First observation of γ -soft and triaxial bands in Zr isotopes

doi:10.1103/PhysRevC.100.014319

This content will become publicly available on July 26, 2020

Title: First observation of $γ$ -soft and triaxial bands in Zr isotopes

Abstract

New results obtained in this work from measurements of γ radiation following fission of ²⁴⁸Cm and ²⁵²Cf, performed using Eurogam2 and Gammasphere arrays, respectively, reveal excitations corresponding to γ vibrations and triaxial deformation present in ¹⁰⁰Zr and ¹⁰²Zr nuclei. This is the first observation of nonaxial bands in Zr isotopes. Such excitations probably occur due to competing prolate and oblate configurations, identified recently in these nuclei. Evolution of γ softness and triaxiality in Zr isotopes is observed in the function of the neutron number.

Authors:

Urban, W. ^[1]; Rząca-Urban, T. ^[1]; Wiśniewski, J. ^[1]; Smith, A. G. ^[2]; Simpson, G. S. ^[2]; Ahmad, I. ^[3]

Univ. of Warsaw, Warsaw (Poland)
Univ. of Manchester, Manchester (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States)

Publication Date:: 2019-07-26

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

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

OSTI Identifier:: 1558099

Alternate Identifier(s):: OSTI ID: 1545453

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 100; Journal Issue: 1; 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


                    Urban, W., Rząca-Urban, T., Wiśniewski, J., Smith, A. G., Simpson, G. S., and Ahmad, I. First observation of γ -soft and triaxial bands in Zr isotopes.  United States: N. p., 2019. 
        Web.  doi:10.1103/PhysRevC.100.014319.

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                    Urban, W., Rząca-Urban, T., Wiśniewski, J., Smith, A. G., Simpson, G. S., & Ahmad, I. First observation of γ -soft and triaxial bands in Zr isotopes.  United States.  doi:10.1103/PhysRevC.100.014319.

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                    Urban, W., Rząca-Urban, T., Wiśniewski, J., Smith, A. G., Simpson, G. S., and Ahmad, I. Fri .  
        "First observation of γ -soft and triaxial bands in Zr isotopes".  United States.  doi:10.1103/PhysRevC.100.014319.

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@article{osti_1558099,

  title        = {First observation of γ -soft and triaxial bands in Zr isotopes},

  author       = {Urban, W. and Rząca-Urban, T. and Wiśniewski, J. and Smith, A. G. and Simpson, G. S. and Ahmad, I.},

  abstractNote = {New results obtained in this work from measurements of γ radiation following fission of 248Cm and 252Cf, performed using Eurogam2 and Gammasphere arrays, respectively, reveal excitations corresponding to γ vibrations and triaxial deformation present in 100Zr and 102Zr nuclei. This is the first observation of nonaxial bands in Zr isotopes. Such excitations probably occur due to competing prolate and oblate configurations, identified recently in these nuclei. Evolution of γ softness and triaxiality in Zr isotopes is observed in the function of the neutron number.},

  doi          = {10.1103/PhysRevC.100.014319},

  journal      = {Physical Review C},

  number       = 1,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {7}

}

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DOI: 10.1103/PhysRevC.100.014319

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Similar Records

This content will become publicly available on July 26, 2020

Title: First observation of γ -soft and triaxial bands in Zr isotopes

Abstract

Citation Formats

Harmonic Two-Phonon γ-Vibrational State in Neutron-Rich 106 Mo journal, September 1995

Identification of high spin states in Zr 100 journal, July 2006

Triaxiality and the aligned h 11 ∕ 2 neutron orbitals in neutron-rich Zr and Mo isotopes journal, January 2004

Spins and parities of levels in fission fragments journal, December 1998

Study of spontaneous fission with EUROGAM: Shape transition in A~100 Sr and Zr nuclei journal, February 1997

Shell model description of zirconium isotopes journal, June 2009

Signatures of γ softness or triaxiality in low energy nuclear spectra journal, May 1991

The role of triaxiality in the ground states of even-even neutron-rich Ru isotopes journal, September 1994

Half-life of the 830.2 keV isomer in Sr 97 journal, December 2005

Lifetimes and shape-coexisting states of Zr 99 journal, July 2019

Characterization of the β vibration and 0 + 2 states in deformed nuclei journal, December 2000

Identification of ν 9 / 2 [ 404 ] band in 97 Sr journal, May 2003

A new technique for measuring g factors of excited states in fission fragments using large arrays of Ge detectors journal, March 2002

Nuclear Data Sheets for A = 102 journal, August 2009

“Stiff” deformed nuclei, configuration dependent pairing and the $\beta$ β and $\gamma$ γ degrees of freedom journal, February 2019

Shape evolution of Zr nuclei and roles of the tensor force journal, December 2018

Spin-Dependent Triaxial Deformation in Neutron-Rich Mo Isotopes journal, August 1996

Pairing strength in neutron-rich isotopes of Zr journal, November 1995

Experimental Information Concerning Deformation of Neutron Rich Nuclei in the A ∼ 100 Region journal, July 1970

