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Title: Competing decay modes of a high-spin isomer in the proton-unbound nucleus ¹⁵⁸Ta*

Abstract

An isomeric state at high spin and excitation energy was recently observed in the proton-unbound nucleus 158Ta. This state was observed to decay by both α and γ decay modes. The large spin change required to decay via γ-ray emission incurs a lifetime long enough for α decay to compete. The α decay has an energy of 8644(11) keV, which is among the highest observed in the region, a partial half-life of 440(70) μs and changes the spin by 11ℏ. In this study, additional evidence supporting the assignment of this α decay to the high-spin isomer in 158Ta will be presented.

Authors:
 [1];  [2];  [2];  [3];  [2];  [4];  [4];  [3];  [3];  [2];  [3];  [4];  [3];  [3];  [3];  [3];  [3];  [3];  [5];  [3] more »;  [3];  [3];  [3];  [3];  [6];  [7] « less
  1. Univ. of Surrey, Guildford (United Kingdom); Univ. of Liverpool, Liverpool (United Kingdom)
  2. Univ. of Liverpool, Liverpool (United Kingdom)
  3. Univ. of Jyvaskyla, Jyvaskyla (Finland)
  4. Royal Institute of Technology, Stockholm (Sweden)
  5. Univ. of Liverpool, Liverpool (United Kingdom); Daresbury Lab., Warrington (United Kingdom)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Daresbury Lab., Warrington (United Kingdom)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1222719
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Acta Physica Polonica. Series B
Additional Journal Information:
Journal Volume: 46; Journal Issue: 3; Journal ID: ISSN 0587-4254
Publisher:
Jagiellonian University
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Carroll, R. J., Page, R. D., Joss, D. T., Uusitalo, J., Darby, I. G., Andgren, K., Cederwall, B., Eeckhaudt, S., Grahn, T., Gray-Jones, C., Greenlees, P. T., Hadinia, B., Jones, P. M., Julin, R., Juutinen, S., Leino, M., Leppänen, A. -P., Nyman, M., O'Donnell, D., Pakarinen, J., Rahkila, P., Sandzelius, M., Sarén, J., Scholey, C., Seweryniak, D., and Simpson, J.. Competing decay modes of a high-spin isomer in the proton-unbound nucleus ¹⁵⁸Ta*. United States: N. p., 2015. Web. doi:10.5506/APhysPolB.46.695.
Carroll, R. J., Page, R. D., Joss, D. T., Uusitalo, J., Darby, I. G., Andgren, K., Cederwall, B., Eeckhaudt, S., Grahn, T., Gray-Jones, C., Greenlees, P. T., Hadinia, B., Jones, P. M., Julin, R., Juutinen, S., Leino, M., Leppänen, A. -P., Nyman, M., O'Donnell, D., Pakarinen, J., Rahkila, P., Sandzelius, M., Sarén, J., Scholey, C., Seweryniak, D., & Simpson, J.. Competing decay modes of a high-spin isomer in the proton-unbound nucleus ¹⁵⁸Ta*. United States. doi:10.5506/APhysPolB.46.695.
Carroll, R. J., Page, R. D., Joss, D. T., Uusitalo, J., Darby, I. G., Andgren, K., Cederwall, B., Eeckhaudt, S., Grahn, T., Gray-Jones, C., Greenlees, P. T., Hadinia, B., Jones, P. M., Julin, R., Juutinen, S., Leino, M., Leppänen, A. -P., Nyman, M., O'Donnell, D., Pakarinen, J., Rahkila, P., Sandzelius, M., Sarén, J., Scholey, C., Seweryniak, D., and Simpson, J.. Thu . "Competing decay modes of a high-spin isomer in the proton-unbound nucleus ¹⁵⁸Ta*". United States. doi:10.5506/APhysPolB.46.695. https://www.osti.gov/servlets/purl/1222719.
@article{osti_1222719,
title = {Competing decay modes of a high-spin isomer in the proton-unbound nucleus ¹⁵⁸Ta*},
author = {Carroll, R. J. and Page, R. D. and Joss, D. T. and Uusitalo, J. and Darby, I. G. and Andgren, K. and Cederwall, B. and Eeckhaudt, S. and Grahn, T. and Gray-Jones, C. and Greenlees, P. T. and Hadinia, B. and Jones, P. M. and Julin, R. and Juutinen, S. and Leino, M. and Leppänen, A. -P. and Nyman, M. and O'Donnell, D. and Pakarinen, J. and Rahkila, P. and Sandzelius, M. and Sarén, J. and Scholey, C. and Seweryniak, D. and Simpson, J.},
abstractNote = {An isomeric state at high spin and excitation energy was recently observed in the proton-unbound nucleus 158Ta. This state was observed to decay by both α and γ decay modes. The large spin change required to decay via γ-ray emission incurs a lifetime long enough for α decay to compete. The α decay has an energy of 8644(11) keV, which is among the highest observed in the region, a partial half-life of 440(70) μs and changes the spin by 11ℏ. In this study, additional evidence supporting the assignment of this α decay to the high-spin isomer in 158Ta will be presented.},
doi = {10.5506/APhysPolB.46.695},
journal = {Acta Physica Polonica. Series B},
number = 3,
volume = 46,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}

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