Abstract
We discuss, in an investigation based on Vlasov equation, the properties of the isovector modes in nuclear matter and atomic nuclei in relation with the symmetry energy. We obtain numerically the dipole response and determine the strength function for various systems, including a chain of Sn isotopes. We consider for the symmetry energy three parameterizations with density providing similar values at saturation but which manifest very different slopes around this point. In this way we can explore how the slope affects the collective response of finite nuclear systems. We focus first on the dipole polarizability and show that while the model is able to describe the expected mass dependence, A 5/3, it also demonstrates that this quantity is sensitive to the slope parameter of the symmetry energy. Then, by considering the Sn isotopic chain, we investigate the emergence of a collective mode, the Pygmy Dipole Resonance (PDR), when the number of neutrons in excess increases. We show that the total energy-weighted sum rule exhausted by this mode has a linear dependence with the square of isospin I = (N − Z)/A, again sensitive to the slope of the symmetry energy with density. Therefore the polarization effects in the isovector density have to play an important role in the dynamics of PDR. These results provide additional hints in the investigations aiming to extract the properties of symmetry energy below saturation.
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References
J.H. Jeans, Mon. Not. R. Astron. Soc. 76, 71 (1913)
A.A. Vlasov, Zh. Eksp. Teor. Fiz. 8, 291 (1938)
C.K. Birdsall, A.B. Langdon, Plasma Physics via Computer Simulations (Taylor and Francis, 1991)
P. Ring, P. Schuck, The Nuclear Many-Body Problem (Springer, New York, 1980)
M. Di Toro, U. Lombardo, G. Russo, Workshop on Fluid Dynamical Approaches to the Many-Body Problem: Fundamental and Mathematical Aspects, Catania, Italy, 1984, Nuovo Cimento A 87, 174 (1985)
F. Calvayrac, P.-G. Reinhard, E. Suraud, Ann. Phys. 225, 125 (1997)
A. Dellafiore, F. Matera, F.A. Brieva, Phys. Rev. B 61, 2316 (2000)
Th. Fennel et al., Rev. Mod. Phys. 82, 1793 (2010)
G. Manfredi, P.A. Hervieux, Phys. Rev. B 70, 201402 (2004)
N. Crouseilles, P.A. Hervieux, G. Manfredi, Phys. Rev. B 78, 155412 (2008)
D.M. Brink, M. Di Toro, Nucl. Phys. A 372, 151 (1981)
J.E. Moyal, Proc. Cambridge Phil. Soc. 45, 99 (1949)
G. Manfredi, Fields Inst. Commun. 46, 263 (2005)
G.F. Bertsch, Prog. Part. Nucl. Phys. 4, 483 (1980)
P.-G. Reinhard, E. Suraud, Ann. Phys. 239, 193 (1995)
P.-G. Reinhard, E. Suraud, Ann. Phys. 239, 216 (1995)
H. Kohl, P. Schuck, S. Stringari, Nucl. Phys. A 459, 265 (1986)
A. Bonasera, V.N. Kondratyev, A. Smerzi, E.A. Remler, Phy. Rev. Lett. 71, 505 (1993)
A. Dellafiore, F. Matera, D.M. Brink, Phys. Rev. A 51, 914 (1995)
B.K. Jennings, A.D. Jackson, Phys. Rep. 66, 141 (1980)
D.M. Brink, A. Dellafiore, M. Di Toro, Nucl. Phys. A 456, 205 (1986)
A. Dellafiore, F. Matera, Nucl. Phys. A 460, 245 (1986)
F. Burgio, M. Di Toro, Nucl. Phys. A 476, 189 (1988)
V.I. Abrosimov, M. Di Toro, V. Strutinsky, Nucl. Phys. A 562, 41 (1993)
V.I. Abrosimov, A. Dellafiore, F. Matera, Phys. Part. Nucl. 36, 699 (2005)
E.B. Balbutsev, P. Schuck, Ann. Phys. 322, 489 (2007)
M. Urban, Phys. Rev. C 85, 034322 (2012)
M. Di Toro, V.M. Kolomietz, Z. Phys. A 328, 285 (1987)
M. Urban, P. Schuck, Phys. Rev. A 73, 013621 (2006)
V.I. Abrosimov, D.M. Brink, A. Dellafiore, F. Matera, Nucl. Phys. A 800, 1 (2008)
V.I. Abrosimov, D.M. Brink, A. Dellafiore, F. Matera, Nucl. Phys. A 864, 205 (2011)