First observation of the ν9/2[404] orbital in the A ∼ 100 mass region journal, January 2003

Shape coexistence in atomic nuclei journal, November 2011

Nuclear Data Sheets for A = 100 journal, February 2008

Large Arrays of Escape-Suppressed Gamma-Ray Detectors journal, December 1994

Robust Regularity in γ -Soft Nuclei and Its Microscopic Realization journal, March 2012

Gamma rays from fission fragments journal, November 1995

K selection in the decay of the ( ν 5 2 [ 532 ] ⊗ 3 2 [ 411 ] ) 4 − isomeric state in Zr 102 journal, August 2017

Evidence for coexistence of reflection asymmetric and symmetric shapes in 150Sm journal, February 1987

The GAMMASPHERE journal, December 1990

Identification of new collective bands in neutron-rich Zr 102 journal, October 2008

The ν9/2[404] orbital and the deformation in the A ∼ 100 region journal, November 2004

Staggering in γ-band energies and the transition between different structural symmetries in nuclei journal, August 2007

Structure of 0 + excitations in the mass A ≈ 100 region: 0 2 + bands in Sr 98 and Zr 100 journal, June 2019

New excitations in Ba 142 and Ce 144 : Evolution of γ bands in the N = 86 isotones journal, June 2017

Intertwined quantum phase transitions in the Zr isotopes journal, June 2019

Shape coexistence in the odd-odd nucleus Y 98 : The role of the g 9 / 2 neutron extruder journal, October 2017

Title: First observation of $γ$ -soft and triaxial bands in Zr isotopes

Harmonic Two-Phonon γ-Vibrational State in Neutron-Rich $^{106}$ Mo
journal, September 1995

Identification of high spin states in ${}^{100}{Zr}$
journal, July 2006

Triaxiality and the aligned $h_{11 ∕ 2}$ neutron orbitals in neutron-rich Zr and Mo isotopes
journal, January 2004

Spins and parities of levels in fission fragments
journal, December 1998

Study of spontaneous fission with EUROGAM: Shape transition in A~100 Sr and Zr nuclei
journal, February 1997

Shell model description of zirconium isotopes
journal, June 2009

Signatures of γ softness or triaxiality in low energy nuclear spectra
journal, May 1991

The role of triaxiality in the ground states of even-even neutron-rich Ru isotopes
journal, September 1994

Half-life of the 830.2 keV isomer in ${}^{97}{Sr}$
journal, December 2005

Lifetimes and shape-coexisting states of ${}^{99}{Zr}$
journal, July 2019

Characterization of the β vibration and 0 ⁺ ₂ states in deformed nuclei
journal, December 2000

Identification of $ν 9 / 2 [404]$ band in $^{97} Sr$
journal, May 2003

A new technique for measuring g factors of excited states in fission fragments using large arrays of Ge detectors
journal, March 2002

Nuclear Data Sheets for A = 102
journal, August 2009

“Stiff” deformed nuclei, configuration dependent pairing and the $\beta$ β and $\gamma$ γ degrees of freedom
journal, February 2019

Shape evolution of Zr nuclei and roles of the tensor force
journal, December 2018

Spin-Dependent Triaxial Deformation in Neutron-Rich Mo Isotopes
journal, August 1996

Pairing strength in neutron-rich isotopes of Zr
journal, November 1995

Experimental Information Concerning Deformation of Neutron Rich Nuclei in the $A \sim 100$ Region
journal, July 1970

First observation of the ν9/2[404] orbital in the A ∼ 100 mass region
journal, January 2003

Shape coexistence in atomic nuclei
journal, November 2011

Nuclear Data Sheets for A = 100
journal, February 2008

Large Arrays of Escape-Suppressed Gamma-Ray Detectors
journal, December 1994

Robust Regularity in $γ$ -Soft Nuclei and Its Microscopic Realization
journal, March 2012

Gamma rays from fission fragments
journal, November 1995

$K$ selection in the decay of the $(ν \frac{5}{2} [532] \otimes \frac{3}{2} [411]) 4^{-}$ isomeric state in ${}^{102}{Zr}$
journal, August 2017

Evidence for coexistence of reflection asymmetric and symmetric shapes in 150Sm
journal, February 1987

The GAMMASPHERE
journal, December 1990

Identification of new collective bands in neutron-rich ${}^{102}{Zr}$
journal, October 2008

The ν9/2[404] orbital and the deformation in the A ∼ 100 region
journal, November 2004

Staggering in γ-band energies and the transition between different structural symmetries in nuclei
journal, August 2007

Structure of $0^{+}$ excitations in the mass $A \approx 100$ region: $0_{2}^{+}$ bands in ${}^{98}{Sr}$ and ${}^{100}{Zr}$
journal, June 2019

New excitations in ${}^{142}{Ba}$ and ${}^{144}{Ce}$ : Evolution of $γ$ bands in the $N = 86$ isotones
journal, June 2017

Intertwined quantum phase transitions in the Zr isotopes
journal, June 2019

Shape coexistence in the odd-odd nucleus ${}^{98}Y$ : The role of the $g_{9 / 2}$ neutron extruder
journal, October 2017