News

Physics professor strengthens Notre Dame-Colima relationship

January 26, 2018 • Categories: News

Webp

Antonio Delgado, a physics professor at the University of Notre Dame, visited the University of Colima in early January to promote particle physics and encourage collaboration between Notre Dame and Colima.

Wiescher receives AAS Laboratory Astrophysics Prize

January 18, 2018 • Categories: News

Michael Wiescher

Every year, the American Astronomical Society (AAS) Laboratory Astrophysics Division awards a prize to an individual who has made significant contributions to laboratory astrophysics over the course of his or her career. The 2018 award went to Michael Wiescher, the Freimann Professor of Physics. He was recognized for his significant contributions to the experimental foundation of nuclear astrophysics, as well as his research that closes the gap between experiment and theory in the field.     

Physicist awarded $1.4M to continue work at CERN

January 10, 2018 • Categories: News

Mitch Wayne 250

University of Notre Dame physicist Mitchell Wayne was awarded $1.4 million for continued work on the Phase I upgrade of the Compact Muon Solenoid Detector at the Large Hadron Collider at European Organization for Nuclear Research (CERN).

Astrophysicist Beers collaborates on article about formation of heaviest elements in universe

January 04, 2018 • Categories: News

Notre Dame Chair in Astrophysics Timothy C. Beers collaborated with Anna Frebel, associate professor of physics at the Massachusetts Institute of Technology, on a review article about the formation of the heaviest elements in the universe.

Nuclear physics, the common ground in Cuba and Armenia for physics professor Aprahamian

December 15, 2017 • Categories: News

Aprahamiam 250

During recent trips to Cuba and Armenia, Ani Aprahamian, Freimann Professor of Experimental Nuclear Physics, met both President Serzh Sargsyan of Armenia and Fidelito Castro, the son of the late and Cuban leader Fidel Castro, to talk about nuclear physics.

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Events

Mon Feb 26, 2018

Nuclear Physics Seminar: Dr. Mark Roberts, Woods Hole Oceanographic Institution

4:00 PM - 5:00 PM
124 Nieuwland Science Hall

Why does an Oceanography Institution have a Particle Accelerator?

Dr. Mark Roberts
National Ocean Sciences AMS Facility
Woods Hole Oceanographic Institution

Hosted by Prof. Peaslee

Posted In: Nuclear Seminar

Tue Feb 27, 2018

Astrophysics Seminar: Dr. Gen Chiaki, Georgia Tech

12:30 PM - 1:30 PM
184 Nieuwland Science Hall

Formation criterion and process of extremely metal-poor stars: the role of first supernovae

Dr. Gen Chiaki
Postdoctoral Researcher, Georgia Tech

Metal-poor stars are living fossils with records of the metal enrichment in the early Universe. They are classified primarily into C-enhanced metal-poor (CEMP) stars and C-normal metal-poor (CNMP) stars according to their carbon abundances. Recently, the new classification of CEMP stars is presented. Their carbon and iron abundances show lower limits of A_cr(C) ~ 6 and [Fe/H]_cr ~ -5, respectively. This suggests the critical elemental abundances above which thermal emission cooling of carbon and silicate grains operates to induce the fragmentation of their parent gas clouds, and low-mass stars are likely to be formed. Since the dust cooling rate depends on the condensation efficiency of metal and grain size distribution with a given metallicity, we estimate them from the observed lower-limits of carbon and iron abundances. Then, we derive the critical condition of the formation of EMP stars. The different classes of CEMP stars are well-explained as the difference of main grain species for their formation.

     We also present results of numerical simulations of the metal-enrichment process and EMP star formation. From their small metal content, they are considered to acquire heavy elements from a single or several supernovae (SNe) of first-generation (Pop III) stars. We simulate the feedback effects of photoionization and SNe with a range of masses of Pop III stars and hosting minihalos (MHs). For pair-instability supernovae (PISNe) with large explosion energy ~30x10^{51} erg, the ejected gas reaches to the neighboring halos, i.e., external enrichment (EE) takes place in all relevant mass range of MHs. Yet, the metals cannot penetrate into the central part of halos, and the resulting metallicity is [Fe/H] < -5. This is consistent with no observational sign of PISNe among EMP stars. For core-collapse supernovae (CCSNe) with normal explosion energy ~1x10^{51} erg, the ejected gas falls back into minihalos and internal enrichment (IE) occurs. The metallicities in the recollapsing region are -5 < [Fe/H] < -3 in most cases. We can conclude that IE by CCSNe can explain the metallicity range and elemental abundance ratios of EMP stars.

Posted In: Astrophysics Seminar

Anna Woodard PhD Defense

1:00 PM - 3:30 PM
Room 202

Anna Woodard Defense Announcement

Posted In: Ph.D. Defense

Particle Physics Seminar: Prof. Radovan Dermisek, Indiana University

4:00 PM - 5:00 PM
415 Nieuwland Science Hall

Understanding parameters of the standard model from the MSSM extended by a complete vectorlike family

Prof. Radovan Dermisek
Theoretical Particle Physics
Indiana University…

Posted In: Particle Physics Seminar

Wed Feb 28, 2018

Physics Colloquium: Prof. John LoSecco, University of Notre Dame

4:00 PM - 5:00 PM
118 Nieuwland Science Hall

The history of supernova neutrinos

Prof. John LoSecco
Department of Physics
University of Notre Dame

Supernovae, the largest explosions in the universe, mark the end of nuclear burning for massive stars. This talk traces our understanding of stellar mechanisms from the mid 19'th century to the present. In many cases progress in astrophysics was delayed until future physics discoveries were made. Somewhat surprisingly, the neutrino, a relatively poorly understood elementary particle, plays a critical role in these mechanisms.

Posted In: Colloquia

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