The first excited state of 30Ne studied by proton inelastic scattering in reversed kinematics

Yanagisawa, Y.; Notani, M.; Sakuraï, H.; Kunibu, M.; Akiyoshi, H.; Aoi, N.; Baba, H.; Demichi, K.; Fukuda, N.; Hasegawa, H.; Higurashi, Y.; Ishihara, M.; Iwasa, N.; Iwasaki, H.; Gomi, T.; Kanno, S.; Kurokawa, M.; Matsuyama, Y. U.; Michimasa, S.; Minemura, T.; Mizoi, Y.; Nakamura, Takashi; Saito, A.; Serata, M.; Shimoura, S.; Sugimoto, Takashi; Takeshita, Eri; Takeuchi, Satoshi; Ue, K.; Yamada, K.; Yoneda, K.; Motobayashi, T.

doi:10.1016/s0370-2693(03)00802-5

Cited by 151 publications

(65 citation statements)

References 36 publications

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“…This can also explain the observed increase in the mean square charge radius toward 28 Ne. For 30 Ne the first excited state was found at about 800 keV [50], lower than for any other Ne isotope, which strengthens all other evidence that N = 20 is not magic for Z = 10.…”

Section: Even-even Neon Isotopessupporting

confidence: 80%

Charge radii of neon isotopes across thesdneutron shell

et al. 2011

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We report on the changes in mean square charge radii of unstable neon nuclei relative to the stable 20 Ne, based on the measurement of optical isotope shifts. The studies were carried out using collinear laser spectroscopy on a fast beam of neutral neon atoms. High sensitivity on short-lived isotopes was achieved thanks to nonoptical detection based on optical pumping and state-selective collisional ionization, which was complemented by an accurate determination of the beam kinetic energy. The new results provide information on the structural changes in the sequence of neon isotopes all across the neutron sd shell, ranging from the proton drip line nucleus and halo candidate 17 Ne up to the neutron-rich 28 Ne in the vicinity of the "island of inversion." Within this range the charge radius is smallest for 24 Ne with N = 14 corresponding to the closure of the neutron d 5/2 shell, while it increases toward both neutron shell closures, N = 8 and N = 20. The general trend of the charge radii correlates well with the deformation effects which are known to be large for several neon isotopes. In the neutron-deficient isotopes, structural changes arise from the onset of proton-halo formation for 17 Ne, shell closure in 18 Ne, and clustering effects in 20,21 Ne. On the neutron-rich side the transition to the island of inversion plays an important role, with the radii in the upper part of the sd shell confirming the weakening of the N = 20 magic number. The results add new information to the radii systematics of light nuclei where data are scarce because of the small contribution of nuclear-size effects to the isotope shifts which are dominated by the finite-mass effect.

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Section: Even-even Neon Isotopessupporting

confidence: 80%

Charge radii of neon isotopes across thesdneutron shell

et al. 2011

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“…Later, more direct experimental evidence of the strong deformation was found for 32 Mg from the low excitation energy of the 2 1 + state [3,4] and the large B͑E2;0 1 + → 2 1 + ͒ [5] value. Thus, the disappearance of the N = 20 magic structure has been established in some N =20 isotones including the recent case for 30 Ne [6]. It still remains, however, an open question as to where the ground state changes from a normal-to an intruder-dominant configuration in the chain of isotopes, and the question as to what mechanism drives this disappearance remains.…”

Section: Introductionmentioning

confidence: 99%

Onset of intruder ground state in exoticNaisotopes and evolution of theN=20shell gap

et al. 2004

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The onset of intruder ground states in Na isotopes is investigated by comparing experimental data and shell-model calculations. This onset is one of the consequences of the disappearance of the N = 20 magic structure, and the Na isotopes are shown to play a special role in clarifying the change of this magic structure. Both the electromagnetic moments and the energy levels clearly indicate an onset of ground state intruder configurations at neutron number N = 19 already, which arises only with a narrow N = 20 shell gap in Na isotopes resulting from the spin-isospin dependence of the nucleon-nucleon interaction (as compared to a wider gap in stable nuclei like 40 Ca). It is shown why the previous report based on the mass led to a wrong conclusion.

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“…The energy loss in the target is taken into consideration. A peak near 800 keV, corresponding to the 2 þ 1 → 0 þ 1 (ground-state) transition [27][28][29], is clearly observed for both C and Pb targets. 30 Ne for the 1n-removal of 31 Ne on (a) C, and (b) Pb targets.…”

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confidence: 99%

“…With the energy of this transition fixed at 791 keV [27], the spectra are fitted with the detector response to this transition, obtained by a GEANT4 simulation, plus an exponentially falling background. The cross sections obtained from this transition are shown in the second row of Table I. The partial cross sections for direct feeding of 30 1 Þ partial cross section on the C target, σ −1n ðC; 0 þ 1 Þ ¼ 33ð15Þ mb, and its Coulomb breakup cross section on the Pb target, σ −1n ðE1; 0 þ 1 Þ ¼ 448ð108Þ mb, can now be compared with the calculated single-particle cross sections σ SP ðC; nljÞ and σ SP ðE1; nljÞ, computed for a unit C 2 S. We construct the required neutron single-particle wave functions as eigenstates of Woods-Saxon potentials with geometry parameters (r 0 , a 0 ¼ 0.7 fm) and a fixed spin-orbit potential of strength V SO ¼ 6.0 MeV.…”

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confidence: 99%

Deformation-Drivenp-Wave Halos at the Drip Line:Ne31

Nakamura¹,

Kobayashi²,

Kondo³

et al. 2014

Phys. Rev. Lett.

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The halo structure of 31 Ne is studied using 1n-removal reactions on C and Pb targets at 230 MeV=nucleon. A combined analysis of the cross sections of these nuclear and Coulomb dominated reactions that feed directly the 30 Ne ground-state reveals 31 Ne to have a small neutron separation energy, 0.15 þ0.16 −0.10 MeV, and spin-parity 3=2 − . Consistency of the data with reaction and large-scale shell-model calculations identifies 31 Ne as deformed and having a significant p-wave halo component, suggesting that halos are more frequent occurrences at the neutron drip line.

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The first excited state of 30Ne studied by proton inelastic scattering in reversed kinematics

Cited by 151 publications

References 36 publications

Charge radii of neon isotopes across thesdneutron shell

Charge radii of neon isotopes across thesdneutron shell

Onset of intruder ground state in exoticNaisotopes and evolution of theN=20shell gap

Deformation-Drivenp-Wave Halos at the Drip Line:Ne31

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