Laser assisted decay spectroscopy at the CRIS beam line at ISOLDE

Lynch, K. M.; Rajabali, Mustafa; Aghaei-Khozani, H.; Billowes, J.; Bissell, M. L.; Blanc, F. Le; Cheal, B.; Cocolios, T. E.; Schepper, Sofie De; Dewolf, K.; Flanagan, Kieran; Hori, Masaki; Kobayashi, T.; Marsh, B. A.; Neyens, G.; Papuga, J.; Procter, T.J.; Rothe, S.; Simpson, G. S.; Smith, A. J.; Stroke, H. H.; Wendt, Κ.

doi:10.1088/1742-6596/381/1/012128

Cited by 14 publications

(6 citation statements)

References 20 publications

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“…The decay-spectroscopy station provides the ability to identify overlapping hyperfine structures and eventually perform laser-assisted nucleardecay-spectroscopy measurements on pure ground-and isomeric-state beams [32,73].…”

Section: Discussionmentioning

confidence: 99%

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

et al. 2014

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This paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes [202][203][204][205][206] Fr performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay-spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes [202][203][204][205][206] Fr, in addition to the identification of the low-lying states of 202;204 Fr performed at the CRIS experiment.

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Section: Discussionmentioning

confidence: 99%

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

et al. 2014

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“…A LeCroy WavePro 725 Zi 2.5 GHz bandwidth oscilloscope was used to detect the ion signal with a time window around the ion arrival time of 10 µs. During the experiment α-decay energy spectra were collected in separate measurements by implanting the ions in a carbon foil mounted in the decay spectroscopy station (DSS), around which a dedicated α-decay spectroscopy setup [30,37,38] detects emitted α-particles.…”

Section: Methodsmentioning

confidence: 99%

Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

et al. 2014

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Accepted for publication with Physical Review CThe magnetic dipole moments and changes in mean-square charge radii of the neutron-rich $^{218m,219,229,231}\text{Fr}$ isotopes were measured with the newly-installed Collinear Resonance Ionization Spectroscopy (CRIS) beam line at ISOLDE, CERN, probing the $7s~^{2}S_{1/2}$ to $8p~^{2}P_{3/2}$ atomic transition. The $\delta\langle r^{2}\rangle^{A,221}$ values for $^{218m,219}\text{Fr}$ and $^{229,231}\text{Fr}$ follow the observed increasing slope of the charge radii beyond $N~=~126$. The charge radii odd-even staggering in this neutron-rich region is discussed, showing that $^{220}\text{Fr}$ has a weakly inverted odd-even staggering while $^{228}\text{Fr}$ has normal staggering. This suggests that both isotopes reside at the borders of a region of inverted staggering, which has been associated with reflection-asymmetric shapes. The $g(^{219}\text{Fr}) = +0.69(1)$ value supports a $\pi 1h_{9/2}$ shell model configuration for the ground state. The $g(^{229,231}\text{Fr})$ values support the tentative $I^{\pi}(^{229,231}\text{Fr}) = (1/2^{+})$ spin, and point to a $\pi s_{1/2}^{-1}$ intruder ground state configuration

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“…This demonstrates the suitability of the CRIS technique for isobar cleaning and isomer selection. A parallel research programme has investigated the ability to purify radioactive beams and select just the isomeric states [40,41]. The hyperfine structure of the isomers in 204 Fr have been measured and the selected nuclear states directed to the decay spectroscopy station and studied.…”

Section: Discussionmentioning

confidence: 99%

First results from the CRIS experiment

et al. 2013

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The ability to study rare isotopes with techniques such as mass spectrometry and laser spectroscopy is often prevented by low production rates and large isobaric contamination. This has necessitated the development of novel beam cleaning techniques that can efficiently isolate the isotope of interest. The Collinear Resonance Ionization Spectroscopy (CRIS) experiment at ISOLDE, achieves this by resonantly ionizing a bunched atom beam in a region of ultra high vacuum. This method is motivated by the need to measure the hyperfine structure and isotope shift at the extremes of isospin where typical production rates drop to 1 atom/s. The technique also offers the ability to purify an ion beam and even select long-lived isomeric states (>1 ms) from the ground state, which can be subsequently studied by decay spectroscopy or mass spectrometry experiments. This paper will report on the successful commissioning of the CRIS beam line and the recent laser spectroscopy results and laser assisted nuclear decay spectroscopy on the neutron deficient francium isotopes.

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Laser assisted decay spectroscopy at the CRIS beam line at ISOLDE

Cited by 14 publications

References 20 publications

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

First results from the CRIS experiment

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