Yrast isomers in exotic N=81 nucleus Yb151 studied using a fragment mass analyzer

D. Nisius, B. Fornal, I. G. Bearden, R. Broda, R. H. Mayer, Z. W. Grabowski, P. J. Daly, C. N. Davids, I. Ahmad, B. B. Back, K. Bindra, M. P. Carpenter, W. Chung, D. Henderson, R. G. Henry, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, Y. Liang, F. Soramel, and A. V. Ramayya
Phys. Rev. C 47, 1929 – Published 1 May 1993
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Abstract

Product recoils from the reaction Ru96 +255 MeV Ni58Hf*154 were analyzed using the Argonne Fragment Mass Analyzer and transported to a collector foil behind the focal plane, where decay of μs isomers could be studied under low background conditions. The recoils were dispersed in A/q as they traversed the position-sensitive focal-plane detector, and recoil–γ-ray coincidences could thus be used to assign masses for specific γ-ray cascades. By use of these methods, yrast isomers with half-lives of 2.6(7) μs and 20(1) μs have been firmly assigned to the exotic N=81 nucleus Yb151, and the main features of the isomeric decays have been established. The yrast level structure of Yb151 and lighter N=81 isotones are compared.

  • Received 4 December 1992

DOI:https://doi.org/10.1103/PhysRevC.47.1929

©1993 American Physical Society

Authors & Affiliations

D. Nisius, B. Fornal, I. G. Bearden, R. Broda, R. H. Mayer, Z. W. Grabowski, and P. J. Daly

  • Purdue University, West Lafayette, Indiana 47907

C. N. Davids, I. Ahmad, B. B. Back, K. Bindra, M. P. Carpenter, W. Chung, D. Henderson, R. G. Henry, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, Y. Liang, and F. Soramel

  • Argonne National Laboratory, Argonne, Illinois 60439

A. V. Ramayya

  • Vanderbilt University, Nashville, Tennessee 37235

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Vol. 47, Iss. 5 — May 1993

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