The pygmy quadrupole resonance and neutron-skin modes in 124 Sn

Spieker, M.; Tsoneva, N.; Derya, V.; Endres, J.; Savran, D.; Harakeh, Mohsen; Harissopulos, S.; Herzberg, R.‐D.; Lagoyannis, A.; Lenske, H.; Pietralla, N.; Popescu, L.; Scheck, M.; Schlüter, Felix; Sonnabend, K.; Stoica, Victor; Wörtche, H. J.; Zilges, A.

doi:10.1016/j.physletb.2015.11.004

Cited by 27 publications

(31 citation statements)

References 54 publications

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“…142 Nd, and 144 Sm in the framework of a more advanced microscopic nuclear structure approach based on the self-consistent energy-density functional (EDF) theory and QPM including up to three-phonon configurations [18,19]. The theoretical method has been widely tested in systematic studies of electric and magnetic excitations from different energy and mass regions [4,8,10,12,16,17,65] and also in predictions of new modes of nuclear excitations related to the pygmy quadrupole resonance (PQR) [66][67][68]. A further advantage of the three-phonon EDF+QPM calculations is that we consider explicitly all one-phonon configurations up to the neutron threshold including explicitly the PDR.…”

Section: Results Formentioning

confidence: 99%

Decay of quadrupole-octupole1−states inCa40andCe140
Derya
¹
,
Tsoneva
²
,
Aumann
³

et al. 2016
Phys. Rev. C
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Section: Results Formentioning

confidence: 99%

Decay of quadrupole-octupole1−states inCa40andCe140
Derya
¹
,
Tsoneva
²
,
Aumann
³

et al. 2016
Phys. Rev. C
Self Cite
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0
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“…7). Interestingly, also a pygmy quadrupole resonance has been discovered recently [217,218], revealed by a clustering of J π = 2 + states at excitation energies between ∼ 3 − 5 MeV.…”

Section: The Concept Of Strength Functions Was Introduced By Wigner Dmentioning

confidence: 90%

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Larsen

Spyrou

Liddick

et al. 2019

Progress in Particle and Nuclear Physics

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The rapid-neutron capture process (r process) is identified as the producer of about 50% of elements heavier than iron.This process requires an astrophysical environment with an extremely high neutron flux over a short amount of time (∼ seconds), creating very neutron-rich nuclei that are subsequently transformed to stable nuclei via β − decay. In 2017, one site for the r process was confirmed: the advanced LIGO and advanced Virgo detectors observed two neutron stars merging, and immediate follow-up measurements of the electromagnetic transients demonstrated an "afterglow" over a broad range of frequencies fully consistent with the expected signal of an r process taking place. Although neutronstar mergers are now known to be r-process element factories, contributions from other sites are still possible, and a comprehensive understanding and description of the r process is still lacking. One key ingredient to large-scale r-process reaction networks is radiative neutron-capture (n, γ) rates, for which there exist virtually no data for extremely neutronrich nuclei involved in the r process. Due to the current status of nuclear-reaction theory and our poor understanding of basic nuclear properties such as level densities and average γ-decay strengths, theoretically estimated (n, γ) rates may vary by orders of magnitude and represent a major source of uncertainty in any nuclear-reaction network calculation of rprocess abundances. In this review, we discuss new approaches to provide information on neutron-capture cross sections and reaction rates relevant to the r process. In particular, we focus on indirect, experimental techniques to measure radiative neutron-capture rates. While direct measurements are not available at present, but could possibly be realized in the future, the indirect approaches present a first step towards constraining neutron-capture rates of importance to the r process.

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“…Experimental evidence on the existence of low-energy excitations related to a neutron excess was also reported in Refs. [24,25] for the quadrupole channel.…”

Section: Introductionmentioning

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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The pygmy quadrupole resonance and neutron-skin modes in 124 Sn

Cited by 27 publications

References 54 publications

Decay of quadrupole-octupole1−states inCa40andCe140
Derya
¹
,
Tsoneva
²
,
Aumann
³

et al. 2016
Phys. Rev. C
Self Cite
12
1
2
0
View full text Add to dashboard Cite

Decay of quadrupole-octupole1−states inCa40andCe140
Derya
¹
,
Tsoneva
²
,
Aumann
³

et al. 2016
Phys. Rev. C
Self Cite
12
1
2
0
View full text Add to dashboard Cite

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

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

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The pygmy quadrupole resonance and neutron-skin modes in 124 Sn

Cited by 27 publications

References 54 publications

Decay of quadrupole-octupole1−states inCa40andCe140Derya1, Tsoneva2, Aumann3 et al. 2016Phys. Rev. CSelf Cite12120View full textAdd to dashboardCite

Decay of quadrupole-octupole1−states inCa40andCe140Derya1, Tsoneva2, Aumann3 et al. 2016Phys. Rev. CSelf Cite12120View full textAdd to dashboardCite

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

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

Contact Info

Product

Resources

About

Decay of quadrupole-octupole1−states inCa40andCe140
Derya
¹
,
Tsoneva
²
,
Aumann
³

et al. 2016
Phys. Rev. C
Self Cite
12
1
2
0
View full text Add to dashboard Cite

Decay of quadrupole-octupole1−states inCa40andCe140
Derya
¹
,
Tsoneva
²
,
Aumann
³

et al. 2016
Phys. Rev. C
Self Cite
12
1
2
0
View full text Add to dashboard Cite