[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

[TRIUMF Seminars]

Date/Time: Tue 2012-09-11 at 13:00

Location:  Theory Room         

Speaker:   Calvin Johnson (San Diego State U)

Title:     The origin of nuclear (not nucleon) spin

Abstract: Atomic nuclei with an even number of protons and neutrons always have J = 0 
ground states. Textbooks attribute this to the pairing interaction; but 
numerical simulations with randomly chosen interactions show that, contrary 
to simple statistical expectations, the majority of _all_ interactions also 
have J = 0 ground states. As part of understanding this phenomenon, I 
consider an illustrative analogy of random matrices with polyhedra 
symmetries, and demonstrate a suprising universality among J-projected widths 
for many-body systems.



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