Low-Lying Structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ar</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>32</mml:mn></mml:mrow></mml:math>Subshell Closure

Steppenbeck, D.; Takeuchi, Satoshi; Aoi, N.; Doornenbal, P.; Matsushita, M.; Wang, Handing; Utsuno, Yutaka; Baba, H.; Go, S.; Lee, J.; Matsui, K.; Michimasa, S.; Motobayashi, T.; Nishimura, D.; Otsuka, Takaharu; Sakuraï, H.; Shiga, Yoshinori; Shimizu, Noritaka; Söderström, P.-A.; Sumikama, T.; Taniuchi, R.; Valiente-Dobón, J. J.; Yoneda, K.

doi:10.1103/physrevlett.114.252501

Cited by 55 publications

(47 citation statements)

References 61 publications

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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%

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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Section: Discussionmentioning

confidence: 99%

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

et al. 2016

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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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“…Along the proton drip line, 31 Ar was found to exhibit the exotic β3p decay mode [29]. For the neutron-rich even-even isotopes, large-scale shell-model calculations reproduced the measured B(E2) in 48 Ar [30] and 50 Ar [31]-indicating an N = 32 subshell closure analogous to those observed in neighboring Ca and Ti isotopes-while overestimating the collectivity in 46 Ar. This is puzzling, as both B(E2) data from Coulomb excitation [32][33][34] and mass measurements [35] point to a robust N = 28 shell closure for Z = 18.…”

Section: Introductionmentioning

confidence: 58%

Doppler-shift attenuation lifetime measurement of the Ar3621+ level

Voss¹,

Drake²,

Starosta³

et al. 2017

Phys. Rev. C

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At TRIUMF, the TIGRESS Integrated Plunger device and its suite of ancillary detector systems have been implemented for charged-particle tagging and light-ion identification in coincidence with γ -ray spectroscopy for Doppler-shift lifetime studies and low-energy Coulomb excitation measurements. As a test of the device, the lifetime of the first 2 + excited state in 36Ar was measured from the γ -ray line shape of the 2transition using the Doppler-shift attenuation technique following Coulomb excitation. The line-shape signatures, vital for precision lifetime measurements, were significantly improved by enhanced reaction-channel selectivity using a complementary approach of kinematic gating and digital rise-time discrimination of recoiling charged particles in a silicon PIN diode array. The lifetime was determined by comparisons between the data and simulated line shapes generated using our TIGRESS Coulomb excitation code as an input to the Lindhard method, which was then extended and included as a class in GEANT4. The model-independent lifetime result of 490 ± 50 fs corresponds to a reduced quadrupole transition strength of B(E2; 2

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Low-Lying Structure ofAr50and theN=32Subshell Closure

Cited by 55 publications

References 61 publications

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

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<

Doppler-shift attenuation lifetime measurement of the Ar3621+ level

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