001662459 001__ 1662459
001662459 003__ SzGeCERN
001662459 005__ 20220810225331.0
001662459 0247_ $$2DOI$$a10.1103/PhysRevX.4.011055
001662459 0248_ $$aoai:cds.cern.ch:1662459$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN
001662459 035__ $$9arXiv$$aoai:arXiv.org:1402.4266
001662459 035__ $$9Inspire$$a1281717
001662459 037__ $$9arXiv$$aarXiv:1402.4266$$cnucl-ex
001662459 041__ $$aeng
001662459 100__ $$aLynch, K.M.$$uManchester U.$$uCERN$$uLeuven U.
001662459 245__ $$aDecay-Assisted Laser Spectroscopy of Neutron-Deficient Francium
001662459 246__ $$aDecay-assisted collinear resonance ionization spectroscopy: Application to neutron-deficient francium
001662459 260__ $$c2014-03-28
001662459 269__ $$c18 Feb 2014
001662459 300__ $$a15 p
001662459 500__ $$aComments: Accepted for publication with Physical Review X
001662459 500__ $$9arXiv$$aAccepted for publication with Physical Review X
001662459 520__ $$aThis paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes $^{202-206}$Fr performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly-sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes $^{202-206}$Fr, in addition to the identification of the low-lying states of $^{202,204}$Fr performed at the CRIS experiment.
001662459 520__ $$9APS$$a<p>This paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes <inline-formula><mml:math display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Fr</mml:mi></mml:mrow><mml:mprescripts></mml:mprescripts><mml:none></mml:none><mml:mrow><mml:mn>202</mml:mn><mml:mi>–</mml:mi><mml:mn>206</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math></inline-formula> performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay-spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes <inline-formula><mml:math display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Fr</mml:mi></mml:mrow><mml:mprescripts></mml:mprescripts><mml:none></mml:none><mml:mrow><mml:mn>202</mml:mn><mml:mi>–</mml:mi><mml:mn>206</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math></inline-formula>, in addition to the identification of the low-lying states of <inline-formula><mml:math display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Fr</mml:mi></mml:mrow><mml:mprescripts></mml:mprescripts><mml:none></mml:none><mml:mrow><mml:mn>202</mml:mn><mml:mo>,</mml:mo><mml:mn>204</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math></inline-formula> performed at the CRIS experiment.</p>
001662459 520__ $$9arXiv$$aThis paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes $^{202-206}$Fr performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly-sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes $^{202-206}$Fr, in addition to the identification of the low-lying states of $^{202,204}$Fr performed at the CRIS experiment.
001662459 540__ $$3publication$$aCC-BY-3.0
001662459 542__ $$3publication$$dThe Author(s)$$g2014
001662459 595__ $$aLANL EDS
001662459 65017 $$2arXiv$$aNuclear Physics - Experiment
001662459 690C_ $$aARTICLE
001662459 690C_ $$aCERN
001662459 695__ $$9LANL EDS$$anucl-ex
001662459 700__ $$aBillowes, J.$$uManchester U.
001662459 700__ $$aBissell, M.L.$$uLeuven U.
001662459 700__ $$aBudincevic, I.$$uLeuven U.
001662459 700__ $$aCocolios, T.E.$$uManchester U.$$uCERN
001662459 700__ $$aDe Groote, R.P.$$uLeuven U.
001662459 700__ $$aDe Schepper, S.$$uLeuven U.
001662459 700__ $$aFedosseev, V.N.$$uCERN
001662459 700__ $$aFlanagan, K.T.$$uManchester U.
001662459 700__ $$aFranchoo, S.$$uOrsay, IPN
001662459 700__ $$aRuiz, R.F.Garcia$$uLeuven U.
001662459 700__ $$aHeylen, H.$$uLeuven U.
001662459 700__ $$aMarsh, B.A.$$uCERN
001662459 700__ $$aNeyens, G.$$uLeuven U.
001662459 700__ $$aProcter, T.J.$$uManchester U.
001662459 700__ $$aRossel, R.E.$$uMainz U., Inst. Phys.$$uCERN
001662459 700__ $$aRothe, S.$$uCERN$$uMainz U., Inst. Phys.
001662459 700__ $$aStrashnov, I.$$uManchester U.
001662459 700__ $$aStroke, H.H.$$uNew York U.
001662459 700__ $$aWendt, K.D.A.$$uMainz U., Inst. Phys.
