Campbell laspec by 233dKuz

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									The LaSpec
  project
                                 At FAIR…
    90

    80

    70

    60

    50                                                      Log Production Yield
                                                                    0
Z                                                                   1,000
                                                                    2,000
    40                                                              3,000
                                                                    4,000
                                                                    5,000
    30                                                              6,000
                                                                    7,000
                                                                    8,000
    20                                                              9,000
                                                                    10,00
                                                                    11,00
    10                                                              12,00
                                                                     Laser Spectroscopy


         0   10   20   30   40   50   60   70   80   90   100 110 120 130 140
                                            N
Cheapest(?),Fully
  destripped…
Still cooled:
TDR available…
Final layout…
            Previous “final” layout…
                                                      10 m



                                                                                 LaSpec
                                                                                              13 m



                       55 m²
                                                                                 RFQ
                                                                                     mass
                                           MATS                 210 m²
                                                                                 separation

                                                                 gas catcher /
                                                                                               *
annex building 6b                                             inverse cyclotron
 --second floor--
                                                                      Ions from Super-FRS

                    W. Nörtershäuser et al., Hyperfine Interactions 171 (2006)
*
*
        Ground State Properties

  Isotope Shift (IS)        Hyperfine Structure (HFS)




Mean Square Charge Radii            Nuclear Spin I
                            Magnetic Dipole Moment mI
            2 AA
       r                  Electric Quadrupole Moment Qs
                                  Hyperfine Anomaly
    Cu
K        Na
    Na




  Wavelength
~ 589 – 590 nm
                 Na


                                        Fine
                                     structure

                                    at part per
                                     thousand
                                       level




Now excite the transition with a laser...
Super zoom....line ~1015 Hz
Ground State Properties
    MODEL INDEPENDENT

     ISOLATED STATE




                 J, magnetic moment,
                      Qs,<r2>
                                 At FAIR…
    90

    80

    70

    60

    50                                                      Log Production Yield
                                                                    0
Z                                                                   1,000
                                                                    2,000
    40                                                              3,000
                                                                    4,000
                                                                    5,000
    30                                                              6,000
                                                                    7,000
                                                                    8,000
    20                                                              9,000
                                                                    10,00
                                                                    11,00
    10                                                              12,00
                                                                     Laser Spectroscopy


         0   10   20   30   40   50   60   70   80   90   100 110 120 130 140
                                            N
To the very neutron rich…

          ..to find?

    ..with what signature?

(..using an EM probe to explore
        neutral particles?)
Aufmuth et al. ADNDT 37 (1987) 3
Interpreting?


                b2=0.2


                         b2=0.0




     N          Samarium
        S2n(N,Z) = B(N,Z) – B(N – 2,Z)




Discontinuity of S2n observed for Sr-Rb isotopes at N=60
        S2n(N,Z) = B(N,Z) – B(N – 2,Z)




Discontinuity of S2n observed for Sr-Rb isotopes at N=60
                               Mo
                          Nb
                         Zr
                         Y
                         Sr
                    Rb


The NEW mass       Kr
and charge radii
    data...
NOW we’re consistent...




           (like a geophysical survey...)


            (also, <r2> never wrong...)
Laser Spectroscopy at the LEB




next door to MATS...
V. Kolhinen et al., NIM A 528 (2004) 776                                  K130-accelerator + IGISOL:
S. Rinta-Antila et al., PRC 70 (2004) 011301(R)
A. Jokinen et al., IJMS 251 (2006) 241
                                                                           Mass-separated 1+ DC ion beam
                                                                            at 30 keV of all elements.



