1. Kieran Flanagan University of Manchester University of Manchester, U.K.: K.T. Flanagan, J. Billowes, B. Cheal, K.M. Lynch, T.J. Procter K.U. Leuven, Belgium: M.L. Bissel, I. Budincevic, R. Garcia-Ruiz, G. Neyens, J. Papuga, M.M. Rajabali ISOLDE, CERN, Geneva, Switzerland: T.E. Cocolios, H.A. Khozani, K.M. Lynch, B. Marsh, S. Rothe MPI fur Quantenoptik, Garching, Germany: M. Hori, H.A. Khozani, A. Soter University of Tokyo, Tokyo, Japan: A. Dax, T. Kobayashi IPN-Orsay, France: F. Le Blanc, I. Matea D. Verney New York University, New York, USA: H.H. Stroke Mainz University, Germany: K. Wendt University of Surrey, UK: P.J. Mason, P.M. Walker University of the West of Scotland, UK: A. N. Andreyev

2.  2008: Proposal submitted to INTC, design completed and construction of beam line started.  2009: Major parts of the beam line installed, initial vacuum tests (differential pumping) and high voltage tests completed.  2010: First ion beam tuning through the line, charge exchange efficiency tests (>50% efficiency for Rb). New digital data acquisition system for laser spectroscopy installed and tested. First radioactive beams.  2011: Off-line ion source installed and tested. New decay spectroscopy station installed. New laser system installed and first successful on-line experiment.

3. (πs 1/2 -1 )1/2+ proton intruder state becomes the ground state in 195At and 185Bi. Systematic reduction in energy of the deformed (πs 1/2 -1 )1/2+ in isotopes in this region of the chart. Suggestion that 199 Fr has I=1/2 + ground state spin with an associated large oblate deformation. 1/2 + 7/2 - 9/2 - 1/2 + 7/2 - 9/2 - 201 Fr 203 Fr The isomer shifts of 201,203 Fr and their magnetic moments will provide important information to better understand the evolution of nuclear structure in this region. New 1/2+ isomer discovered in 205 Fr (T 1/2 ~1ms). J. Uusitalo et al. Phys. Rev. C, 71 024306 (2005) U. Jakobsson et al. Phys. Rev. C 85, 014309 (2012 )

4. Border of the region of reflection asymmetry : 218,219 Fr  Region characterised by reversal in odd-even staggering, which is attributed to presence of octupole-quadrupole deformation.  Also characterised in the interleaving alternating band structure connected by enhance E1 transitions

5. Collinear Resonant Ionization Spectroscopy (CRIS) ▶Combining high resolution nature of collinear beams method with high sensitivity of in-source spectroscopy. ▶Allowing extraction of B factors and quadrupole moments. Relative Frequency (GHz) 68 Cu 10 0 20 4GHz 30MHz Yu. A. Kudriavtsev and V. S. Letokhov, Appl. Phys. B29 219 (1982)

6.  Collinear geometry gives a reduction in the thermal Doppler broadening by a factor of 10 3, improving resolution. Radioactive bunched ion beam from ISOLDE Stable beam from off line ion source Charge exchange cell Doppler tuning voltage applied PMT: fluorescence detection UHV interaction region MCP: ion detection Decay spectroscopy station: decay measurements Si detectors Ge detectors Laser beam ΔE = δ(½ mv 2 ) = mvδv ≈ constant

7. Relative frequency (MHz) 2000 4000 Ion Counts 50 30 1:30 From Jyvaskyla off-line tests Factor of 1000 improvement on photon detection High background rate 5cts/bunch <200MHz linewidth

8.  Literature: A(S 1/2 )=8484(1)MHz I=9/2  Preliminary result from this work: A(S 1/2 )=8390(100)[200]MHz  Low background rate~0.05/s  Wide tuning range (volts)  CEC efficiency ~50%  Total Efficiency~1:10 6  Power broadening  2 photon ionization bg  Non resonant collisional rate suppressed by a factor of 10 4 (MHz)

