Friday, Oct. 10, 2014
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Friday, Oct. 10

3:30 p.m.
DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over

4 p.m.
Joint Experimental-Theoretical Physics Seminar - One West
Speaker: Gray Rybka, University of Washington
Title: Toward a Measurement of Neutrino Masses with Cyclotron Radiation Emission Spectroscopy: First results from Project 8

Saturday, Oct. 11

8 p.m.
Fermilab Arts Series - Auditorium
Taylor 2 Dance
Tickets: $28/$14

Monday, Oct. 13

2 p.m.
Particle Astrophysics Seminar - Curia II
Speaker: Zarija Lukic, Lawrence Berkeley National Laboratory
Title: Lyman Alpha Forest in Optically Thin Cosmological Simulations

3:30 p.m.
DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over

THERE WILL BE NO ALL EXPERIMENTERS' MEETING THIS WEEK

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Weather Mostly sunny
58°/36°

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Wilson Hall Cafe

Friday, Oct. 10

- Breakfast: big country breakfast
- Breakfast: chorizo and egg burrito
- Backyard pulled pork burger
- Asian braised beef and vegetables
- Southern fried chicken
- Turkey and cucumber salad wraps
- Big beef or chicken burrito
- Cioppino
- Texas-style chili
- Assorted pizza by the slice

Wilson Hall Cafe menu

Chez Leon

Friday, Oct. 10
Dinner
Guest chefs: Grace and Gary Leonard
- Mushroom and wild rice soup
- Tunisian fishcakes with aioli couscous
- Grilled asparagus
- Carottes rapees
- Praline pumpkin pie

Wednesday, Oct. 15
Lunch
- Orange glazed pork tenderloin
- Cranberry tabbouleh
- Snap pea sauté
- Apple crisp

Chez Leon menu
Call x3524 to make your reservation.

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In Brief

Laboratory celebrates startup of NOvA experiment

Fermilab staff tour the new ROC West, which scientists now use to monitor three neutrino experiments: NOvA, MINERvA and MINOS. Photo: Reidar Hahn
People enjoy a celebratory dinner for all lab employees and users. Photo: Reidar Hahn
Lab staff and users make use of the new high tables in the cafeteria. Photo: Reidar Hahn
Chanson du Chat, featuring Fermilab's Steve Gaugel on saxophone, performed in the Fermilab Art Gallery. Photo: Reidar Hahn

On Wednesday, the laboratory celebrated the startup of Fermilab's 500-mile-long neutrino experiment NOvA with food and music.

NOvA is the most powerful accelerator-based neutrino experiment ever built in the United States and the longest-distance one in the world. After nearly five years, NOvA construction is officially complete. Now scientists will use NOvA's two massive detectors, placed 500 miles apart, to study neutrinos, among nature's most elusive particles.

Photo of the Day

Five points

Jimson weed grows at site 52. Photo: Lori Limberg, ESH&Q
In the News

A huge new neutrino experiment, No╬Ża, is up and running at Fermilab

From The Guardian, Oct. 6, 2014

Neutrinos fill the universe. The sun bathes us in them, radioactive decays spray them around, and cosmic rays bombard us with them. And they nearly all miss, because neutrinos hardly ever interact with matter. Detecting them at all takes something special.

Yet they are fascinating. They oscillate between three different types as they move, they may hold the key to why there is more matter than antimatter around, and they may even be Majorana particles.

So it is exciting that the latest, and so far greatest, neutrino experiment has just begun operation, in Fermilab, Chicago, Illinois. And in Ash River, Minnesota, since the beam is more than 800 km long.

Read more

In the News

New experiment will beam neutrinos through 500 miles of Earth's crust to find some of the universe's best-kept secrets

From ExtremeTech, Oct. 7, 2014

The neutrino is one of the most elusive and fascinating subatomic particles scientists have had the opportunity to study. A better understanding of these minuscule, weakly interacting particles could unlock new areas of science and help us fathom the nature of the universe, and a pair of facilities placed 500 miles apart in the midwest USA might be the first step in that process. After five years of construction, the NOvA experiment is up and running to study neutrinos as they travel those 500 miles in the blink of an eye.

