Abstract
The direct and statistical neutron decay of the isoscalar giant dipole resonance has been studied in 90Zr, 116Sn, and 208Pb using the (α, α’ n) reaction at a bombarding energy of 200 MeV. The spectra of fast decay neutrons populating valence hole states of the Z, N − 1 nuclei were analyzed, and estimates for the branching ratios were determined. The observation of the nucleon-direct-decay channels helped to select giant-resonance strengths and suppress the underlying background and continuum, which led to an indication of the existence of a new mode with L = 2 character, presumably the overtone of the isoscalar giant quadrupole resonance.
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References
M. N. Harakeh and A. van der Woude, Giant Resonances: Fundamental High-Frequency Modes of Nuclear Excitations (Oxford Univ. Press, New York, 2001), and references therein.
M. N. Harakeh and A. E. L. Dieperink, Phys. Rev. C 23, 2329 (1981).
S. Stringari, Phys. Lett. B 108, 232 (1982).
G. Colò, Phys. Lett. B 485, 362 (2000).
S. Shlomo and A. I. Sanzhur, Phys. Rev. C 65, 044310 (2002).
C. Djalali et al., Nucl. Phys. A 380, 42 (1982).
H. P. Morsch et al., Phys. Rev. Lett. 45, 337 (1980).
H. P. Morsch et al., Phys. Rev. C 28, 1947 (1983).
G. S. Adams et al., Phys. Rev. C 33, 2054 (1986).
B. F. Davis et al., Phys. Rev. Lett. 79, 609 (1997).
H. L. Clark et al., Phys. Rev. C 63, 031301 (2001).
M. Uchida et al., Phys. Lett. B 557, 12 (2003).
Y.-W. Lui et al., Nucl. Phys.A 731, 28c (2004).
D. H. Youngblood et al., Phys. Rev. C 69, 054312 (2004).
D. H. Youngblood et al., Phys. Rev. C 69, 034315 (2004).
M. N. Harakeh et al., Phys. Rev. Lett. 38, 676 (1977).
D. H. Youngblood et al., Phys. Rev. Lett. 39, 1188 (1977).
M. Hunyadi et al., Nucl. Phys. A 731, 49c (2004).
S. Brandenburg et al., Nucl. Phys. A 466, 29 (1987).
M. L. Gorelik et al., Phys. Rev. C 69, 054322 (2004).
M. Hunyadi et al., Phys. Lett. B 576, 253 (2003).
A. M. van den Berg, Nucl. Instrum. Methods Phys. Res. B 99, 637 (1995).
H.J. Wörtche, Nucl. Phys. A 687, 321c (2001).
H. Laurent et al., Nucl. Instrum. Methods Phys. Res. A 326, 517 (1993).
F. Pühlhofer, Nucl. Phys. A 280, 267 (1977).
M. N. Harakeh, Program CASCADE, extended version (1983).
S. Brandenburg et al., Phys. Rev. C 39, 2448 (1989).
W. T. A. Borghols et al., Nucl. Phys. A 504, 231 (1989).
C. A. Witten, Phys. Rev. 188, 1941 (1969).
G. Duhamel-Chrétien et al., Phys. Rev. C 43, 1116 (1991).
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Hunyadi, M., van den Berg, A.M., Davids, B. et al. Direct neutron decay of the isoscalar giant dipole resonance. Phys. Atom. Nuclei 70, 1407–1414 (2007). https://doi.org/10.1134/S1063778807080145
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DOI: https://doi.org/10.1134/S1063778807080145