Nuclear Shape Staggering in Very Neutron-Deficient Hg Isotopes Detected by Laser Spectroscopy

Kühl, T.; Dabkiewicz, P.; Duke, C.; Fischer, H.; Kluge, H. J.; Kremmling, H.; Otten, Ernst W.

doi:10.1103/physrevlett.39.180

Cited by 103 publications

(21 citation statements)

References 25 publications

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“…In 180 Hg, two possible candidates for the 4 + 2 state are present: the 1203 and 1223 keV levels. The latter is more strongly fed in the β decay of 180 Tl, suggesting that if the ground-state spin of 180 Tl is indeed (4,5), this would have a higher probability of being the 4 + 2 state. However, by looking at the γ intensities of the transitions originating from these levels and comparing them with those of the 1080 keV level in 186 Hg, the 1203 keV level shows closer resemblance to the heavier mercury isotopes, and this would suggest this is the 4 + 2 level in 180 Hg.…”

Section: B Systematics Of Even Mercury Isotopesmentioning

confidence: 99%

“…Shape coexistence in the neutron-deficient mercury nuclei has been observed by using different techniques, ranging from optical [4] and laser spectroscopy [5,6] to in-beam spectroscopy [7,8] and decay spectroscopy [9,10]. A wealth of new data has become available recently through lifetime measurements [11,12] and by using new techniques such as Coulomb excitation of postaccelerated radioactive beams [13].…”

Section: Introductionmentioning

confidence: 99%

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Shape coexistence in180Hg studied through theβdecay of180Tl

Elseviers¹,

Andreyev²,

Antalic³

et al. 2011

Phys. Rev. C

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The β + /EC decay of 180 Tl and excited states in the daughter nucleus 180 Hg have been investigated at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. Many new low-lying energy levels were observed in 180 Hg, of which the most significant are the 0 + 2 at 419.6 keV and the 2 + 2 at 601.3 keV. The former is the bandhead of an excited band in 180 Hg assumed originally to be of prolate nature. From the β feeding to the different states in 180 Hg, the ground-state spin of 180 Tl was deduced to be (4 − ,5 − ).

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Section: B Systematics Of Even Mercury Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shape coexistence in180Hg studied through theβdecay of180Tl

Elseviers¹,

Andreyev²,

Antalic³

et al. 2011

Phys. Rev. C

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“…Our recent activity in this field has revisited the neutron-deficient Au and Hg isotopes, which were first studied at ISOLDE approximately four decades ago: the very first optical spectroscopy experiments performed at an ISOL facility [89][90][91][92]. This early work was instrumental in the discovery of the shape co-existence phenomenon and revealed two of the most striking examples of sudden nuclear shape changes in the known nuclear chart: the dramatic odd-even shape staggering of the neutron-deficient Hg isotopes, and the abrupt and pronounced shape change of the Au nuclei isotopes.…”

Section: In-source Rismentioning

confidence: 99%

Ion beam production and study of radioactive isotopes with the laser ion source at ISOLDE

Fedosseev

Wendt

Rothe

et al. 2017

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

128

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Ion beam production and study of radioactive isotopes with the laser ion source at ISOLDE At ISOLDE the majority of radioactive ion beams are produced using the resonance ionization laser ion source (RILIS). This ion source is based on resonant excitation of atomic transitions by wavelength tunable laser radiation.Since its installation at the ISOLDE facility in 1994, the RILIS laser setup has been developed into a versatile remotely operated laser system comprising state-of-the-art solid state and dye lasers capable of generating multiple high quality laser beams at any wavelength in the range of 210-950 nm. A continuous programme of atomic ionization scheme development at CERN and at other laboratories has gradually increased the number of RILIS-ionized elements. At present, isotopes of 40 different elements have been selectively laser-ionized by the ISOLDE RILIS. Studies related to the optimization of the laser-atom interaction environment have yielded new laser ion source types: the laser ion source and trap and the versatile arc discharge and laser ion source. Depending on the specific experimental requirements for beam purity or versatility to switch between different ionization mechanisms, these may offer a favourable alternative to the standard hot metal cavity configuration. In addition to its main purpose of ion beam production, the RILIS is used for laser spectroscopy of radioisotopes. In an ongoing experimental campaign the isotope shifts and hyperfine structure of long isotopic chains have been measured by the extremely sensitive in-source laser spectroscopy method. The studies performed in the lead region were focused on nuclear deformation and Made open access 7 August 2017Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.shape coexistence effects around the closed proton shell Z = 82. The paper describes the functional principles of the RILIS, the current status of the laser system and demonstrated capabilities for the production of different ion beams including the high-resolution studies of short-lived isotopes and other applications of RILIS lasers for ISOLDE experiments.

