Nuclear Physics Seminar
"The sPHENIX Calorimeters: a proto-type story"
Presented by Megan Connors, Georgia State University and RBRC
11 am, Small Seminar Room, Bldg. 510
Tuesday, March 14, 2017, 11:00 am
Hosted by: 'Jin Huang'
sPHENIX, scheduled to start taking data in 2022 at RHIC, is a detector designed to probe the inner workings of the quark gluon plasma by measuring jets and their substructure, heavy flavor tagged jets and quarkonia. The design includes tracking systems, a solenoid magnet and calorimeter system. The calorimeter system, designed to measure the energy of jets, is comprised of an electromagnetic calorimeter, an inner hadronic calorimeter and and outer hadronic calorimeter. Prototypes of these detectors were built and tested in 2016. The results of the test beam show that the performance is well within the requirements set by the sPHENIX program. In addition, the results validate the GEANT4 simulation studies. The design of the sPHENIX calorimeter system, the test beam results from the calorimeter prototypes and additional studies will be presented
Nuclear Theory/RIKEN Seminar
"A solitonic approach to neutron stars: The (BPS) Skyrme model"
Presented by Carlos Naya, Durham
2 pm, Small Seminar Room, Bldg. 510
Friday, March 24, 2017, 2:00 pm
Hosted by: 'Heikki Mantysaari'
The Skyrme model is a low energy effective field theory of strong interactions where nuclei and baryons appear as collective excitations of pionic degrees of freedom. Proposed by Tony Skyrme in the sixties, his ideas received further support when it was discovered that in the limit of the large number of colours of QCD, an effective theory of mesons arises. In the last years, there has been a revival of Skyrme's ideas and new related models, some of them with BPS bounds (topological lower energy bounds), have been proposed. It is the aim of this talk to focus on the one known as BPS Skyrme model. After a brief introduction to this BPS limit we study its application to neutron stars where we will find that high maximal masses are supported. In addition, the BPS Skyrme model allow us to perform both mean-field and exact calculations and a comparison between both approaches will be presented.