Neutrons For Science

Transcription

1 Neutrons For Science NFS is one of the two facilities of the LINAG Experimental Area se of the LINAG s beams to produce neutrons between 1 and 40 MeV The NFS is composed of : - A neutron beam in a Time-Of-Flight area - An irradiation box (p, d, HI and n induced reactions) - An irradiation cell for interdisciplinary research at SPIRAL-2 Physics case - Fission reactors of new generation - Fusion technology - Studies related to hybrid reactors (ADS) - Basic data for evaluated data bases - Nuclear medicine and biology - Development and characterization of new detectors - Study of the single-event upsets

2 Neutron spectra provided at NFS Characteristics of the beams the LINAG : - 40 MeV deuteron and 33 MeV proton - I max = 5 ma - lsed beam F 0 = 88 MHz T=11 ns Burst width = 200 ps I < 50 µa P < 2 kw WNR : Los Alamos N-tof : CERN GELINA : Geel Complementary to the existing facilities

3 Neutron induced fission Need of data for fast neutron essentially for minor actinides ADS, GEN IV reactors Cross-section measurements Neutron, gamma multiplicity and spectra Fragment yields Active target loaded with actinide Isotopes usable at NFS 232 Th Np 238 NFS short flight path High flux Small samples (a emitters) Coincidence measurements Complementary to surrogate reactions Limited to 10 MeV Model dependence Maximal activity 1 GBq for thin sample 10 GBq for thick target FALSTAFF Am 242 Am 243 Am 245 Cm Cm 247 Cm Study of the fission process Continuous spectrum continuous excitation energy Coincidence experiment (A,Z) fragment distribution 248 Cm 231 Pa Cf 251 Cf

4 (n,x) cross section measurements (n,xn) reactions Maximum s in the NFS energy range Neutron multiplication In-beam g-ray spectroscopy White source and quasi-monokinetic spectrum (n,2n), (n,np), (n,a) reactions se of large Ge array for g-g coincidence measurements (n,lcp) Gazes and default production Energy deposition in therapy Composite particle prediction no model works Double differential measurements (n,xn), (n,lcp) Few data exits between 20 and 50 MeV se of existing detection set-ups

5 Cross Section, b Cross-section measurement needed for fusion technology Cross-section measurement by activation technique 2 irradiation stations : - Neutron induced reactions - Proton and deuteron I max limited to 50 ma - Power deposition on converter < 2 kw - Reduced activation «easy» sample manipulation IFMIF : International Fusion Material Irradiation Facility needs neutron and deuteron induced reactions cross-section for flux monitoring and activation evaluation. - Data scarce or not existing - Large discrepancies between data base Ditroy'00 93 Nb(d,2n) 93m Mo EAF Material to be studied for IFMIF : Al, Fe, Cr, Cu, Nb for cavities and beam transport elements Be, C, O, N, Na, K, S, Ca, Fe, Cr, Ni for Li loop Ditroi'00_Sig EAF20051_Nb93d2nMo92m Deuteron Energy, MeV

6 Letters of Intents for Day-One experiments at NFS Neutron induced reactions studies : LoI_13 : Study of pre-equilibrium process in (n,xn) reaction, X. Ledoux LoI_14 : Comparison between activation and prompt spectroscopy as means of (n,xn) cross section measurements, M. Kerveno LoI_20 : Direct measurement of (n,xn) reaction cross sections on 239, G. Bélier LoI_21 : Light-ion production studies with Medley, S. Pomp Fission : LoI_15 : Fission fragment distributions and neutron multiplicities, D. Doré LoI_22 : Fission fragment angular distribution and fission cross section measurements relative to elastic np scattering with Medley, S. Pomp LoI_28 : Study of the fission process and fission cross-section measurements, G. Bélier LoI_12 : Fragment angular distributions in neutron-induced fission of actinide nuclei, L. Tassan-Got LoI_19 : se of the STEFF spectrometer at NFS, G. Smith Cross-section reaction measurements by activation technique : LoI_16 : Proton and deuteron induced activation reactions, P. Bem LoI_24 : Neutron-induced activations reactions, A. Klix Biology : LoI_23 : Response of Mammalian cells to neutron exposure, C. Hellweg Detector development : LoI_29 : Neutron spectrometer characterization for LMJ project, B. Rossé

7 Budget and planning Infrastructures : SPIRAL-2 and ppsala niversity - building 1500 k - equipment 1600 k Process : NFS partners (Mo for construction) - capital investment : 523 k - Human resources : 2662 k Partners Investment (k ) GANIL, Caen 1011 CEA/DAM/DIF, Arpajon 725 CEA/DSM/Irfu, Saclay, 572 IN 2 P 3, France 572 CEA/DEN, Cadarache, 60 NPI, Řež, Czech 90 ppsala niversity, 50 KIT, Karlsruhe 107

8 NFS vs CHANDA Needs of NFS : Transnational access Container for highly radioactive targets Adaptation of existing detectors for the manipulation of actinides Post-doctoral position for commissioning Contributions of NFS to CHANDA: Fission studies - Xs, fragment yield,, Eg - Actinide targets (n,xn), (n,n g), (n,lcp) reactions - Collimated beam - High flux and high energy resolution