Sub-barrier Coulomb excitation of Sn-110 and its implications for the Sn-100 shell closure

Summary, in English

The first excited 2(+) state of the unstable isotope Sn-110 has been studied in safe Coulomb excitation at 2.82 MeV/u using the MINIBALL array at the REX-ISOLDE post accelerator at CERN. This is the first measurement of the reduced transition probability of this state using this method for a neutron deficient Sn isotope. The strength of the approach lies in the excellent peak-to-background ratio that is achieved. The extracted reduced transition probability, B(E2 : 0(+) -> 2(+)) 0.220 +/- 0.022e(2) b(2), strengthens the observation of the evolution of the B(E2) values of neutron deficient Sn isotopes that was observed recently in intermediate-energy Coulomb excitation of Sn-108. It implies that the trend of these reduced transition probabilities in the even-even Sn isotopes is not symmetric with respect to the midshell mass number A = 116 as Sn-100 is approached.

• Author: Joakim Cederkäll; Andreas Ekström; Claes Fahlander; A. M. Hurst; M. Hjorth-Jensen; F. Ames; A. Banu; P. A. Butler; T. Davinson; U. Datta Pramanik; J. Eberth; S. Franchoo; G. Georgiev; M. Gorska; D. Habs; M. Huyse; O. Ivanov; J. Iwanicki; O. Kester; U. Koester; B. A. Marsh; O. Niedermaier; T. Nilsson; P. Reiter; H. Scheit; D. Schwalm; T. Sieber; G. Sletten; I. Stefanescu; J. Van de Walle; P. Van Duppen; N. Warr; D. Weisshaar; F. Wenander
• Department/s: Nuclear physics
• Publishing year: 2007
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 98
• Issue: 17
• Links: http://dx.doi.org/10.1103/PhysRevLett.98.172501
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• Research group: Nuclear Structure
• ISBN/ISSN/Other: ISSN: 1079-7114