Evolution of the dipole polarizability in the stable tin isotope chain

Bassauer, S.; Neumann-Cosel, P. von; Reinhard, P.‐G.; Tamii, A.; Adachi, Satoshi; Bertulani, C. A.; Chan, P.; D’Alessio, Antonio; Fujioka, Hiroyuki; Fujita, H.; Fujita, Y.; Gey, G.; Hilcker, M.; Hoang, T.; Inoue, Akihisa; Isaak, J.; Iwamoto, Chihiro; Klaus, T.; Kobayashi, N.; Maeda, Y.; Matsuda, Michiko; Nakatsuka, N.; Noji, S.; Ong, H. J.; Ou, I.; Paar, Nils; Pietralla, N.; Ponomarev, V. Yu.; Reen, Mandeep Singh; Richter, A.; Roca-Maza, X.; Singer, M.; Steinhilber, G.; Sudo, Takashi; Togano, Y.; Tsumura, M.; Watanabe, Yoshiki; Werner, V.

doi:10.1016/j.physletb.2020.135804

Cited by 25 publications

(18 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[70]). One of the main virtues of 132 Sn relative to the lighter open-shell isotopes lies in its simple structure since, as a doubly-magic nucleus, 132 Sn is insensitive to the (presently unclear) role of pairing correlations [22]. A precise measurement of the electric dipole polarizability of 132 Sn is well motivated given the two model independent correlations connecting 132 Sn to 208 Pb identified in Ref.…”

Section: E Electric Dipole Response Of 68 Nimentioning

confidence: 99%

“…Among the electroweak experiments that have been identified as having a strong impact on the EOS of neutron-rich matter (i.e., strong isovector indicators) are parity-violating electron scattering [12][13][14] and photoabsorption reaction [15][16][17][18][19][20][21][22]. For such class of experiments, the connection to the equation of state emerges from a correlation between the slope of the symmetry energy at saturation density (L) and both the neutron skin thickness of 208 Pb (R 208 skin ) [23][24][25][26] and the product of the electric dipole polarizability α D times the value of the nuclear symmetry energy at saturation density J [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Implications of PREX-2 on the electric dipole polarizability of neutron rich nuclei

Piekarewicz

2021

Preprint

View full text Add to dashboard Cite

Background: The recent announcement by the PREX collaboration of an unanticipated thick neutron skin in 208 Pb (R 208 skin ) has challenged our understanding of neutron rich matter in the vicinity of nuclear saturation density. Whereas earlier constraints indicate that the symmetry energy is relatively soft, the PREX-2 result seems to suggest the opposite. Purpose: To confront constraints on the symmetry energy obtained from measurements of the electric dipole polarizability against those informed by the PREX-2 measurement of R 208 skin and by the correlations that it entails. Methods: Covariant energy density functionals informed by the properties of finite nuclei are used to compute the electric dipole response of 48 Ca, 68 Ni, 132 Sn, and 208 Pb. The set of functionals used in this work are consistent with experimental data, yet are flexible enough in that they span a wide range of values of R 208 skin . Results: It is found that theoretical predictions of the electric dipole polarizability that are consistent with the PREX-2 measurement systematically overestimate the corresponding values extracted from the direct measurements of the distribution of electric dipole strength. Conclusions: The neutron skin thickness of 208 Pb extracted from parity violating electron scattering and the electric dipole polarizability measured in photoabsorption experiments are two of the cleanest experimental tools used to constrain the symmetry energy around nuclear saturation density. However, the recent value of R 208 skin that suggests a fairly stiff symmetry energy stands in stark contrast to the conclusions derived from the electric dipole polarizability. At present, we offer no solution to this dilemma.

show abstract

Section: E Electric Dipole Response Of 68 Nimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Implications of PREX-2 on the electric dipole polarizability of neutron rich nuclei

Piekarewicz

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Moreover, the slope k of regression line (in Fig. 1) becomes larger with the increase of neutron number, which makes the constraints on L from this correlation in Table 3: Predictions of the dipole polarizabilities in neutron-rich Sn isotopes from experimental dipole polarizabilities of 208 Pb [30,34] and 124 Sn [36,37] using the correlations shown in Fig. 6 (c neutron-rich nuclei more stiff.…”

