home  contact us  site map

Lunchtime Seminars

Tuesdays ~ 12pm ~ Kolker Room, 26-414


Gunther Roland, Chair ~ Doug Hasell~ Paolo Zuccon

February 9, 2016


Gunther Roland, MIT

Jet physics in the 2020's with CMS and sPHENIX

The strongly interacting quark-gluon plasma produced in ultrarelativistic heavy ion collisions at RHIC and LHC is, by some measure, the most perfect known fluid. Understanding how this near-perfect fluidity arises from the underlying interactions of quarks and gluons is one of two main goals of heavy ion experiments at RHIC and LHC in the next decade and beyond. Multi-scale probes such as high pT jets and different quarkonia states are the key diagnostic tools in these studies. I will discuss the approach of the MIT heavy-ion group to this program using the CMS@LHC and proposed sPHENIX@RHIC experiments.


time:    Noon
place:   Kolker Room (26-414)

(Lunch will be served at 11:50.)

February 15, 2016


No Seminar

Monday schedule observed


February 23, 2016


Adrien Hourlier, Universite Paris Diderot

Fast NEutron Detection with DCTPC

Fast Neutrons represent a major background for low background experiments, such as shallow reactor neutrino experiments and dark matter experiments. Neutron flux measurements have been carried out by the KARMEN2 experiment at the surface, KamLAND at 2700 m.w.e. and by LVDS at 3200 m.w.e. but a gap persists for shallower experiments.
A low-pressure gaseous TPC was developed to measure the fast neutron spectrum in Double Chooz underground halls. Neutron scatterings are detected through the ionization track to the nuclear recoil of helium present in the vessel, projected on an anode plane. The use of a CCD to image the anode plane provides 2D information. The vertical projection can be accessed by recording the waveforms of the charge read out on the anode plane and ground mesh. Using this technique, the energy of an event can be reconstructed with a precision of the order of ~2%.
Located in both experimental halls of the Double Chooz experiment, DCTPC provides measurements at shallow depths, with 120 m.w.e. and 300 m.w.e. shielding. The two experimental conditions allowed us to observe the change in the relative proportions of the two major neutron production
mechanisms, spallation from cosmic muons and ambient radioactivity.


time:    Noon
place:   Kolker Room (26-414)

(Lunch will be served at 11:50.)