Structure of 0+ excitations in the mass A≈100 region: 02+ bands in Sr98 and Zr100

Urban, W.; Rząca-Urban, T.; Wiśniewski, J.; Ahmad, I.; Smith, A. G.; Simpson, G. S.

doi:10.1103/PhysRevC.99.064325

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

Abstract

0⁺₂ bands in ⁹⁸Sr and ¹⁰⁰Zr, populated in spontaneous fission of ²⁴⁸Cm and ²⁵²Cf, have been studied using the Eurogam2 and Gammasphere arrays. Phenomenological classification of excited 0⁺ levels in even-even nuclei of the A ≈ 100 region into four categories is presented and an interpretation for each category is proposed. Highly deformed 0⁺₁ ground states and low-energy 0⁺₂ levels in both nuclei are probably due to the 2p-2h excitation of two neutrons from the 9/2⁺[404] extruder to the low-Ω prolate and the 11/2^–[505] oblate orbitals originating from the h_11/2 shell, respectively. As a result, candidates for 0⁺, β vibrational states in A ≈ 100 region are suggested at N > 60.

Authors:

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

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

Publication Date:: 2019-06-21

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

Sponsoring Org.:: Polish National Science Centre (NCN); USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1542589

Alternate Identifier(s):: OSTI ID: 1546254

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 99; 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


                    Urban, W., Rząca-Urban, T., Wiśniewski, J., Ahmad, I., Smith, A. G., and Simpson, G. S. Structure of 0+ excitations in the mass A≈100 region: 02+ bands in Sr98 and Zr100.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevC.99.064325.

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                    Urban, W., Rząca-Urban, T., Wiśniewski, J., Ahmad, I., Smith, A. G., & Simpson, G. S. Structure of 0+ excitations in the mass A≈100 region: 02+ bands in Sr98 and Zr100.  United States.  https://doi.org/10.1103/PhysRevC.99.064325

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                    Urban, W., Rząca-Urban, T., Wiśniewski, J., Ahmad, I., Smith, A. G., and Simpson, G. S. Fri .  
"Structure of 0+ excitations in the mass A≈100 region: 02+ bands in Sr98 and Zr100".  United States.  https://doi.org/10.1103/PhysRevC.99.064325.  https://www.osti.gov/servlets/purl/1542589.

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@article{osti_1542589,

  title        = {Structure of 0+ excitations in the mass A≈100 region: 02+ bands in Sr98 and Zr100},

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

  abstractNote = {0+2 bands in 98Sr and 100Zr, populated in spontaneous fission of 248Cm and 252Cf, have been studied using the Eurogam2 and Gammasphere arrays. Phenomenological classification of excited 0+ levels in even-even nuclei of the A ≈ 100 region into four categories is presented and an interpretation for each category is proposed. Highly deformed 0+1 ground states and low-energy 0+2 levels in both nuclei are probably due to the 2p-2h excitation of two neutrons from the 9/2+[404] extruder to the low-Ω prolate and the 11/2–[505] oblate orbitals originating from the h11/2 shell, respectively. As a result, candidates for 0+, β vibrational states in A ≈ 100 region are suggested at N > 60.},

  doi          = {10.1103/PhysRevC.99.064325},

  journal      = {Physical Review C},

  number       = 6,

  volume       = 99,

  place        = {United States},

  year         = {2019},

  month        = {6}

}

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$β^{-}$ decay study of the ${}^{66}{Mn} − {}^{66}{Fe} − {}^{66}{Co} − {}^{66}{Ni}$ decay chain

Journal Article Stryjczyk, M. ; Tsunoda, Y. ; Darby, I. G. ; ... - Physical Review C

Here, shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around ⁶⁸Ni represent an excellent study case, however, spectroscopic information of the neutron-rich, Z < 28 nuclei is limited. The goal is to measure γ-ray transitions in ⁶⁶Fe, ⁶⁶Co, and ⁶⁶Ni populated in the β– decay of ⁶⁶Mn to determine absolute β feedings and relative γ-decay probabilities and to compare the results with Monte Carlo shell model calculations in order to study the influence of the relevant single neutron and proton orbital occupancies around Z = 28 and N =more »« less
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https://doi.org/10.1103/PhysRevC.98.064326
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https://doi.org/10.1103/physrevc.104.064304