001662459 773__ $$c011055$$oPhys. Rev. X 4 , 011055 (2014)$$pPhys. Rev. X$$v4$$y2014
001662459 8564_ $$uhttp://arxiv.org/pdf/1402.4266.pdf$$yPreprint
001662459 8564_ $$81235007$$s1905305$$uhttp://cds.cern.ch/record/1662459/files/PhysRevX.4.011055.pdf$$yAPS Open Access article
001662459 8564_ $$81235007$$s2648976$$uhttp://cds.cern.ch/record/1662459/files/PhysRevX.4.011055.pdf?subformat=pdfa$$xpdfa$$yAPS Open Access article
001662459 8564_ $$82307706$$s1612952$$uhttp://cds.cern.ch/record/1662459/files/arXiv:1402.4266.pdf
001662459 8564_ $$82307699$$s22148$$uhttp://cds.cern.ch/record/1662459/files/CRIS_Fr_King_plot.png$$y00011 A King plot for the extraction of atomic factors $F$ and $M$ for the 422.7-nm transition. See text for details.
001662459 8564_ $$82307700$$s12963$$uhttp://cds.cern.ch/record/1662459/files/Fr202_decay_scheme.png$$y00008 The radioactive decay of $^{202}$Fr and its isomer~\cite{DeWitte2005}.
001662459 8564_ $$82307701$$s24589$$uhttp://cds.cern.ch/record/1662459/files/CRIS_Fr_GF_Even_Option.png$$y00016 $g$-factors for francium isotopes with even-A~\cite{Ekstrom1986}: ground state (blue), spin (7$^+$) state (green) and spin (10$^-$) state (red). The $g$-factor for the coupling of the proton and neutron orbitals have been calculated empirically. See text for details.
001662459 8564_ $$82307702$$s18330$$uhttp://cds.cern.ch/record/1662459/files/DSS_Fr202_LANDS.png$$y00009 Alpha-particle spectroscopy of (blue) $^{202g}$Fr and (red) $^{202m}$Fr allowed the hyperfine peaks in Fig.~\ref{fig:CRIS_Fr202} to be identified. The laser was detuned by (a) 13.760~GHz (peak A, $^{202g}$Fr) and (b) 20.950~GHz (peak B, $^{202m}$Fr) relative to the centroid frequency of $^{221}$Fr.
001662459 8564_ $$82307703$$s40193$$uhttp://cds.cern.ch/record/1662459/files/CRIS_CR_Rn_Fr_beta_Option.png$$y00013 Mean-square charge radii of the francium (circle) isotopes~\cite{Ekstrom1986} presented alongside the radon (diamond) isotopes~\cite{Borchers1987}. The dashed lines represent the prediction of the droplet model for given iso-deformation~\cite{Myers1983}. The data were calibrated using $\beta_2$($^{213}$Fr)$=0.062$, evaluated from the energy of the $2^+_1$ state in $^{212}$Rn~\cite{Raman2001}. Option 1 and 2 for the (7$^+$) and (10$^-$) states in $^{206}$Fr are based on the isomeric identification given in Fig.~\ref{fig:CRIS_Fr206}.
001662459 8564_ $$82307704$$s40537$$uhttp://cds.cern.ch/record/1662459/files/CRIS_CR_Pb_Fr_beta_Option.png$$y00012 Mean-square charge radii of the francium (circle) isotopes~\cite{Ekstrom1986} presented alongside the lead (diamond) isotopes~\cite{Anselment1986}. The dashed lines represent the prediction of the droplet model for given iso-deformation~\cite{Myers1983}. The data were calibrated by using $\beta_2$($^{213}$Fr)$=0.062$, evaluated from the energy of the $2^+_1$ state in $^{212}$Rn~\cite{Raman2001}. Option 1 and 2 for the (7$^+$) and (10$^-$) states in $^{206}$Fr are based on the isomeric identification given in Fig.~\ref{fig:CRIS_Fr206}.
001662459 8564_ $$82307705$$s51395$$uhttp://cds.cern.ch/record/1662459/files/DSS_Fr204_HFS.png$$y00006 Alpha-tagged hyperfine structure of (a) $^{204g}$Fr spin 3$^{(+)}$ ground state, (b) $^{204m1}$Fr spin (7$^+$) isomer, and (c) $^{204m2}$Fr spin (10$^-$) isomer. Additional peaks are discussed in the text.
001662459 8564_ $$82307707$$s38573$$uhttp://cds.cern.ch/record/1662459/files/CRIS_Fr206_Options.png$$y00010 Collinear resonance ionization spectroscopy of $^{206}$Fr relative to $^{221}$Fr. (a) Option 1: Peak A is assigned to $^{206m2}$Fr and peak B to $^{206m1}$Fr. (b) Option 2: Peak A is assigned to $^{206m1}$Fr and peak B to $^{206m2}$Fr.
