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The LaSpec project. At FAIR… Cheapest(?),Fully destripped…

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Presentation on theme: "The LaSpec project. At FAIR… Cheapest(?),Fully destripped…"— Presentation transcript:

1 The LaSpec project

2 At FAIR…

3 Cheapest(?),Fully destripped…

4 Still cooled:

5 TDR available…

6 Final layout…

7 MATS LaSpec RFQ mass separation Ions Atoms gas catcher / inverse cyclotron Ions from Super-FRS 13 m 10 m 210 m² LaSpec laser lab 55 m² annex building 6b --second floor-- MATS lab W. Nörtershäuser et al., Hyperfine Interactions 171 (2006) Previous “final” layout… *

8 *

9 *

10 Ground State Properties Isotope Shift (IS)Hyperfine Structure (HFS) Nuclear Spin I Magnetic Dipole Moment  I Electric Quadrupole Moment Q s Hyperfine Anomaly Mean Square Charge Radii

11

12 K Cu Na

13 Wavelength ~ 589 – 590 nm

14 Na Fine structure at part per thousand level Now excite the transition with a laser...

15 Super zoom....line ~10 15 Hz

16 Ground State Properties MODEL INDEPENDENT ISOLATED STATE J, magnetic moment, Q s,

17 At FAIR…

18 To the very neutron rich…..to find?..with what signature? (..using an EM probe to explore neutral particles?)

19 Aufmuth et al. ADNDT 37 (1987) 3

20 N       Samarium Interpreting?

21 S 2n (N,Z) = B(N,Z) – B(N – 2,Z) Discontinuity of S 2n observed for Sr-Rb isotopes at N=60

22 S 2n (N,Z) = B(N,Z) – B(N – 2,Z) Discontinuity of S 2n observed for Sr-Rb isotopes at N=60

23 Rb Sr Y Zr Nb Mo Kr The NEW mass and charge radii data...

24 NOW we’re consistent... (also, never wrong...) (like a geophysical survey...)

25 Laser Spectroscopy at the LEB next door to MATS...

26 RFQ Spectroscopy 7 T superconducting solenoid @ 30 kV: Purification trap (  M/M < 10 -5 ): Precision trap (  M/M < 10 -6 ): V. Kolhinen et al., NIM A 528 (2004) 776 S. Rinta-Antila et al., PRC 70 (2004) 011301(R) A. Jokinen et al., IJMS 251 (2006) 241 K130-accelerator + IGISOL: Mass-separated 1+ DC ion beam at 30 keV of all elements.

27 Both need stopped beam… Beam cooler ~100eV Fragment stopper GeV

28 ß-NMR LD-RIS +ν tag Coincidence and decay tagged atom/ion spec. LD-RIS Bunched beam spectroscopy At FAIR…

29

30 The IGISOL facility, JYFL Frequency (MHz) 102 101 100 99 98 96 94 93 92 95 97 50 – 5000 ions per sec

31 To the very neutron rich…..to find?..with what signature?..using an EM probe to explore neutral particles?

32 To date; All shell closures, Sub-shell closures, N=88, Zr region, Octupole regions, Shape coexistence, Haloes??

33 NB: Qs 9 Li ~ Qs 11 Li !! Sanchez et al. PRL 96 03002 (2006) 8 Li 20945.8 9 Li 24954.9 11 Li 40728.3 

34 Protons and neutrons… Just the protons…

35 For the future... Guenaut et al. J.Phys.G 31 (2005) S1765

36 Baldrick... Guenaut et al. J.Phys.G 31 (2005) S1765

37 Final layout…

38 1960

39 1980

40 1990

41 2000

42 2009

43 2015?

44 The IGISOL facility, JYFL Frequency (MHz) 102 101 100 99 98 96 94 93 92 95 97 50 – 5000 ions per sec

45 Pumping in the cooler:

46 Niobium (improved, cw) +0.03

47 Summary: Plenty of atomic concerns but all for nuclear spectroscopy.......and all ready to go

48 F Charlwood K Baczynska T Eronen University of Manchester University of Birmingham University of Jyvaskyla Data from… Thanks…

49 I=0I≠0I≠0Prolate Frequency (MHz) 102 101 100 99 98 96 94 93 92 Decreasingly strong prolate Yttrium J=0 – J’=1 (363nm) Increasingly oblate 95 97

50 Hyperfine anomaly (Ta) Differential anomaly of ~ 1% detected in both lower states; Distribution of nuclear magnetisation has changed (by a huge amount, nb Moskowitz-Lombardi)

51    2 2 Hyperfine anomaly: Ta Hafnium charge radii 180 Ta 181 Ta Measure the 180 Ta ground state anomaly … matter radii

52 Hyperfine anomaly: Lu Georg et al. Eur Phys J A3 (1998) 225 Au/Al mass


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