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68 lines
2.5 KiB
Python
68 lines
2.5 KiB
Python
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#!/usr/bin/env python3
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from NucData import Masses
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import numpy as np
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class Nucleus:
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def __init__(self, z, a):
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self.Z = z
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self.A = a
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self.Symbol = Masses.GetSymbol(self.Z, self.A)
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self.GSMass = Masses.GetMass(self.Z, self.A)
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def Minus(self, rhs):
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final_Z = self.Z - rhs.Z
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final_A = self.A - rhs.A
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if final_A < 0 or final_Z < 0:
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print("Illegal minus operation on Nuclei!")
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return Nucleus(0,0)
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else:
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return Nucleus(final_Z, final_A)
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def Plus(self, rhs):
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return Nucleus(self.Z + rhs.Z, self.A + rhs.A)
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class Reaction:
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DEG2RAD = np.pi/180.0 #degrees to radians
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C = 299792458 #speed of light m/s
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QBRHO2P = 1.0E-9*C #Converts qbrho to p (kG*cm -> MeV/c)
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DISP = 1.96
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MAG = 0.39
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def __init__(self, zt, at, zp, ap, ze, ae, beamKE, theta, bfield):
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self.Target = Nucleus(zt, at)
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self.Projectile = Nucleus(zp, ap)
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self.Ejectile = Nucleus(ze, ae)
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self.Residual = (self.Target.Plus(self.Projectile)).Minus(self.Ejectile)
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self.BKE = beamKE
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self.Theta = theta * self.DEG2RAD
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self.Bfield = bfield
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self.Name = self.Target.Symbol +"("+ self.Projectile.Symbol +","+ self.Ejectile.Symbol +")"+ self.Residual.Symbol
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def GetEjectileKineticEnergy(self, Elevel) :
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Q = self.Target.GSMass + self.Projectile.GSMass - (self.Ejectile.GSMass + self.Residual.GSMass + Elevel)
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Ethresh = -Q*(self.Ejectile.GSMass+self.Residual.GSMass)/(self.Ejectile.GSMass + self.Residual.GSMass - self.Projectile.GSMass)
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if self.BKE < Ethresh:
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return 0.0
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term1 = np.sqrt(self.Projectile.GSMass*self.Ejectile.GSMass*self.BKE)/(self.Ejectile.GSMass + self.Residual.GSMass)*np.cos(self.Theta)
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term2 = (self.BKE*(self.Residual.GSMass - self.Projectile.GSMass) + self.Residual.GSMass*Q)/(self.Ejectile.GSMass + self.Residual.GSMass)
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ke1 = term1 + np.sqrt(term1**2.0 + term2)
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ke2 = term1 - np.sqrt(term1**2.0 + term2)
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if ke1 > 0:
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return ke1**2.0
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else :
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return ke2**2.0
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def GetFocalPlaneZOffset(self):
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ejectKE = self.GetEjectileKineticEnergy(0.0)
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ejectP = np.sqrt(ejectKE**2.0 + 2.0*ejectKE*self.Ejectile.GSMass)
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rho = ejectP/(self.QBRHO2P*self.Bfield*self.Ejectile.Z)
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K = np.sqrt(self.Projectile.GSMass*self.Ejectile.GSMass*self.BKE/ejectKE)*np.sin(self.Theta)
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K /= self.Ejectile.GSMass + self.Residual.GSMass - np.sqrt(self.Projectile.GSMass*self.Ejectile.GSMass*self.BKE/ejectKE)*np.cos(self.Theta)
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return -1.0*K*rho*self.DISP*self.MAG
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def ChangeReactionParameters(self, bke, theta, bfield) :
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self.BKE = bke
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self.Theta = theta*self.DEG2RAD
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self.Bfield = bfield
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