Isomer separation of Cu and Cu with a resonance ionization laser ion source

Köster, U.; Fedoseyev, V. N.; Mishin, V. I.; Weissman, L.; Huýse, M.; Kruglov, K.; Mueller, W. F.; Duppen, P. Van; Roosbroeck, J. Van; Thirolf, P. G.; Thomas, H. G.; Weißhaar, D.; Schulze, W.; Borcea, R.; Commara, M. La; Schatz, H.; Schmidt, K.; Röttger, Stefan; Huber, G.; Sebastian, V.; Kratz, K. L.; Catherall, R.; Georg, U.; Lettry, J.; Oinonen, M.; Ravn, H.L.; Simon, H.

doi:10.1016/s0168-583x(99)00552-2

Cited by 34 publications

(33 citation statements)

References 12 publications

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“…Following the series of experiments on the study of nuclear spins and electromagnetic moments of Cu isotopes [56,[78][79][80] the in-source RIS collaboration has performed extensive laser and nuclear-spectroscopic studies of isotopes in the lead region, namely the Tl [81], Pb [70,[82][83][84], Hg [45], Bi [85], Po [43,77,86,87], At and Au chains [22,88]. 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].…”

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.

124

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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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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.

124

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“…The radioactive atoms diffused out of the target to a thin tube, both heated to approximately 2000 • C to reduce transport time. The resonant ionization laser ion source (RILIS) was used to stepwise resonantly laser ionize the Cu atoms within the ionizer tube [25]. The ions produced were accelerated through 30 kV and mass separated by the high resolution separator (HRS) before they were injected into a radiofrequency quadrupolar (RFQ) linear gas-filled Paul trap (ISCOOL) [26], which was floated at about 100 V below the ion-source acceleration potential.…”

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confidence: 99%

Experimental determination of anIπ=2−ground state inCu72

et al. 2010

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This article reports on the ground-state spin and moments measured in 72,74 Cu using collinear laser spectroscopy at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. From the measured hyperfine coefficients, the nuclear observables µ( 72 Cu) = −1.3472(10)µ N , µ( 74 Cu) = −1.068(3)µ N , Q( 72 Cu) = +8(2) efm 2 , Q( 74 Cu) = +26(3) efm 2 , I ( 72 Cu) = 2, and I ( 74 Cu) = 2 have been determined. Through a comparison of the measured magnetic moments with different models, the negative moment reveals a strong πf 5/2 ⊗ νg 9/2 component in the ground-state wave function. Consequently, a negative parity has been assigned to the ground states of 72,74 Cu. Large-scale shell-model calculations illustrate the strong sensitivity of the nuclear moments to configuration mixing and to the effective interaction employed. The neutron-rich nuclei surrounding the Z = 28 and N = 50 shell closures have received a great deal of experimental and theoretical attention in the last decade. This region presents a key proving ground for the latest shell-model interactions, since it offers an attractively simple structure of the excited states in terms of particle-particle or particle-hole couplings. A compelling question in this region is related to the rapid reduction in energy of the 5/2 − state as the νg 9/2 orbital is filled in the Cu isotopes [1,2]. Given that this state remains static at approximately 1 MeV as neutrons fill the fp shell, its abrupt change at N = 40 garnered a great deal of interest and motivated further experimental and theoretical attention [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A major step in understanding the evolution of nuclear structure in this region was the suggestion to include the monopole term from the tensor force interaction [18,19]. This work predicted a reduction in energy of the 5/2 − state and an inversion with the 3/2 − state in the mid-shell region, which was recently confirmed to occur at N = 46 in the odd-Cu isotopes [20]. Effective shell-model interactions which include this effect have recently been developed in the fpg model space. Two of these interactions start from a 56 Ni core [21,22], while the most recent one also includes excitations of protons from the πf 7/2 orbit across Z = 28 [23]. The odd-odd Cu isotopes are an ideal testing ground for these models, as their properties are extremely sensitive to the proton-neutron interaction.Recent beta-decay studies of 72 Ni [8] have tentatively assigned a spin I = 2 to the ground state (gs) of 72 Cu. Shell-model calculations, based on effective and realistic interactions, could not reproduce such gs spin [8], but placed the 2 − and 2 + states around 400 keV. A gs spin I = 2 is particularly interesting since the spins of 71,73 Cu now have been measured as I = 3/2, and their magnetic moments are compatible with a leading πp 3/2 configuration [20]. However, a [πp 3/2 ⊗ νg 3 9/2 , σ = 1] cannot couple to spin 2, so this configuration cannot be the leading term in the gs wave function of 72 Cu. Alternatively it could be...

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“…This discovery has changed the perception of nuclear systems and questioned established knowledge. Although the first anomaly in the expected order of nuclear orbits was observed in 1960 in 11 Be, 18 it was the measurement of the masses of the exotic sodium isotopes, 31,32 Na performed at CERN PS that revealed that these nuclei were tighter bound than expected.…”

Section: Shell Structure: the Decline Of The Magic Numbersmentioning

confidence: 98%

“…Larger versions of both the radio-frequency quadrupole ion trap and of the Penning trap were developed to deliver cooled and bunched beams to other ISOLDE users like the collinear laser spectroscopy set-up (see Section 5) where it increased the signal-to-background ratio up to four orders of magnitude, and to the REX-ISOLDE post-accelerator (see Section 2.3). Soon after the first laser ionised RIB, beams of long-lived states, called isomeric, were produced and separated using the hyperfine splitting of the atomic transition 11 as it depends on the nuclear properties of the isomer. By changing the laser frequency of the first atomic transition, the specific hyperfine structure of the different nuclear states can be probed.…”

Section: Cooled Beams Isomeric Beams and In-source Laser Spectroscopymentioning

confidence: 99%

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Highlights at ISOLDE

Blaum

Borge

Jonson

et al. 2015

Advanced Series on Directions in High Energy Physics

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The ISOLDE Radioactive Ion Beam Facility at CERN started fifty years ago as an interesting attempt to widen the palette of nuclear species for experimental investigations. During this half century, one has witnessed a continuous development and refinement of the experimental programme. On the road towards today's installation many scientific breakthroughs have been achieved. We present some of them here.

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Isomer separation of Cu and Cu with a resonance ionization laser ion source

Cited by 34 publications

References 12 publications

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

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

Experimental determination of anIπ=2−ground state inCu72

Highlights at ISOLDE

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