Read more

In the News

Canada's superconducting electron linear accelerator produces first beam

From Interactions.org, Oct. 7, 2014

On September 30th, TRIUMF's newly constructed superconducting electron linear accelerator (e-linac) produced its first particle beam at an initial energy of 23 MeV. The cutting-edge accelerator technology was designed and built in cooperation with institutions and industry across the country. Acceleration of first beam through the complete e-linac system culminates a series of recent successes for the Advanced Rare Isotope Laboratory (ARIEL) project and sets ARIEL on its path forward.

Read more

Frontier Science Result: Auger

What are cosmic rays made of? Auger homes in

This plot shows the fitted fraction of protons, helium nuclei, nitrogen nuclei and iron nuclei found in cosmic rays by the Auger experiment.

The Auger collaboration has recently released its latest result on the composition of ultra-high-energy cosmic rays (UHECRs) — particles that reach us from beyond our solar system — for energies above 7x1018 eV.

Similar to the way particle beams generated by accelerators strike and interact with material in a stationary target, UHECRs interact with nuclei in the upper atmosphere and subsequently generate a cascade of particles. This extensive air shower is interpreted through simulations that require interaction models of hadrons — composite particles that interact through the strong force. Data from manmade accelerators, including the Tevatron and LHC, are used to build models of particle interactions occurring at higher energies. Scientists deduce characteristics such as a cosmic ray's energy and composition from the air shower's properties.

Although studied for decades, the origin and nature of these highly energetic particles are still unknown. Ten years ago, UHECRs were thought to be protons, with iron nuclei as a radical alternative. To date, the most reliable method to study UHECR composition is through measurements of the atmospheric depth-of-shower maximum (Xmax), which depend on the masses of the primary cosmic rays.

For the first time in the history of cosmic ray studies, scientists used the full Xmax distribution to study cosmic-ray composition, made possible through the large collecting area of the Auger experiment. Prior studies used only the distribution's mean and standard deviation. Although the overall features of the composition can be studied through these two moments, only the complete distribution can disclose full information on composition and hadronic interactions.

Researchers fitted the Xmax distribution with predictions from a variety of hadronic interaction models for variations in the composition of the cosmic ray, examining the quality of fit. There were a number of unexpected findings: When compared with current hadronic interaction models, the data are incompatible with a composition dominated by protons, nor can they support a large presence of iron nuclei. Intermediate components such as helium nuclei or nitrogen nuclei are required for the models to be compatible with data.

Using the full Xmax distribution has given us valuable insights into hadronic interactions for a wide range of energies (40 to 140 TeV in center-of-mass energy). Scientists were able to constrain hadronic interaction models when it was apparent that fit qualities will not improve, no matter what the composition mix is. Such was the case for one model. For another, the fit quality was good with the composition combination used, such that adding more species will not change any conclusions.

These findings would have been completely unexpected 10 years ago and pose a more intriguing picture of what these energetic particles are. That even Auger lacks statistics for composition analysis at energies above 5x1019 eV, where the arrival direction of cosmic rays appear to correlate with nearby matter, is a tantalizing prospect for researchers. Knowing the composition at this energy scale is crucial, and elucidating it is one of the aims of the proposed Auger upgrade.

The paper has been accepted by Physical Review D and is available on the arXiv and INSPIRE.

Eun-Joo Ahn

Fermilab physicists Eun-Joo Ahn and Peter Kasper led this analysis.
Announcements

Today's New Announcements

Zumba Fitness registration due Oct. 16

Interpersonal Communication Skills - Oct. 21

Managing Conflict - Nov. 5 (morning only)

Access 2010: Advanced - Nov. 12

Excel 2010: Advanced - Dec. 3

Pace Batavia Call-n-Ride service to Fermilab

Nominations for Director's Award close today

CryptoCard end of life - Oct. 11

Paul Taylor's Taylor 2 Dance in Ramsey Auditorium - Oct. 11

Barn Dance - Oct. 12

Mat Pilates class now offered at Fermilab - register by Oct. 13

Zumba Toning registration due Oct. 14

Gallery talk - Oct. 15

Ultimate Core class registration due Oct. 15

Lecture Series: Success and Failure in Engineering - Oct. 24

Excel 2010: Intermediate - Oct. 29

NALWO Playgroup meets Wednesdays at Users Center

International folk dancing Thursday evenings at Kuhn Barn

Scottish country dancing Tuesday evenings at Kuhn Barn

English country dancing at Kuhn Barn

Indoor soccer

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