P. Adrich et al., Phys. Rev. Lett. 95, 132501 (2005)
O. Wieland et al., Phys. Rev. Lett. 102, 092502 (2009)
D.M. Rossi et al., Phys. Rev. Lett. 111, 242503 (2013)
B. Jacquot, A. Guarnera, Ph. Chomaz, M. Colonna, Phys. Rev. C 54, 3025 (1996)
V. Baran, M. Colonna, M. Di Toro, A.B. Larionov, Nucl. Phys. A 632, 287 (1998)
V. Baran, M. Colonna, M. Di Toro, V. Greco, Phys. Rev. Lett. 86, 4492 (2001)
S.S. Avancini, L. Brito, D.P. Menezes, C. Providencia, Phys. Rev. C 71, 044323 (2005)
C. Ducoin, J. Margueron, Ph. Chomaz, Nucl. Phys. A 809, 30 (2008)
G. Fabbri, F. Matera, Phys. Rev. C 58, 1345 (1998)
A.B. Larionov, M. Cabibbo, V. Baran, M. Di Toro, Nucl. Phys. A 648, 157 (1999)
V. Baran, M. Colonna, M. Di Toro, A.B. Larionov, Proceedings of the 6th International Topical Conference on Giant Resonances, Varenna, Italy, 1998, Nucl. Phys. A 649, 185 (1999)
E.A. Uehling, G.E. Uhlenbeck, Phys. Rev. 43, 552 (1933)
G.F. Bertsch, S. Das Gupta, Phys. Rep. 160, 189 (1988)
A. Bonasera, F. Gulminelli, J. Molitoris, Phys. Rep. 243, 1 (1994)
V. Baran, M. Colonna, M. Di Toro, V. Greco, Phys. Rep. 410, 335 (2005)
V. Baran et al., Nucl. Phys. A 679, 373 (2001)
V. Baran, D.M. Brink, M. Colonna, M. Di Toro, Phys. Rev. Lett. 87, 182501 (2001)
V.N. Kondratyev, A. Bonasera, A. Iwamoto, Phys. Rev. C 61, 044613 (2000)
A.B. Larionov, I.N. Mishustin, L.M. Safarov, W. Greiner, Phys. Rev. C 78, 014604 (2008)
S. Plumari et al., Phys. Lett. B 689, 18 (2010)
C. Gregoire et al., Nucl. Phys. A 465, 77 (1987)
P. Schuck et al., Prog. Part. Nucl. Phys. 22, L81 (1989)
A.B. Langdon, C.K. Birdsall, Phys. Fluids 13, 2115 (1970)
D. Idier, B. Benhassine, M. Farine, B. Remaud, F. Sebille, Nucl. Phys. A 564, 204 (1993)
V. Baran, M. Colonna, M. Di Toro, A. Croitoru, D. Dumitru, Phys. Rev. C 88, 044610 (2013)
V. Baran, B. Frecus, M. Colonna, M. Di Toro, Phys. Rev. C 85, 051601 (2012)
V. Baran et al., Rom. J. Phys. 57, 36 (2012)
P.-G. Reinhard, P.D. Stevenson, D. Almehed, J.A. Maruhn, M.R. Strayer, Phys. Rev. E 73, 036709 (2006)
A. Tamii et al., Phys. Rev. Lett. 107, 062502 (2011)
A. Migdal, J. Phys. 8, 331 (1944)
E. Lipparini, S. Stringari, Phys. Lett. B 112, 421 (1982)
V.I. Abrosimov, O.I. Davydovs’ka, Ukr. J. Phys. 54, 1068 (2009)
A. Klimkiewicz et al., Phys. Rev. C 76, 051603 (2007)
T. Aumann, T. Nakamura, Phys. Scr. T 152, 014012 (2013)
D. Savran, T. Aumann, A. Zilges, Prog. Part. Nucl. Phys. 70, 210 (2013)
N. Paar, J. Phys. G 37, 064014 (2010)
N. Paar, T. Niksic, D. Vretenar, P. Ring, Phys. Lett. B 606, 288 (2005)
N. Tsoneva, H. Lenske, Phys. Rev. C 77, 024321 (2008)
D.P. Arteaga, E. Khan, P. Ring, Phys. Rev. C 79, 034311 (2009)
I. Daoutidis, S. Goriely, Phys. Rev. C 86, 034328 (2012)
P. Papakonstantinou, H. Hergert, V.Yu. Ponomarev, R. Roth, Phys. Rev. C 89, 034306 (2014)
N. Paar, D. Vretenar, E. Khan, G. Colo, Rep. Prog. Phys. 70, 691 (2007)
N. Paar, Y.F. Niu, D. Vretenar, J. Meng, Phys. Rev. Lett. 103, 032502 (2009)
N. Tsoneva, H. Lenske, Ch. Stoyanov, Phys. Lett. B 586, 213 (2004)
E. Litvinova, P. Ring, V. Tselyaev, K. Langanke, Phys. Rev. C 79, 054312 (2009)
M.P. Brine, P.D. Stevenson, J.A. Mahrun, P.-G. Reinhard, Int. J. Mod. Phys. E 15, 1417 (2006)
A. Carbone et al., Phys. Rev. C 81, 041301 (2010)
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Baran, V., Colonna, M., Di Toro, M. et al. Nuclear collective dynamics within Vlasov approach. Eur. Phys. J. D 68, 356 (2014). https://doi.org/10.1140/epjd/e2014-50171-x
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DOI: https://doi.org/10.1140/epjd/e2014-50171-x