update unbutu from command line

sudo apt-get update &&  sudo apt-get upgrade

What I learned about the shower profile

A muonic component,which arrives early and is weakly spread in time ,as the muons propagate in straight line.

An electromagnetic component is more spread in time as its propagation is more diffusive.  

All airshower particles have a velocity of c however the muons travel in straight lines once created and therefore arrives first with a narrower time spread compared tothe electromagnetic component. 

In the WCD(water cherenkov detector),the electron and gammas are completely converted while the vertical muons deposit approximately 240 MeV of energy.

New focus on my general

1. Understand the physics of shower curvature
2. Try to reproduce the jump method

一些概念

AGN:
Active Galactic Nucleus. The core of an active galaxy responsible for the enormous luminosity. Many contains massive black holes.

Cerenkov Light:

Light emitted by a medium when traversed by a charged subatomic particle moving with a velocity greater than the speed of light in that medium. The light is emitted in the direction of motion of the inducing particle.

Extensive Air Shower

 A cascade of subatomic particles in the earth's atmosphere, initiated when an energetic cosmic ray collides with an atmospheric atom or molecule.

Flourescent Light

Light emitted through the excitation and ionization of atoms and molecule by high-speed charged subatomic particles. This light is emitted in all directions,unlike the beamed Cerenkov light.

Ionization

The process by which an tom loses electrons. May occur when a charged high-speed subatomic particle passes through a collection of atoms.

The air fluorescence yield
is defined as the number of photons produced by a charged particle
per meter of travel.

elongation rate

if you plot the different Xmax data on y with the energy on x , the slope is the elongation rate

General Exam 开始准备

加油加油！

Good Root Color Scheme

kBlue,
kGreen+4,
kRed,
kMagenta,
kCyan+2