Fischer, U.

Konobeyev, A.Yu.

Pereslavtsev, P.E.

Konobeyev, A. Yu.

Pereslavtsev, P. E.

KITopen

JEFF/EFF Meeting 1 May 9-11, 2011 Improvement of modeling of triton energy distributions for reaction induced by nucleons at intermediate energies A.Yu. Konobeyev, U.Fischer, P.E.Pereslavtsev  JEFF/EFF Meeting 2 May 9-11, 2011  - to analyze available experimental energy distributions using the proposed method for the modeling of precompound triton emission Objectives - to get effective values of model parameters for  triton emission  - to consider the role of the optical potential on the calculated values of precompound triton energy distributions JEFF/EFF Meeting 3 May 9-11, 2011 Complex particle emission in pre-compound reactions   C.Kalbach-Cline (1972) :  “Extensions to the Pre-Equilibrium Statistical Model” criticized by Ribansky, Oblozinsky (1973), Kalbach (1977) Used: LAHET, MCNPX (all versions) 0 10 20 30 40 50 60 70 8010-310-210-1100101102 α-particle energy (MeV)Ep=72.3 MeV197Au(p,α)x  dσ/dε α (mb/MeV) Lewandowski Bertini/Dresner Bertini/ABLA ISABEL/Dresner ISABEL/ABLAJEFF/EFF Meeting 4 May 9-11, 2011   I.Ribansky, P.Oblozinsky (1973) :  “Emission of Complex Particles in the Exciton Model” criticized by Kalbach (1977), Iwamoto, Harada (1982)  Used: CEM (MCNPX) Triton energy (MeV) dσ/dE (mb/MeV) p+197Au, Ep=62 MeV coalescence model JEFF/EFF Meeting 5 May 9-11, 2011   G.M. Braga-Marcazzan, L.Milazzo-Colli (1972) :  “The preformation of α-particles in heavy nuclei” developed by Gadioli and coauthors to the middle 80th, Avrigeanu, Avrigeanu (90th), Blann (2009) Used: STAPRE-H, HMS, ALICE-2010 10 20 30 40 50 60 7010-210-1100101 Bertrand (73) INC (DISCA-C, KIT) GDH (ALICE/ASH, KIT)Knock-out + evaporationEp=61.9 MeV120Sn(p,α)x  dσ/dε (mb/MeV)α-particle energy (MeV)criticized by Gadioli et al (1986) knock-out model JEFF/EFF Meeting 6 May 9-11, 2011 C.Kalbach (1977) :  “The Griffin Model, Complex Particles and Direct Nuclear Reactions” developed by Kalbach (2005) Used: PRECO, GNASH, TALYS phenomenological approach           pick-up: d,t, 3He, α-particles, knock-out: α-particles  JEFF/EFF Meeting 7 May 9-11, 2011 A.Iwamoto, K.Harada (1982) :  “Mechanism of Cluster Emission in Nucleon-Induced Preequilibrium Reactions” Used: EMPIRE,  STAPRE (“ADL” version) pick-up - coalescence model Attempt to improve: Pronyaev and coauth (1994) Fl,m(εα) 0 20 40 60 80 10010-310-210-1100101totalevaporation Wu (79)Ep=90 MeV209Bi(p,α)x  dσ/dε (mb/MeV)α-particle energy (MeV)JEFF/EFF Meeting 8 May 9-11, 2011 E.Gadioli and co-authors (1986) :  Microscopic calculations of (n,α)x spectra using pick-up and knock-on theories Pick-up calculations provide a very satisfactory reproduction of the data. Knock-on calculations do not allow a fully satisfactory reproduction of them pick-up theory knock-on theory JEFF/EFF Meeting 9 May 9-11, 2011 S. Dimitrova, V Avrigeanu and coauthors (1997): (n,d)-Reactions on Medium