Seminars

Tuesday, Oct 15 at 5:30 PM
1300 FRIB Laboratory
Charles Limb, Francis A. Sooy Professor of Otolaryngology-Head and Neck Surgery and the chief of the division of Otology, Neurotology and Skull Base Surgery at University of California, San Francisco
Musical creativity and the brain

Abstract:  Musical creativity has existed since the earliest days of human civilization. Until recently, how the brain actually produces musical ideas was poorly understood. Recent advances in brain imaging have allowed us to address questions of artistic significance that were previously felt to be inaccessible to scientific inquiry. Of the multiple creative processes that take place in music, improvisation—the spontaneous generation of musical material—provides an inspiring tool to study these processes. This presentation will highlight several functional neuroimaging studies that have examined the process of musical improvisation in expert jazz and hip-hop musicians, as a window into the complex neural processes that give rise to creativity. This talk is supported in part by the Michigan State University Vice President of Research and Graduate Studies.

Saturday, Oct 19 at 2:00 PM
Wharton Center for Performing Arts
Physics Girl Dianna Cowern,
Physics girl - the collision of science and art

Abstract:  As part of the FRIB Saturday Morning Physics series, the MSU Science Communication organization (MSU SciComm) in partnership with FRIB presents its first live science-art show featuring Physics Girl. The show will be at the Wharton Center for Performing Arts. Free tickets are required for entry. The show will also be livestreamed inside the FRIB auditorium, in conjunction with the MSU SciComm science-art exhibition outside the FRIB auditorium. Other SciComm events are planned, including an FRIB virtual tour on the dome of Abrams Planetarium, and a “Beat the Scientist” event at The Grid Arcade and Bar.

Monday, Oct 21 at 12:30 PM
1400 Biomedical and Physical Sciences Building
Wolfgang Kerzendorf, MSU Physics and Astronomy
Nucleosynthesis constraints through very late observations of type Ia supernovae

Abstract:  Type Ia supernovae are likely the thermonuclear explosion of relatively massive white dwarfs. The ignition process for these normally inert objects remains a mystery. The community has identified several plausible ignition scenarios (accretion from a companion, merger of white dwarfs, compression through the explosion of a helium shell, etc.). The current plethora of viable models matches the data of the first weeks to months - making it hard to distinguish between them. In this talk, I will show that, while the current feasible models produce very similar amounts of Ni56, their Ni57 and Co55 yields can be very different. These isotopes have decay chains with half-lives of hundreds of days leading to light-curves differences in very late epochs of 500 days and more. I will discuss the work on the extremely late light-curves (>1000 days) of the very nearby SN2011fe and the challenges faced. I will conclude by discussing how JWST will provide crucial observing capabilities that will finally allow us to rule out several of the proposed models.

Tuesday, Oct 22 at 11:00 AM
1200 FRIB Laboratory
Alexandros Gezerlis, University of Guelph
From alpha clustering to homogeneous matter

Abstract:  Over the last few decades the study of nuclei and neutron-rich matter from first principles has entered a new era. This has partly been driven by the development of novel interactions between two or three nucleons. In an attempt to produce a systematic expansion, several groups have produced Effective Field Theory (EFT) interactions, whether of finite range (chiral EFT) or zero range (pionless EFT). Pionless EFT has been quite successful in studies of cold-atomic Fermi gases. In this talk, I will present recent Quantum Monte Carlo calculations of 8-particle systems and discuss their impact on 8Be and the physics of alpha clustering. I will also discuss recent work on trying to connect ab initio theory with simpler qualitative pictures. Specifically, I will address the first ever systematic non-perturbative calculations of the single-particle excitation spectrum in strongly interacting neutron matter. In addition to impacting light and neutron-rich nuclei, this work and this talk also touch upon the physics of ultracold gases and of neutron stars.

