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masses in the cosmos measurement programs comparisons mass models facing the challenge Nuclei in the Cosmos – IX 25-30 June 2006 CERN, Geneva David Lunney – CSNSM (IN2P3/CNRS) – Université de Paris Sud, Orsay
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High resolution mass spectrographs Development of first mass model C. F. v. Weizsäcker, H.A. Bethe (1935/36) F.W.Aston (~1920‘s): 212 isotopes discovered Packing fraction Some introductory remarks on history How the sun shines,” J. Bahcall http://nobelprize.org/physics/ E = mc 2 A. Eddington (~1920) Stellar combustion
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Motivation from “fundamental” physics metrology: the kilogram: 28 Si atomic mass standard and other fundamental constants (what if they vary with time?!)
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nuclear structure from the mass surface
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known masses r-process path decay path decay one / two -delayed neutron decay p-isotope s r Pb Tl Hg Hf Lu Yb Tm Er Au Pt Ir Os Re W Ta Po Bi At neutron number126 s stable isotopes -process path Stellar Nucleosynthesis (A 200)
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Techniques Indirect (energy) reactions: A(a,b)B Q = M A + M a - M b - M B decays: A B + Q = M M Direct (mass spectrometry) time of flight: TOF = (m/q) (L/B ) cyclotron frequency: f c = qB/m ISOL (keV) FIFS (MeV) PRODUCTION SCHEME better precision better sensitivity ‘the best of both worlds’ gas cell RFQ
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ESR-FRS (GSI) SPEG CSS2 (GANIL) ISOLTRAP (CERN) MISTRAL (CERN) FSU- TRAP (MIT) UW-PTMS
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mass measurement programs at GANIL CSS1 SPEG Resolving power: 10 4 extremely sensitive SPEG time-of-flight + magnetic rigidity m = q B T / L H. Savajols et al., EPJ A 25 (2005) 23 and B. Jurado et al., submitted (2006) - - - - - - - - - - + + + + + X Y Z
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mass measurement programs at GANIL CSS1 CSS2 time-of-flight: phase difference with acceleration (longer flight path) M. Chartier et al., J. Phy. G 31 (2005) S1771
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mass measurement programs at GANIL CIME (SPIRAL) time-of-flight: variable RF acceleration (longer flight path) M.-B. Gomes Hornillos et al., J. Phy. G 31 (2005) S1869
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mass measurement programs at GSI Isochronous Mode very fast but not as precise Schottky Mode very precise but cooling slow Experimental Storage Ring: m/q)/(m/q) v/v ( t 2 2 ) f/f t 2
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IMS 2002 M. Matos, Ph.D (2004) SMS 2002 E. Kaza, Ph.D (2004) Yu. Litvinov, Ph.D. (2003): ~ 600 species in the ring 466 masses measured (117 calibration masses) 139 masses from links 200 improved masses 75 new mass values IMS J. Stadlmann (Ph.D) and Phys. Lett. B (2004) see talk of F. Bosch Yu. Novikov et al., Nucl Phys A (2002) Yu. Litvinov et al., (2005)
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Linac2 50 MeV Booster 1.4 GeV PS
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ISOLDE CERN, Geneva proton beam 1 GeV HRS GPS REX-ISOLDE MISTRAL ISOL- TRAP 10 m
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COLETTE Paul trap MISTRAL Detector Quadrupole Doublet ISOLDE Beam Reference Source 1 m MISTRAL 2005 * D.E. Alburger et al. Phys. Rev. C 18, 2727 (1978) Alburger 78 * Mass Excess (keV) 12 Be (T 1/2 = 21 ms)
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1 m The mass spectrometer ISOLTRAP 2 cm hyperbolic Penning trap: precision mass measurement cylindrical Penning trap: isobar separa- tion & cooling 20 cm Gas-filled RF-Paul trap: universal beam collector low energy bunches continuous 60 keV ISOLDE beam see talk of A. Herlert
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SHIPTRAP (GSI) CPT (ANL) LEBIT (NSCL) TITAN (TRIUMF) ISOLTRAP (CERN) (RIKENRING) JYFLTRAP MATS (FAIR) or “what ISOLTRAP hath wrought” SMILETRAP (MSI) MAFFTRAP
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Canadian Penning Trap (CPT) facility at ANL 46 V 46 Ti : Savard et al., PRL (2005) (not available from ISOLDE) See poster here. beam
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trap cooler ion guide mass separator JYFLTRAP at the Jyväskylä IGISOL ISOLDE elements See poster of A. Jokinen IGISOL elements
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SHIPTRAP facility at GSI ISOL facility for transuranium nuclides 92 Mo ( 58 Ni,xpyn) 147 Ho new masses for 147 Ho, 147,148 Er ( 10 6 ) (M. Block et al., ENAM04) see poster here
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Low Energy Beam & Ion Trap (LEBIT) facility at NSCL/MSU http://www.nscl.gov/lebit G. Bollen et al., PRL 96 (2006)
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M. Matoš (CGS-12, Notre Dame) AIP Conf. Proc. 819 (2006) 164 See poster of A. Estrade 86 Kr primary beam
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cyclotron target separator post- accelerator magnet
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Reviews of Modern Physics, 75 (2003) 1021
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ENAM04 Proc., Eur. Phys. J. A, 25 (2005) 3
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Proc. Nuclei in the Cosmos IX, PoS (2006) ?
