In-Gas Laser Ionization and Spectroscopy of rare isotopes

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Presentation transcript:

In-Gas Laser Ionization and Spectroscopy of rare isotopes P. Creemers, R. Ferrer, L. Ghys, C. Granados, M. Huyse, Yu. Kudryavtsev, Y. Martínez, E. Mogilevskiy, S. Raeder, S. Sels, P. Van den Bergh, P. Van Duppen, A. Zadvornaya KU Leuven, Instituut voor Kern- en Stralingsfysica OUTLINE Motivation In-Gas-Cell Laser Spectroscopy @ LISOL In-Gas-Jet Laser Spectroscopy @ S3-LEB Summary & Outlook R. Ferrer · BriX Workshop: Spring 2014

Motivation N = Z nuclei -Study role of proton-neutron correlations- Proximity doubly magic N = Z = 50 -strong shell correction effects- Proton drip line -rp process, nuclei far off stability- SHE – understand SHE and those at the limit of nuclear existence – Nuclear properties: deformation, shape coexistence Atomic properties: transition energies and strengths, ionization potentials, observe QED and relativistic effects  test nuclear and atomic models and guide new theoretical development R. Ferrer · BriX Workshop: Spring 2014

Laser spectroscopy for nuclear physics Static moments of exotic nuclei are determined by the interaction of the nuclear charge distribution and nuclear magnetism with the electromagnetic fields created by the atomic electrons Measured: Isotope shifts Isomer shifts Hyperfine splitting Deduced observables: (model independent) Sizes Quadrupole Mom. Dipole Mom. Spins Inferred information: (model dependent) Single/few particle configurations Shapes/deform. parameters R. Ferrer · BriX Workshop: Spring 2014

Resonance Ionization Spectroscopy Leuven Isotope Separator On-Line (LISOL) facility: In-Gas Laser Ionization and Spectroscopy (IGLIS) of RIB’s Yu. Kudryavtev et al., NIM B 114 (1996) 350 M . Facina et al., NIM B 226 (2004) 401 excimer 1 excimer 2 dye reference cell He-Ne λ-meter gas cell CYCLONE 110 cyclotron beam SPIG target accel. optics dipole magnet tape station / windmill collector plates SHG SEM Ionization chamber Laser Hut ~ 15 m measuring station: Max. rep.: 200 Hz λ1 λ2 g.s continuum λ1 λ2 IP Aut. state In-gas-cell spectroscopy of neutron deficient Cu and Ag isotopes T. E. Cocolios et al., PRL 103 (2009) 102501 T. E. Cocolios et al., PRC 81 (2010) 014314 R. F. et al., PLB 728 (2014) 191 R. Ferrer · BriX Workshop: Spring 2014

In-Gas-Cell Laser Spectroscopy of Ag 92Mo(14N – 130 MeV,2pxn)104−xAg 64,natZn(36Ar – 125 MeV,pxn)101−xAg count rates: 101Ag=2.3 pps , 97Ag=0.9 pps etotal~2 % R. Ferrer · BriX Workshop: Spring 2014

Results Analysis of Ag Data R.F. et al., Phys. Lett. B 728 (2014) 191 - Mean charge radii show parabolic trend as in isotope chains of Cd, In, and Sn - LISOL results show a trend towards spherical nuclear shape as predicted by droplet model - Tentative spin assignment of 97,99Ag to 9/2 - Lack of spectral resolution does not allow spin assignment of 98,100Ag R. Eder et al., PRC 31 (1985) 190 V. V. Golovko et al., PRC 81 (2010) 054323 U. Dinger et al. NPA, 503 (1989) 331 W. Fischer et al. Z. Phys. A, 274 (1975) 79 R. Ferrer · BriX Workshop: Spring 2014

Attempt at Laser Spectroscopy on Sn Strong l-dependence on pressure Impossible HFS measurements (FWHM~15GHz) 92Mo(16O-100 MeV,2-3n)105,106Sn gbr =32(4) MHz/mbar 120Sn Yu. Kudryavtsev et al., RSI 85 (2014) 02B915 A. Nadeem et al., J.P.B 33 (2000) 3729 106Sn argon etotal~0.5 %, selectivity~400 R. Ferrer · BriX Workshop: Spring 2014

