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Petr Navratil (TRIUMF)2022-08-08, 10:00 a.m.
I will present an introduction to TRIUMF with a brief overview of experiments at ARIEL and ISAC facilities covering both the current and the future envisioned programs. I will also discuss the theory program at TRIUMF that relates to the ARIEL experimental program. I highlight several recent experimental results from the nuclear astrophysics, nuclear structure, fundamental symmetries, and the...
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Kevin Hahn2022-08-08, 11:10 a.m.
The radioactive ion (RI) beam accelerator facility called RAON is under construction in Korea. It will produce RI beams by both the ISOL and In-flight methods. One of the experimental facilities called KoBRA is expected to carry out nuclear astrophysics experiments using both stable beams and RI beams in the early phase of RAON. Experiments using both stable and RI beams of tens of MeV/u are...
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Dr Deuk Soon AHN (Center for Exotic Nuclear Studies, IBS)2022-08-08, 11:50 a.m.
Exploring the limits of nuclear existence plays an important role in understanding the particle stability of neutron-rich and proton-rich nuclei. It provides many opportunities to study exotic nuclear structures, nuclear reactions and nuclear astrophysics, and it can be a benchmark for theoretical mass models at the extremely exotic region.
In this talk, the research on the rare isotope...
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Yung Hee KIM (IBS CENS)2022-08-08, 2:00 p.m.
The Center for exotic nuclear study in the institute of basic science was recently founded to study fundamental questions in astrophysics and nuclear physics through investigations of radioactive atomic nuclei. Many detectors are currently under development/planned which can be applied for the decay spectroscopy study such as Clover HPGe detector array (ASGARD), Co-axial Ge detector array, Si...
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Yeunhwan Lim2022-08-08, 2:40 p.m.
By employing new energy density functionals, we investigate neutron star properties. The parameters in new energy density functionals are constrained by chiral effective field theory calculations, GW170817, and two nicer analyses using a Bayesian analysis. Nuclear symmetry energy and its slope parameters as well as macroscopic properties of neutron stars such as mass-radius relation, tidal...
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Jeong-Hyuck Park (Sogang University)2022-08-08, 3:50 p.m.
I will start by introducing a gravitational theory that string theory predicts. It differs from general relativity, and can probe not only the mass but also pressure, hence generically equations of state parameters. For the theory to be consistent with observations, ordinary baryonic matter should be ultra-relativistic, which may be so at subhadronic level. This talk is based on a work with...
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Jeremy Holt (Texas A&M University)2022-08-09, 2:00 p.m.
The nuclear optical potential provides an essential tool for studying nucleon-nucleus elastic scattering and reaction cross sections by incorporating the complexity of many-body correlations into an effective one-body mean field between projectile and target. We develop for the first time a microscopic global nucleon-nucleus optical potential with quantified uncertainties suitable for...
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Hu Baishan (TRIUMF)2022-08-09, 2:40 p.m.
We have developed an ab initio Gamow in-medium similarity renormalization group (IMSRG) method capable of describing resonance and non-resonance continuum properties of weakly-bound and unbound nuclear many-body systems. In this talk, I will discuss how to couple nuclear scattering states and decay channels into the in-medium similarity renormalization (IMSRG) framework by using the...
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Ki-Seok Choi (Korea Aerospace University)2022-08-09, 3:50 p.m.
I discuss direct and fusion reactions including weakly-bound and halo nuclei. At first, to this end, I introduce the expended optical potential for direct reaction calculations as elastic scattering, inelastic, and breakup from strand optical model formalism, and emphasize the benefit of extended optical model. Then, I review previous results of direct reactions which include neutron halo...
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Shung-Ichi Ando (Sunmoon University)2022-08-09, 4:30 p.m.
The elastic alpha-carbon-12 scattering at low energies for $l=0,1,2,3,4,5,6$ is studied in effective field theory (EFT). We discuss a construction of the S matrices of elastic alpha-carbon-12 scattering in terms of the amplitudes of sub-threshold bound and resonant states of oxygen-16. The parameters appearing in the S matrices are fitted to the phase shift data below the proton-nytrogen-15...
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EUN JA HA (Hanyang University)2022-08-10, 10:00 a.m.
We investigate the tensor force (TF) effect on the Gamow–Teller (GT) transition strength distributions in 42Ca, 46Ti, and 18O, which are known to have strong low-energy GT states,the so-called low-energy super GT (LeSGT) transition, peculiar to nuclei retaining a neutron number N = Z + 2. The TF is explicitly taken into account in the pairing channels of the residual interaction on top of the...
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Lotta Jokiniemi (TRIUMF)2022-08-10, 11:10 a.m.