9.  Majority of the background is due to 422+422 non-resonant ionization.  With both lasers blocked the observed background is associated with collisional ionization. Suppressed by a factor of 10 4.  Pressure ~1-2x10 -8 mbar (an order of magnitude better has been demonstrated). Laser on Laser off

10.  Neutralization Efficiency : factor of 2-3.  High threshold due to noise in MCP: factor of 10.  Transmission loss: factor of 10.  Low fluence of the 1064 nm (second step). ◦ November 2011:1mJ in ~1cm 2 ~5.3x10 15 photons.cm -2 ◦ Measured cross sections for non resonant ionization 17(4) to 0.1 Mb, suggesting a factor between 100 and 1000 was lost. Total 10 4 -10 5 loss  MCP loss has been addressed.  30Hz Nd:YAG has up to 500 mJ/pulse available.  Assume same transmission and neutralization for 2012. 10 3 -10 4 can be regained

11.  Rotating wheel implantation system  10 carbon foils  Two Si detectors for alpha-decay detection either side of carbon foil  Ge detectors for gamma-ray detection  Steel wheel rotates and a new ion bunch is implanted into the fresh carbon foil

12. 207 Fr 6768 keV 203 At 6087.4 keV βetas  Voltage tuned onto resonance.  15 mins data collection time.  1ppA of 207Fr in the beam line.  Data shown in Red is due to collisional reionization in the interaction region.

13. The alphas emitted from 204 Fr 204m1 Fr 204m2 Fr 204g Fr The gammas detected 204m2 Fr 230.9 keV  Using the characteristic hfs of each isotope, a pure ground state or isomeric beam can be studied.  Tuning the lasers on resonance, the blue spectrum would be obtained for 204g Fr and the red spectrum for 204m2 Fr.

14.  Beam line fully commissioned.  ~50% neutralization efficiency of Fr demonstrated. Beam mistuning minimized.  First hyperfine spectra of Fr measured.  Digital data acquisition demonstrated.  New laser system constructed and demonstrated.  Decay spectroscopy station installed.  Laser assisted decay spectroscopy demonstrated (Kara Lynch PhD).  Background suppression of Fr (with lasers off) is ~ factor of 10000.  Currently low experimental efficiency, can account for the majority of the effect.  2 papers in preparation and 2 conference proceedings submitted.

15. IsotopesYield (ions/µC) Number of shifts Notes 220, 221,205-207 >10 7 6Reference and optimization measurements 2198.9x10 3 3-4Proton triggered 2184.3x10 3 3-4Proton triggered 2041.9x10 6 3Hyperfine studies and decay spectroscopy 2032x10 5 1 202703-4 Total of 21shifts requested over a one year period.

17. M. Hori, A. Dax Optics Letters 34, 1273 (2009).

18.  The 422-nm laser light of energy 1 mJ, pulse length 20 ns, and repetition rate 10 Hz was generated by a nanosecond Ti:Sapphire laser which was pumped by the second harmonic of a Q-switched Nd:YAG laser of energy 20 mJ.  Emphasis on simplicity and ease of use and black-box operation by digital control.  Linewidth is 100 MHz and frequency stability (caused by frequency chirp) is 50-60 MHz.  New Nd:YAG pump laser currently being prepared for 2012 campaign M. Hori, A. Dax Optics Letters 34, 1273 (2009).

19.  Associated with a misalignment of the beam through the charge exchange cell.  As a high voltage is applied to the cell the beam is deflected.  The effect should be further minimized by operating at higher beam energies Negative voltage Positive voltage

20.  Example of an ion bunch recorded by the digital data acquisition.  Full time stamping of every event for off-line analysis.

21. MCP/PMT Laser system Trigger generator LeCroy digital scope NI PXI chassis Voltage scanning PC Data Acquisition PC ISCOOL

22.  When the laser frequency is on resonance with a H F transition, the isotope is resonantly ionized  Resonant ionization selects the isotope of interest  Analogous to the mass resolution in mass spectrometry Isotope AIsotope B Isotope A GS E1E1 E2E2 IP S1S1 S2S2 Isotope B The higher the number of excitation steps, the greater the selectivity S = S 1 × S 2 S = ∏ S n Selectivity of an isotope is: