Abstract
The emission of high-energyγ-rays in the deexcitation of hot40Ca and39K nuclei formed in heavy-ion fusion reactions at excitation energyE x ∼ 90 MeV has been studied. The high energyγ-rays were measured in coincidence with evaporation residues or light charged particles. Theγ spectrum from the self-conjugated compound nucleus40Ca shows an appreciable yield suppression in the Giant Dipole Resonance (GDR) energy region with respect to the39K, due to isospin selection rules in the dipoleγ-decay. The spectral line shapes of theγ spectra are well reproduced by using a statistical code which treats explicitly the isospin quantum number in evaluating level densities and transmission coefficients. The GDR parameters determined from the present coincidence measurements are in good agreement with the systematic in theA ∼ 40 mass region at lower bombarding energy based on the analysis of inclusive spectra.
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References
Snover, K.A.: Ann. Rev. Nucl. Part. Sci.36, 545 (1986) and references therein
Gaardhøje, J.J.: Ann. Rev. Nucl. Part. Sci.42, 483 (1992) and references therein
Harakeh, M.N., Dowell, D.H., Feldmann, G., Garman, E.F., Loveman, R., Osborne, J.L. and Snover, K.A.: Phys. Lett.B176, 297 (1986)
Behr, J.A., Snover, K.A., Gossett, C.A., Kicinska-Habior, M., Gundlach, J.H., Drebi, Z.M., Kaplan, M.S. and Wells, D.P.: Phys. Rev. Lett.70, 3201 (1993); Kicinska-Habior, M., Snover, K.A., Behr, J.A., Gossett, C.A., Gundlach, J.H., Drebi, Z.M., Kaplan, M.S., Wells, D.P.: Nucl. Phys. A569, 17c (1994)
Fornal, B., Gramegna, F., Prete, G., Burch, R., Fabris, D., Ruiz, J.A., Nebbia, G., Viesti, G., Lucarelli, F., Gelli, N.: Nucl. Instrum. Methods A320, 283 (1992)
Fornal, B., Gramegna, F., Prete, G., Burch, R., D'Erasmo, G., Fiore, E.M., Fiore, L., Pantaleo, A., Paticchio, V., Viesti, G., Blasi, P., Cinausero, M., Lucarelli, F., Anghinolfi, M., Corvisiero, P., Taiuti, M., Zucchiatti, A., Bortignon, P.F., Fabris, D., Nebbia, G. and Ruiz, J.A.: Phys. Rev. C44, 2588 (1991)
Formal, B., Gramegna, F., Prete, G., Burch, R., D'Erasmo, G., Fiore, E.M., Fiore, L., Pantaleo, A., Paticchio, V., Viesti, G., Blasi, P., Gelli, N., Lucarelli, F., Anghinolfi, M., Corvisiero, P., Taiuti, M., Zucchiatti, A., Bortignon, P.F., Fabris, D., Nebbia, G., Ruiz, J.A.. Gonin, M. and Natowitz, J.B.: Z. Phys. A340, 59 (1991)
Gelli, N.: Ph. D. Thesis, Università di Firenze (1994), and to be published
Krolas, W., Maj, A., Bednarczyk, P., Fornal, B., Meczynski, W.. Styczen, J., Zieblinski, M.: Z. Phys. A344, 147 (1992)
Pühlhofer, F.: Nucl. Phys. A280, 267 (1977)
Brun, R., Bruyant, F., Maire, M., McPherson, A.C. and Zanarini, P.: GEANT3 Users Guide, Data Handling Division, DD/EE/84-1, CERN (1986)
Grimes, S.M., Anderson, J.D., Kerman, A.K. and Wong, C.: Phys. Rev. C5, 85 (1972)
Dilg, W., Schantl, W., Vonach, H. and Uhl, M.: Nucl. Phys. A217, 269 (1973)
Wilkinson, D.H.: Philos. Mag.1, 379 (1956)
Kuhlmann, E.: Z. Phys. A322, 527 (1985)
Harney, H.L., Richter, A. and Weidenmüller, H.A.: Rev. Mod. Phys.58, 607 (1986)
Snover, K.A.: Nucl. Phys. A553, 153c (1993)
Kicinska-Habior, M., Snover, K.A., Behr, J.A., Feldman, G., Gossett, C.A., Gundlach, J.H.: Phys. Rev. C41, 2075 (1990)
Bracco, A., Gaardhøje, J.J., Bruce, A.M., Garrett, J.D., Herskind, B., Pignanelli, M., Barnéoud, D., Nifenecker, H., Pinston, J.A., Ristori, C., Schussler, F., Bacelar, J. and Hofmann, H.: Phys. Rev. Lett.62, 2080 (1989)
Broglia, R.A. and Ormand, W.E.: Nucl. Phys. A482, 141c (1988);
Broglia, R.A., Bortignon, P.F. and Bracco, A.: Progr. Part. Nucl. Phys.28, 517 (1992)
Bortignon, P.F., Broglia, R.A., Bertsch, G.F., Pacheco, J.: Nucl. Phys. A460, 149 (1986)
De Blasio, F.V., Cassing, W., Tohyama, M., Bortignon, P.F. and Broglia, R.A.: Phys. Rev. Lett.68, 1663 (1992)
Bohr, A., Mottelson, B.R.: Nuclear Structure, Vol. 2. Reading: Benjamin 1975
Bohr, A., Mottelson, B.R.: Nuclear Structure, Vol. 1. Reading: Benjamin 1969
Ormand W.E., Bortignon, P.F., Broglia, R.A., Døssing T., and Lauritzen B.: Nucl. Phys. A519, 61c (1990)
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We thank M. Caldogno for technical support in the development of evaporation residues detectors. We acknowledge the participation of M. Anghinolfi, P. Corvisiero, M. Taiuti and A. Zucchiatti in the early stages of this work. Thanks are due to M. Kicinska-Habior for providing the isospin-dependent code. Discussions with B. Fornal are also gratefully acknowledged.
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Cinausero, M., Gelli, N., Lucarelli, F. et al. Giant dipole resonance inA ∼ 40 hot nuclei from coincidence measurements. Z. Physik A - Hadrons and Nuclei 352, 273–277 (1995). https://doi.org/10.1007/BF01289500
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DOI: https://doi.org/10.1007/BF01289500