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Gibelin, J.; Beaumel, D.; Motobayashi, T.; Aoi, N.; Baba, H.; Blumenfeld, Y.; Dombrádi, Zs.; Elekes, Z.; Fortier, S.; Frascaria, N.; Fukuda, N.; Gomi, T.; Ishikawa, Ken; Kondo, Y.; Kubo, T.; Lima, V. Franco; Nakamura, Takashi; Saito, A.; Satou, Y.; Takeshita, Eri; Takeuchi, Satoshi; Teranishi, Takashi; Togano, Y.; Vinodkumar, A. M.; Yanagisawa, Y.; Yoshida, Kenichi

doi:10.1103/physrevc.75.057306

Cited by 28 publications

(16 citation statements)

References 21 publications

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“…Figure 4 displays the E(2 a smooth, gradual drop in E(2 + 1 ) is observed, in contrast to an increase expected for a good shell closure. While the E2 excitation strength trend is unclear from the measured data points for 26,28 Ne [24,25,47], the present value for 30 Ne establishes an enhanced collectivity. A similar experimental pattern is observed for the chain of magnesium isotopes, which is displayed in Fig.…”

Section: Discussioncontrasting

confidence: 53%

“…the B(E2)↑ values: Inconsistent experimental results were obtained for 26 Ne by Pritychenko et al [24] and Gibelin et al [47], while for 28 Ne the work by Iwasaki et al [25], which agrees with the USDA calculation, supports a persistent N = 20 closed shell. This trend is broken by the present result for 30 Ne, though the predicted B(E2)↑ values for SDPF-M and SDPF-U-MIX are somewhat larger but within the error bars.…”

Section: Discussionmentioning

confidence: 64%

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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: Discussioncontrasting

confidence: 53%

Section: Discussionmentioning

confidence: 64%

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

et al. 2016

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“…Therefore, hindrance of neutron collectivity originating from a closed neutron shell is not significant in these systems. The squares indicate the experimental results from the Coulomb excitation reactions [10,44,45,50,51,[53][54][55]. Solid (open) circles are the deformation lengths estimated from proton inelastic scattering reactions in the present (previous [56]) work.…”

Section: A Proton and Neutron Contributions To The Quadrupole Collecmentioning

confidence: 99%

“…Figure 10 illustrates systematics of quadrupole deformation lengths. The squares indicate results determined from Coulomb excitation experiments [10,44,45,50,51,[53][54][55], where the values for 32 Mg and 34 Mg were weighted averages of the results shown in Fig. 9.…”

Section: B Systematics Of Quadrupole Deformationmentioning

confidence: 99%

Quadrupole collectivity in island-of-inversion nuclei28,30Neand34,36Mg

Michimasa¹,

Yanagisawa²,

Inafuku³

et al. 2014

Phys. Rev. C

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The quadrupole collectivity of neutron-rich even-even neon and magnesium nuclei around N = 20, 28,30 Ne,and 32,34,36 Mg, was studied via proton inelastic scattering on a liquid hydrogen target by in-beam γ -ray spectroscopy in inverse kinematics. The angle-integrated cross sections for the first 2 + states of these nuclei were determined by measuring de-excitation γ rays. The deformation lengths were extracted from the angle-integrated cross sections using distorted-wave calculations. The deformation length of 30 Ne (δ (p,p ) = 1.59 +0.08 −0.09 fm) is smaller than that of 32 Mg (1.83 +0.10 −0.11 fm), which exhibits the largest quadrupole collectivity among the neutron-rich N = 20 isotones. Along the magnesium isotopic chain, the deformation lengths of 34 Mg and 36 Mg were deduced to be 2.30 +0.09 −0.10 fm and 1.90 +0.16 −0.17 fm, respectively. The evolution of quadrupole deformation in the vicinity of 32 Mg is discussed by comparing the present results with the theoretical calculations.

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“…Based on the measured B(E2; 0 + gr → 2 + 1 ) values obtained in the analysis of heavy-ion inelastic scattering experiments [2,3] it is often stated that even-even nuclei next to 27 Ne, 26 Ne and 28 Ne, are deformed. However, I note that the measured E(2 + 1 ) value systematically varies as 2.018, 1.304 and 0.792 MeV in 26 Ne, 28 Ne and 30 Ne, respectively, and the measured energy ratio E(4 + 1 )/E(2 + 1 ) is 2.308 and 2.822 in 28 Ne and 30 Ne, respectively.…”

Section: Introductionmentioning

confidence: 99%

Enhanced E1 transition between weakly-bound excited states in the nucleus Ne27

Hamamoto

2019

Phys. Rev. C

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Inspired by the recently-reported strong electric-dipole (E1) transition between the weaklybound first and second excited states, 3/2 − at 765 keV and 1/2 + at 885 keV, in the nucleus 27 10 Ne 17 , the E1 transition is estimated in a model by properly taking into account the effect of both deformation and weakly-bound neutrons. In addition to both the spin-parities, 1/2 + and 3/2 − , and observed nearly degenerate energies of the two excited states, the observed order of magnitude of the E1 transition strength between the two states is very naturally explained in the case that these two excited states are prolately deformed, in terms of the transitions between the halo components of the wave functions of the weakly-bound odd-neutrons, s 1/2 → p 3/2 and s 1/2 → p 1/2 , in addition to the large probability of the p 3/2 component in the weakly-bound neutron [330 1/2] orbit. The large probability is the result of the shell-structure unique in weakly-bound or resonant neutrons. PACS numbers:

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Measurement of theB(E2,01+→21+)

Cited by 28 publications

References 21 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

Quadrupole collectivity in island-of-inversion nuclei28,30Neand34,36Mg

Enhanced E1 transition between weakly-bound excited states in the nucleus Ne27

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