A new highly efficient method of atomic spectroscopy for nuclides far from stability

Alkhazov, G.; Barzakh, A. E.; Denisov, V. I.; Mezilev, K. A.; Novikov, Yu. N.; Panteleyev, V.N.; Popov, A. V.; Sudentas, Edward; Letokhov, V. S.; Mishin, V. I.; Fedoseyev, V. N.; Andreyev, Sergey; Vedeneyev, D.S.; Zyuzikov, A.D.

doi:10.1016/0168-583x(92)95309-f

Cited by 55 publications

(16 citation statements)

References 4 publications

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“…The retardation of the E3 transition in the odd-odd 186 Tl [6] is however significantly higher. This increase in hindrance factor can be related to the different nature of the stretched E3 transition as it involves configuration changes from a [π 1h 9/2 ⊗ ν1i 13 2 ) state compared to that in the (7 + 1 ). It is interesting to note that also in the hyperfine structure measurements in the same experiment, the g factor of the (7 + 1 ) state shows increased importance of the [π 2d 3/2 ⊗ ν1i 13/2 ] configuration, compared to respective g factors in the heavier odd-odd thallium isotopes [5,39].…”

Section: Discussionmentioning

confidence: 99%

“…In our study, combining the high selectivity of the Resonant Ionization Laser Ion Source (RILIS) [10][11][12] with decay spectroscopy and the in-source laser spectroscopy method [13][14][15], exotic thallium isotopes down to N = 97 have been studied at the Isotope Separator On-Line Device ISOLDE [16] CERN, Geneva, Switzerland, using the Windmill detection system [17][18][19]. Complementary decay data on isomerically purified sources were collected.…”

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

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Internal decay of the(10−)intruder state inTl184

et al. 2015

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Decay spectroscopy of 184 Tl has been performed at the CERN Isotope Separator On-Line (ISOLDE) facility. An excitation energy of 506.1(1) keV and a half-life of 47.1(7) ms of the intruder based (10 − ) state have been extracted. The internal decay characteristics of this state are determined and discussed, extending the systematics of such states in the even-mass thallium nuclei below neutron midshell at N = 104. The retardation factors of the isomeric M2 and E3 transitions are deduced and compared with retardation factors in neighboring odd-mass and even-mass thallium isotopes. The new information is combined with a review of hindered and unhindered α-decay data of [187][188][189][190][191][192] Bi populating levels in daughter nuclei [183][184][185][186][187][188] Tl and supports the interpretation of the intruder character of the (10 − ) state in 184 Tl.

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Section: Discussionmentioning

confidence: 99%

Section: Published By the American Physical Society Under The Terms Omentioning

confidence: 99%

Internal decay of the(10−)intruder state inTl184

et al. 2015

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“…Mg-During 2016, an ISOLTRAP experiment aimed to study 21 Ne and 23 Mg isotopes in the same experiment using a SiC target coupled to a VD5 VADIS [46]. On account of their atomic structure and high ionization potential, noble gases ions cannot be created by the surface or RILIS ion sources, hence the FEBIAD-type source is required for this experiment.…”

Section: Hybrid Plasma-laser Ion Source: Vadlismentioning

confidence: 99%

“…Section 4 is devoted to RILIS applications which, in addition to the standard mode of RILIS operation for efficient and selective ionization of a requested element, includes the operation of the RILIS lasers in a highresolution mode for laser probing of different isotopes and nuclear isomers of the chosen element. This highly sensitive laser spectroscopy method for the study of unstable isotopes was pioneered at LNPI [21]. At ISOLDE it was further developed as the 'in-source resonance ionization spectroscopy (RIS)' method [22] and applied in a number of experiments for the study of nuclides far from stability.…”

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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.

122

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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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“…The heavier isotope 190 Pb was measured via its -decay in a similar way using a dedicated setup. The in-source laser spectroscopy technique was first used in Gatchina [26]. More details can be found in [27,28].…”

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confidence: 99%

Nuclear Charge Radii of Neutron-Deficient Lead Isotopes BeyondN=104Midshell Investigated by In-Source Laser Spectroscopy

Witte¹,

Andreyev²,

Barré³

et al. 2007

Phys. Rev. Lett.

123

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The shape of exotic even-mass [182][183][184][185][186][187][188][189][190] Pb isotopes was probed by measurement of optical isotope shifts providing mean square charge radii (hr 2 i). The experiment was carried out at the ISOLDE (CERN) on-line mass separator, using in-source laser spectroscopy. Small deviations from the spherical droplet model are observed, but when compared to model calculations, those are explained by high sensitivity of hr 2 i to beyond mean-field correlations and small admixtures of intruder configurations in the ground state. The data support the predominantly spherical shape of the ground state of the proton-magic Z 82 lead isotopes near neutron midshell (N 104). The subtle interplay between individual and collective behavior of a finite number of strongly interacting fermions leads to aspects of mesoscopic systems that can only be studied in atomic nuclei [1]. For neutron-deficient nuclides around the closed proton shell at Z 82, this interplay leads to the appearance of states with different shapes at low excitation energy. These so-called shape coexisting states can be interpreted as particle-hole excitations across the closed proton shell gap [2] whereby the interaction of the valence proton particles and holes with the neutrons drives the nucleus into deformation. The phenomenon of shape-coexistence is subject to intensive experimental and theoretical studies [3,4]. Alpha-decay experiments have revealed a triplet of low-lying 0 states in the 186 Pb nucleus, which is located at neutron midshell between N 82 and 126 [1]. Excited bands built on top of the 0 states were observed in [182][183][184][185][186][187][188][189][190], and recent lifetime measurements confirmed the deformed character of the bands [11]. For 186 188 Pb, it was concluded that the ground state and the 2 1 state have a very different structure, the 0 ground state of predominantly spherical and the 2 1 state of predominantly prolate character. Monopole transition strengths between the 0 states were used to estimate the mixing between the normal and intruder configuration [12] and revealed limited configuration mixing in the 190;192;194 Pb ground-state wave function [13,14]. But as the excited 0 states become lower in energy when approaching N 104 ( 186 Pb), the mixing could increase substantially.Several theoretical models have been applied to describe the structure of the neutron-deficient lead isotopes with their coexisting and mixed spherical, prolate, and oblate states, such as phenomenological shape mixing calculations [13,14], symmetry guided shell model and interacting boson model truncations [15,16], and beyond mean-field approaches [4,17,18]. All models that provide a consistent picture of the available data suggest that the ground state of lead isotopes is dominated by spherical configurations, even when the prolate and oblate rotational bands come down very low in energy around N 104, and the barrier that separates the corresponding structures in the total energy surface is very small. But all models also ...

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A new highly efficient method of atomic spectroscopy for nuclides far from stability

Cited by 55 publications

References 4 publications

Internal decay of the(10−)intruder state inTl184

Internal decay of the(10−)intruder state inTl184

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

Nuclear Charge Radii of Neutron-Deficient Lead Isotopes BeyondN=104Midshell Investigated by In-Source Laser Spectroscopy

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