Probing the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>32</mml:mn></mml:math>Shell Closure below the Magic Proton Number<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>20</mml:mn></mml:mrow></mml:math>: Mass Measurements of the Exotic Isotopes<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><

Rosenbusch, M.; Ascher, P.; Atanasov, D.; Barbieri, C.; Beck, D.; Blaum, Klaus; Borgmann, Ch.; Breitenfeldt, M.; Cakirli, R. B.; Cipollone, Andrea; George, Sebastian; Herfurth, F.; Kowalska, Magdalena; Kreim, S.; Lunney, D.; Manea, V.; Navrátil, Petr; Neidherr, D.; Schweikhard, L.; Somà, V.; Stanja, J.; Wienholtz, F.; Wolf, R.; Zuber, Κ.

doi:10.1103/physrevlett.114.202501

Cited by 116 publications

(102 citation statements)

References 41 publications

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“…Recent mass measurements up to 54 Ca confirmed that result and 'unambiguously establishes a prominent shell closure at neutron number N=32' [83]. Furthermore, mass measurements up to 53 K confirmed the local 'doubly-magic' nature of 52 Ca [84]. However, in the mean square charge radii of the K isotopes, no clear evidence for a subshell closure at N=32 is observed [54].…”

Section: New Methods and Highlights Since 2000mentioning

confidence: 84%

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: 84%

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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“…[20], may influence their excitation energies and strengths. It has been found recently that the N = 32 subshell closure remains intact below the Ca isotopes [54,55] and theory prognoses a steep increase of 2 + 1 energies in Ne and Mg from N = 28 to N = 32 [20]. Owing to the developments in radioactive isotope beam science, measuring the onset of the expected drop in excitation strength may soon become feasible for magnesium isotopes.…”

Section: Discussionmentioning

confidence: 99%

“…These studies have revealed that far away from the line of β stability traditional closed-shell numbers may vanish, while others can emerge [1]. For example, neutron shell quenching occurs around N = 20 [2][3][4][5] and N = 28 [6,7], while neutron numbers N = 16 and N = 32 and 34 have been found to feature doubly closed-shell signatures for 24 O and 52,54 Ca [8][9][10][11]. It has been shown that the creation and disappearance of magic numbers are mutually connected [12], raising the question of their respective region of validity.…”

Section: Introductionmentioning

confidence: 99%

Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

et al. 2016

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The transition strengths of the first-excited 2 + states and deformation lengths of the nuclei 30 Ne and 36 Mg were determined via Coulomb-and nuclear-force-dominated inelastic scattering at intermediate energies. Beams of these exotic nuclei were produced at the RIKEN Radioactive Isotope Beam Factory and were incident on lead and carbon targets at energies above 200 MeV/u. Absolute excitation cross sections on the lead target yielded reduced transition probabilities of 0.0277(79) and 0.0528(121) e 2 b 2 , while the measurements with the carbon target revealed nuclear deformation lengths of δ N = 1.98(11) and 1.93(11) fm for 30 Ne and 36 Mg, respectively. Corresponding quadrupole deformation parameters of β 2 ∼ 0.5 from the two probes were found comparable in magnitude, showing no indication for a reduction in deformation along isotopic and isotonic chains from 32 Mg towards the neutron drip-line. Comparisons to shell-model calculations illustrate the importance of neutron excitations across the N = 20 shell for 30 Ne and suggest that shallow maximums of collectivity may occur around N = 22 and 24 along the neon and magnesium isotopic chains, respectively.

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“…Indeed, recent developments in accelerator technology and isotope separators have made it possible to explore unreached regions of the Segrè chart, yielding many new, exotic phenomena that cannot be explained in the framework of the standard shell model. Several highlights include the weakening of the traditional magic numbers N = 8 [3][4][5], 20 [6], and 28 [7][8][9], while new magic numbers at N = 16 [10,11], 32 [12][13][14][15][16][17][18][19][20], and 34 [21] have been reported. The next conventional neutron magic number, N = 50, has also attracted much attention recently, and investigations into the robustness of this magic number in neutron-rich systems have been encouraged.…”

Section: Introductionmentioning

confidence: 99%

Investigating nuclear shell structure in the vicinity ofNi78: Low-lying excited states in the neutron-rich isotopesZn80,82<

et al. 2016

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The low-lying level structures of nuclei in the vicinity of 78 Ni were investigated using in-beam γ -ray spectroscopy to clarify the nature of the nuclear magic numbers Z = 28 and N = 50 in systems close to the neutron drip line. Nucleon knockout reactions were employed to populate excited states in 80 were deduced to be 1.32(3) and 1.12 +80 −60 , respectively. These results imply that 80 Zn can be described in terms of two-proton configurations with a 78 Ni core and are consistent with a robust N = 50 magic number along the Zn isotopic chain. These observations, therefore, indicate a persistent N = 50 shell closure in nuclei far from the line of β stability, which in turn suggests a doubly magic structure for 78 Ni.

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Probing theN=32Shell Closure below the Magic Proton NumberZ=20: Mass Measurements of the Exotic Isotopes<

Cited by 116 publications

References 41 publications

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Collinear laser spectroscopy at ISOLDE: new methods and highlights

Mapping the deformation in the “island of inversion”: Inelastic scattering ofNe30andMg36at intermediate energies

Investigating nuclear shell structure in the vicinity ofNi78: Low-lying excited states in the neutron-rich isotopesZn80,82<

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