, Micro Pattern Gas amplifiers are used.
In my presentation, after an introduction to the detector lab at CERN, I will cover very briefly the basic technologies that are presently being used in MPGD.
Emphasis will be made on the conceptual designs that have been modified to adapt the instruments to the needs of nuclear physics.
New...
The operation of TPCs is steadily pushed to cope with higher rates.
This forces to consider the influence of space charge which is produced
in the ionisation of the drift gas as well as by ions possibly flowing back
from the amplification region.
The influence of the gas choice as well as a comparison between conventional
multi-wire proportional chambers and multi-pattern gas detectors will...
Instrumenting nuclear physics experiments today is a challenge for a considerable number of projects. Exacting, because of the complexity in the electro-vacuum-mechanics, number of active elements, the full beam integration and of course the physics. Examples will be shown in GDS including mature, recent and project ideas of the gas devices. Also, often, the gas volumes are ringed with solid...
A review of the main techniques and enabling assets for imaging rare processes with gaseous TPCs will be made.
The ACTAR TPC device is being developed in order to perform various types of nuclear physics experiments, based on nuclear reactions studies (“active target”) or on radioactive decays. Since the events topology may be different according to the kind of experiment, two detector geometries are considered in the project, sharing the same electronics (GET).
The first chamber (“reaction”) has been...
I will introduce the active targets CAT-S and CAT-M for missing mass spectroscopy with high-intensity beams and their physics programs. Both active targets are based on GEM-TPC coupled with silicon detectors and designed to be used in combination with high-intensity medium-heavy nuclei beams more than 500-kcps. The first experiment at RIBF with CAT-S and the commissioning of CAT-M at HIMAC...