Mass Nuclei“ knock-out pick-up equilibrium equilibrium pick-up knock-out JEFF/EFF Meeting 10 May 9-11, 2011 INPE, FZK (1994,1995) :  Modeling of pre-compound cluster emission using GDH The model was used to produce evaluated data files up to 50 MeV (1995) First succesfull attempt to describe α-particle spectra for nucleon induced reactions in a wide energy range of projectiles 0 20 40 60 80 10010-310-210-1100101102totalknock-outpick-upevaporation Wu (79)Ep=90 MeV27Al(p,α)x  dσ/dε (mb/MeV)α-particle energy (MeV)α-particles: pick-up + knock-out d,t,3He: pick-up (IHS) JEFF/EFF Meeting 11 May 9-11, 2011 Development (FZK, KIT) α-particles: improvement (2004) deuterons:  essential changes and improvements (2005) tritons:        changes and improvement (2011) nucleon pick-up:  middle part of emission spectra. Dominant at relative low projectile energies knock-out:  high energy part of emission spectra. The contribution grows with the increase of projectile energy  coalescence:  dominates at high energy of projectiles (INC) direct processes:  the highest part of emission spectra Main features of cluster emission: JEFF/EFF Meeting 12 May 9-11, 2011 0 5 10 15 20 25 30 35 40 45 50 55 6010-210-1100 Bertrand, Peelle (73)  Ep=61.7 MeV209Bi(p,x)t TALYS-1.2 (Kalbach) ALICE/ASH (IHS) HMS (knock-out)Triton energy (MeV)  0 5 10 15 20 25 30 35 40 45 5010-210-1100 Bertrand, Peelle (73)  Ep=61.7 MeV27Al(p,x)t TALYS-1.2 (Kalbach) ALICE/ASH (IHS) HMS (knock-out)Triton energy (MeV)dσ/dε t (mb/MeV)  Triton energy distributions calculated using modern codes JEFF/EFF Meeting 13 May 9-11, 2011 Precompound triton emission in nucleon induced reaction P U,C K O Dt t t td d d dd d d d− −σ σ σ σ= + +ε ε ε εPick-up and coalescence 0eP U,Ct tnon 0 k,m t t ten n k m 3t t t t t( )d (p k,h,U)(E ) F ( Q ) g D(n)d (p,h,E) ( ) ( )−+= + =λ εσ ω −=σ ε +ε ω λ ε + λ ε∑ ∑inve t t t t tt 2 3t(2S 1) ( )g+ µ ε σ ελ =π optt t2W /+λ = JEFF/EFF Meeting 14 May 9-11, 2011 Knock-out 0eK Ot tnon 0 t 0 ten nt t t t t t( )d g (p 1,h,U)(E ) (E ) g D(n)d g p (p,h,E) ( ) ( )−+=λ εσ ω −=σ Φε ω λ ε + λ ε∑t xt 0txp 0 xn 0 t xt 0(E )F Z' (A ' Z ')(E ) (E ) (E ) YA ' A 'ϕ σ=−σ + σ + ϕ σ + 0 50 100 150 200 250 3000,00,10,20,30,40,50,60,70,8  σ xd/(σ xn+σ xp)Nucleon energy (MeV) free scattering EF=32 MeVt 0 t 0(E ) 2 F (E )Φ =JEFF/EFF Meeting 15 May 9-11, 2011 .  Direct pick-up process eDt dnon tet t t t t( )d * (U) gd (1p,0h,E) ( ) ( )+λ εσ ω=σε ω λ ε + λ εe2Dt t2 Fnon 1 t2 et 3 F t t t t( )(E E )d exp gd 2( E ) ( ) ( )+  λ ε− ασ=σ α − ε α λ ε + λ ε The old approach:  ω*(U)= ω(0p,1h,U)⋅γ/g  Multiple pre-equilibrium emission maxxmin 0xEF U,C e222 x x x xl n x el 0 x , n nt x x x xEex x t t t tk,m t t t 2en ' p h 1 k m 3 x x t t t td (p 1,h,E Q ) ( )(2l 1)T X g D(n)d (p,h,E) ( ) ( )(p ' k,h',E Q Q' ) ( )F ( Q ') g D(p',h',E Q ) ( ) ( )− ∞+= =π ν =+= + − + =σ ω − − − ε λ ε= π +ε ω λ ε + λ εω − − − ε − − ε λ ε× ε +ω − − ε λ ε + λ ε∑ ∑ ∑∫∑ ∑x(n') dεJEFF/EFF Meeting 16 May 9-11, 2011 .  