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Phys. Rev. C 69, 051302(R) (2004) [3 pages]

Proton decay of the highly deformed nucleus 135Tb

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P. J. Woods1, P. Munro1, D. Seweryniak2, C. N. Davids2, T. Davinson1, A. Heinz2,*, H. Mahmud1,†, F. Sarazin1,‡, J. Shergur2,3, W. B. Walters3, and A. Woehr3,§
1Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 USA
3Department of Chemistry, University of Maryland, College Park, Maryland 20742 USA

Received 20 February 2004; published 17 May 2004

The proton decay of the highly deformed nucleus 135Tb has been observed following bombardment of a 92Mo target with a 310 MeV beam of 50Cr ions. This is the first instance of a proton-decaying isotope being produced via the 1p6n fusion-evaporation channel. Evaporation residues were separated in-flight using the Argonne fragment mass analyzer and implanted into a new design double-sided silicon strip detector. 135Tb decays by the emission of a proton with energy Ep=1179(7) keV [Qp=1188(7) keV] and half-life t1∕2=0.94−0.22+0.33ms. The transition is assigned to a highly deformed (β2∼0.3) Jπ=7∕2− configuration by comparing the proton decay rate with calculations for deformed nuclei.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.69.051302
DOI:
10.1103/PhysRevC.69.051302
PACS:
21.10.Tg, 23.50.+z, 27.60.+j, 27.70.+q

*Present Address: Wright Nuclear Structure Laboratory, Yale University, New Haven, CT 06520.

†Present Address: NSLE, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.

‡Present Address: Department of Physics, Colorado School of Mines, Golden CO 80401.

§Present Address: Department of Physics, University of Notre Dame, Notre Dame, IN 46556.

 
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