Charge radii and electromagnetic moments of 195-211At

TY - JOUR

T1 - Charge radii and electromagnetic moments of 195-211At

AU - James G., Cubiss

AU - Barzakh, A.

AU - Seliverstov, Maxim

AU - Andreyev, Andrei N.

AU - Bujanic, Andelko

AU - Antalic, Stanislav

AU - Ascher, Philippe

AU - Atanasov, D.

AU - Beck, D.

AU - J., Bieron

AU - Blaum, K.

AU - Borgmann, Ch.

AU - Breitenfeldt, Martin

AU - Capponi, L.

AU - Cocolios, Thomas Elias

AU - Day Goodacre, T.

AU - Derkx, X.

AU - De Witte, Hilde

AU - Elseviers, Jytte

AU - Fedorov, D

AU - Fedosseev, Valentin N.

AU - Fritzsche, S.

AU - Gaffney, Liam Paul

AU - George, S.

AU - Ghys, Lars

AU - Hessberger, F. P.

AU - Huyse, Mark

AU - Imai, N.

AU - Kalaninova, Z.

AU - Kisler, D.

AU - Koester, Ulli

AU - Kowalska, M.

AU - Kreim, S.

AU - Lane, Joseph

AU - Liberati, Valentina

AU - Lunney, D.

AU - Lynch, Kara M

AU - Manea, V.

AU - Marsh, Bruce A

AU - Mitsuoka, S.

AU - Molkanov, P.L.

AU - Nagame, Y.

AU - Neidherr, D.

AU - Nishio, K.

AU - Ota, S.

AU - Pauwels, Dieter

AU - Popescu, Lucia-Ana

AU - Radulov, Deyan

AU - Rapisarda, Elisa

AU - Revill, J. P.

AU - Rosenbusch, M.

AU - Rossel, R.E.

AU - Rothe, S.

AU - Sandhu, K.

AU - Schweikhard, L.

AU - Sels, Simon

AU - Truesdale, V.L.

AU - Van Beveren, Celine

AU - Van den Bergh, Paul

AU - Wakabayashi, Y.

AU - Van Duppen, Piet

AU - Wendt, K.

AU - Wienholtz, F.

AU - Whitmore, B. W.

AU - Wilson, G. L.

AU - Wolf, R.N.

AU - Zuber, K.

A2 - Popescu, Lucia-Ana

N1 - Score=10

PY - 2018/5/29

Y1 - 2018/5/29

N2 - Hyperfine-structure parameters and isotope shifts of 195–211At have been measured for the first time at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy method. The hyperfine structures of isotopes were recorded using a triad of experimental techniques for monitoring the photo-ion current. The Multi-Reflection Time-of-Flight Mass Spectrometer, in connection with a high-resolution electron multiplier, was used as an ion-counting setup for isotopes that either were affected by strong isobaric contamination or possessed a long half-life; the ISOLDE Faraday cups were used for cases with high-intensity beams; and the Windmill decay station was used for short-lived, predominantly α-decaying nuclei. The electromagnetic moments and changes in the mean-squarecharge radii of the astatine nuclei have been extracted from the measured hyperfine-structure constants and isotope shifts. This was only made possible by dedicated state-of-the-art large-scale atomic computations of the electronic factors and the specific mass shift of atomic transitions in astatine that are needed for these extractions. By comparison with systematics, it was possible to assess the reliability of the results of these calculations and their ascribed uncertainties. A strong deviation in the ground-state mean-square charge radii of the lightest astatine isotopes, from the trend of the (spherical) lead isotopes, is interpreted as the result of an onset of deformation. This behavior bears a resemblance to the deviation observed in the isotonic polonium isotopes. Cases for shape coexistence have been identified in 197,199At, for which a significant difference in the charge radii for ground (9/2−) and isomeric (1/2+) states has been observed.

AB - Hyperfine-structure parameters and isotope shifts of 195–211At have been measured for the first time at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy method. The hyperfine structures of isotopes were recorded using a triad of experimental techniques for monitoring the photo-ion current. The Multi-Reflection Time-of-Flight Mass Spectrometer, in connection with a high-resolution electron multiplier, was used as an ion-counting setup for isotopes that either were affected by strong isobaric contamination or possessed a long half-life; the ISOLDE Faraday cups were used for cases with high-intensity beams; and the Windmill decay station was used for short-lived, predominantly α-decaying nuclei. The electromagnetic moments and changes in the mean-squarecharge radii of the astatine nuclei have been extracted from the measured hyperfine-structure constants and isotope shifts. This was only made possible by dedicated state-of-the-art large-scale atomic computations of the electronic factors and the specific mass shift of atomic transitions in astatine that are needed for these extractions. By comparison with systematics, it was possible to assess the reliability of the results of these calculations and their ascribed uncertainties. A strong deviation in the ground-state mean-square charge radii of the lightest astatine isotopes, from the trend of the (spherical) lead isotopes, is interpreted as the result of an onset of deformation. This behavior bears a resemblance to the deviation observed in the isotonic polonium isotopes. Cases for shape coexistence have been identified in 197,199At, for which a significant difference in the charge radii for ground (9/2−) and isomeric (1/2+) states has been observed.

KW - laser spectroscopy

KW - ISOLDE

KW - astatine

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/30009493

U2 - 10.1103/PhysRevC.97.054327

DO - 10.1103/PhysRevC.97.054327

M3 - Article

VL - 97

SP - 1

EP - 19

JO - Physical Review C

JF - Physical Review C

SN - 0556-2813

IS - 054327

M1 - 054327

ER -