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Performance of the various methods See: Lunney, Pearson & Thibault, Rev. Mod. Phys. 75 (2003) 1021
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MAFF facility at FRM-II M ünich A ccelerator for F ission F ragments trap n-rich nuclides trap funnel Bavarium D. Habs et al., ENAM 2004 (MAFF workshop 04/2005)
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ISAC beam TRIUMF Ion Trap (TITAN) facility Paul trap Cooling and Bunching (1-5ms) EBIT Rapid charge breeding (2-30 ms) Wien filter m/q selection Penning trap Precision mass measurement (~ 10-100ms) J. Dilling et al. ENAM04 Mass measurements T 1/2 ≈10 ms m/m < 1 10 -8 Operational 2006 f c = qB/m
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Beyond the horizon GSI ’s future Facility for Antiproton and Ion Research (FAIR) FAIRTRAP (MATS) FAIR RINGS (ILIMA)
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stellar nucleosynthesis
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The atomic mass evaluation* * G. Audi and A.H. Wapstra, Nuclear Physics 1988, 1993, 1995, 2003 S P Si Al 10 11 12 13 14 15 16 16 15 14 13 27 Al (p, ) 28 Si 28 Si ( 3 He, 8 Li) 23 Al 28 Si ( 4 He, 8 He) 24 Si 28 Si (p,t) 26 Si 28 Si (p,n) 28 P 28 Si (d,p) 29 Si 28 Si (p, ) 29 P 28 Si ( +, - ) 28 S 31 P (p, ) 28 Si and 28 Si / 12 C Not a compilation !
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The Mass Evaluation. 28 Si. 1 =......... 28 Si... Audi-Wapstra mass table 5520 experimental data (186 rejected) plus 601 estimated data 3652 equations; 3017 parameters 1920 ground state masses plus 730 recommed values least squares mass adjustment (1993)
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A simplified overview of mass models microscopic sculpturings of a macroscopic blob (FRDM) algebraic formulas (Garvey-Kelson; IMME) microscopic nucleon-nucleon interaction (RMF / HFB) physics input ease of use Extended Thomas-Fermi Strutinki Integral model macro: TF Skyrme approximation micro: Strutinski correction (folded Skyrme) 9 parameters good mass fit most nuclear properties now full HFB HFBCS:S. Goriely et al., At. Nuc. Data (2001) HFB 1:M. Samyn et al., Nucl. Physics (2002) HFB 2:S. Goriely et al., Phys. Rev. C (2002) HFB 3:M. Samyn et al., Nucl. Physics (2003) HFB 4-7:S. Goriely et al., Phys. Rev. C (2003) HFB 8:M. Samyn et al., Phys. Rev. C (2004) HFB...
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Fit to 1995 AME (1768 masses) local models Only 60% masses fit 15+4 18+4 15+4 19+12 28 34+81 21+12 mass data parameters + other data parameters Chaos-limited mass prediction?
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D. Lunney et al., ENAM 1995 (Arles) mass model comparisons
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From: D. Lunney, “Nuclear masses: Experimental programs, theoretical models and astrophysical interest,” p. 296
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Conclusions Mass Models microscopic era; real need for data (diagnostic tool) Kierkegaard: I must find a truth that is true for me. Mass Measurements higher performance; programs multiplying more data, better quality Lichtenberg: To find something new, must build something new. Mass Evaluation global benchmark (last judgement) “A false balance is abomination to the Lord: but a just weight is his delight.” — Proverbs 11.1 “ The construction of the universe is certainly much easier to explain than that of a plant ”.
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