Isotope shifts and hyperfine structure of 38–47K by laser spectroscopy

Touchard, F.; Guimbal, P.; Büttgenbach, S.; Klapisch, R.; Simon, M. de Saint; Serre, Josiane; Thibault, C.; Duong, H. T.; Juncar, P.; Liberman, S.; Pinard, J.; Vialle, Jean

doi:10.1016/0370-2693(82)91167-4

Cited by 82 publications

(71 citation statements)

References 11 publications

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“…In the odd-A K (Z 20 1 = -) and Cu (Z 28 1 = + ) isotopes it had been observed that the first-excited-state energy decreases dramatically with an increasing number of neutrons between N=20 and 28 in potassium and beyond N=40 in copper. In the K isotopes the energy of the 1/2 + level (due to a hole in the πs 1 2 orbital) decreases gradually as the νf 7 2 level is being filled and this level becomes the ground state in 47 K [73]. In the Cu isotopes the 5/2 − level energy (due to a proton in the πf 5 2 level) was seen to decrease between 69 Cu and 73 Cu [74], as the νg 9 2 is being filled.…”

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

“…In the K isotopes the energy of the 1/2 + level (due to a hole in the πs 1 2 orbital) decreases gradually as the νf 7 2 level is being filled and this level becomes the ground state in 47 K [73]. In the Cu isotopes the 5/2 − level energy (due to a proton in the πf 5 2 level) was seen to decrease between 69 Cu and 73 Cu [74], as the νg 9 2 is being filled. In 2005 Otsuka et al explained this monopole migration of single-particle levels as due to the tensor part of the nucleon-nucleon monopole interaction, and they provided an intuitive explanation as to where and how this monopole migration would occur in the nuclear chart [75].…”

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

“…Up to 79 Ga the ground state spin is 3/2 − , except for 73 Ga (N = 42) where the ground state was measured to be 1/2 − , contrary to the earlier reported 3/2 − . From the measured magnetic and quadrupole moments it could be inferred that the ground state wave functions gradually change from three protons in the πp 3 2 orbit for the stable 69,71 Ga to a very mixed wave function for the 1/2 − ground state in 73 Ga. The moments of 75,77 Ga are consistent with two protons in πf 5 2 and one proton in πp 3 2 , while the full inversion of the proton f 5 2 and p 3 2 level occupations occurs in 79 Ga (N = 48) which has a leading πf 5 2 3 configuration, coupled to spin 3/2.…”

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

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Collinear laser spectroscopy at ISOLDE: new methods and highlights

Neugart

Billowes

Bissell

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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Over three and a half decades of collinear laser spectroscopy and the COL-LAPS setup have played a major role in the ISOLDE physics programme. Based on a general experimental principle and diverse approaches towards higher sensitivity, it has provided unique access to basic nuclear properties such as spins, magnetic moments and electric quadrupole moments as well as isotopic variations of nuclear mean square charge radii. While previous methods of outstanding sensitivity were restricted to selected chemical elements with special atomic properties or nuclear decay modes, recent developments have yielded a breakthrough in sensitivity for nuclides in wide mass ranges. These developments include the use of bunched beams from the radiofrequency quadrupole cooler-buncher ISCOOL, which allows a suppression of background by several orders of magnitude. Very recently, the combination of collinear laser spectroscopy with the principle of laser resonance ionisation took shape in the new CRIS setup, providing a very selective and efficient detection of optical resonance. We outline the basic experimental developments and discuss important results on nuclei or chains of isotopes in different mass ranges.

