On the decrease in charge radii of multi-quasi particle isomers

Bissell, M. L.; Flanagan, K.T.; Gardner, M.; Avgoulea, M.; Billowes, J.; Campbell, P.; Cheal, B.; Eronen, T.; Forest, D. H.; Huikari, J.; Jokinen, A.; Moore, I. D.; Nieminen, A.; Penttilä, H.; Rinta‐Antila, S.; Tordoff, B.; Tungate, G.; Äystö, J.

doi:10.1016/j.physletb.2006.12.054

Cited by 37 publications

(26 citation statements)

References 25 publications

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“…With the recent installation of a linear gas-filled radio frequency quadrupole Paul trap (named ISCOOL) [17,18], radioactive ions can be cooled and bunched at ISOLDE. Its application for collinear laser spectroscopy has been demonstrated in Jyväskylä (Finland) where rare isotopes with yields down to 150 s À1 have been studied with fluorescent photon detection on a bunched ion beam [19,20]. The ISCOOL device is located after the highresolution separator on a high-voltage platform floated at 30 kV.…”

mentioning

confidence: 99%

Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3
Flanagan¹,
Vingerhoets²,
Avgoulea³
et al. 2009
Phys. Rev. Lett.
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We report the first confirmation of the predicted inversion between the 2p 3=2 and 1f 5=2 nuclear states in the g 9=2 midshell. This was achieved at the ISOLDE facility, by using a combination of insource laser spectroscopy and collinear laser spectroscopy on the ground states of 71;73;75 Cu, which measured the nuclear spin and magnetic moments. Much of the current effort in nuclear physics is focused on determining how the nuclear shell structure is changing in neutron-rich nuclei. This has been triggered by the observation of unexpected phenomena in several neutronrich isotopes, since radioactive ion beams of such nuclei became available more than three decades ago. In the lighter elements (e.g., He, Li, Be), neutron halos and skins were observed. Around the neutron-rich 32 Mg region an ''island of inversion'' was discovered. In the neutron-rich region towards doubly magic 78 Ni, a sudden drop in the position of the first excited 5=2 À state in 71;73 Cu isotopes was observed more than a decade ago [1]. The lowering of the 5=2 À energy from above 1 MeV in 69 Cu to 166 keV in 73 Cu suggested that this state might become the ground state in 75 Cu. The migration of this level, associated with the occupation of the 1f 5=2 single-particle orbital, was attributed to a strong attractive monopole interaction that becomes active when neutrons occupy the 1g 9=2 orbital [2]. Such monopole interactions exist also in near-stable nuclei, but their impact on the evolution of shell structure and shell gaps in far-from-stability nuclei remained unnoticed until recently [3]. Also in other neutron-rich regions dramatic monopole shifts were observed when valence neutrons and protons are occupying orbits having their orbital and spin angular momentum, respectively, aligned and antialigned. It is now understood that one of the physics mechanisms driving these monopole shifts is the tensor part of the residual nucleon-nucleon interaction [4]. A steep lowering of the 1=2 À level from about 1 MeV in 69 Cu down to 135 keV in 73 Cu has also been observed [5,6]. Thus this level is also a potential ground-state candidate in 75 Cu. While most shell-model interactions do reproduce a lowering of the 5=2 À level and predict an inversion with the normal 3=2 À ground state somewhere between 73 Cu and 79 Cu [4,[7][8][9][10], none of them reproduce the lowering of the 1=2 À state. Some significant physics mechanism is either omitted or seriously underestimated in each of the recently developed shell-model interactions. Therefore, experimental establishment of ground-and excited-state nuclear spins and the properties of their wave function (through spectroscopic factors, magnetic moments, transition moments, etc.) is a crucial step in PRL 103,