Thursday, Oct 24 at 11:00 AM
1200 FRIB Laboratory
Wolfgang Mittig, Michigan State University
Dark matter research in nuclear physics
Monday, Oct 28 at 4:00 PM
1309 FRIB Laboratory
Prof. Shinichi Namba, Hiroshima University
High-density cascade arc plasma sources for application to plasma windows for virtual vacuum interfaces

Abstract:  We have developed two cascade arc plasma sources for application to plasma windows for virtual vacuum interfaces. For windowless vacuum–atmosphere separation enabling us to carry out an electron beam welding under atmospheric air condition, a compact arc discharge source having a channel diameter of 3 mm is fabricated, and an atmospheric Ar thermal plasma is generated. On the other hand, to generate a highly charged 238U65+ ion beam with a high intensity and high energy of 10.8 MeV/u in heavy ion accelerators, a He gas charge stripper target has been employed in the Radioactive-Isotope Beam Factory (RIBF) at RIKEN. Using a cascade arc plasma as a virtual window creates an effective vacuum interface to isolate the high pressure He gas cell from the lower pressure vacuum stages. Therefore, we also developed a larger diameter cascade arc discharge apparatus (channel diameter: 8 mm) for application to an alternative differential pumping system. The performances of the two cascade arcs as plasma windows are investigated. The 3-mm arc discharge generates a steep pressure gradient of Ar 100 kPa to 100 Pa through the discharge channel, while the 8-mm discharge apparatus isolates the high-pressure side at 7 kPa from the lower pressure of 54 Pa. Emission spectroscopy of visible and vacuum UV radiation reveals the characteristics of the Ar and He plasmas. Spectral analysis yields a plasma temperature of around 1 eV in both discharges. Stark broadenings of the H- and Ar I lines give an electron density of 6.5×1016 cm–3 for Ar 60 A with a gas flow rate of 1.0 L/min, and 4.7×1013 cm–3 under a He 100-A and 0.45-L/min condition.

Tuesday, Oct 29 at 11:00 AM
1200 FRIB Laboratory
Alexander Volya, Florida State University
Atomic nucleus an open quantum many-body system

Abstract:  The atomic nucleus is a natural self-binding quantum many-body system where structure and stability are governed by an intricate interplay of quantum many-body interactions and the dynamics in the nuclear reaction continuum. The atomic nucleus is an outstanding research laboratory that allows us to target the generic phenomena of finite open quantum many-body systems, such as formation of the mean field, collective and chaotic dynamics, effects of particle decay, and clustering. In this presentation I will discuss the physics of decays and reactions involving unstable nuclei and I will demonstrate how a consistent simultaneous description of many-body structure and reactions can help in resolving fundamental questions of modern science.

Thursday, Oct 31 at 11:00 AM
1200 FRIB Laboratory
Shumpei Noji, Michigan State University
Conceptual design of the HRS
Tuesday, Nov 05 at 11:00 AM
1200 FRIB Laboratory
Young-Ho Song, Rare Isotope Science Project, Institute for Basic Science
Title to be announced
Thursday, Nov 07 at 11:00 AM
1200 FRIB Laboratory
Skyy Pineda, Michigan State University
New measurement of the 1S-3S transition frequency of hydrogen: Contribution to the proton charge radius puzzle
Monday, Nov 11 at 12:30 PM
1400 Biomedical and Physical Sciences Building
Rene Reifarth, Goethe University Frankfurt
Experiments with stable high-energy beams

Abstract:  High energy beams of stable nuclei are mostly used as a first step to produce beams of radioactive species. However, there are interesting applications based on the direct usage of the accelerated stable nuclei. We recently performed an experiment at GSI using O-16 beam at an energy of 500 AMeV. We observed the Coulomb breakup into C-12 and He-4 after interaction with a thin lead target. The idea is to constrain the astrophysically very interesting C-12(a,g) rate, which is the time-reversed reaction of the investigated Coulomb breakup. Ion storage rings offer new opportunities to investigate astrophysically interesting reaction in inverse kinematics. We performed proton capture experiments on stable Xe-124 in the energy regime of the gamma-process. The xenon ions were first accelerated to about 100 AMeV then fully stripped, injected into the Experimental Storage Ring at GSI. The actual measurement was performed after the ions were slowed down to 5-10 AMeV using a hydrogen droplet target. Fully stripped ions can have a significantly shorter beta-decay half-life than neutral atoms. The corresponding process is called bound-state beta decay. In the extreme case, nuclei, which are stable under terrestrial conditions, can beta-decay in the inner-most regions of stars. This process can be investigated with ion storage rings. I will review recent accomplishments using stable high-energy beams to infer astrophysically interesting reaction rates. In addition, I will share and discuss ideas for future experiments.