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Coulomb excitation of Sn-110 using REX-ISOLDE

A. Ekstrom ; J. Cederkall ; A. Hurst ; C. Fahlander ; A. Banu ; P. Butler ; J. Eberth ; M. Gorska ; D. Habs ; M. Huyse ; O. Kester ; O. Niedermayer ; Thomas Nilsson (Institutionen för fundamental fysik, Subatomär fysik ; Extern) ; M. Pantea ; H. Scheit ; D. Schwalm ; G. Sletten ; D. P. Ushasi ; P. Van Duppen ; N. Warr ; D. Weisshaar
Physica Scripta (0031-8949). Vol. T125 (2006), p. 190-191.
[Konferensbidrag, refereegranskat]

In this paper, we report the preliminary result from the first Coulomb excitation experiment at REX-ISOLDE (Habs et al 1998 Nucl. Instrum. Methods B 139 128) using neutron-deficient Sn-beams. The motivation of the experiment is to deduce the reduced transition probability, B(E2; 2(+) -> 0(+)), for the sequence of neutron deficient, unstable, even-even Sn- isotopes from Sn-110 to ultimately Sn-110. Safe Coulomb excitation using a radioactive beam opens up a new path to study the lifetime of the first excited 2(+) state in these isotopes. The de-excitation path following fusion-evaporation reactions will for the even-even Sn isotopes pass via an isomeric 6(+) state, located at higher energy, which thus hampers measurements of the lifetime of the first excited state using, e. g., recoil-distance methods. For this reason the reduced transition probability of the first excited 2(+) state has remained unknown in this chain of isotopes although the B(E2) value of the stable isotope Sn-112 was measured approximately 30 years ago (see, e. g., Stelson et al 1970 Phys. Rev. C 2 2015). Our experiment is thus the first to accomplish a measurement of this quantity in Sn-110. It is believed that the determination of the B(E2) value in Sn-110 will indicate the turnover point from a trend of increasing B(E2) values for the heavier isotopes to a trend characterized by less collectivity. Our first preliminary result indicates that this assumption may well be correct.

Denna post skapades 2006-09-27. Senast ändrad 2014-09-02.
CPL Pubid: 22566


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Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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