Abstract
The quasiparticle representation of the phonon darnping model (PDM) is developed to include the superfluid pairing correlations microscopically. The formalism is applied to calculate the photoabsorption and the electromagnetic (EM) differential cross sections of E1 excitations in neutron-rich oxygen and calcium isotopes. The calculated photoabsorption cross sections agree reasonably well with the available data for 16,18O and 40,48Ca. The results of calculations show that the change of the fraction of the E1 integrated strength in the region of pygmy dipole resonance (PDR) as a function of mass number A with increasing neutron number N is in agreement with the recent experimental data, and does not follow the prediction by the simple cluster model. The EM differential cross sections obtained within PDM in this work show prominent PDR peaks below 15 MeV for 20,22O in agreement with the recent experimental observation. It is also shown that, using low-energy RI beams at around 50–60 MeV/nucleon, one can observe clean and even enhanced PDR peaks without the admixture with the GDR in the EM differential cross sections of neutron-rich nuclei.
Similar content being viewed by others
References
J G Woodworth et al, Phys. Rev. C19, 1667 (1979)
T Aumann et al, GSI Scientific Report 1999, 27 (2000)
N Dinh Dang and A Arima, Phys. Rev. Lett. 80, 4145 (1998); Nucl. Phys. A636, 427 (1998)
N Dihn Dang, K Tanabe and A Arima, Phys. Rev. C58, 3374 (1998); Nucl. Phys. A645, 536 (1999)
N Dinh Dang, K Eisenman, J Seitz and M Theonnessen, Phys. Rev. C61, 027302 (2000)
N Dinh Dang, Nucl. Phys. A687, 253c (2001) N Dinh Dang, A Ansari and A Arima, Angular-momentum effect on the width of hot giant dipole resonance within the phonon damping model, Preprint RIKEN-AF-NF 361 (2000) (10 pages) submitted
T Baumann et al, Nucl. Phys. A635, 428 (1998); A649, 173c (1999)
A Bracco et al, Phys. Rev. Lett. 74, 3748 (1995)
M Matiuzzi et al, Nucl. Phys. A612, 262 (1997)
N Dinh Dang, T Suzuki and A Arima, Description of Gamow-Teller resonance within the phonon damping model, Preprint RIKEN-AF-NF 377 (2000) (11 pages) submitted
N Dinh Dang et al, Nucl. Phys. 621, 719 (1997)
T Wakasa et al, Phys. Rev. C55, 2909 (1997)
K Boretzky, private communication (September, 2000)
N Dinh Dang, K Tanabe and A Arima, Phys. Rev. C59, 3128 (1999)
G Viesti et al, Phys. Rev. C63, 034611 (2001); and these proceedings
A V Ignatyuk, Statistical properties of excited atomic nuclei (Moscow, Energoatomizdat, 1983)
D N Zubarev, Sov. Phys. Usp. 3, 320 (1960)
N N Bogolyubov and S T Tyablikov, Soviet Phys. Dokl. 4, 60 (1959)
W J Llope and P Braun-Muzinger, Phys. Rev. C41, 2644 (1990)
I A Pshenichnov, I N Mishustin, J P Bondorf, A S Botvina and A S Iljinov, Phys. Rev. C60, 044901 (1999)
N Van Giai and H Sagawa, Nucl. Phys. A371, 1 (1981)
A Bohr and B R Mottelson, Nuclear structure (New York, Benjamin, 1969) vol. 1, p. 170
J Ahrens et al,Nucl. Phys. A251, 479 (1975)
G J O’keefe, M N Thompson, Y I Assafiri, R E Pywell and K Shoda, Nucl. Phys. A649, 239 (1987)
H Sagawa and T Suzuki, Phys. Rev. C59, 3116 (1999)
P F Bortigon and R A Broglia, Nucl. Phys. A371, 405 (1981)
S Nishizaki and J Wambach, Phys. Lett. B349, 7 (1995)
S Kamerdzhiev, J Speth and G Tertychny, Nucl. Phys. A624, 328 (1997)
P-G Reinhard, Nucl. Phys. A649, 305c (1999)
Y Alhassid, M Gai and G F Bertsch, Phys. Rev. Lett. 49, 1482 (1982)
T Hartmann, J Enders, P Mohr, K Vogt, S Volz and A Zilges, Phys. Rev. Lett. 85, 274 (2000)
S Mizutori, J Dobaczewski, G A Lalazissis, W Nazarewicz and P-G Reinhard, Phys. Rev. C61, 044326 (2000)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Dang, N.D., Kim Au, V., Suzuki, T. et al. E1 resonances in neutron-rich nuclei within the phonon damping model. Pramana - J Phys 57, 505–518 (2001). https://doi.org/10.1007/s12043-001-0057-1
Issue Date:
DOI: https://doi.org/10.1007/s12043-001-0057-1