Experimental data (p,x)t reactions:  targets:   C-12, Al-27,  Si-0,  Fe-54,  Fe-56,  Ni-58,  Y-89,  Zr-90,  Sn-120,  Au-197,                      Pb-208,  Bi-209 proton energy:   26.5 – 90 MeV F.E.Bertrand, R.W.Peelle,  PRC,8,1045 (1973) P.Demetriou et al, PRC,72, 034607 (2005) A.Guertin et al,   EPJA,23,49 (2005)               J.R. Wu et al,  PRC, 19, 698 (1979) S.Benck et al, PRC,58,1558 (1998);  AND,72,1 (1999);  NSE,141,55 (2002) V.Blideanu et al, PRC,70,014607 (2004) N.Nica et al, JPG,28,2823 (2002) E.Raeymackers et al,  NPA,726,210 (2003) I.Slypen et al,  AND,76,26 (2000) U.Tippawan et al,  PRC,69,064609 (2004);  PRC,79,064611 (2009) (n,x)t reactions:  targets:   C-12, O-16, Al-27, Si-00, Fe-56, Co-59, Pb-208, Bi-209 neutron energy:   31.5 – 95.6 MeV JEFF/EFF Meeting 17 May 9-11, 2011 Model parameters k,m tk m 3F ( ) 0.3+ =ε =∑nucleon pick-up t-knock-out Becchetti-Greenlees:   Wtopt = 46 – 0.33 E – 110 (N-Z)/A absorption 0 25 50 75 100 125 150 175 2000,000,020,040,060,080,10  Aϕ t   Ep=62 MeVJEFF/EFF Meeting 18 May 9-11, 2011 Contributions 0 5 10 15 20 25 30 35 40 45 5010-410-310-210-1100101K-O F(1,2)F(2,1)EQF(3,0) D Bertrand, Peelle (73)  Ep=61.5 MeV54Fe(p,x)ttriton energy (MeV)dσ/dε t (mb/MeV)  TOTALJEFF/EFF Meeting 19 May 9-11, 2011 0 2 4 6 8 10 12 14 16 18 20 22 2410-310-210-1100101 Bertrand, Peelle (73)  Ep=28.8 MeV120Sn(p,x)t new approach Kalbach eq emissiontriton energy (MeV)dσ/dε t (mb/MeV)  6 8 10 12 14 16 18 20 22 2410-310-210-1100101 Bertrand, Peelle (73)  Ep=28.8 MeV197Au(p,x)t new approach Klabach eq emissionTriton energy (MeV)  Examples.  Calculations using ALICE/ASH (2011) JEFF/EFF Meeting 20 May 9-11, 2011 0 5 10 15 20 25 30 35 4010-210-1100  Bertrand, Peelle (73)  Ep=61.9 MeV12C(p,x)t new approach Kalbach eq emissiondσ/dε t (mb/MeV)  0 5 10 15 20 25 30 35 40 45 5010-210-1100 Bertrand, Peelle (73)  Ep=61.7 MeV27Al(p,x)t new approach Kalbach eq emission  0 5 10 15 20 25 30 35 40 4510-210-1100 Demetriou (05) ( natSi)  Ep=62.9 MeV28Si(p,x)t new approach Kalbach eq emissionTriton energy (MeV)dσ/dε t (mb/MeV)  0 5 10 15 20 25 30 35 40 45 5010-210-1100 Bertrand, Peelle (73)  Ep=61.5 MeV54Fe(p,x)t new approach Kalbach eq emissiontriton energy (MeV)dσ/dε t (mb/MeV)  JEFF/EFF Meeting 21 May 9-11, 2011 0 10 20 30 40 5010-210-1100 Bertrand, Peelle (73)  Ep=61.5 MeV89Y(p,x)t new approach Kalbach eq emissiondσ/dε t (mb/MeV)  0 10 20 30 40 50 6010-210-1100  Bertrand, Peelle (73)  Ep=61.5 MeV120Sn(p,x)t new approach Kalbach eq emission  0 10 20 30 40 50 6010-210-1100 Bertrand, Peelle (73)  Ep=61.5 MeV197Au(p,x)t new approach Kalbach eq emissionTriton energy (MeV)dσ/dε t (mb/MeV)  0 10 20 30 40 50 6010-210-1100 Guertin (05)  Ep=62.9 MeV208Pb(p,x)t new approach Kalbach eq emissionTriton energy (MeV)  JEFF/EFF Meeting 22 May 9-11, 2011 0 10 20 30 40 50 60 70 8010-310-210-1100 Wu (79)  Ep=90 MeV27Al(p,x)t new approach Kalbach eq emissiondσ/dε t (mb/MeV)  0 10 20 30 40 50 60 70 8010-310-210-1100 Wu (79)  Ep=90 MeV58Ni(p,x)t new approach Kalbach eq emission  0 10 20 30 40 50 60 70 8010-310-210-1100 Wu (79)  Ep=90 MeV90Zr(p,x)t new approach Kalbach eq emissionTriton energy (MeV)dσ/dε t (mb/MeV)  0 10 20 30 40 50 60 70 80 9010-310-210-1100101 Wu (79)  Ep=90 MeV209Bi(p,x)t new approach Kalbach eq emissionTriton energy (MeV)  JEFF/EFF Meeting 23 May 9-11, 2011 0 10 20 30 40 50 60 70 8010-210-1100  Tippawan (09)  En=95.6 MeV12C(n,x)t new approach Kalbach eq emissionTriton energy (MeV)dσ/dε t (mb/MeV)  0 5 10 15 20 25 30 35 40 45 5010-210-1100  Benck (02) (natSi)  En=62.7 MeV28Si(n,x)tTriton energy (MeV)  0 10 20 30 40 50 60 70 80 9010-310-210-1100 Tippawan (04) (natSi)  En=95.6 MeV28Si(n,x)tTriton energy (MeV)  0 5 10 15 20 25 30 35 40 45 50 5510-210-1100  Slypen (04) (natFe)  En=62.7 MeV56Fe(n,x)tTriton energy (MeV)dσ/dε t (mb/MeV)  0 10 20 30 40 50 60 70 80 9010-310-210-1100 Blideanu (04)   En=96 MeV56Fe(n,x)tTriton energy (MeV)  0 10 20 30 40 50 60 70 80 9010-210-1100101 Blideanu (04)  En=95 MeV208Pb(n,x)tTriton energy (MeV)  JEFF/EFF Meeting 24 May 9-11, 2011 F.D.Becchetti, G.W.Greenlees:  Wtopt = 46 – 0.33 E – 110 ξ  Xiaohua Li et al:                          Wtopt = 7.38 + 0.5 E – 0.0097 E2  D.Y. Pang et al:                           Wtopt = 38.5 [1 + exp(156-(E-EC))/52.4)]-1 P.Pereslavtsev:                           Wtopt = W0 [1 - exp(-εWE)](1+αWE)                                                              W0 =24.5 + 5.13 ξ,  εW=0.0978+0.425 ξ                                                              αW=-0.002+0.00159 ξ,  ξ = (N-Z)/A  The role of the optical potential JEFF/EFF Meeting 25 May 9-11, 2011 0 10 20 30 40 50 60 70 80 9010-210-1100101 Blideanu (04)  En=95 MeV208Pb(n,x)t OM: Becchetti-Greenlees   OM: Li OM: Pang eq emissionTriton energy (MeV)dσ/dε t (mb/MeV)  JEFF/EFF Meeting 26 May 9-11, 2011 0 10 20 30 40 50 60 70 8010-210-1100  OM: Becchetti-Greenlees  OM: Li OM: Pang OM: Pereslavtsev eq emission Wu (79)  Ep=90 MeV27Al(p,x)tTriton energy (MeV)dσ/dε t (mb/MeV)  Promising:  P.Pereslavtsev  OMP  JEFF/EFF Meeting 27 May 9-11, 2011 New analysis using  P.Pereslavtsev OP   Implementation in TALYS (version ?)   Plans:  JEFF/EFF Meeting 28 May 9-11, 2011 Conclusion Experimental triton energy distributions were analyzed using the proposed calculation method  The first results show the definite improvement of the modeling of triton spectra in nucleon induced reactions at intermediate energies  The module implemented now in ALICE/ASH should  be added after the modification to TALYS 

Improvement of modeling of triton energy distributions for reaction induced by nucleons at intermediate energies

https://publikationen.bibliothek.kit.edu/230092261/3816335

Improvement of modeling of triton energy distributions for reaction induced by nucleons at intermediate energies

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