Isospin Character of Low-Lying Pygmy Dipole States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Pb</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>208</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>via Inelastic Scattering of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mpresc

Crespi, F. C. L.; Bracco, A.; Nicolini, R.; Mengoni, D.; Pellegri, L.; Lanza, E. G.; Leoni, S.; Maj, A.; Kmiecik, M.; Avigo, R.; Benzoni, G.; Blasi, N.; Boiano, C.; Bottoni, S.; Brambilla, S.; Camera, F.; Ceruti, S.; Giaz, A.; Million, B.; Morales, A. I.; Vandone, V.; Wieland, O.; Bednarczyk, P.; Ciemała, M.; Grȩbosz, J.; Krzysiek, M.; Mazurek, K.; Ziębliński, M.; Bazzacco, D.; Bellato, M.; Birkenbach, B.; Bortolato, D.; Calore, Enrico; Cederwall, B.; Charles, L.; Angelis, G. de; Désesquelles, P.; Eberth, J.; Farnea, E.; Gadea, A.; Görgen, A.; Gottardo, A.; Isocrate, R.; Jolie, J.; Jungclaus, A.; Karkour, N.; Körten, W.; Menegazzo, R.; Michelagnoli, C.; Molini, P.; Napoli, D. R.; Pullia, A.; Recchia, F.; Reiter, P.; Rosso, D.; Şahin, E.; Salsac, M. D.; Siebeck, B.; Siem, S.; Simpson, John; Söderström, P.-A.; Stézowski, O.; Theisen, Ch.; Ur, C. A.; Valiente-Dobón, J. J.

doi:10.1103/physrevlett.113.012501

Cited by 64 publications

(29 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8, right panel (a)), the difference between protons and neutrons becomes stronger. We note that the feature described above, namely the splitting of the PDR strength into an isoscalar contribution (at lower energy) and an isovector (more energetic) component has been reported also in recent theoretical and experimental analyses [16,17,18].…”

Section: Transition Densitiessupporting

confidence: 74%

“…In the case of nuclei with some neutron excess, a strong fragmentation of strength has been observed in the isovector dipole response, mainly located at lower energy with respect to the GDR [2,3,4,5,6,7,8,9,10,11]. These low-lying excitations, which are referred in literature as Pygmy Dipole Resonance (PDR), have been the object of intense discussion [12,13,14,15,16,17,18,19,20,21,22,23], proving to be, likewise the GDR, an important probe of crucial information of the nuclear effective interaction, especially concerning its isovector component and the corresponding contribution to the Equation of State (EoS) [24,25,26], namely the symmetry energy.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Symmetry Energy of the Nuclear EoS: A Study of Collective Motion and Low-Energy Reaction Dynamics in Semiclassical Approaches

2019

View full text Add to dashboard Cite

In the framework of mean-field based transport approaches, we discuss recent results concerning collective motion and low-energy heavy ion reactions involving neutron-rich systems. We focus on aspects which are particularly sensitive to the isovector terms of the nuclear effective interaction and the corresponding symmetry energy. As far as collective excitations are concerned, we discuss the mixed nature of dipole oscillations in neutron-rich systems. On the other hand, for reactions close to the Coulomb barrier, we investigate the structure of pre-equilibrium collective dipole oscillations, focusing on their sensitivity to the symmetry energy behavior below normal density. Nucleon emission is also considered within the same context. The possible impact of other relevant terms of the nuclear effective interaction on these mechanisms is also examined. From this analysis we expect to put further constraints on the nuclear Equation of State, of crucial importance also in the astrophysical context.

show abstract

Section: Transition Densitiessupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

The Symmetry Energy of the Nuclear EoS: A Study of Collective Motion and Low-Energy Reaction Dynamics in Semiclassical Approaches

2019

View full text Add to dashboard Cite

show abstract

“…[1][2][3][4] and references therein). Remarkable progress has been made in these years in experimentally studying isospin characters of low-energy dipole excitations for various nuclei, in particular, neutron-rich nuclei [4][5][6][7][8][9]. For stable nuclei, familiar dipole excitations in high-energy region known to be giant dipole resonances (GDRs) have been systematically observed in various nuclei by means of photonuclear reactions and α (or 6 Li) inelastic scatterings, which can probe isovector (IV) and isoscalar (IS) dipole excitations, respectively [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Toroidal, compressive, and E1 properties of low-energy dipole modes in Be10

Kanada-En’yo

Shikata

2017

Phys. Rev. C

View full text Add to dashboard Cite

We studied dipole excitations in 10 Be based on an extended version of the antisymmetrized molecular dynamics, which can describe 1p-1h excitations and large amplitude cluster modes. Toroidal and compressive dipole operators are found to be good proves to separate the low-energy and highenergy parts of the isoscalar dipole excitations, respectively. Two low-energy 1 − states, the toroidal dominant 1 − 1 state at E ∼ 8 MeV and the E1 dominant 1 − 2 state at E ∼ 16 MeV, were obtained. By analysis of transition current densities, the 1 − 1 states is understood as a toroidal dipole mode with exotic toroidal neutron flow caused by rotation of a deformed 6 He cluster, whereas the 1 − 2 state is regarded as a neutron-skin oscillation mode, which are characterized by surface neutron flow with inner isoscalar flow caused by the surface neutron oscillation against the 2α core.

show abstract

“…We may obtain many clues by looking at the dipole spectrum through the lens of different probes, in particular isoscalar probes. Alpha [6] and oxygen [7] scattering have revealed the isoscalar response of 208 Pb represented in the lower panel of Fig. 1 by the energy weighted transition sthrength.…”

Section: Richness Of the Dipole Spectrum -Surveying 208 Pbmentioning

confidence: 98%

Structures in the Nuclear Electric-Dipole Spectrum

Papakonstantinou¹

2017

Exotic Nuclei

View full text Add to dashboard Cite

I undertake an anatomy of the nuclear electric-dipole spectrum and discuss selected observations. First, using data and calculations on 208 Pb as a representative case, I identify five conspicuous structures in the spectra of heavy nuclei: (1) the giant dipole resonance (GDR), (2) the dipole compression mode, (3) the isoscalar low-energy dipole mode (IS-LED), (4) the IS mode in the region of the GDR, and (5) a concentration of "pygmy" dipole strength (PDS) between the latter two. Next, compiling the data from Texas A&M I show that the energy of (4) follows roughly a A -1/6 dependence on the mass number. Finally, I summarize recent theoretical studies on the PDS in exotic nuclei, which suggest a strong influence of shell effects and loose binding.

show abstract

Isospin Character of Low-Lying Pygmy Dipole States inPb208via Inelastic Scattering ofO

Cited by 64 publications

References 32 publications

The Symmetry Energy of the Nuclear EoS: A Study of Collective Motion and Low-Energy Reaction Dynamics in Semiclassical Approaches

The Symmetry Energy of the Nuclear EoS: A Study of Collective Motion and Low-Energy Reaction Dynamics in Semiclassical Approaches

Toroidal, compressive, and E1 properties of low-energy dipole modes in Be10

Structures in the Nuclear Electric-Dipole Spectrum

Contact Info

Product

Resources

About