The rarest known nuclear process, standard double-beta decay, in which two neutrons in an atomic nucleus turn into protons and two electrons together with two antineutrinos are emitted, has been observed in a dozen nuclei. A neutrinoless mode of the decay, in which only two electrons would be emitted, has been hypothesized but so far not discovered. Observing the neutrinoless mode would...
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Antoine Belley (TRIUMF/UBC)2022-08-10, 11:50 a.m.
As experiments searching for neutrinoless double beta decay are in the planning phase of a next generation with hopes to completely probe the inverted mass hierarchy, the need for reliable nuclear matrix elements, which govern the rate of this decay, is stronger than ever. Since a large discrepancy is found when computing this quantity with different nuclear models, a large unknown still...
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Joochun (Jason) Park (Center for Exotic Nuclear Studies, IBS)2022-08-11, 10:00 a.m.
Shell evolution of Sn isotopes is an active research area in nuclear structure. Recently, Monte Carlo Shell Model calculations predicted shape evolution and active proton core excitations, as explanations for the enhancement of B(E2) values in the light Sn isotopes toward the doubly magic $^{100}$Sn, relative to the simple seniority scheme. Several Coulomb excitation experiments were carried...
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Changbum Moon (Institue for Basic Science)2022-08-11, 11:10 a.m.
We present shape coexistence in the odd-odd Sb (Z=51) and I (Z=53) nuclides; spherical and deformed shapes. With a specific focus on the intruder proton (p) and neutron (n) h11/2 orbitals, we show the deformed rotational bands in Sb and I with N = 63 to 67 as discussing systematic features emerged in the neutron-shell space of 50 < N < 82. In addition, we discuss the chiral-like double bands...
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Gaute Hagen2022-08-11, 11:50 a.m.
Atomic nuclei have good spin, parity, and third component of the isospin. Yet for many nuclei, symmetry unrestricted mean-field calculations find it advantageous to break rotational invariance and particle number conservation such that the vacuum states accurately reflect the emergent symmetry breaking of intrinsically deformed and superfluid nuclei. Starting from such symmetry-breaking...
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Tae-Sun Park (Institute for Basic Science)2022-08-11, 2:00 p.m.
We extend chiral perturbation theory to include vector mesons as well as pions and nucleons. By counting the vector meson mass as heavy while treating the associated momentum as light, a consistent scheme can be obtained with a well-defined power counting rule. We find that the extended theory can describe the electric form factors of pions and nucleons far better than the conventional ChPT...
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Mehdi Drissi (TRIUMF)2022-08-11, 2:40 p.m.
In an attempt to tackle systematically the complexity of strongly correlated quantum many-body systems, modern ab initio approaches have grown more and more sophisticated, both formally and numerically. One standard strategy consists in combining several pre-existing many-body schemes such as symmetry-breaking mean-field calculations with non-perturbative corrections. In this particular...
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Peter Gysbers (TRIUMF / UBC)2022-08-11, 3:50 p.m.
We examine the nuclear reactions 7Li(p,$\gamma$)8Be and 7Li(p,e+e-)8Be from an ab initio perspective.
Using the no-core shell model with continuum technique, with chiral nucleon-nucleon and three-nucleon forces as input, we obtain an accurate description of both 8Be bound states and p+7Li scattering states.
We calculate radiative capture reactions in which enough energy is released to...
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Stefano Gandolfi2022-08-11, 4:30 p.m.
Many progresses have been made in developing nuclear Hamiltonians within the framework of chiral effective field theory. In particular, the develop of chiral interactions that are fully local opened the way of implementing these Hamiltonians in Quantum Monte Carlo calculations. The advantage of using Quantum Monte Carlo methods is that they are not limited to use soft interactions, and...
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Myung-Ki Cheoun2022-08-12, 10:00 a.m.
We discuss the neutrino flavor change effects due to neutrino self-interaction, shock wave propagation as well as matter effect on the neutrino-process of the core-collapsing supernova (CCSN). For the hydrodynamics, we use two models: a simple thermal bomb model and a specified hydrodynamic model for SN1987A. As a pre-supernova model, we take an updated model adjusted to explain the SN1987A...
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Nicholas Manton (University of Cambridge)2022-08-12, 11:10 a.m.
Skyrmions, the stable soliton solutions in an EFT introduced by Tony Skyrme, have been constructed for many baryon numbers (atomic mass numbers). They have interesting intrinsic shapes and also an intrinsic pion field structure. So a Skyrmion spontaneously breaks translational, rotational and isorotational symmetry. These symmetries are restored through quantization of the collective motion...
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Manu Paranjape (Université de Montréal)2022-08-12, 11:50 a.m.
We study Skrymion like configurations in the coset space SO(8)/SU(3). \Pi_3(SO(8)/SU(3))=Z_3, hence the Skyrmions have a sort of triality. We establish the existence of the Skyrmions and give some explicit configurations. We speculate as to their physical import.
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