Configurations and decay hindrances of high- K states in Hf180

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.

doi:10.1103/PhysRevC.94.064304

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

Abstract

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:: Fri Dec 02 00:00:00 EST 2016

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

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

OSTI Identifier:: 1390818

Alternate Identifier(s):: OSTI ID: 1334221

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

Resource 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)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    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., 2016. 
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.  https://doi.org/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. Fri .  
"Configurations and decay hindrances of high- K states in Hf180".  United States.  https://doi.org/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         = {Fri Dec 02 00:00:00 EST 2016},

  month        = {Fri Dec 02 00:00:00 EST 2016}

}

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

Abstract

Citation Formats

Resolution of the isomer 179 anomaly: Exposure of a Fermi-aligned s band journal, July 1991

Study of high-spin states in 181, 182Os journal, May 1995

High- K isomers and rotational structures in W 174 journal, April 2006

High- K isomers in neutron-rich hafnium nuclei at and beyond the stability line journal, March 1999

The generalized centroid shift method for lifetime measurements in heavy ion reactions journal, December 1982

Equilibrium deformations and excitation energies of single-quasiproton band heads of rare-earth nuclei journal, May 1990

Rotational bands and particle-hole excitations at very high spin journal, March 1985

Evaluation of theoretical conversion coefficients using BrIcc journal, May 2008

Multi-quasiparticle states in the mass-180 region journal, August 1995

Search for strongly deformed structures and observation of multiple nucleon alignments in W 174 journal, February 2008

Configurations and hindered decays of K isomers in deformed nuclei with A > 100 journal, May 2015

The Radiations from Hafnium journal, July 1951

Nuclear Ground-State Masses and Deformations journal, March 1995

Nuclear Data Sheets for A = 180 journal, May 2015

Collective Oblate Rotation at High Spins in Neutron-Rich Hf 180 journal, October 2008

Intrinsic states and rotational bands in 176Ta and 178Ta journal, March 1998

Backbending in 180W: a t-band crossing journal, July 1993

K-forbidden transitions from multi-quasiparticle states journal, September 1997

Multi-quasiparticle and rotational structures in 179W: Fermi alignment, the ifK-selection rule and blocking journal, February 1994

CHICO, a heavy ion detector for Gammasphere journal, September 2000

New Physics Opportunities at Gammasphere journal, January 1996

Rotational and intrinsic states above the K π = 25 / 2 − , T 1 / 2 = 25 day isomer in 179 Hf journal, March 2000

The Ame2012 atomic mass evaluation journal, December 2012

Multi-quasiparticle states in 179Ta and structural changes in the yrast line of the odd tantalum isotopes journal, April 1997

Collective rotation and vibration in neutron-rich Hf 180 , 182 nuclei journal, March 2007

The GAMMASPHERE journal, December 1990

Anomalous Isomeric Decays in Lu 174 as a Probe of K Mixing and Interactions in Deformed Nuclei journal, September 2006

Investigation of short-lived isomeric states with half-lives in the μs and ms region journal, October 1964

Decay of high-spin isomers in Os nuclei by barrier penetration journal, August 1988

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

Resolution of the ${}^{179}{isomer}$ anomaly: Exposure of a Fermi-aligned s band
journal, July 1991

Study of high-spin states in 181, 182Os
journal, May 1995

High- K isomers and rotational structures in ${}^{174}W$
journal, April 2006

High- $K$ isomers in neutron-rich hafnium nuclei at and beyond the stability line
journal, March 1999

The generalized centroid shift method for lifetime measurements in heavy ion reactions
journal, December 1982

Equilibrium deformations and excitation energies of single-quasiproton band heads of rare-earth nuclei
journal, May 1990

Rotational bands and particle-hole excitations at very high spin
journal, March 1985

Evaluation of theoretical conversion coefficients using BrIcc
journal, May 2008

Multi-quasiparticle states in the mass-180 region
journal, August 1995

Search for strongly deformed structures and observation of multiple nucleon alignments in ${}^{174}W$
journal, February 2008

Configurations and hindered decays of $K$ isomers in deformed nuclei with $A > 100$
journal, May 2015

The Radiations from Hafnium
journal, July 1951

Nuclear Ground-State Masses and Deformations
journal, March 1995

Nuclear Data Sheets for A = 180
journal, May 2015

Collective Oblate Rotation at High Spins in Neutron-Rich ${}^{180}{Hf}$
journal, October 2008

Intrinsic states and rotational bands in 176Ta and 178Ta
journal, March 1998

Backbending in 180W: a t-band crossing
journal, July 1993

K-forbidden transitions from multi-quasiparticle states
journal, September 1997

Multi-quasiparticle and rotational structures in 179W: Fermi alignment, the ifK-selection rule and blocking
journal, February 1994

CHICO, a heavy ion detector for Gammasphere
journal, September 2000

New Physics Opportunities at Gammasphere
journal, January 1996

Rotational and intrinsic states above the $K^{π} {= 25 / 2}^{-}, T_{1 / 2} = 25$ day isomer in $^{179} Hf$
journal, March 2000

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journal, March 2007

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journal, December 1990

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journal, September 2006

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Decay of high-spin isomers in Os nuclei by barrier penetration
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