Abstract.
High-spin states in 108,110Pd isotopes are studied by \(\gamma\)-ray spectroscopy of heavy-ion-induced fission. The Pd isotopes are produced in the fission channel of the 31P + 176Yb reaction at beam energy 152 MeV. The prompt \(\gamma\)-rays are detected with the EUROBALL4 multidetector array. The yrast states of 108,110Pd have been observed above the region of the first backbend. The level scheme of 108Pd was extended with a new negative-parity band. The yrast sequence in 110Pd is observed up to spin I = 14 + and negative-parity bands have also been identified. The backbending in these even-mass Pd isotopes is associated with the alignment of the neutron (h 11/2)2 pair. The negative-parity states arise from two neutron configurations \(\nu h_{11/2} \otimes \nu g_{7/2}\) and \(\nu h_{11/2} \otimes \nu d_{5/2}\) and they are interpreted in the frame of two-quasiparticle + rotor model as semidecoupled bands. The observed experimental staggering in the \(\gamma\)-bands of 108,110Pd supports the theoretical predictions for \(\gamma\)-instability of their shapes.
Similar content being viewed by others
References
P. Möller , At. Data Nucl. Data Tables 26, 165 (1981).
T. Venkova , Eur. Phys. J. A 6, 405 (1999).
Ka-Hae Kim , Nucl. Phys. A 604, 163 (1996).
C. Flaum, D. Cline, Phys. Rev. C 14, 1224 (1976).
A. Hastings , Phys. Rev. C 14, 1946 (1976).
K.R. Pohl , Phys. Rev. C 53, 2682 (1996).
P.H. Regan , Phys. Rev. C 55, 2305 (1997).
Aryaeinejad , Phys. Rev. C 48, 566 (1993).
M. Houry , Eur. Phys. J. A 6, 43 (1999).
R. Krücken , Eur. Phys. J. A 10, 151 (2001).
J. Äystö , Nucl. Phys. A 480, 104 (1988).
J. Simpson, Z. Phys. A 358, 139 (1997).
D.C. Radford, Nucl. Instrum. Methods Phys. Res. A 361, 297 (1995).
I. Deloncle, M.-G. Porquet, M. Dziri-Marcé, Nucl. Instrum. Methods Phys. Res. A 357, 150 (1995).
I. Deloncle, private communication.
T. Kutsarova , The Nucleus: New Physics for the New Millennium, edited by F.D. Smit (Kluwer Academic/Plenum Publishers, New York, 2000) p. 261.
I. Deloncle , Eur. Phys. J. A8, 177 (2000).
L.E. Svensson , Nucl. Phys. A 584, 547 (1995).
J.A. Grau , Phys. Rev. C 14, 2297 (1976).
J.A. Pinston , Nucl. Phys. A 133, 124 (1969).
I.Y. Lee , Phys. Rev. C 25, 1865 (1982).
M. Pignanelli , Nucl. Phys. A 519, 567 (1990).
G. Lhersonneau , Phys. Rev. C 60, 014315 (1999).
M.A.C. Hotchkins , Nucl. Phys. A 530, 111 (1991).
L. Wilets, M. Jean, Phys. Rev. C 102, 788 (1956).
S. Juutinen , Nucl. Phys. A 573, 306 (1994).
R. Bengtsson, S. Frauendorf, Nucl. Phys. A 327, 139 (1979).
T. Kutsarova , Phys. Rev. C 58, 1966 (1998).
J.A. Shannon , Phys. Lett. B 336, 136 (1994).
Z.Q. Zhang , Phys. Rev. C 63, 027302 (2001).
A.S. Davidov, G.F. Filippov, Nucl. Phys. A 8, 237 (1958).
D. Bonatsos, Phys. Lett. B 200, 1 (1988).
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by C. Signorini
Received: 22 April 2003, Revised: 27 June 2003, Published online: 2 December 2003
PACS:
21.60.-n Nuclear structure models and methods - 23.20.Lv \(\gamma\) transitions and level energies - 25.70.Jj Fusion and fusion-fission reactions - 27.60. + j \(90 \leq A \leq 149\)
Rights and permissions
About this article
Cite this article
Lalkovski, S., Minkova, A., Porquet, MG. et al. Two-quasiparticle and collective excitations in transitional 108,110 Pd nuclei. Eur. Phys. J. A 18, 589–596 (2003). https://doi.org/10.1140/epja/i2003-10098-x
Issue Date:
DOI: https://doi.org/10.1140/epja/i2003-10098-x