Anti-matter Ion Cosmic Rays An international consortium is presently building a device to look for anti-matter nuclei in cosmic rays to help us decide whether there are galaxies made of anti-matter. Anti-matter is just like ordinary matter except the basic particles (anti-protons and anti-electrons) have opposite charge from ordinary matter counterparts. Anti-protons are negative, and anti-electrons (positrons) are positive.
A schematic of the device is shown in Fig. $29-42 .$ A cosmic ray-say, a carbon nucleus or an anti-carbon nucleus-enters the device at the left where its position and velocity are measured. It then passes through a (reasonably uniform) magnetic field. Its path is bent in one direction if its charge is positive and in the opposite direction it its charge is negative. Its deflection is measured as it goes out of the device.
(a) In Fig. $29-42$, what is the direction of the magnetic field? How do you know?
(b) Which path is followed by each particle in the device? How do you know?
(c) If you were given the magnetic field, $B$, the size of the device,
$D$, the amount of charge on the incoming particle, $q$, and the mass of the incoming particle, $M$, would this be enough to calculate the displacement of the charge, $d ?$ If so, describe briefly how you would
do it (but don't do it). If not, explain what additional information you would need (but don't estimate it).