C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 The n_TOF Collaboration, www.cern.ch/nTOFwww.cern.ch/nTOF Summary of n_TOF measurements performed.

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Presentation transcript:

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 The n_TOF Collaboration, Summary of n_TOF measurements performed in 2012 (CERN 44 th INTC meeting, June 26 th 2013) Carlos GUERRERO (CERN Fellow) n_TOF Run and Analysis Coordinator

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 FF Ang. Distribution 237 Np, 234,235,238 U Fission 240,242 Pu, 235 U Neutron capture 25 Mg, 88 Sr, 93 Zr, 235 U (n,chp) 10 B, 27 Al, 33 S, 59 Ni, Nuclear AstrophysicsNuclear technologiesMedical applications n_TOF measurements in 2012 PPACMGASTACC6D6C6D6 sCVD diamond Basic Nucl. Phys. […]

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Cross sections for Nuclear Technology

C. Guerrero 44 th INTC Meeting at CERN, June 26 th % 238 U Fuel (LWR) 94% 238 U Spent fuel 1% 235 U 1% Pu & MA 4% Fission products 3% 235 U 96% potential fuel New nuclear reactor concepts: a)Gen-IV: Fast reactors that can operate with fuels including U, Pu and MA b)ADS (Accelerator Driven Systems): dedicated nuclear waste burners Cross sections for Nuclear Technology New fuels composition and different neutron energy regime call for new reactions, whose cross sections are not known with the required accuracy.

C. Guerrero 44 th INTC Meeting at CERN, June 26 th Pu 238 Pu % 239 Pu % 240 Pu % 241 Pu % 242 Pu % 244 Pu % Mass3.0mg Activity0.13 MBq Also spontaneous fission!! A. Tsinganis (PhD) CERN (CH) & NTUA (Greece)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 With only 30% of the statistics analyzed, the 242 Pu data look promising, both in the RRR and the high energy region, up to at least 200 MeV! A. Tsinganis (PhD) CERN (CH) & NTUA (Greece)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 neutrons MGAS with U samples MGAS signals BaF 2 module J. Balibrea (PhD) CIEMAT (ES) and CERN (CH)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 J. Balibrea (PhD) CIEMAT (ES) and CERN (CH) Capture dominated resonances High fission contribution VERY PELIMINARY

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Cross sections for Astrophysics (nucleosynthesis of elements)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Nuclear reactions: energy generation nucleosynthesis condensation ejection, explosion interstellar gas & dust Mixing (abundance distribution) Chemical elements beyond Iron are synthesized via neutron capture reactions in stars: ~ ½ by the s-process (red giants) ~ ½ by the r-process (explosive) Fusion reactions Neutron capture reactions Cross sections for Astrophysics (nucleosynthesis of elements)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Sample from ORNL (USA): 205±5  g LiF: 95% 6 Li (thickness = 394 nm) 180±5  g metallic Ni: 95% 59 Ni => 516 kBq ReactionParticleE max [MeV] 59 Ni(n,  ) 56 Fe  Ni(n,p) 59 Cop Li(n,  )t  Li(n,  t t2.73 Lowest mass measured at n_TOF to date! C. Weiss (PhD) CERN (CH) and TUW (AUSTRIA)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 New development Array of 9 sCVD diamond diodes: 1.Thickness: 150  m 2.Detector size 5x5 mm 2 (each) 3.Electrodes: 200 nm Al Neutrons Vacuum Chamber Spectroscopic amplifiers Cross section measurement Neutron Fluence Measurement CIVIDEC C. Weiss (PhD) CERN (CH) and TUW (AUSTRIA)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 “Main component” 22 Ne( ,n) 25 Mg is a neutron source in AGB stars: 1M sun < M < 3M sun – kT=8 keV and kT=25 keV “Weak component” 22 Ne( ,n) 25 Mg is the main neutron source in massive stars: M > 10 – 12M sun – kT=25 keV and kT=90 keV The s-process and 25 Mg: a neutron poison! 22 Ne( ,n) 25 Mg is a neutron source in AGB stars and the main one in massive stars, subsequently 25 Mg becomes a neutron poison trough the 25 Mg(n,  ) reaction C. Massimi INFN (IT) and U. Bologna (IT)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th Ne( ,n) 25 Mg is a neutron source in AGB stars and the main one in massive stars, subsequently 25 Mg becomes a neutron poison trough the 25 Mg(n,  ) reaction The measurement on 2003 suffered from some uncertainties that now have been highly reduced by 1.Using a highly pure metallic sample 2.Measuring both capture and total cross sections 3.Using the upgrade n_TOF facility (highly reduced  -background since 2010) C. Massimi INFN (IT) and U. Bologna (IT)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 G. Tagliente INFN-Bari (IT) G. Tagliente et al., Phys. Rev. C 87, (2013) “The 93 Zr(n,γ) reaction up to 8 keV neutron energy” Thanks to the availability of a Type A experimental area (since 2010) the measurement has been repeated: -Absence of Al+Ti capsule -Lower in-beam  -ray background Both result in lower background, and thus: -Better accuracy -Higher neutron energy limit Limitations: -Al+Ti capsule because of sample activity -High in-beam  -ray background

