Incompressibility of finite fermionic systems: Stable and exotic atomic nuclei

Khan, E.; Paar, Nils; Vretenar, Dario; Cao, Lei; Sagawa, H.; Colò, G.

doi:10.1103/physrevc.87.064311

Cited by 26 publications

(26 citation statements)

References 33 publications

(71 reference statements)

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“…Moreover, an isoscalar monopole mode at lower energy, called soft monopole mode, has been predicted in neutron-rich nuclei by several relativistic and nonrelativistic models [4][5][6]. Recently calculations with an exact treatment of the continuum [7] have also predicted monopole strength in the same energy region.…”

Section: Measurement Of the Isoscalar Giant Resonances (Isgr)mentioning

confidence: 98%

Isoscalar response ofNi68toα-particle and deuteron probes

et al. 2015

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Section: Measurement Of the Isoscalar Giant Resonances (Isgr)mentioning

confidence: 98%

Isoscalar response ofNi68toα-particle and deuteron probes

et al. 2015

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“…On the other side, soft monopole excitations have been much less analyzed in neutron-rich nuclei so far. They were predicted theoretically for neutron-rich Ca [26], Ni [26][27][28], Pb and Sn [29] isotopes. A few attempts to measure them in exotic nuclei have been performed but a clear experimental signature of their existence is still missing.…”

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confidence: 90%

“…[31] for 68 Ni and the authors pointed out the necessity of upgraded active-target setups. On the other side, most of the available theoretical calculations [26,27,29] are based on the mean-field approach. It may then be interesting to have new insights into these excitation modes performing a theoretical investigation that encompasses beyond-mean-field effects and that may, for this reason, provide a clearer and more complete analysis of their nature.…”

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confidence: 99%

Soft breathing modes in neutron-rich nuclei with the subtracted second random-phase approximation

2019

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We analyze the isoscalar response related to breathing modes with particular attention being paid to low-lying excitations in neutron-rich nuclei. We use the subtracted second random-phase approximation (SSRPA) to describe microscopically the response. By increasing the neutron excess, we study the evolution of the response in Ca isotopes going from 40 Ca to 48 Ca and to 60 Ca as well as in N = 20 isotones going from 40 Ca to 36 S and to 34 Si. Finally, the case of 68 Ni is investigated. We predict soft monopole modes in neutron-rich nuclei which are driven by neutron excitations. At variance with dipole pygmy modes, these neutron excitations are not only strongly dominant at the surface of the nucleus but over its entire volume. The effect of the mixing with two particle-two hole configurations induced by the SSRPA model is analyzed. The properties of such soft neutron modes are investigated in terms of their excitation energies, transition densities and wave-function components. Their collectivity is also discussed as a function of the isospin asymmetry and of the mass of the nucleus. The link between such low-energy compression modes and a compressibility modulus introduced for neutron-rich infinite matter is finally studied.

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“…Such measurements in exotic nuclei would significantly improve our understanding of nuclear incompressibility as was the case for nuclear magicity in the past decade. In addition, a soft monopole mode has been predicted around 14 MeV in neutron-rich nuclei by several relativistic and nonrelativistic models [13][14][15], but it has never been observed, due to the difficulty in measuring the monopole response in nuclei far from stability. The soft monopole mode is predicted to be noncollective and its observation could bring valuable information on spin-orbit splitting [16].…”

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confidence: 99%

Publisher’s Note: Measurement of the Isoscalar Monopole Rsponse in the Neutron-Rich NucleusNi68[Phys. Rev. Lett. 113, 032504 (2014)]

Vandebrouck¹,

Gibelin²,

Khan³

et al. 2014

Phys. Rev. Lett.

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The isoscalar monopole response has been measured in the unstable nucleus 68 Ni using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 AE 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 AE 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L ¼ 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L ¼ 0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei.

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Incompressibility of finite fermionic systems: Stable and exotic atomic nuclei

Cited by 26 publications

References 33 publications

Isoscalar response ofNi68toα-particle and deuteron probes

Isoscalar response ofNi68toα-particle and deuteron probes

Soft breathing modes in neutron-rich nuclei with the subtracted second random-phase approximation

Publisher’s Note: Measurement of the Isoscalar Monopole Rsponse in the Neutron-Rich NucleusNi68[Phys. Rev. Lett. 113, 032504 (2014)]

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