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“…However, in near-closed-shell nuclei, simple structures may occur as a result of the spherical symmetry breaking up. The cadmium isotopic chain studied here appears to provide one such instance of simplicity.Already [4,5] or states in the same nucleus [6]. Thus far, radial changes of such magnitude appear to be uncommon, the other prominent examples being the halo structures in light nuclei [7][8][9][10][11] and the onset of deformation at N ¼ 60 [12][13][14][15][16].…”

mentioning

confidence: 99%

Simple Nuclear Structure inCd111–129from Atomic Isomer Shifts

et al. 2016

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Isomer shifts have been determined in [111][112][113][114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129] Cd by high-resolution laser spectroscopy at CERN-ISOLDE. The corresponding mean square charge-radii changes, from the 1=2 þ and the 3=2 þ ground states to the 11=2 − isomers, have been found to follow a distinct parabolic dependence as a function of the atomic mass number. Since the isomers have been previously associated with simplicity due to the linear mass dependence of their quadrupole moments, the regularity of the isomer shifts suggests a higher order of symmetry affecting the ground states in addition. A comprehensive description assuming nuclear deformation is found to accurately reproduce the radii differences in conjunction with the known quadrupole moments. This intuitive interpretation is supported by covariant density functional theory. DOI: 10.1103/PhysRevLett.116.032501 Complexity is known to dominate the nuclear state, hence, sustaining the need for theoretical input to nearly every experimental work in order to disentangle the nuclear problem down to a set of basic concepts, e.g., shell structure, pairing, "magic" numbers, deformation, etc. However, in near-closed-shell nuclei, simple structures may occur as a result of the spherical symmetry breaking up. The cadmium isotopic chain studied here appears to provide one such instance of simplicity.Already [4,5] or states in the same nucleus [6]. Thus far, radial changes of such magnitude appear to be uncommon, the other prominent examples being the halo structures in light nuclei [7][8][9][10][11] and the onset of deformation at N ¼ 60 [12][13][14][15][16]. Cadmium and mercury are analogues in terms of their charge distributions since both incorporate an open shell with two protons less than a magic number, respectively, Z ¼ 50 and Z ¼ 82. Despite the similarities, the cadmium case presented here shows no abrupt changes of the nuclear size. Instead, one observes a small-to-moderate effect on the radii characterized by regularity which may be attributed to the unique-parity h 11=2 orbital.In this Letter, we report on the simplicity of high-precision isomer shifts derived from collinear laser spectroscopy on the neutron-rich cadmium isotopes towards the N ¼ 82 shell closure. A comprehensive model resting on some of the basic concepts in nuclear physics suggests an apparent link between the 11=2 − radii and quadrupole moments. The credibility of such an interpretation is examined quantitatively within a relativistic mean field calculation.The work was carried out with the collinear laser spectroscopy setup at the CERN-ISOLDE radioactivebeam facility. Of interest were the odd neutron-rich

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Nuclear Shape Staggering in Very Neutron-Deficient Hg Isotopes Detected by Laser Spectroscopy

Cited by 103 publications

References 25 publications

Shape coexistence in180Hg studied through theβdecay of180Tl

Shape coexistence in180Hg studied through theβdecay of180Tl

Ion beam production and study of radioactive isotopes with the laser ion source at ISOLDE

Simple Nuclear Structure inCd111–129from Atomic Isomer Shifts

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