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Title: Structure of 0 + excitations in the mass A ≈ 100 region: 0 2 + bands in Sr 98 and Zr 100

Abstract

Citation Formats

Lifetime of the 331.3 keV 0 2 + state in100Zr journal, September 1978

New insights from studies of spontaneous fission with large detector arrays journal, January 1995

Shape coexistence and evolution in Sr 98 journal, January 2016

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

Spectroscopic Quadrupole Moments in Sr 96 , 98 : Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N = 60 journal, January 2016

Congruent band structures in 154Gd : Configuration-dependent pairing, a double vacuum and lack of $ \beta$ -vibrations journal, January 2011

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

Gamma-gamma angular correlation measurements of transitions in98Sr and98Zr and confirmation of shape coexistence in98Sr journal, June 1984

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

A shell-model interpretation of intruder states and the onset of deformation in even-even nuclei journal, June 1985

Hartree-Fock-Bogolyubov study of deformation in the ZrMo region journal, July 1978

Microscopic aspects of nuclear deformation journal, October 1994

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

New Features of Shape Coexistence in Sm 152 journal, August 2009

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

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

Investigations of short half-life states from SF of 252Cf journal, July 2005

Shape coexistence and level structure of Zr 100 from decay of the low-spin isomer of Y 100 journal, February 1986

Deformation and shape coexistence of 0+ states in 98Sr and 100Zr journal, October 1989

Two-quasiparticle bands in neutron-rich nuclei journal, April 2003

The?-decay of100Y: Discovery of a very low lying 0+ state in100Zr journal, March 1977

The strongly deformed nucleus 100Sr journal, September 1979

Rotational bands in the mass 100 region journal, July 1991

Quadrupole phonons in the cadmium isotopes journal, September 2018

0 2 + band in Ru 102 and the evolution of nuclear deformation in Ru isotopes journal, March 2013

Triple shape coexistence and shape evolution in the N = 58 Sr and Zr isotopes journal, March 2012

Lifetime measurements and nuclear deformation in the A ≈ 100 region journal, July 2012

Confirmation of the 331 keV O+-state in100Zr journal, March 1978

Shell structure for deformed nuclear shapes journal, September 1972

New cold and ultra hot binary and cold ternary spontaneous fission modes for 252Cf and new band structures with gammasphere journal, January 1997

Experimental indication of the onset of nuclear deformation in neutron-rich Sr isotopes at mass 98 journal, November 1977

Shape coexistence in atomic nuclei journal, November 2011

Nuclear Data Sheets for A = 110 journal, May 2012

Nuclear Data Sheets for A = 100 journal, February 2008

Gamma rays from fission fragments journal, November 1995

The GAMMASPHERE journal, December 1990

Unified shell-model description of nuclear deformation journal, August 1979

Nuclear Data Sheets for A = 98 journal, February 2003

Equilibrium shapes and high-spin properties of the neutron-rich A ≈ 100 nuclei journal, May 1997

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

Evolution of deformation in the neutron-rich Zr region from excited intruder state to the ground state journal, March 1994

Microscopic study of the shape transition in the zirconium isotopes journal, March 1979

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

Coexistence and B(E2)'s in 98Sr journal, January 2017

Shape coexistence and their configuration mixing in 98 Sr and 100 Zr journal, September 2003

Triple angular correlations of γ rays following spontaneous fission journal, November 1995

A K = 3 two-quasiparticle isomer in 98 Sr journal, January 2002

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

Proton–neutron structure of the N=52 nucleus 92Zr journal, December 2002

Evidence for Coexisting Shapes through Lifetime Measurements in Zr 98 journal, November 2018

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

Low-Energy Coexisting Band in G d 154 journal, September 2003

Abrupt shape transition at neutron number N = 60 : B ( E 2 ) values in Sr 94 , 96 , 98 from fast γ − γ timing journal, May 2017

Medium-spin structure of 96,97Sr and 98,99Zr nuclei and the onset of deformation in the region journal, July 2001

The 11 / 2 − [ 505 ] neutron extruder orbital in Sm 159 journal, September 2009

Nuclear structure of Cd 112 studied through the Cd 111 ( d ⃗ , p ) reaction journal, October 2018