001662459 8564_ $$82307708$$s19360$$uhttp://cds.cern.ch/record/1662459/files/DSS_Fr204m2_alpha.png$$y00004 Alpha-particle spectroscopy of the (10$^-$) state of $^{204m2}$Fr. The decay of $^{204m2}$Fr to $^{204m1}$Fr via an E3 IT is observed through the presence of $^{204m1}$Fr alpha particles of 6969~keV (denoted by $\star$). The laser was detuned by 43.258~GHz relative to the centroid frequency of $^{221}$Fr.
001662459 8564_ $$82307709$$s18725$$uhttp://cds.cern.ch/record/1662459/files/CRIS_Fr_GF_Odd.png$$y00014 $g$-factors for francium (blue)~\cite{Ekstrom1986, Gomez2008} and thallium (red) isotopes with odd-A~\cite{Stone2011}. The $g$-factors for the $\pi$3s$_{1/2}$ and $\pi$1h$_{9/2}$ proton orbitals have been calculated empirically. See text for details.
001662459 8564_ $$82307710$$s78569$$uhttp://cds.cern.ch/record/1662459/files/Schematic.png$$y00000 Schematic diagram of the CRIS beam line. Laser ions can be deflected to a copper plate and the corresponding secondary electrons detected by the MCP, or implanted into a carbon foil for alpha-decay spectroscopy. (Inset) The decay spectroscopy station (DSS) `windmill' system for alpha-decay tagging.
001662459 8564_ $$82307711$$s14206$$uhttp://cds.cern.ch/record/1662459/files/DSS_Fr204_HFS_3D.png$$y00005 A two-dimensional histogram of the alpha-particle energy as the hyperfine structure of $^{204}$Fr is probed. (Top) Projection of the frequency axis. The total number of alpha particles detected at each laser frequency reveals the hyperfine structure of $^{204}$Fr.
001662459 8564_ $$82307712$$s25603$$uhttp://cds.cern.ch/record/1662459/files/CRIS_Fr202.png$$y00007 Collinear resonance ionization spectroscopy of $^{202}$Fr relative to $^{221}$Fr. The hyperfine structure of the (3$^+$) ground state of $^{202g}$Fr is shown in blue and the (10$^-$) state of $^{202m}$Fr is shown in red.
001662459 8564_ $$82307713$$s30239$$uhttp://cds.cern.ch/record/1662459/files/DSS_Fr204_LANDS.png$$y00003 Alpha-particle spectroscopy of (blue) $^{204g}$Fr, (green) $^{204m1}$Fr and (red) $^{204m2}$Fr allowed the hyperfine peaks in Fig.~\ref{fig:CRIS_Fr204} to be identified. The laser was detuned by 11.503~GHz (peak A, $^{204g}$Fr), 8.508~GHz (peak B, $^{204m1}$Fr) and 18.693~GHz (peak C, $^{204m2}$Fr) relative to the centroid frequency of $^{221}$Fr.
001662459 8564_ $$82307714$$s22622$$uhttp://cds.cern.ch/record/1662459/files/CRIS_Fr_GF_Odd_zoom.png$$y00015 Close up of the $g$-factors for francium (blue)~\cite{Ekstrom1986, Gomez2008}, bismuth (green)~\cite{Stone2011} and thallium (red) isotopes~\cite{Barzakh2012} with odd-A. The $g$-factor for the $\pi$1h$_{9/2}$ proton orbital has been calculated empirically. See text for details.
001662459 8564_ $$82307715$$s40300$$uhttp://cds.cern.ch/record/1662459/files/CRIS_Fr204.png$$y00001 Collinear resonance ionization spectroscopy of $^{204}$Fr relative to $^{221}$Fr. The hyperfine structure of the 3$^{(+)}$ ground state of $^{204g}$Fr is shown in blue, the 7$^+$ state of $^{204m1}$Fr is shown in green and the (10$^-$) state of $^{204m2}$Fr is shown in red.
001662459 8564_ $$82307716$$s26624$$uhttp://cds.cern.ch/record/1662459/files/Fr204_decay_scheme.png$$y00002 The radioactive decay of $^{204}$Fr and its isomers~\cite{Huyse1992, Uusitalo2005, Jakobsson2013}.
001662459 916__ $$sn$$w201407
001662459 960__ $$a13
001662459 980__ $$aARTICLE