Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Struktur und Dynamik von Kernen VIII

HK 51.3: Talk

Thursday, March 24, 2011, 14:45–15:00, A-1

Investigation of heavy neutron-rich nuclides with Schottky spectrometry at the ESR — •D. Shubina^1,2, M.W. Reed³, I.J. Cullen³, P.M. Walker³, Yu.A. Litvinov^1,4, K. Blaum¹, F. Bosch⁴, C. Brandau⁴, J.J. Carroll⁵, D.M. Cullen⁶, A.Y. Deo³, B. Detwiller⁵, C. Dimopoulou⁴, F. Farinon⁴, H. Geissel^4,7, E. Haettner⁷, M. Heil⁴, R.S. Kempley³, R. Knöbel⁴, C. Kozhuharov⁴, J. Kurcewicz⁴, N. Kuzminchuk⁴, S.A. Litvinov⁴, Z. Liu⁸, R. Mao⁹, C. Nociforo⁴, F. Nolden⁴, W.R. Plass⁷, A. Prochazka⁴, M.S. Sanjari⁴, C. Scheidenberger^4,7, M. Steck⁴, Th. Stöhlker^2,4, B. Sun⁴, T.P.D. Swan³, G. Trees⁵, H. Weick⁴, N. Winckler¹, M. Winkler⁴, P.J. Woods⁸, and T. Yamaguchi¹⁰ — ¹MPI-K, Heidelberg — ²Uni. Heidelberg — ³Uni. Surrey — ⁴GSI, Darmstadt — ⁵YSU, Youngstown — ⁶Uni. Manchester — ⁷Uni. Gießen — ⁸Uni. Edinburgh — ⁹IMP, Lanzhou — ¹⁰Saitama Uni.

Neutron-rich nuclides produced in fragmentation of ¹⁹⁷Au projectiles were studied in the storage ring ESR. The nuclides were separated in flight with the fragment separator FRS and injected at relativistic energies of 400 MeV/u into the ESR. The properties of cooled ions were investigated with time-resolved Schottky spectrometry, which allowed simultaneous measurement of their masses and lifetimes. In total 54 neutron-rich nuclides (69≤ Z ≤ 79) have been identified. Five long-lived isomeric states were discovered in ^183,184,186Hf and ^186,187Ta [M. Reed et al., PRL105 (2010) 172501]. Masses for five nuclides and half-lives for three nuclides were determined for the first time. The experiment, the data analysis and the obtained results will be presented.