HNPS Advances in Nuclear Physics Banner

"Beat" Patterns of Odd-Even Staggering in Octupole Bands of Light Actinides

PDF
Published: Dec 5, 2019
DOI: https://doi.org/10.12681/hnps.2196
Dennis Bonatsos
Institute of Nuclear Physics, N.C.S.R. "Demokritos"
C. Daskaloyannis
Department of Physics, Aristotle University of Thessaloniki
S. B. Drenska
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences
N. Karoussos
Institute of Nuclear Physics, N.C.S.R. "Demokritos"
N. Minkov
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences
P. P. Raychev
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences
R. P. Roussev
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences
Abstract

The Δ I = 1 staggering (odd-even staggering) in octupole bands of light actinides. is found to exhibit a "beat" behaviour as a function of the angular momentum J, forcing us to revise the traditional belief that this staggering decreases gradually to, zero and then remains at this zero value. Various algebraic models (spf-Interacting Boson Model, spdf-IBM, Vector Boson Model, Nuclear Vibron Model) predict in their su(3) limits constant staggering for this case, being thus unable to describe the "beat" behaviour. An explanation of the "beat" behaviour is given in terms of two Dunham expansions (expansions in terms of powers of I ( I + 1) ) with slightly different sets of coefficients for the ground state band and the negative parity band, the difference in the values of the coefficients being attributed to Coriolis couplings to other negative parity bands.

Article Details
  • Section
  • Oral contributions
References
A. Bohr and B. R. Mottelson, Nuclear Structure Vol. II: Nuclear Deformations (World Scientific, Singapore, 1998).
P. Schüler et al.t Phys. Lett. Β 174 (1986) 241.
W. R. Phillips, I. Ahmad, H. Emling, R. Holzmann, R. V. F. Jaassens, T.-L. Khoo and M. W. Drigert, Phys. Rev. Lett. 57 (1986) 3257.
G. A. Leander, R. K. Sheline, P. Möller, P. Olanders, I. Ragnarsson and A. J. Sierk, Nucl. Phys. A 388 (1982) 452.
P. A. Butler and W. Nazarewicz, Rev. Mod. Phys. 68 (1996) 349.
H. J. Daley and F. Iachello, Ann. Phys. (N.Y.) 167 (1986) 73.
B. Buck, A. C. Merchant and S. M. Perez, Phys. Rev. C 57 (1998) R2095.
W. Nazarewicz and P. Olanders, Nucl. Phys. A 441 (1985) 420.
S. Flibotte et al., Phys. Rev. Lett. 71 (1993) 4299; Nucl. Phys. A 584 (1995) 373.
Β. Cederwall et ai, Phys. Rev. Lett. 72 (1994) 3150.
P. J. Twin et al., Phys. Rev. Lett. 57 (1986) 811.
R. V. F. Janssens and T. L. Khoo, Ann. Rev. Nucl. Part. Sci. 41 (1991) 321.
J. Engel and F. Iachello, Phys. Rev. Lett. 54 (1985) 1126.
J. Engel and F. Iachello, Nucl. Phys. A 472 (1987) 61.
A. Georgieva, P. Raychev and R. Roussev, J. Phys. G 8 (1982) 1377; 9 (1983) 521; Bulg. J. Phys. 12 (1985) 147.
D. Bonatsos, C. Daskaloyannis, S. B. Drenska, N. Karoussos, J. Maruani, N. Minkov, P. P. Raychev and R. P. Roussev, in HNPS: Advances in Nuclear Physics (Proceedings of the 10th Hellenic Symposium on Nuclear Physics), ed. P. Demetriou and N. Vodinas (Giahoudi-Giapouli, Thessaloniki, 2000) p. 231.
J. F. C. Cocks et al, Phys. Rev. Lett. 78 (1997) 2920.
N. Schulz et al., Phys. Rev. Lett. 63 (1989) 2645.
A. Artna-Cohen, Nucl. Data Sheets 80 (1997) 157.
Y. A. Akovali, Nucl. Data Sheets 77 (1996) 271.
A. Artna-Cohen, Nucl. Data Sheets 80 (1997) 227.
Y. A. Akovali, Nucl. Data Sheets 77 (1996) 433. "
A. Artna-Cohen, Nucl. Data Sheets 80 (1997) 723.
M. J. A. de Voigt, J. Dudek and Z. Szymanski, Rev. Mod. Phys. 55 (1983) 949.
D. Bonatsos, C. Daskaloyannis, S. B. Drenska, N. Karoussos, N. Minkov, P. P. Raychev, and R. P. Roussev, Phys. Rev. C 62 (2000) 024301.
F. X. Xu, C. S. Wu and J. Y. Zeng, Phys. Rev. C 40 (1989) 2337.
D. Bonatsos, E. N. Argyres, S. B. Drenska, P. P. Raychev, R. P. Roussev and Yu. F. Smirnov, Phys. Lett. Β 251 (1990) 477.
M. A. J. Mariscotti, G. Scharff-Goldhaber and B. Buck, Phys. Rev. 178 (1969) 1864.
P. P. Raychev, R. P. Roussev and Yu. F. Smirnov, J. Phys. G 16 (1990) L137.
J. L. Dunham, Phys. Rev. 41 (1932) 721.
K. Neergârd and P. Vogel, Nucl. Phys. A 145 (1970) 33; 149 (1970) 217.
P. Vogel, Phys. Lett. Β 60 (1976) 431.
S. G. Rohozinski and W. Greiner, Phys. Lett. Β 128 (1983) 1.
F. Iachello and A. Arima, The Interacting Boson Model (Cambridge University Press, Cambridge, 1987).