Multitude of 2+ discrete states in Sn 124 observed via the (O 17, O ′ 17 γ) reaction : Evidence for pygmy quadrupole states

Academic Article

Publication Date:

2015

Citation:

Multitude of 2+ discrete states in Sn 124 observed via the (O 17, O ′ 17 γ) reaction : Evidence for pygmy quadrupole states / L. Pellegri, A. Bracco, N. Tsoneva, R. Avigo, G. Benzoni, N. Blasi, S. Bottoni, F. Camera, S. Ceruti, F.C.L. Crespi, A. Giaz, S. Leoni, H. Lenske, B. Million, A.I. Morales, R. Nicolini, O. Wieland, D. Bazzacco, P. Bednarczyk, B. Birkenbach, M. Ciemała, G. De Angelis, E. Farnea, A. Gadea, A. Görgen, A. Gottardo, J. Grebosz, R. Isocrate, M. Kmiecik, M. Krzysiek, S. Lunardi, A. Maj, K. Mazurek, D. Mengoni, C. Michelagnoli, D.R. Napoli, F. Recchia, B. Siebeck, S. Siem, C. Ur, J.J. Valiente-Dobón. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 92:1(2015 Jul 31), pp. 014330.1-014330.7.

abstract:

A multitude of discrete 2+ states in Sn124 with energy up to 5 MeV were populated and identified with the (O17, O′17γ) reaction at 340 MeV. Cross sections were compared with distorted wave Born approximation predictions and in general a good agreement was found. The measured energy and intensity distributions of the 2+ states are very similar to the predictions based on self-consistent density functional theory and extended QRPA approach accounting for multiphonon degrees of freedom. This provides evidence of the excitation of the pygmy quadrupole resonance in skin nuclei.

IRIS type:

01 - Articolo su periodico

Keywords:

Nuclear and High Energy Physics

List of contributors: