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Prog. Theor. Phys. Supplement No.146 (2002) pp. 493-497

Direct Observation of Bound State Beta Decay of Bare ²⁰⁷Tl at FRS-ESR

T. Ohtsubo,^1,2 F. Bosch,¹ H. Geissel,^1,3 C. Scheidenberger,¹ F. Attallah,¹ K. Beckert,¹ P. Beller,¹ T. Fästermann,⁴ B. Franzke,¹ M. Hausmann,¹ M. Hellstrom,¹ P. Kienle,⁴ O. Klepper,¹ C. Kozhuharov,¹ Yu. Livitnov,¹ L. Maier,⁴ G. Münzenberg,¹ F. Nolden,¹ Yu. Novikov,^1,5 T. Radon,¹ V. Shishkin,¹ J. Stadlmann,¹ M. Steck,¹ T. Stöhlker,¹ K. Sümmer,¹ H. Weick¹ and M. Winkler¹

¹Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
²Department of Physics, Niigata University, Niigata 950-2181, Japan
³II. Physikalisches Institut, Universitaet Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
⁴Physik-Department, Technische Universitaet Muenchen, 85748 Garching, Germany
⁵St. Petersburg Nuclear Physics Institute, Gatchina 188350, Russia

(Received January 28, 2002)

Abstract:

We observed the bound-state beta decay of fully ionized ²⁰⁷Tl nuclei circulating in a storage ring. It is the first direct measurement of bound-state beta decay. ²⁰⁷Tl nuclei were produced by the projectile fragmentation, separated by fragment separator and injected in the storage ring. Using the Schottky diagnostics the decay time spectrum of bare ²⁰⁷Tl and hydrogen like ²⁰⁷Pb ions which are the daughter nuclei of bound-state beta decay were measured. Observed decay-rate ratio between bound-state and continuous-state beta decay was 0.18(2). This value is consistent with the theoretical calculation.

URL : http://ptp.ipap.jp/link?PTPS/146/493/
DOI : 10.1143/PTPS.146.493

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Citing Article(s) :

1. Progress of Theoretical Physics Supplement No.146 (2002) pp. 49-59 :

   Physics with Stored Exotic Nuclei at GSI

   Hans Geissel and Gottfried Münzenberg

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