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Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

Section: New Methods and Highlights Since 2000mentioning

confidence: 99%

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Collinear laser spectroscopy at ISOLDE: new methods and highlights

Neugart

Billowes

Bissell

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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“…This symmetry is not reproduced by the radii behaviour of the neighbouring elements. The shape asymmetry of the δ r 2 curves for the elements with Z > 20 and Z < 20 occurs in opposite directions: for the Ti chain (Z = 22) there is a steady increase of the charge radii towards N = 20 [5], whereas for the chains with Z = 18, 19 the radii increase towards N = 28 [2,4]. The oddeven staggering (OES) effect decreases away from calcium, to argon or titanium, but is smallest for the odd-Z element potassium.…”

Section: Introductionmentioning

confidence: 97%

Nuclear charge radii and electromagnetic moments of radioactive scandium isotopes and isomers

Avgoulea¹,

Gangrsky²,

Marinova³

et al. 2011

J. Phys. G: Nucl. Part. Phys.

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Abstract. Collinear laser spectroscopy experiments with the Sc + transition 3d4s 3 D 2 → 3d4p 3 F 3 at λ = 363.1 nm were performed on the 42−46 Sc isotopic chain using an ion guide isotope separator with a cooler-buncher. Nuclear magnetic dipole and electric quadrupole moments as well as isotope shifts were determined from the hyperfine structure for five ground states and two isomers. Extensive multi-configurational Dirac-Fock calculations were performed in order to evaluate the specific mass-shift, M SMS , and field-shift, F , parameters which allowed evaluation of the charge radii trend of the Sc isotopic sequence. The charge radii obtained show systematics more like the Ti radii, which increase towards the neutron shell closure N = 20, than the symmetric parabolic curve for Ca. The changes in mean square charge radii of the isomeric states relative to the ground states for 44 Sc and 45 Sc were also extracted. The charge radii difference between the ground and isomeric states of 45 Sc is in agreement with the deformation effect estimated from the B(E2) measurements but is smaller than the deformation extracted from the spectroscopic quadrupole moments.

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“…In the vicinity of this region the information about radii is rather scarce. Isotope shift measurements on 38 47 K [11] just include one nucleus of the sd-shell (Z;N < 20). The corresponding 39 Ca has been investigated recently [12], and a similar collinear laser spectroscopy experiment on 50 Ca has extended the calcium data into the 2p 3=2 -subshell beyond N = 28 [13].…”

Section: Introductionmentioning

confidence: 99%

Moments and mean square charge radii of short-lived argon isotopes

et al. 1996

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We report on the measurement of optical isotope shifts for 32 40 Ar and for 46 Ar from which the changes in mean square nuclear charge radii across the N = 20 neutron shell closure are deduced. The investigations were carried out by collinear laser spectroscopy in fast beams of neutral argon atoms. The ultra-sensitive detection combines optical pumping, stateselective collisional ionization and counting of -radioactivity. By reaching far into the sd-shell, the results add new information to the systematics of radii in the calcium region (Z 20). Contrary to all major neutron shell closures with N 28, the N = 20 shell closure causes no signicant slope change in the development of the radii. Information from the hyperne structure of the odd-A isotopes includes the magnetic moments of 33 Ar (I = 1 = 2) and 39 Ar (I = 7 = 2), and the quadrupole moments of 35 Ar, 37 Ar (I = 3 = 2) and 39 Ar. The electromagnetic moments are compared to shell-model predictions for the sd-and fp-shell. Even far from stability a v ery good agreement between experiment and theory is found for these quantities. The mean square charge radii are discussed in the framework of spherical SGII Skyrme-type Hartree-Fock calculations.Keywords: NUCLEAR STRUCTURE 32 40;46 Ar; measured isotope shifts, hfs; deduced hyperne constants, spins I, magnetic dipole moments , electric quadrupole moments Q s , mean square charge radii hr 2 i; Collinear fast-beam laser spectroscopy, collisional ionization and -detection; shell model (sd-, fp-shell).

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Isotope shifts and hyperfine structure of 38–47K by laser spectroscopy

Cited by 82 publications

References 11 publications

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Nuclear charge radii and electromagnetic moments of radioactive scandium isotopes and isomers

Moments and mean square charge radii of short-lived argon isotopes

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