Collinear laser spectroscopy with the COLLAPS setup M. L. Bissell on behalf of the COLLAPS collaboraion IS508: Mn IS519: Zn IS529: Ca.

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Presentation transcript:

Collinear laser spectroscopy with the COLLAPS setup M. L. Bissell on behalf of the COLLAPS collaboraion IS508: Mn IS519: Zn IS529: Ca

BUNCHED BEAM COLLINEAR LASER SPECTROSCOPY 2 T ac ≈ 100 ms T b ≈3μs accumulation release

IS519: Shell structure and level migrations in zinc studied using collinear laser spectroscopy 3 Shifts: 21 awarded in 2011, 21 remaining. Physics Case: Zn: Spins, moments and charge radii. π2p 3/2 and π1f 5/2 level inversions in Cu (N=44→46) and Ga(N=46 → 50) Phys. Rev. Lett (2009), Phys. Rev. Lett (2010): But what is happening with the neutrons? Feasibility: UC x with RILIS + quartz line + n-converter. Yield predictions remain unchanged. Shift estimates not strongly correlated with yield.

IS508: Collinear laser spectroscopy of manganese isotopes using optical pumping in ISCOOL 4 Shifts: 18 awarded, 7 remaining. Performed Studies:Initial offline testing of optical pumping in ISCOOL (December 2011) unsuccessful.  Realignment of ISCOOL scheduled for LS1 so started on-line studies with less efficient atomic transition. November 2012 took 11 shifts to measure Mn.

IS508: Collinear laser spectroscopy of manganese isotopes using optical pumping in ISCOOL 5 HFS components linked to t 1/2 of state by accepting counts for different time periods after proton impact. J=5/2 - 3/2 atomic transition with high spins and isomers = Difficult But all spins, magnetic moments and charger radii obtained. Transition rather insensitive to Q. -A few cases (58,60,62 I=1 states) would benefit from further study in the ionic system.

IS508: Collinear laser spectroscopy of manganese isotopes using optical pumping in ISCOOL 6 Future Plans with remaining shifts: 1)Repeat offline testing after reinstallation of ISCOOL. 2)Use optical pumping in the cooler with the nm ionic transition. -Cross N=40 ( 65,66 Mn) -Improve Q’s of difficult cases.

Shifts: 18 awarded in 2011, 0 remaining. Physics Case: Ca: Spins, moments and charge radii. Shifts awarded for measurements up to 52 Ca used successfully. IS529: Spins, Moments and Charge Radii Beyond 48 Ca 7 52 Ca measured with ≈300 ions/s in 4 hours. New sensitivity record for BBCLS at COLLAPS

Addendum to IS529: Spins, Moments and Charge Radii Beyond 48 Ca M. L. Bissell on behalf of the COLLAPS collaboraion

The ROC Technique 9 Radioactive detection of Optically pumped ions after state selective Charge exchange (ROC)

53 Ca Multi-step optical pumping 10 Smaller components enhanced from ≈1/20 th. of I=0 intensity to ≈1/5 th. Shifts required for 53 Ca similar to 54 Ca.

Ion optical design 11 Full SIMION validation completed 1)Simultaneous focusing at atom and ion detectors. 2)Acceptance ≈ 30π mm mrad. 3)Consistent with standard COLLAPS beam input parameters.

Detector design 12

Shift requirements 13 Shift requirements highly sensitive to both 54 Ca yield and contamination. Estimated based on 2 scenarios- 1) 54 Ca yield 1/20 th of that observed by ISOLTRAP and contamination equal. 2) 54 Ca yield equal to ISOLTRAP and contamination close to saturating the detectors. - Based on 5 scans of 5σ Shifts 54 Ca5 53 Ca9 Calibration scans2 Scintillator setup/ optimisation1 17

The Collaborations 14 IS529 M. L. Bissell, 1 K. Blaum, 2 I. Budincevic, 1 C. Gorges, 3 R. P. de Groote, 1 R. F. Garcia Ruiz, 1 Ch. Geppert, 3 M. Hammen, 4 H.Heylen, 1 S. Kaufmann, 3 M. Kowalska, 5 P. Lievens, 6 K. M. Lynch, 1 R. Neugart, 2 G. Neyens, 1 W. Nörtershäuser, 3 J. Papuga, 1 R. Sanchez 7 and D. T. Yordanov 8 With: IS519 B. Cheal, 9 C.Babcock, 9 J. Billowes, 10 P. Campbell, 10 T.E. Cocolios 10, D.H. Forest, 11 I.D. Moore 12 and H. H. Stroke 13 With: IS508 B.Cheal, 9 C.Babcock, 9 J. Billowes, 10 P. Campbell, 10 V.N. Fedoseyev, 5 D.H. Forest, 11 B. Marsh, 5 I.D. Moore, 12 M. Reponen 12 and S. Rothe 5 1 Instituut voor Kern- en Stralingsfysika, KU Leuven, B-3001 Leuven, Belgium 2 Max-Planck-Institut für Kernphysik, D Heidelberg, Germany 3 Institut für Kernphysik, TU Darmstadt, D Darmstadt, Germany 4 Institut für Kernchemie, Universität Mainz, D Mainz, Germany 5 CERN, CH-1211 Geneva 23, Switzerland 6 Afd. Vaste-Stoffysica en Magnetisme, KU Leuven, B-3001 Leuven, Belgium 7 GSI Helmholtzzentrum für Schwerionenforschung, D Darmstadt, Germany 8 CSNSM-IN2P3-CNRS, Université de Paris Sud, F Orsay, France 9 Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK 10 Schuster Building, University of Manchester, Brunswick Street, Manchester, M13 9PL, UK 11 School of Physics and Astronomy, The University of Birmingham, Birmingham, B15 2TT, UK 12 Department of Physics, University of Jyväskylä, PB 35 (YFL) FIN of Jyväskylä, Finland 13 Department of Physics, New York University, 4 Washington Place, New York, NY 10003, USA