[Divulgacao] Fwd: Café com Física: quarta-feira, 7 de Junho às 14h00 na sala de Conferências - Dept. Física

[Mafalda Fernandes]

-------- Mensagem reencaminhada --------
Assunto: 	Café com Física: quarta-feira, 7 de Junho às 14h00 na sala de 
Conferências - Dept. Física
Data: 	Tue, 6 Jun 2017 09:08:49 +0100
De: 	José António da Cruz <jacruz at fis.uc.pt>
Para: 	aagomes at mat.uc.pt, mjaraujo at qui.uc.pt, cneves at ci.uc.pt, 
secretaria.pessoas at deec.uc.pt, teresa at dec.uc.pt, 
isabel.martins at dem.uc.pt, mafalda at eq.uc.pt, acdiana at bot.uc.pt, 
marcia at dei.uc.pt, secretaria at darq.uc.pt, luis.neves at fct.uc.pt



*Caros colegas,*

**

*Agradece-se divulgação deste evento.*

*Cumprimentos*

*JCRUZ*

**

*==================================*

**

*Café com Física *

Estão todos convidados *para uma nova sessão do Café com Física,* 
*quarta-feira, *

*dia**7 de****Junho****às 14h**na Sala de Conferências do 3º andar* onde 
o nosso convidado

*Prof. David Nygren *(University of Texas at Arlington),

nos servirá café com

*The Matter – Anti-matter Asymmetry of the Universe: Why is there 
something, rather than nothing?***

**

**

O Prof. David Nygren é Fellow da American Physical Society e membro da 
National Academy of Sciences, tendo recebido vários prémios entre os 
quais a distinção presidencial.

Do seu vasto trabalho  realça-se a invenção da TPC (time projection 
chamber) que é um dos detectores mais usados hoje em dia na física de 
partículas.**

**

**

*Resumo**:***

**

Our universe is filled with matter, but antimatter is an ephemera, seen 
only naturally in the debris of high-energy processes and cosmic rays. 
Yet the standard model of particle physics and cosmic implies that only 
about 1 proton or anti-proton in about 1020 should have escaped 
annihilation into photons or neutrinos.  The measured ratio, however, of 
baryons–protons and neutrons–to the photons left over is about 6 x 
10-10, ten orders of magnitude greater! At some very early moment, 
something broke that initial symmetry, yielding ultimately the universe 
we inhabit and explore today. The attractive theory of leptogenesis, 
with massive neutrinos that distinguish between matter and antimatter, 
predicts this ratio and imposes a Majorana nature on today’s 
neutrinos–neither matter nor antimatter. The only practical avenue for 
discovering a Majorana nature is the search for an almost unimaginably 
rare nuclear decay–neutrinoless double beta decay–possible in a few 
isotopes. If we convincingly observe this decay mode, we learn that that 
lepton number is not conserved and that the neutrino and anti-neutrino 
are identical. I focus on NEXT, a search based on high-pressure xenon 
gas that attempts to realize excellent energy resolution and high 
rejection of backgrounds through event topology. Strangely, a 
biochemistry technique might help us succeed. Perhaps an exciting 
discovery awaits, one that may indicate how the universe chose to keep 
about one part per billion of matter.


Os organizadores

Filipe Veloso e Pedro Costa

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.eq.uc.pt/pipermail/divulgacao/attachments/20170606/755036fc/attachment.htm>