A long-standing goal of nuclear theory is development of a predictive ab initio framework for nuclear structure and reactions. One such framework is the no-core shell model with continuum (NCSMC), in which the many-body wave function is expanded in terms of eigenstates of the many-body Hamiltonian obtained within the no-core shell model (NCSM), i.e. using the harmonic-oscillator basis, and...
Measuring Atomic Parity Violation (APV) in the weak interaction is an excellent way to test the standard model at low momentum scales. One way to do this is studying parity violating transitions in alkali atoms. Francium is the ideal element to use in these searches, as its heavy mass gives a relativistic enhancement to parity violating transitions 18 times that of Cesium. The Francium...
ARIEL presents a new playground not only for nuclear physics, but also for medical applications of nuclear physics. ARIEL has the capability to produce photons for FLASH radiotherapy (RT), a capability currently available at only a few laboratories worldwide. In 2021, in vivo FLASH RT and conventional RT experiments were performed on mice using 10 MV photons at ARIEL.
Production of Ac-225, an...
The combination of a germanium detector array, charged particle detector
and recoil mass spectrometer with the neutron-rich radioactive beams
available upon completion of ARIEL
will allow for an entirely new suite of measurements using
fusion-evaporation, radiative-capture, and transfer reactions. This
presentation will discuss the selectivity achieved by coupling the
TIGRESS...
Neutrinoless double-beta decay ($0\nu\beta\beta$) offers a way to probe for physics beyond the Standard Model. Observation of $0\nu\beta\beta$ will validate the Majorana nature of neutrinos, demonstrate violation of lepton number explaining the observed baryon asymmetry in the universe, and probe new mass generation mechanisms up to the GUT scale. The planned nEXO experiment will search for...
The SCI-CASTER project at the SFU Nuclear Science Laboratory aims to develop position-sensitive ionization chamber detector technologies for precision charged particle measurements. Modern waveform digitization and analysis methods enable this by allowing for the direct application of the Shockley-Ramo theorem to the induced charge signals of the ionization chamber, yielding measurements of...
Proof that our Early Solar System (ESS) was irradiated with short-lived radionluclides (SLR's) from an external supernovae is well-evidenced by the fossil presence of $^{26}$Al, $^{41}$Ca, $^{60}$Fe and other SLR's in ancient geologic and meteoritic phases. Many of these SLR's (i.e. $^{26}$Al) find significance as radiometric clocks that record the formation of ESS solids and the timings of...
Mass spectrometry plays an important role in many fields of physics research such as nuclear astrophysics, nuclear structure, and fundamental symmetries. Precise knowledge of masses is critical to these studies. For example, a relative mass precision of $≤10^{-8}$ is required to probe the Standard Model and beyond. This level of precision with radioactive species has been achieved only with...
F. Herwig, P. Denissenkov, J. Issa
Astronomy Research Centre and Department of Physics and Astronomy, Univeristy of Victoria
Recent advances in 3D hydrodynamic simulations of stellar interiors and multi-zone nucleosynthesis calculations have identified specific nuclear reaction rates on unstable species whose experimental determination would significantly reduce uncertainties in predicted...
We will give an overview of recent results from IRIS experiments and discuss future directions enabled by ARIEL.
Studies to probe the internal structure and interactions of nuclei often require precise measurement of radiation emitted from nuclear reactions or decay. Any particular modern nuclear experiment requires unique experimental conditions, creating a demand for versatile radiation detection arrays that can meet a wide variety of experimental needs, with minimal adjustment of physical hardware....
Work has already been done at TRIUMF to directly study ($\alpha$,n) reactions using both DRAGON and EMMA, with the aid of the DEMAND neutron detector array. These reactions are important for understanding both the weak r-process and the s-process. Many of the reactions relevant to the weak r-process involve neutron-rich radioactive nuclei. ARIEL will expand TRIUMF’s rare isotope beam...
TRINAT has at least four existing efforts with opportunities for collaborators and their students. A correlation between spin, beta, and recoil has enhanced sensitivity to time-reversal odd, parity-even, isospin-breaking nucleon-nucleon interactions because of 47K decay's isospin-hindered Fermi component, making it potentially complementary to MORA's more general decays as well as to electric...
Probing shape coexistence in $^{114}$Sn using decay spectroscopy with GRIFFIN
Experiments of highly suppressed or forbidden nuclear decays, like double-gamma decay or nuclear excitation by electron capture, require weeks-long setup and observation times in the TITAN-EBIT, which had been curtailed by the over-subscription of the ISAC era. The results of these experiments have far-reaching implications, including direct probes of electric dipole polarizability and the...
The neutron-rich region surrounding $^{78}$Ni provides a stringent test of nuclear structure far from stability and plays a central role in the astrophysical r-process responsible for the A≈80 abundance peak. As a doubly-magic nucleus, $^{78}$Ni offers a key benchmark for investigating the persistence of the N = 50 shell closure in extremely neutron-rich nuclei. However, direct mass...
The development of ARIEL and other new facilities which expand experimental capabilities to study atomic nuclei triggers the need to advance theories of nuclear structure and reactions. A strong theoretical framework addressing nuclear properties from first-principles is necessary to direct exploration, formulate informative experiments, and interpret the data that ARIEL will grant access...
An optical Time Projection Chamber (oTPC) is proposed for low-energy nuclear physics experiments at TRIUMF/ARIEL, using a Timepix3-based single-photon camera as readout. When charged particles ionize the detector gas, the resulting electron avalanches produce scintillation light captured by an externally mounted camera with an image intensifier — avoiding the complexity of conventional...
Nuclear reactions reveal critical information about nuclear structure and nuclear astrophysics. Some studies, like half-life determinations, are directly relevant to understanding the evolution of nuclear shells, while others have an indirect impact through the production of exotic species to advance the pathway of the rapid-neutron-capture process. The common requirement for these studies at...