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Cross sections for Medical Physics (Neutron Capture Therapy)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th S as a cooperative target for NCT 33 S(n,  ) 30 Si 10 B(n,  ) 7 Li E   3.1 MeV E Li  0.84 MeV E   1.47 MeV LET  126 keV/  m (optimal value ~100) LET(Li)=162 keV/  m LET(  )=196 keV/  m x   15  m x Li  5  m x   8  m E n  13 keV ->  (n,  )  20 barns? E n ~eV ->  (n,  )  3840 b E n ~keV ->  (n,  )  5 b No gamma E   0.48 MeV I. Porras, Phys. Med. Biol. 53 (2008) M. Sabate and J. Praena U. Sevilla (ES) and CERN (CH)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Measurement carried out in November-December MGAS detectors with 10 samples back-to-back: 33 S thin (x4), 33 S thick (x2), blanks (x2), 10 B (x2) [samples prepared at CERN by W. Vollenberg] 33 S 10 B 33 S Blank (n,  ) 13 keV and beyond M. Sabate and J. Praena U. Sevilla (ES) and CERN (CH)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Basic Nuclear Physics

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 F. Gunsing CEA-Saclay (FR) Pilot experiment to measure spin-dependent level densities in 87 Sr with BaF 2 TAC by: Exploit gamma-ray spectra from decay from resonance state gamma-ray multiplicity spectra primary gamma-rays (presence, angular distribution) 87 Sr has J π = 9/2+ l=0: J π =4 + or 5 + l=1: J π = 3 –, 4 –, 5 –, 6 – VERY PRELIMINARY

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 (a) HF from 235 U target (b) LF from 235 U target (c) LF from 238 U target (d) HF from 238 U target E. Leal USC (ES) and IN2P3-Orsay (FR)

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Feasibility study for measuring (n, α) and (n,d) reactions at (very) high energies GeV Y. Uozumi Kyushu University (Japan) (p,p’), (p,n): 0.1 – 1.5 GeV (p,d): 0.3 and 0.4 GeV, GeV, 1.2 GeV (p, α) : 0.16 and 0.2 GeV, 1.2 GeV (p,p’) at low energy : MeV Nucl. Instr. Meth. B 291, (2012) Phys. Rev. C 86, , (2012) Only this Intranuclear Cascade model is capable of predicting light cluster production First test for studying these reactions (at high energy) when induced by neutrons Neutron beam Target Charged particle from 1.3 GeV n+A reaction  -flash

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 “Parasitic” n_TOF beam dump -R. Palomo et al.(U. Sevilla, Spain) Irradiation of 3D silicon detectors with high energy neutrons -S. Puddu, F. Murtas and M. Silari (CERN/RP) Test of a position sensitive GEM neutron detector -S. Puddu, F. Murtas and M. Silari (CERN/RP) Test of a movable GEM array as beam profiler -C. Tecla, F. Murtas and M. Silari (CERN/RP) Tests with Medipix detectors at n_TOF -R. Palomo and I. Villa (U. Sevilla and IFCA, Spain) FBG fibers response to high energy neutrons -M. Tardocchi (CNR-IFP, Milano, Italy) Diamond detector test under a neutron beam

C. Guerrero 44 th INTC Meeting at CERN, June 26 th 2013 Conclusions In 2012 the n_TOF facility has operated braking several n_TOF records: -Maximum number of experiments in a single campaign (10 dedicated + 6 parasitic) -Highest integrated beam intensity in a single campaign (~1.9x10 19 ) -Highest number of published papers in a year (1 PRL, 5 PRC, 3 EPJ-A, 2 NIM-A) FF Ang. Distribution 237 Np, 234,235,238 U Fission 240,242 Pu, 235 U Neutron capture 25 Mg, 88 Sr, 93 Zr, 235 U (n,chp) 10 B, 27 Al, 33 S, 59 Ni, Nuclear AstrophysicsNuclear technologiesMedical applications Basic Nucl. Phys.