Fission fragment isomers populated via $^{6}\mathrm{Li}+^{232}\mathrm{Th}$

Fission fragment isomers populated via ${}^{6}{Li} + {}^{232}{Th}$

J. J. Ressler, J. A. Caggiano, C. J. Francy, P. N. Peplowski, J. M. Allmond, C. W. Beausang, L. A. Bernstein, D. L. Bleuel, J. T. Harke, P. Fallon, A. A. Hecht, D. V. Jordan, S. R. Lesher, M. A. McMahan, T. S. Palmer, L. Phair, N. D. Scielzo, P. G. Swearingen, G. A. Warren, and M. Wiedeking

Phys. Rev. C 81, 014301 – Published 6 January 2010

Abstract

Short-lived isomers in fission fragments following bombardment of 45-MeV ${}^{6}{Li}$ on ${}^{232}{Th}$ were examined. Isomers in the $A ~ 95, 122,$ and 132 mass regions were observed. New isomeric decays were observed in ${}^{121}{In}$ [ $T_{1 / 2} = 17 (2) μ$ s], ${}^{123}{In}$ ( $T_{1 / 2} ≳ 100 μ$ s), and ${}^{125}{Sb}$ [ $T_{1 / 2} = 25 (4) μ$ s]. These isomers are suggested to arise from $ν (h_{11 / 2} \otimes d_{3 / 2}) 7^{-}$ and $ν (h_{11 / 2} \otimes s_{1 / 2}) 5^{-}$ neutron core excitations coupling with the valence proton.

Received 28 September 2009

DOI:https://doi.org/10.1103/PhysRevC.81.014301

Authors & Affiliations

J. J. Ressler¹, J. A. Caggiano¹, C. J. Francy^1,2, P. N. Peplowski¹, J. M. Allmond³, C. W. Beausang³, L. A. Bernstein⁴, D. L. Bleuel⁴, J. T. Harke⁴, P. Fallon⁵, A. A. Hecht⁶, D. V. Jordan¹, S. R. Lesher^4,*, M. A. McMahan^5,†, T. S. Palmer², L. Phair⁵, N. D. Scielzo⁴, P. G. Swearingen^1,2, G. A. Warren¹, and M. Wiedeking⁴

¹Pacific Northwest National Laboratory, Richland, Washington 99352, USA
²Department of Nuclear Engineering, Oregon State University, Corvallis, Oregon 97331, USA
³Department of Physics, University of Richmond, Richmond, Virginia 23173, USA
⁴Lawrence Livermore National Laboratory, Livermore, California 94551, USA
⁵Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁶Department of Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA

^*Current address: Department of Physics, University of Wisconsin, LaCrosse, Wisconsin 54601, USA.
^†Current address: South Dakota Science and Technology Authority, Sanford Underground Science and Engineering Laboratory at Homestake, Lead, South Dakota 57754, USA.

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Vol. 81, Iss. 1 — January 2010

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Physical Review C

covering nuclear physics

Fission fragment isomers populated via ${}^{6}{Li} + {}^{232}{Th}$

J. J. Ressler, J. A. Caggiano, C. J. Francy, P. N. Peplowski, J. M. Allmond, C. W. Beausang, L. A. Bernstein, D. L. Bleuel, J. T. Harke, P. Fallon, A. A. Hecht, D. V. Jordan, S. R. Lesher, M. A. McMahan, T. S. Palmer, L. Phair, N. D. Scielzo, P. G. Swearingen, G. A. Warren, and M. Wiedeking

Phys. Rev. C 81, 014301 – Published 6 January 2010

Abstract

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Physical Review C

covering nuclear physics

Fission fragment isomers populated via Li6+Th232

J. J. Ressler, J. A. Caggiano, C. J. Francy, P. N. Peplowski, J. M. Allmond, C. W. Beausang, L. A. Bernstein, D. L. Bleuel, J. T. Harke, P. Fallon, A. A. Hecht, D. V. Jordan, S. R. Lesher, M. A. McMahan, T. S. Palmer, L. Phair, N. D. Scielzo, P. G. Swearingen, G. A. Warren, and M. Wiedeking

Phys. Rev. C 81, 014301 – Published 6 January 2010

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Fission fragment isomers populated via ${}^{6}{Li} + {}^{232}{Th}$