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confidence: 99%

Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3
Flanagan¹,
Vingerhoets²,
Avgoulea³
et al. 2009
Phys. Rev. Lett.
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157
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“…In the first, the 154-keV transition was balanced against the sum of 115-and 209-keV transition intensities in a sum of (143,166,309)/916-keV double gated spectra, leading to α T (154) = 0.07 (31). In the second, the 154-and 166-keV transitions were balanced in a spectrum produced from a sum of 143/(780,818,916,932)-keV double gates, leading to α T (154) = 0.04 (27). Predicted values of 0.11 (E1), 0.90 (M1), 0.63 (E2) and 5.9 (M2) confirm an E1 assignment.…”

Section: /2 + [411] Ground State Bandmentioning

confidence: 99%

“…The in-band properties for measured rotational bands in 173 Tm and 175 Tm are presented in Tables IV and V. Table VI a Taking Q 0 = 7.3(2) eb [27].…”

Section: Propertiesmentioning

confidence: 99%

High-spin structure,Kisomers, and state mixing in the neutron-rich isotopes173Tm and175Tm

et al. 2012

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“…Usually, atomic transitions are selected for experimental study on the grounds of their spectroscopic efficiency and sensitivity. Collinear laser spectroscopy typically has the capability to access exotic isotopes which have ion currents from around 100 s −1 [24]. However, in principle it is possible to identify transitions where MCDF calculations are easier or more reliable.…”

Section: Introductionmentioning

confidence: 99%

Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

et al. 2018

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Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes Vormawah, L. J.; Vilén, Markus; Beerwerth, R.; Campbell, P.; Cheal, B.; Dicker, A.; Eronen, Tommi; Fritzsche, S.; Geldhof, Sarina; Jokinen, Ari; Kelly, S.; Moore, Iain; Reponen, Mikael; Rinta-Antila, Sami; Stock, S. O.; Voss, Annika Vormawah, L. J., Vilén, M., Beerwerth, R., Campbell, P., Cheal, B., Dicker, A., . . . Voss, A. (2018 Collinear laser spectroscopy has been performed on doubly charged ions of radioactive yttrium in order to study the isotope shifts of the 294.6-nm 5s 2 S 1/2 → 5p 2 P 1/2 line. The potential of such an alkali-metal-like transition to improve the reliability of atomic-field-shift and mass-shift factor calculations, and hence the extraction of nuclear mean-square radii, is discussed. Production of yttrium ion beams for such studies is available at the IGISOL IV Accelerator Laboratory, Jyväskylä, Finland. This newly recommissioned facility is described here in relation to the on-line study of accelerator-produced short-lived isotopes using collinear laser spectroscopy and application of the technique to doubly charged ions.

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On the decrease in charge radii of multi-quasi particle isomers

Cited by 37 publications

References 25 publications

Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3
Flanagan¹,
Vingerhoets²,
Avgoulea³
et al. 2009
Phys. Rev. Lett.
Self Cite
157
6
64
0
View full text Add to dashboard Cite

Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3
Flanagan¹,
Vingerhoets²,
Avgoulea³
et al. 2009
Phys. Rev. Lett.
Self Cite
157
6
64
0
View full text Add to dashboard Cite

High-spin structure,Kisomers, and state mixing in the neutron-rich isotopes173Tm and175Tm

Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

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On the decrease in charge radii of multi-quasi particle isomers

Cited by 37 publications

References 25 publications

Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3Flanagan1, Vingerhoets2, Avgoulea3 et al. 2009Phys. Rev. Lett.Self Cite1576640View full textAdd to dashboardCite

Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3Flanagan1, Vingerhoets2, Avgoulea3 et al. 2009Phys. Rev. Lett.Self Cite1576640View full textAdd to dashboardCite

High-spin structure,Kisomers, and state mixing in the neutron-rich isotopes173Tm and175Tm

Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

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Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3
Flanagan¹,
Vingerhoets²,
Avgoulea³
et al. 2009
Phys. Rev. Lett.
Self Cite
157
6
64
0
View full text Add to dashboard Cite

Nuclear Spins and Magnetic Moments ofCu71,73,75: Inversion ofπ2p3
Flanagan¹,
Vingerhoets²,
Avgoulea³
et al. 2009
Phys. Rev. Lett.
Self Cite
157
6
64
0
View full text Add to dashboard Cite