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Gamma decay of pygmy states from inelastic scattering of ions

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Abstract.

An overview of relevant results on the study of 1− states focusing on their excitation with nuclear probes is given. Results obtained for the 90Zr , 124Sn , and 208Pb nuclei using the (17O,17O′γ) reaction are compared with available data obtained with the (γ, γ′, and (p, p′) reactions. These comparisons allow to learn on the nature of the populated states, particularly the E1 states, whose isospin character is presently poorly known. The DWBA description of the data is discussed in terms of different form factors, standard collective form factor and form factors obtained by folding microscopically calculated transition densities. The relevant aspects related to the used theoretical approach are also presented. The main objective of the analyses is the extraction of the values of the fraction of the energy weighted sum rule strength for the isoscalar dipole excitation. For completeness, in all cases, the DWBA analysis was made also for the excitations of 2+ and 3− states.

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Authors and Affiliations

  1. Dipartimento di Fisica dell’Università degli Studi di Milano, I-20133, Milano, Italy

    A. Bracco & F. C. L. Crespi

  2. INFN, Sezione di Milano, I-20133, Milano, Italy

    A. Bracco & F. C. L. Crespi

  3. INFN, Sezione di Catania, I-95123, Catania, Italy

    E. G. Lanza

Authors
  1. A. Bracco
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  2. F. C. L. Crespi
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  3. E. G. Lanza
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Correspondence to A. Bracco.

Additional information

Communicated by N. Alamanos

Angela Bracco is a full Professor at the University of Milano and she is associated to INFN. Her research experience is in nuclear structure and she obtained relevant results on the giant dipole resonance at zero and finite temperature. She was involved in the realization of complex detection system for gammaray built in European collaboration (EUROBALL, RISING and AGATA). In 2005–2011 she chaired the Nuclear Physics board of INFN and presently she is the chair of NuPECC (the European expert committee for Nuclear science).

Edoardo G. Lanza is a theoretical nuclear physicist. He is a senior researcher of the Italian Institute for Nuclear Physics (INFN). He graduated at Catania University and received the doctoral degree at the Heidelberg University. He has been awarded a senior Marie Curie Fellowship in 1989. He has been working in heavy-ion physics and in quantum chaos. Recently his main interest has been devoted to collective states in nuclei with neutron excess with a particular attention to the so-called pygmy dipole resonance.

Fabio Crespi received his doctoral degree from the Università degli Studi di Milano in 2008. His research activity focuses on the experimental study via gamma spectroscopy of nuclear properties, in particular collective excitations, at extreme conditions of temperature, angular momentum and isospin. He has been strongly involved in experiments using stable and radioactive beams at several facilities worldwide (e.g., LNLINFN, GANIL, GSI, RIKEN). He had responsabilities in experiments made with the AGATA array, constructed as a large European collaboration. An important part of his activity is devoted to R&D for detectors.

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Bracco, A., Crespi, F.C.L. & Lanza, E.G. Gamma decay of pygmy states from inelastic scattering of ions. Eur. Phys. J. A 51, 99 (2015). https://doi.org/10.1140/epja/i2015-15099-6

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  • DOI: https://doi.org/10.1140/epja/i2015-15099-6

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