Deformed nuclear halos

Misu, T.; Nazarewicz, W.; Åberg, Sven

doi:10.1016/s0375-9474(96)00458-7

Cited by 93 publications

(109 citation statements)

References 46 publications

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“…After each (ℓσ) component propagates over a certain region of r, ψ nπm (r) will be dominated by thē ϕ (n) ℓσm (r) component of the lowest possible ℓ (i.e. ℓ = |m| ± 1/2, with the sign fixed by the parity) due to the centrifugal barrier [14,15], although the degree of the dominance depends on characters of the deformed orbit. The asymptotic form ofR (n) ℓσm (r) at large r is e −ηnπmr /r with η nπm = 2M|ε nπm | (ε nπm is the s.p.…”

Section: Neck Structure Of Neutron Halo In 40 Mgmentioning

confidence: 99%

Application of Gaussian expansion method to nuclear mean-field calculations with deformation

Nakada

2008

Nuclear Physics A

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We extensively develop a method of implementing mean-field calculations for deformed nuclei, using the Gaussian expansion method (GEM). This GEM algorithm has the following advantages: (i) it can efficiently describe the energy-dependent asymptotics of the wave functions at large r, (ii) it is applicable to various effective interactions including those with finite ranges, and (iii) the basis parameters are insensitive to nuclide, thereby many nuclei in wide mass range can be handled by a single set of bases. Superposing the spherical GEM bases with feasible truncation for the orbital angular momentum of the single-particle bases, we obtain deformed single-particle wave-functions to reasonable precision. We apply the new algorithm to the Hartree-Fock and the Hartree-Fock-Bogolyubov calculations of Mg nuclei with the Gogny interaction, by which neck structure of a deformed neutron halo is suggested for 40 Mg.

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Section: Neck Structure Of Neutron Halo In 40 Mgmentioning

confidence: 99%

Application of Gaussian expansion method to nuclear mean-field calculations with deformation

Nakada

2008

Nuclear Physics A

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“…For example, the smallest possible angular momentum component of π = 1/2 + orbits is s 1/2 , which always becomes the overwhelming component of angular momentum in neutron one-particle wave functions with π = 1/2 + as the binding energy of the neutron approaches 0 [1,8]. In the case where the smallest orbital angular momentum is not equal to 0, it depends on the properties of the respective orbits how the component of the smallest orbital angular momentum becomes dominant in one-particle wave functions when the binding energy approaches 0 [1].…”

Section: Introductionmentioning

confidence: 99%

Neutron shell structure and deformation in neutron-drip-line nuclei

Hamamoto

2012

Phys. Rev. C

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Neutron shell-structure and the resulting possible deformation in the neighborhood of neutrondrip-line nuclei are systematically discussed, based on both bound and resonant neutron oneparticle energies obtained from spherical and deformed Woods-Saxon potentials. Due to the unique behavior of weakly-bound and resonant neutron one-particle levels with smaller orbital angularmomenta ℓ, a systematic change of the shell structure and thereby the change of neutron magicnumbers are pointed out, compared with those of stable nuclei expected from the conventional j-j shell-model. For spherical shape with the operator of the spin-orbit potential conventionally used, the ℓ j levels belonging to a given oscillator major shell with parallel spin-and orbital-angularmomenta tend to gather together in the energetically lower half of the major shell, while those levels with anti-parallel spin-and orbital-angular-momenta gather in the upper half. The tendency leads to a unique shell structure and possible deformation when neutrons start to occupy the orbits in the lower half of the major shell. Among others, the neutron magic-number N=28 disappears and N=50 may disappear, while the magic number N=82 may presumably survive due to the large ℓ = 5 spin-orbit splitting for the 1h 11/2 orbit. On the other hand, an appreciable amount of energy gap may appear at N=16 and 40 for spherical shape, while neutron-drip-line nuclei in the region of neutron number above N=20, 40 and 82, namely N ≈ 21-28, N ≈ 41-54, and N ≈ 83-90, may be quadrupole-deformed though the possible deformation depends also on the proton number of respective nuclei.

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“…Specifically, when spherical symmetry is broken, the number of single-particle levels with low-l components increases. Furthermore, the amplitudes of the low-l components in single-particle wave functions are expected to increase with weaker neutron binding [18,19].…”

mentioning

confidence: 99%

“…The latter corresponds to a 3p-2h configuration, a dominant one in the SM(ii) calculation that predicts a similar β value. It is noted that the p-wave component becomes relatively more significant than the fwave component as S n approaches zero [18,19]. Recent calculations using the particle-rotor model [37] and the antisymmetrized molecular dynamics approach [38] also propose that 31 Ne is strongly deformed with J π ¼ 3=2 − .…”

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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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Deformed nuclear halos

Cited by 93 publications

References 46 publications

Application of Gaussian expansion method to nuclear mean-field calculations with deformation

Application of Gaussian expansion method to nuclear mean-field calculations with deformation

Neutron shell structure and deformation in neutron-drip-line nuclei

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

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