Stopping power means simply the energy lost on traversing a unit distacne in the medium.

Mass stopping power means the energy lost by the radiation in traversing a unit distince per unit density.

It is higher for water because the probability for interaction is more for hidrogen

Ch. 8 of Introduction to Radiological Physics and Radiation Dosimetry by Frank Attix does a good job of explaining stopping power and mass stopping power. The mass stopping power is dependent on properties of both the incident particle and the medium. The mass stopping power is directly proportional to the atomic number of the medium and the square of the charge of the incident particle, and inversely proportional to the atomic mass of the medium and the square of the beta value of the incident particle.

Dear All

In high energy heavy ion collisions, we used some model, so that by using a relativistic transport model, we study the stopping power for the formation of super dense hadronic matter as well as the strength of transverse and radial flow in such collisions at ultra-relativistic energy..

dear Dr Mohamed

I think the main deference between the stopping power and mass stopping the density of the materials

dear Dr. Mohamed. stopping power is not for the formation of super dense model. I think you are highly confused???????

S toping power is the energy lost by charged particle completely when it traversing ,in a medium per unit length.Which is dependent on the density of the medium,if the density is more loss of energy of the charge particle is more,if density is less lose of energy of the charged particle is less.So to make it as independent of density we are defining mass stopping power.It is nothing but stopping power /density of the medium.

The mass stopping power of a material is obtained by dividing the stopping

power by the density ρ. Common units for mass stopping power, -dE/ρdx, are MeV cm2 g-1.