Low-lying collective states in neutron-rich oxygen isotopes via proton scattering

Khan, E.; Blumenfeld, Y.; Giai, Nguyen Van; Suomijärvi, T.; Alamanos, N.; Auger, F.; Colò, G.; Frascaria, N.; Gillibert, A.; Glasmacher, T.; Godwin, M. A.; Kemper, K. W.; Lapoux, V.; Lhenry, I.; Maréchal, F.; Morrissey, D. J.; Musumarra, A.; Orr, N. A.; Ottini-Hustache, S.; Piattelli, P.; Pollacco, E.; Roussel‐Chomaz, P.; Roynette, J.C.; Santonocito, D.; Sauvestre, J. E.; Scarpaci, J. A.; Volpe, Cristina

doi:10.1016/s0370-2693(00)00983-7

Cited by 70 publications

(93 citation statements)

References 26 publications

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“…The calculated B(E2) values differs by a factor of 0.5-1.5 from the quasiparticle RPA calculation in Ref. [31,32]. The adopted model Hamiltonian, especially the Woods-Saxon potential, should be improved to make more quantitative comparison, e.g.…”

Section: Numerical Analysismentioning

confidence: 99%

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Continuum linear response in coordinate space Hartree–Fock–Bogoliubov formalism for collective excitations in drip-line nuclei

2001

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We formulate a continuum linear response theory on the basis of the Hartree-FockBogoliubov formalism in the coordinate space representation in order to describe low-lying and high-lying collective excitations which couple to one-particle and two-particle continuum states. Numerical analysis is done for the neutron drip-line nucleus 24 O. A low-lying collective mode that emerges above the continuum threshold with large neutron strength is analyzed. The collective state is sensitive to the density-dependence of the pairing. The present theory satisfies accurately the energy weighted sum rule. This is guaranteed by treating the pairing selfconsistently both in the static HFB and in the dynamical linear response equation.

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Section: Numerical Analysismentioning

confidence: 99%

“…However, the continuum effect is not precisely accounted in this approach since the single-quasiparticle basis is discretized. Other QRPA models using the discrete BCS quasiparticle basis [31][32][33] have a similar problem.…”

Section: Introductionmentioning

confidence: 99%

Continuum linear response in coordinate space Hartree–Fock–Bogoliubov formalism for collective excitations in drip-line nuclei

2001

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“…Already for not too large deformations, the path diverts substantially from the line of equal proton and neutron deformations, indicating that for both prolate and oblate shapes the neutrons are more deformed than the protons. The Nilsson diagrams of neutron and proton singleparticle energies as obtained with SLy4 for 20 O are shown in Fig. 2 along the path of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…These points, which affect merely the presentation and interpretation of a GCM wave function, but not its physical content, deserve further attention in the future. Anyway, for the multi-dimensional wave function of 20 O the points that can be chosen without having redundant ones in the basis of projected HFB states have to be irregularly distributed indeed. 2 As there is no unambiguous way to plot a two-dimensional wave function for the distribution of basis states we have used here, we will not attempt to do so, but restrict the further discussion to the observables calculated from it.…”

Section: Figmentioning

confidence: 99%

“…In fact, the experimental effort on these isotopes has spurred a number of analysis based either on the mean-field method [13,19,20,21,22,23,24] or on the shell model [18,25,26,27]. Mean-field investigations of collective dynamics properties have up to now exclusively concerned excitations about the lowest configuration which always correspond to zero mass quadrupole moment.…”

Section: Introductionmentioning

confidence: 99%

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Large-amplitudeQn-Qpcollectivity in the neutron-rich oxygen isotope
Severyukhin
¹
,
Bender
²
,
Flocard
³

et al. 2007
Phys. Rev. C
3
0
2
0
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By means of HFB calculations with independent constraints on axial neutron and proton quadrupole momentsQn andQp, we investigate the large amplitude isoscalar and isovector deformation properties of the neutron-rich isotope 20 O. Using the particle-number and angular-momentum projected Generator Coordinate Method, we analyze the collective dynamics in the { Q n , Q p } plane. The parameterization SLy4 of the Skyrme interaction is used for all calculations in connection with a density-dependent zero-range pairing interaction. Our results show that already for this moderately neutron-rich nucleus the transition moments are modified when independent neutron and proton collective dynamics are allowed.

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The N = 16 Spherical Shell Closure in 24O

et al. 2012

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The unbound excited states of the neutron drip-line isotope 24 O have been investigated via the 24 O(p,p ) 23 O+n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of 24 O * was reconstructed from the momenta of 23 O and the neutron. The spinparity of the first excited state, observed at Ex = 4.65 ± 0.14 MeV, was determined to be J π = 2 + from the angular distribution of the cross section. Higher-lying states were also observed. The quadrupole transition parameter β2 of the 2 Otsuka et al. have investigated theoretically the structural evolution of the oxygen isotopes with increasing neutron number (N ) and attributed the development of the shell closure at N = 16 to the strong neutron-proton tensor interaction [10,11].In this Letter we report on the first spectroscopic study of 24 O by proton inelastic scattering. In addition to the excitation energies of the states populated, the wellknown character of proton inelastic scattering also permits the spins-parities, as well as the quadrupole transition parameter (β 2 ) of the first 2 + state to be deduced. As described below, we have been able to provide a firm 2 + assignment for the state at E x = 4.65 ± 0.14 MeV and determine the β 2 , the small value of which is indicative of the spherical closed-shell character of 24 O. A comparison of the E x (2 + 1 ) and β 2 for the chain of oxygen isotopes shows strong evidence for a large shell gap at N = 16.The experiment was performed at the RIPS facility [17] at RIKEN. A schematic view of the downstream section of RIPS and the experimental setup is shown in Fig. 1

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Low-lying collective states in neutron-rich oxygen isotopes via proton scattering

Cited by 70 publications

References 26 publications

Continuum linear response in coordinate space Hartree–Fock–Bogoliubov formalism for collective excitations in drip-line nuclei

Continuum linear response in coordinate space Hartree–Fock–Bogoliubov formalism for collective excitations in drip-line nuclei

Large-amplitudeQn-Qpcollectivity in the neutron-rich oxygen isotope
Severyukhin
¹
,
Bender
²
,
Flocard
³

et al. 2007
Phys. Rev. C
3
0
2
0
View full text Add to dashboard Cite

The N = 16 Spherical Shell Closure in 24O

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Low-lying collective states in neutron-rich oxygen isotopes via proton scattering

Cited by 70 publications

References 26 publications

Continuum linear response in coordinate space Hartree–Fock–Bogoliubov formalism for collective excitations in drip-line nuclei

Continuum linear response in coordinate space Hartree–Fock–Bogoliubov formalism for collective excitations in drip-line nuclei

Large-amplitudeQn-Qpcollectivity in the neutron-rich oxygen isotopeSeveryukhin1, Bender2, Flocard3 et al. 2007Phys. Rev. C3020View full textAdd to dashboardCite

The N = 16 Spherical Shell Closure in 24O

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About

Large-amplitudeQn-Qpcollectivity in the neutron-rich oxygen isotope
Severyukhin
¹
,
Bender
²
,
Flocard
³

et al. 2007
Phys. Rev. C
3
0
2
0
View full text Add to dashboard Cite