POSITRON

positron is antielectron 

ANTIPROTON IS ATHE ANTI PARTICLE OF PROTON.

ITS MASS IS SAME AS PROTON BUT CHATRGE  IS EQUIVALENT TO THAT OF ELECTRON.

HERE A ANTIPROTON IS DISPLAYED.

i was askin d name of dat antiproton...d answer is ANTIPROTON..MADMAX TOLD IT.....thanx all...

is there anti-neutron ?

The antiproton  is the antiparticle of the proton.

Antiprotons are stable, but they are typically short-lived since any collision with a proton will cause both particles to be annihilated in a burst of energy.

The existence of the antiproton with -1 electric charge, opposite to the +1 electric charge of the proton, was predicted by Paul Dirac in his 1933 Nobel Prize lecture

Dirac received the Nobel Prize for his previous 1928 publication of his Dirac Equation that predicted the existence of + and - solutions to the Energy Equation (E = mc^2) of Einstein and the existence of the antimatter positive charge electron (e+ positron), the spin opposite of the negative charge electron (e- negatron).

The antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquark and one down antiquark (uud). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception that the proton has opposite electric charge and magnetic moment than the proton. The question of ways matter is different from antimatter remains an open problem, in order to explain how our universe survived the Big Bang and why so little remains of antimatter today in our solar system.

Occurrence in nature

Antiprotons have been detected in cosmic rays for over 25 years, first by balloon-borne experiments and more recently by satellite-based detectors. The standard picture for their presence in cosmic rays is that they are produced in collisions of cosmic ray protons with nuclei in the interstellar medium, via the reaction, where A represents a nucleus:

p + A → p+ p +p+ A

The secondary antiprotons (p) then propagate through the galaxy, confined by the galactic magnetic fields. Their energy spectrum is modified by collisions with other atoms in the interstellar medium, and antiprotons can also be lost by "leaking out" of the galaxy.

The antiproton cosmic ray energy spectrum is now measured reliably and is consistent with this standard picture of antiproton production by cosmic ray collisions. This sets upper limits on the number of antiprotons that could be produced in exotic ways, such as from annihilation of supersymmetric dark matter particles in the galaxy or from the evaporation of primordial black holes. This also provides a lower limit on the antiproton lifetime of about 1-10 million years. Since the galactic storage time of antiprotons is about 10 million years, an intrinsic decay lifetime would modify the galactic residence time and distort the spectrum of cosmic ray antiprotons. This is significantly more stringent than the best laboratory measurements of the antiproton lifetime:

LEAR collaboration at CERN: 0.08 a

APEX collaboration at Fermilab: 50,000 yr for p → μ− + X and 300,000 yr for p → e− + γ

The properties of the antiproton are predicted by CPT symmetry to be exactly related to those of the proton. In particular, CPT symmetry predicts the mass and lifetime of the antiproton to be the same as those of the proton, and the electric charge and magnetic moment of the antiproton to be opposite in sign and equal in magnitude to those of the proton. CPT symmetry is a basic consequence of quantum field theory and no violations of it have ever been detected.