Broadband Spectroscopy of Ac 197Au(20Ne-145 MeV,4-5n)212,213Ac I.P. 43394.45 cm-1 2D3/2 4P5/2 418.312 nm 439.21 nm g.s. continuum 23898.86 cm-1 46660.6 cm-1 2D3/2 4P5/2 438.58 nm 434.7 nm g.s. continuum 22801 .1cm-1 46810.cm-1 I.P. 43394.45 cm-1 J. Rossnagel et al., PRA 85 (2012) 012525 R. Ferrer · BriX Workshop: Spring 2014

Laser Spectroscopy in the Free Gas Jet

Towards extraction RFQ Laser Spectroscopy in the Free Gas Jet L2 L1 Gas cell 900 -bent RFQ Towards extraction RFQ Yu. Kudryavtsev et al., NIM B 297 (2013) 7 Detector Atomic beam Laser beams + Crucible T=1250K Atomic Beam Unit p~ 5·10-6 mbar a b 1830 MHz 450 MHz 300 MHz Atomic beam 63Cu Gas Jet 65Cu R. Ferrer · BriX Workshop: Spring 2014

HELIOS @ KU Leuven measuring station dipole magnet beam optics front-end vacuum chamber - gas cell - RFQ ion guides pumping system beam diagnostics dipole magnet measuring station beam optics Investigate jet properties with CD nozzle Test new laser system Optimize gas cell design R. Ferrer · BriX Workshop: Spring 2014

REGLIS3 @ SPIRAL2 (GANIL) VHE (actinides) Atomic scheme for Ac recently tested Develop Atomic schemes for other actinides - in-jet spectroscopy to increase resolution 80Zr - Atomic scheme to be studied - In-gas cell/In-gas jet spectroscopy DE l1,2 l2 l1 gas inlet S3 beam toward MR-ToF & detectors or DESIR Gas Cell RFQ ion guides in-gas-cell ionization in-gas-jet 107-101Sn - Atomic scheme known In-jet mode required owing to p dependence 94Ag - Atomic scheme known - In-jet mode to increase resolution R.F. et al., NIM B 317 (2013) 570 R. Ferrer · BriX Workshop: Spring 2014

Candidates for IGLIS in the 100Sn region N=Z N = 50 N = 40 Z=50 R. Ferrer · BriX Workshop: Spring 2014

Candidates for IGLIS in the SHE region Z = 112 N = 126 N = 168 265Bh 254No 248Bk 231U 215Ac Atomic transitions need to be found prior to laser spectroscopy studies Interplay between theory and experiments is required to extract nuclear ground- and isomeric-state properties R. Ferrer · BriX Workshop: Spring 2014

Outlook Optimize IGLIS technique in the HELIOS laboratory at KU Leuven Relocate laser system at S3 to perform spectroscopy with the REGLIS3 setup: Perform high-sensitivity laser spectroscopy on RIB’s with an enhanced resolution ~ 300 MHz 97Ag Provide high-purity isomeric beams for other users of the S3-LEB R. Ferrer · BriX Workshop: Spring 2014

GANIL- IPN Orsay – LPC Caen: Acknowledgments Collaborators JYFL University of Jyväskylä: I. Moore, M. Reponen, V. Sonnenschein GANIL- IPN Orsay – LPC Caen: B. Bastin, D. Boilley, Ph. Dambre, P. Delahaye, P. Duchesne, X. Fléchard S. Franchoo, N. Lecesne, H. Lu, F. Lutton, Y. Merrer, B. Osmond, J. Piot , O. Pochon, H. Savajols , J. C. Thomas, E. Traykov RIKEN-Tokyo: T. Sonoda JINR-Dubna: S. Zemlyanoy University of Mainz: A. Hakimi, T. Kron, S. Richter, J. Rossnagel, K. Wendt GSI-Darmstadt: M. Block, M. Laatiaoui AND THANK YOU ALL FOR YOUR ATTENTION