Spectroscopy of the proton drip-line nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>203</mml:mn></mml:msup></mml:math>Fr

Jakobsson, U.; Juutinen, S.; Uusitalo, J.; Leino, M.; Auranen, K.; Enqvist, T.; Greenlees, P. T.; Hauschild, K.; Jones, P.; Julin, R.; Ketelhut, S.; Kuusiniemi, P.; Nyman, M.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sarén, J.; Scholey, C.; Sorri, J.

doi:10.1103/physrevc.87.054320

Cited by 29 publications

(31 citation statements)

References 55 publications

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“…We note that an isomeric state with spin and parity 13/2 + decaying through an M2 internal transition to the 9/2 − ground state was observed in 203 Fr at E * = 426 keV with T 1/2 = 0.37(5) μs [ 8] and in 205 Fr at E * = 544 keV with T 1/2 = 80(20) ns [9]. The estimated energy range for the excitation energy of the isomer in 201 Fr, ∼(101-300) keV, confirms the trend of the decreasing excitation energy of the 13/2 + isomer with decreasing N in odd-A francium isotopes (see Fig.…”

Section: Discussionmentioning

confidence: 99%

“…An intruder 1/2 + state was identified in 201,203 Fr using α-decay spectroscopy [7]. Isomeric 1/2 + and 13/2 + states were observed in 203 Fr [8] and 205 Fr [9] using prompt in-beam γ -ray, delayed γ -ray, and electron spectroscopy, in addition to α-decay * zdenka.kalaninova@fmph.uniba.sk studies. Both the 1/2 + and 13/2 + states are assumed to possess oblate deformations and to coexist with the spherical 9/2 − ground state [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Decay of201–203Raand200–202Fr

et al. 2014

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decay of201–203Raand200–202Fr

et al. 2014

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“…þ state has been observed as an isomer [16][17][18]. This state has been reported to invert with the ground state in 199 Fr leading to an onset of groundstate deformation below N ¼ 113 [19,20].…”

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confidence: 95%

Collinear Resonance Ionization Spectroscopy of Neutron-Deficient Francium Isotopes

et al. 2013

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The magnetic moments and isotope shifts of the neutron-deficient francium isotopes [202][203][204][205] Fr were measured at ISOLDE-CERN with use of collinear resonance ionization spectroscopy. A production-todetection efficiency of 1% was measured for 202 Fr. The background from nonresonant and collisional ionization was maintained below one ion in 10 5 beam particles. There are surprisingly few nuclear observables with which theorists can elucidate the nuclear force and interacting many-fermion problem. The laser spectroscopy technique reported here has measured two of these (the magnetic moment and mean-square charge radius) via the hyperfine interaction and isotope shift. This is achieved without introducing assumptions associated with any particular approach, making these measurements suitable for testing modern nuclear models. A variety of laser spectroscopy techniques now exists for studying shortlived radioactive isotopes, which broadly focus on either high resolution (< 100 MHz linewidth) or high sensitivity (< 1 atom=s) [1,2].We report here the first measurements of 202;203;205 Fr, reaching 11 neutrons from the N ¼ 126 shell closure. This has been made possible by a new highly sensitive, highresolution technique of bunched collinear-beam resonance ionization spectroscopy (CRIS). The CRIS technique combines for the first time velocity bunching (provided by the collinear geometry [3,4]) and time bunching (to eliminate the duty loss of required pulsed laser systems). The high sensitivity is reached through a combination of the excellent overlap of laser and beam, and the high quantum efficiency of ion detectors. This new technique may be applied generally to all nuclides, but it is at the limits of nuclear stability that it will manifest its particular advantages.The CRIS method was first proposed more than 30 years ago [5], and its sub-Doppler resolution was demonstrated by Schultz et al., who measured the radioactive isotopes of ytterbium [6]. Since these isotopes were produced as a continuous beam, the duty cycle losses associated with pulsed lasers introduced a loss in efficiency by a factor of 30, which contributed to a low total experimental efficiency of 0.001%. With the installation of a gas-filled radio frequency quadrupole ion trap (ISCOOL) at ISOLDE, bunched ion beams that match the duty cycle of the pulsed lasers are now available [7]. This motivated the development of a dedicated experiment to exploit the CRIS technique applied to time-bunched beams. In the present case it allowed for the first time measurements of the neutrondeficient francium isotopes with half-lives as short as 300 ms and production rates below 100 atoms=s.In our work the francium isotopes were produced through spallation reactions induced by 1.4 GeV protons, incident on a high temperature uranium carbide target (2000 C) and surface ionized (ionization potential 4.07 eV [8]) with use of a tantalum ionizer tube. A schematic of the experiment is presented in Fig. 1. The beam was accelerated to 50 keV, mass separated, and sub...

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“…The electron capture properties presented in [13] [5]. In odd-Z nuclei above shell closures the low-lying states are often compared to the low-lying states in their lighter even-Z isotones (see, for example, [7,8,29,47]). In this case the 1 /2 + state, being a proton-hole state, can be described as a proton hole in the radon core, hence a comparison to a heavier even-Z isotone is reasonable.…”

Section: Discussionmentioning

confidence: 99%

“…The corresponding state is also known in a few francium nuclei. It is an isomeric excited state in odd-mass isotopes [201][202][203][204][205] Fr [6][7][8], and in 199 Fr it may become the ground state [6,9,10]. The level patterns above these states are of interest.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of isomeric intruder 12+ states in At197,203

et al. 2017

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A newly observed isomeric intruder 1 /2 + state [T1 /2 = 3.5(6) ms] is identified in 203 At using a gas-filled recoil separator and fusion-evaporation reactions. The isomer is depopulated through a cascade of E3 and mixed M1/E2 transitions to the 9 /2 − ground state, and it is suggested to originate from the π (s1 /2 ) −1 configuration. In addition, the structures above the 1 /2 + state in 203 At and 197 At are studied using in-beam γ -ray spectroscopy, recoil-decay tagging, and recoil-isomer decay tagging methods. The 1 /2 + state is fed from 3 /2 + and 5 /2 + states, and the origin of these states are discussed.

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Spectroscopy of the proton drip-line nucleus203Fr

Abstract: The nucleus 203 Fr has been studied through γ -ray and electron spectroscopy, using the recoil-decay tagging technique. A 13/2 + state, with a half-life of 0.37 (5)

Cited by 29 publications

References 55 publications

Decay of201–203Raand200–202Fr

Decay of201–203Raand200–202Fr

Collinear Resonance Ionization Spectroscopy of Neutron-Deficient Francium Isotopes

Experimental study of isomeric intruder 12+ states in At197,203

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