Configurations and decay hindrances of high- K states in Hf180

doi:10.1103/PhysRevC.94.064304

Title: Configurations and decay hindrances of high- $K$ states in ${}^{180}{Hf}$

Multi-quasiparticle high-K states, several of which are isomeric, were observed in Hf-180 with the Gammasphere array. We determined the lifetimes in the ns-μs range using centroid-shift and decay measurements within a mu s coincidence time window. The configurations of high-K states involve two and four quasiparticles, with states up to K ^π = (18 ^-) established. High-K excitations are found to be progressively more favored with increasing excitation energy. The K quantum number is quite robust up to the highest spins observed, as evidenced by the large values of the reduced hindrance for isomeric decays. Furthermore, rotational bands built on three high-K states are identified, and the measured branching ratios in these sequences enable the assignment of underlying configurations. Multi-quasiparticle calculations using the Lipkin-Nogami approach for pairing, with blocking included, reproduce the observed high-K energies quite well.

Authors:

Tandel, S. K. ^[1] ; Chowdhury, P. ^[2] ; Kondev, F. G. ^[3] ; Janssens, R. V. F. ^[3] ; Khoo, T. L. ^[3] ; Carpenter, M. P. ^[3] ; Lauritsen, T. ^[3] ; Lister, C. J. ^[4] ; Seweryniak, D. ^[3] ; Zhu, S. ^[3] ; Deacon, A. ^[5] ; Freeman, S. J. ^[5] ; Hammond, N. J. ^[3] ; Jones, G. D. ^[6] ; Moore, E. F. ^[3] ; Smith, J. F. ^[5]

Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics; Univ. of Mumbai (India). Centre for Excellence in Basic Sciences (DAE)
Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Manchester (United Kingdom)
Univ. of Liverpool (United Kingdom)

Publication Date:: 2016-12-02

Grant/Contract Number:: AC02-06CH11357; FG02-94ER40848; FG02-94ER40834

Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9985

Publisher:: American Physical Society (APS)

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

Sponsoring Org:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

OSTI Identifier:: 1390818

Alternate Identifier(s):: OSTI ID: 1334221


                    Tandel, S. K., Chowdhury, P., Kondev, F. G., Janssens, R. V.  F., Khoo, T. L., Carpenter, M. P., Lauritsen, T., Lister, C. J., Seweryniak, D., Zhu, S., Deacon, A., Freeman, S. J., Hammond, N. J., Jones, G. D., Moore, E. F., and Smith, J. F.. Configurations and decay hindrances of high- K states in Hf180.  United States: N. p.,  
        Web.  doi:10.1103/PhysRevC.94.064304.

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                    Tandel, S. K., Chowdhury, P., Kondev, F. G., Janssens, R. V.  F., Khoo, T. L., Carpenter, M. P., Lauritsen, T., Lister, C. J., Seweryniak, D., Zhu, S., Deacon, A., Freeman, S. J., Hammond, N. J., Jones, G. D., Moore, E. F., & Smith, J. F.. Configurations and decay hindrances of high- K states in Hf180.  United States.  doi:10.1103/PhysRevC.94.064304.

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                    Tandel, S. K., Chowdhury, P., Kondev, F. G., Janssens, R. V.  F., Khoo, T. L., Carpenter, M. P., Lauritsen, T., Lister, C. J., Seweryniak, D., Zhu, S., Deacon, A., Freeman, S. J., Hammond, N. J., Jones, G. D., Moore, E. F., and Smith, J. F.. 2016.  
        "Configurations and decay hindrances of high- K states in Hf180".  United States.  
        doi:10.1103/PhysRevC.94.064304.  https://www.osti.gov/servlets/purl/1390818.

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@article{osti_1390818,

  title        = {Configurations and decay hindrances of high- K states in Hf180},

  author       = {Tandel, S. K. and Chowdhury, P. and Kondev, F. G. and Janssens, R. V.  F. and Khoo, T. L. and Carpenter, M. P. and Lauritsen, T. and Lister, C. J. and Seweryniak, D. and Zhu, S. and Deacon, A. and Freeman, S. J. and Hammond, N. J. and Jones, G. D. and Moore, E. F. and Smith, J. F.},

  abstractNote = {Multi-quasiparticle high-K states, several of which are isomeric, were observed in Hf-180 with the Gammasphere array. We determined the lifetimes in the ns-μs range using centroid-shift and decay measurements within a mu s coincidence time window. The configurations of high-K states involve two and four quasiparticles, with states up to Kπ = (18-) established. High-K excitations are found to be progressively more favored with increasing excitation energy. The K quantum number is quite robust up to the highest spins observed, as evidenced by the large values of the reduced hindrance for isomeric decays. Furthermore, rotational bands built on three high-K states are identified, and the measured branching ratios in these sequences enable the assignment of underlying configurations. Multi-quasiparticle calculations using the Lipkin-Nogami approach for pairing, with blocking included, reproduce the observed high-K energies quite well.},

  doi          = {10.1103/PhysRevC.94.064304},

  journal      = {Physical Review C},

  number       = 6,

  volume       = 94,

  place        = {United States},

  year         = {2016},

  month        = {12}

}

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Free Publicly Accessible Full Text
Accepted Manuscript (Publisher)
Accepted Manuscript (DOE)
Publisher's Version of Record
10.1103/PhysRevC.94.064304
https://doi.org/10.1103/PhysRevC.94.064304

Works referenced in this record:

Nuclear Ground-State Masses and Deformations
journal, March 1995

Moller, P.; Nix, J. R.; Myers, W. D.
Atomic Data and Nuclear Data Tables, Vol. 59, Issue 2, p. 185-381
DOI: 10.1006/adnd.1995.1002

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Title: Configurations and decay hindrances of high- K states in Hf 180

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resulting from DOE research funding

Title: Configurations and decay hindrances of high- $K$ states in ${}^{180}{Hf}$