Section: α D As a Probe Of Nuclear Isovector Propertiesmentioning

confidence: 99%

“…In recent years, the electric dipole polarizabilities α D in 208 Pb [34], 48 Ca [35], and stable Sn isotopes [33,36,37] were measured with high resolution via polarized proton inelastic scattering at extreme forward angles [38]. For unstable nucleus 68 Ni, α D was also extracted by Coulomb excitation in inverse kinematics [39].…”

Section: Introductionmentioning

confidence: 99%

Electric dipole polarizability in neutron-rich Sn isotopes as a probe of nuclear isovector properties

Li,

Niu,

Long

2021

Preprint

View full text Add to dashboard Cite

The determination of nuclear symmetry energy, and in particular, its density dependence, is a long-standing problem for nuclear physics community. Previous studies have found that the product of electric dipole polarizability α D and symmetry energy at saturation density J has a strong linear correlation with L, the slope parameter of symmetry energy. However, current uncertainty of J hinders the precise constraint on L. We investigate the correlations between electric dipole polarizability α D (or times symmetry energy at saturation density J) in Sn isotopes and the slope parameter of symmetry energy L using the quasiparticle random-phase approximation based on Skyrme Hartree-Fock-Bogoliubov. A strong and model-independent linear correlation between α D and L is found in neutron-rich Sn isotopes where pygmy dipole resonance (PDR) gives a considerable contribution to α D , attributed to the pairing correlations playing important roles through PDR. This newly discovered linear correlation would help one to constrain L and neutron-skin thickness ∆R np stiffly if α D is measured with high resolution in neutron-rich nuclei. Besides, a linear correlation between α D J in a nucleus around β-stability line and α D in a neutron-rich nucleus can be used to assess α D in neutron-rich nuclei.

show abstract

“…Up to now, the PDR in 124 Sn was investigated via α particles (E α = 136 MeV) [13,14], 17 O (E17 O = 340 MeV) [19] and bremsstrahlung (E e − = 7.5, 7.8, 10 MeV) [20,21]. Furthermore, a (p,p') Coulomb excitation experiment, performed at the RCNP in Osaka with E p = 295 MeV, was recently published by Bassauer et al [22,23].…”

Section: Introductionmentioning

confidence: 99%

Low-energy excitations and $$\gamma $$-decay branchings in $$^{124}$$Sn via (p,p’$$\gamma $$) at $$E_p={15}\,\,\hbox {MeV}$$

et al. 2021

View full text Add to dashboard Cite

The dipole response of the proton-magic nucleus $${}^{124}\hbox {Sn}$$ 124 Sn was previously investigated with electromagnetic and hadronic probes. Different responses were observed revealing the so-called isospin splitting of the Pygmy Dipole Resonance (PDR). Here we present the results of a new study of $${}^{124}\hbox {Sn}$$ 124 Sn using inelastic proton scattering at low energies to test an additional probe possibly exciting states of the PDR. The response to the new probe as well as the $$\gamma $$ γ -decay behavior of excited states were studied. The $${}^{124}\hbox {Sn}$$ 124 Sn (p,p’$$\gamma $$ γ ) experiment was performed at $$E_p = {15}\,\,\hbox {MeV}$$ E p = 15 MeV using the combined spectroscopy setup SONIC@HORUS at the Tandem accelerator of the University of Cologne. Proton-$$\gamma $$ γ coincidences were recorded, enabling a state-to-state analysis due to the excellent energy resolution for both particles and $$\gamma $$ γ rays. $$ J=1 $$ J = 1 states in the PDR region were populated in the present inelastic proton scattering experiment. Many $$\gamma $$ γ -decay branching ratios could be determined.

show abstract

Evolution of the dipole polarizability in the stable tin isotope chain

Cited by 25 publications

References 61 publications

Implications of PREX-2 on the electric dipole polarizability of neutron rich nuclei

Implications of PREX-2 on the electric dipole polarizability of neutron rich nuclei

Electric dipole polarizability in neutron-rich Sn isotopes as a probe of nuclear isovector properties

Low-energy excitations and $$\gamma $$-decay branchings in $$^{124}$$Sn via (p,p’$$\gamma $$) at $$E_p={15}\,\,\hbox {MeV}$$

Contact Info

Product

Resources

About