Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.212501
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Funding
- Science and Technology Facilities Council [ST/F012071/1, ST/J000159/1]
- EU Seventh Framework through ENSAR [506065]
- BriX Research Program [P7/12]
- FWO-Vlaanderen (Belgium)
- STFC [ST/F012071/1]
- Ed Schneiderman Fund at NYU
- STFC [ST/J000159/1, ST/J004189/1, ST/F012071/1, ST/G006415/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/C532988/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/G006415/1, ST/J000159/1, ST/J004189/1, ST/F012071/1] Funding Source: researchfish
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The magnetic moments and isotope shifts of the neutron-deficient francium isotopes Fr202-205 were measured at ISOLDE-CERN with use of collinear resonance ionization spectroscopy. A production-to-detection efficiency of 1% was measured for Fr-202. The background from nonresonant and collisional ionization was maintained below one ion in 10(5) beam particles. Through a comparison of the measured charge radii with predictions from the spherical droplet model, it is concluded that the ground-state wave function remains spherical down to Fr-205, with a departure observed in Fr-203 (N = 116).
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