                                                                                                 1400                                                       101
                                                                                                                                          101                  Mo
                  RFQ                                                                            1200
                                                                                                                              101
                                                                                                                                               Nb
                                                                                                 1000
                                                                                                                                  Zr
                                                                                                        FWHM = 20 Hz
                                                                                                 800    M/DM = 145 000




                                                                                Counts
                                                                                                 600

 Spectroscopy                                                                                    400
                                                                                                           101
                                                                                                 200             Y
                                                                                                   0

                                                                                                           1064700 1064750 1064800 1064850 1064900
                                                          1 q
                                                    fc =    B
                                                                                                                              Frequency [Hz]

                                                         2 m
                                                                                                  380

                                                  f c,ref   m - me                                360
                                                          =
                                                    fc      m ref - m e




                                                                           Time-of-flight [ms]
                                                                                                  340
                                                                                                                                               f: 833555.688(5) Hz
                                                                                                                                                       -6
                                                                                                  320                                          p: 4 x 10 mbar
        7 T superconducting solenoid @ 30 kV:                                                              129                                 Axial E: 0.4467(25) eV

        Purification trap (DM/M < 10-5):
                                                                                                  300                Xe                        (): 1.026(29) mm
                                                                                                                                               (): 0.025(13) mm
                                                                                                  280                                          Phase: 3.15(11) rad
        Precision trap (DM/M < 10-6):                                                                                                          Time: 387(4) ms
                                                                                                  260                                          Amplitude: 18.1(8) mV


                                                                                                        833545       833550      833555        833560        833565
                                                                                                                       Excitation frequency [Hz]
                   Both need stopped
                         beam…



Fragment stopper
      GeV




                   Beam cooler ~100eV
                             At FAIR…
    90
                   Coincidence and decay
    80
                   tagged atom/ion spec.
    70
                                                                              LD-RIS
    60       Bunched beam
              spectroscopy
    50                                                       Log Production Yield
                                                                     0
Z                                                                    1,000
                                                                     2,000
    40                                                               3,000
                                                                     4,000
                                                                     5,000
    30
                                                  LD-RIS             6,000
                                                                     7,000
                                                  +ν tag             8,000
    20                                                               9,000
                                                                     10,00
                                                                     11,00
    10                                                               12,00
                              ß-NMR                                   Laser Spectroscopy


         0    10   20   30   40   50   60   70   80   90   100 110 120 130 140
                                             N
                  50 – 5000                            102
                 ions per sec
                                                       101

                                                       100

                                                       99

                                                       98

                                97

                                96

                                95

                                94

                                93

                                92
 The IGISOL
facility, JYFL                       Frequency (MHz)
To the very neutron rich…

          ..to find?

    ..with what signature?

..using an EM probe to explore
       neutral particles?
To date;

All shell closures,
Sub-shell closures,
N=88,
Zr region,
Octupole regions,
Shape coexistence,

Haloes??
D   8Li  20945.8
     9Li 24954.9
                         NB: Qs 9Li ~ Qs   11Li   !!

    11Li 40728.3   Sanchez et al. PRL 96 03002 (2006)
           Protons and
            neutrons…




Just the
protons…
For the future...




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




       Guenaut et al. J.Phys.G 31 (2005) S1765
Final layout…
1960
1980
1990
2000
2009
2015?
                  50 – 5000                            102
                 ions per sec
                                                       101

                                                       100

                                                       99

                                                       98

                                97

                                96

                                95

                                94

                                93

                                92
 The IGISOL
facility, JYFL                       Frequency (MHz)
Pumping in the cooler:
Niobium (improved, cw)



            +0.03
Summary:

   Plenty of atomic concerns but all for
   nuclear spectroscopy...

   ....and all ready to go
    Data from…


University of Manchester
       F Charlwood

University of Birmingham
       K Baczynska

 University of Jyvaskyla
         T Eronen




       Thanks…
                             Decreasingly strong prolate
                                                                   102
Yttrium J=0 – J’=1 (363nm)
                                                                   101

                                                                   100

                                                                    99

                                                                    98

                                     97

                                     96

                                     95

                                     94

                                     93

                                     92
 I=0      I≠0   Prolate
                                                Frequency (MHz)

                                                        Increasingly oblate
            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)
           Hyperfine anomaly: Ta

Hafnium charge radii


b2 = 0.3



                           180Ta      181Ta




            b 2 = 0.2       Measure the
                            180Ta ground

                           state anomaly


                           … matter radii
        Hyperfine anomaly: Lu




Au/Al




                 mass


                Georg et al. Eur Phys J A3 (1998) 225

								
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