# How is Alpha Particle Energy Defined in MCNP6?

TL;DR Summary
Hello everyone here,

I do need your help in this matter, please kindly help me solve this problem. I am new to this forum and now am seeking for help.

I'm new to MCNP code, and I ran the MCNP6 code with particle alpha mode a and 'phys:a'. Where the default energy is 100 MeV. if I want to use more than 250 MeV energy, How do I arrange it?
How to determine the maximum energy in mcnp6?

thanks
15- mode a
16- m1 1000. -0.111894 $MAT1 17- 8000. -0.888106 18- m2 6000. -0.000124$MAT2
19- 7000. -0.755268 8000. -0.231781 18000. -0.012827
20- imp:a 1 3r 0 \$ 1, 5
21- phys:a 250
22- sdef pos 5 0 0 axs=1 0 0 ext=-8 rad=d1 par=34 erg=250 vec=1 0 0 dir=1
warning. ext is constant. in most problems it is a variable.
23- si1 1 5
24- sp1 -21 1
25- f6:a 3 2
26- nps 1000

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