Nuclear Fission Study with Neutron Beam at JYFL
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1 Nulear Fission Study with Neutron Beam at JYFL V.. Rubhenya For ollaboration: Jyväskylä - Usala - St. Petersburg rti FIDIPRO-FS Worksho Saariselkä ril
2 CONTNTS 1. Motivations Nulear Fission Physis. Prodution of Neutron-rih Nulides. Nulear Data for GN-IV. 2. Future Neutron Beams at JYFL 12 C(d nx 7 Li( n 238 U(d nx Heavy water (D 2 O+ d 3. xeriments Indeendent Fission Produt Yields (JYFLTRP. Fragment Mass-nergy Distributions (MFGIC TOF- Setrometer Nulear Data for Minor tinides (m Cm
3 LXX Years with Nulear Fission Uber den Nahweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden rdalkalimetalle. Von O. HHN and F. STRSSMNN Berlin-Dahlem. Die Naturwissenshaften 27 ( (Published 6. I Disintegration of Uranium by Neutrons: a New Tye of Nulear Reation LIS MITNR & O. R. FRISCH Nature (Published
4 n Pre-omound stage Pre-saddle evaoration Saddle oint d e s Desent from saddle Sission Post-sission evaoration 10-8 Fission roduts Time/ s Y( W(Θ F kin M n ( n Θ n M ( Θ M γ ( γ Θ γ Y( LCP LCP
5 fission X t t ( t t ind t t f d d dy ( ( ( ( ( ( ( n P P n Y Y nmd n n re ind ( re n Y ( P n ( n P nmd Fission rodut formation ross setionin reation FiProDy ode Indeendent yield: is a re-neutron emission yield of the fission fragment isobari hain is a harge distribution of the rimary isobari hain is a romt neutron multiliity distribution
6 Pre-omound stage ( ( 1 ( 2 ( 3 2 h h B h h d h h dw inv x x s ( ( 1 ( 2 ( 3 2 h h B h h d h h dw inv x x s We use the two-omonent exiton model for our objetive: an adequate desrition of the initial exitation energy distribution and omosition of the omound nulei in the neutron and roton indued fission at the inident energy from 10 to 100 MeV ( em em h h The lifetime of exiton state ( h h The roton re-omound single setra from given exiton state The neutron re-omound single setra from given exiton state
7 The main dynamial effets 1. Pre-omound artile emission: M n re-eq M re-eq re-eq elased 2. Role of the nulear frition in the fission: - delay time for formation of fission degree of freedom - modifiation of the fission width - overdamed olletive motion on the desent from saddle - M n re-s M re-s elased re-s 3. Charge olarization during the desent from sadlle to sission: harge distribution for isobari hains: Y(/ 4. Cometion between different fission modes as funtion of omosition and exitation energy of omound nulei: Y( * om 5. Distribution of exitation energy between fragments: M n ( * om 6. Shell struture for very deformed nulei: shell orretions fission barriers mass arameters fission modes level density
8 Frozen quantal flutuatuations in the harge equlibration mode Time evolution of isobari width in the harmoni aroximation 06 V ( V ( C ( 2 (/ 04 adiabati solution freeze-out oint M 16 9 r 3 0 m 2 N L 2r r nek 2 nek nek 02 dr nek /dt =2 fm/(10-21s sission time ( 2 M C 1 2 C GDR time s
9 fragment harge number shell orretions at sission oint 239 N fragment mass number
10 242 Cm s. deay He(* Pu(* Ternary Fission yield / fission Be C O Ne Mg Si SF luster deay (? fragment mass number
11
12 Comarison with IGISOL-TRP data in 238 U( f at =25 MeV ross setion mb mass number r ross setion mb Mo mass number ross setion mb mass number Sn ross setion mb Cs mass number
13 = = = = Cm 249 Cf 239 Pu 238 N 243 m 235 U 245 Cm 241 Pu 247 Cm N om / om mean (
14 V ot for 248 Cm -> 78 Ni r Ni deformation heavy fragment deformation
15 40 30 = U 250 U 260 U 20 V s.. MeV
16 yield ( % Ni in n th fission 243 Cm 245 Cm 247 Cm rodut mass number
17 The Generation IV International Forum was set u to oordinate R&D of new nulear reator onets xerimental aabilities and and exertise are of umost imortane for the sustainability of Nulear nergy
18 12 C(dnX neutron rodution MCNPX alulations at d = 15 MeV I d = 50 μ Neutron Setrum =15 MeV dn/d 1/0.25 MeV MCNPX d 12 C 1 m Target Ø5 m nergy MeV
19 7 Li(n 7 Be neutron rodution xerimental neutron setrum measured at CYCLON ylotron (LLN Proton energy 36.4 MeV 7 Li target thikness 5 mm Current 10 μ Neutron eak energy 32.9 MeV Total flux is ~ n m -2 s -1 at the distane 0.5 m from the Li target
20 Target assembly for the neutron rodution
21 238 U(dnX neutron rodution ngle integrated neutron setra 238 U (d f at d =15 MeV re-omound re-sission ost-sission total -5.7 neutron multiliity neutron energy MeV
22 JYFLTRP- a trile tra setu beam from IGISOL Setrosoy station Twin Penning tra 7T sueronduting solenoid 1. Purifiation tra 2. Preision tra = (q/m(b/2. Nieminen et al. Phys. Rev. Lett. 88( S. Rinta-ntila et al. Phys. Rev. C 70(
23 The ion guide set-u. 1. deuteron beam; g/m2 arbon onverter target; mm iron; 4. helium-filled ion guide target hamber; U target (15 mg/m 2 ; 6. helium inlet; 7. exit-hole (1.2 mm 8. skimmer late with 1.35 mm hole.
24 Calulated fission rodut yields n =50 MeV 238 U(n f mb mb n = 5 MeV N N
25 Ni indeendent formation ross setion (mb in n- - and d-indued fission of 238 U Ni ross setion mb Ni yields in 238 U fission by n (5 MeV (30 MeV d (15 MeV mass number
26 Ru indeendent formation ross setion (mb in n- - and d-indued fission of 238 U ross setion mb Ru yields in 238 U fission by n (5 MeV (30 MeV d (15 MeV mass number
27 Pd indeendent formation ross setion (mb in n- - and d-indued fission of 238 U ross setion mb Pd yields in 238 U fission by n (5 MeV (30 MeV d (15 MeV mass number
28 multi-setion Frish-gridded ionization hamber (MFGIC For 7 fissile targets: Y(А 2- method ( 3-4 a.e.m dn f /dω olar angle θ (os θ 0.02 ( 0.5 MeV dn f /d δt 2.5 ns (FWHM Sensitivity ( 238 U m 2
29 Results (MFGIC
30 Thin entrane window Vauum hamber Neutron beam PPC ( sto TOF- setrometer Thin entrane window U-target Th-target PPC ( start Bragg-PPC hamber
31 TOF- setrometer
32 Partiiants Jyväskylä Usala S. Petersburg J. Äystö R. Bevilaqua I.V. Ryzhov. Jokinen J. Blomgren V.. Rubhenya H. Penttilä S. Pom G.. Tutin &.V. Prokofiev M.S. Onegin IGISOL grou V.D. Simutkin
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