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

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.

doi:10.5506/APhysPolB.46.695

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

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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:

Carroll, R. J. ^[1]; Page, R. D. ^[2]; Joss, D. T. ^[2]; Uusitalo, J. ^[3]; Darby, I. G. ^[2]; Andgren, K. ^[4]; Cederwall, B. ^[4]; Eeckhaudt, S. ^[3]; Grahn, T. ^[3]; Gray-Jones, C. ^[2]; Greenlees, P. T. ^[3]; Hadinia, B. ^[4]; Jones, P. M. ^[3]; Julin, R. ^[3]; Juutinen, S. ^[3]; Leino, M. ^[3]; Leppänen, A. -P. ^[3]; Nyman, M. ^[3]; O'Donnell, D. ^[5]; Pakarinen, J. ^[3] more »

Univ. of Surrey, Guildford (United Kingdom); Univ. of Liverpool, Liverpool (United Kingdom)
Univ. of Liverpool, Liverpool (United Kingdom)
Univ. of Jyvaskyla, Jyvaskyla (Finland)
Royal Institute of Technology, Stockholm (Sweden)
Univ. of Liverpool, Liverpool (United Kingdom); Daresbury Lab., Warrington (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States)
Daresbury Lab., Warrington (United Kingdom)

Publication Date:: Thu Jan 01 00:00:00 EST 2015

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1222719

Grant/Contract Number:: AC02-06CH11357

Resource Type:: 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.

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                    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.  https://doi.org/10.5506/APhysPolB.46.695

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                    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.  https://doi.org/10.5506/APhysPolB.46.695.  https://www.osti.gov/servlets/purl/1222719.

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@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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