Low-spin excitations in Zr 97 journal, December 2018

Deformation in odd-mass nuclei near A ∼ 100: one- and three-quasiparticle nilsson states in 9939Y60 journal, June 1985

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

Observation of a full set of coexisting intruder excitations in 98Zr: Evidence for correlated excitations? journal, September 1986

Shape coexistence and low-lying collective states in A ≈ 100 Zr nuclei journal, June 1993

Nuclear structure of Sr, Zr, and Mo isotopes journal, December 1985

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

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

Towards a unified microscopic description of nuclear deformation journal, January 1977

Search for octupole deformation in neutron-rich Cs nuclei journal, April 1995

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

Coexistence in even-mass nuclei journal, June 1992

Discovery of a very low-lying 0+ state in 98Sr and shape coexistence implication in 98Sr journal, May 1980

Two-Quasiparticle Bands and Isomers in 98 Sr journal, October 2004

Identification of a pairing isomeric band in Sm 152 journal, April 2005

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

Nuclear Data Sheets for A = 110 journal, March 2000

Nuclear Data Sheets for A = 100 journal, May 1997

Equilibrium shapes and high-spin properties of the neutron-rich A~100 nuclei text, January 1997

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

Lifetime of the 331.3 keV 0 2 + state in100Zr
journal, September 1978

New insights from studies of spontaneous fission with large detector arrays
journal, January 1995

Shape coexistence and evolution in ${}^{98}{Sr}$
journal, January 2016

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

Spectroscopic Quadrupole Moments in ${}^{96, 98}{Sr}$ : Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at $N = 60$
journal, January 2016

Congruent band structures in 154Gd : Configuration-dependent pairing, a double vacuum and lack of $ \beta$ -vibrations
journal, January 2011

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

Gamma-gamma angular correlation measurements of transitions in98Sr and98Zr and confirmation of shape coexistence in98Sr
journal, June 1984

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

A shell-model interpretation of intruder states and the onset of deformation in even-even nuclei
journal, June 1985

Hartree-Fock-Bogolyubov study of deformation in the ZrMo region
journal, July 1978

Microscopic aspects of nuclear deformation
journal, October 1994

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

New Features of Shape Coexistence in ${}^{152}{Sm}$
journal, August 2009

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

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

Investigations of short half-life states from SF of 252Cf
journal, July 2005

Shape coexistence and level structure of ${}^{100}{Zr}$ from decay of the low-spin isomer of ${}^{100}Y$
journal, February 1986

Deformation and shape coexistence of 0+ states in 98Sr and 100Zr
journal, October 1989

Two-quasiparticle bands in neutron-rich nuclei
journal, April 2003

The?-decay of100Y: Discovery of a very low lying 0+ state in100Zr
journal, March 1977

The strongly deformed nucleus 100Sr
journal, September 1979

Rotational bands in the mass 100 region
journal, July 1991

Quadrupole phonons in the cadmium isotopes
journal, September 2018

$0_{2}^{+}$ band in ${}^{102}{Ru}$ and the evolution of nuclear deformation in Ru isotopes
journal, March 2013

Triple shape coexistence and shape evolution in the $N = 58$ Sr and Zr isotopes
journal, March 2012

Lifetime measurements and nuclear deformation in the $A \approx 100$ region
journal, July 2012

Confirmation of the 331 keV O+-state in100Zr
journal, March 1978

Shell structure for deformed nuclear shapes
journal, September 1972

New cold and ultra hot binary and cold ternary spontaneous fission modes for 252Cf and new band structures with gammasphere
journal, January 1997

Experimental indication of the onset of nuclear deformation in neutron-rich Sr isotopes at mass 98
journal, November 1977

Shape coexistence in atomic nuclei
journal, November 2011

Nuclear Data Sheets for A = 110
journal, May 2012

Nuclear Data Sheets for A = 100
journal, February 2008

Gamma rays from fission fragments
journal, November 1995

The GAMMASPHERE
journal, December 1990

Unified shell-model description of nuclear deformation
journal, August 1979

Nuclear Data Sheets for A = 98
journal, February 2003

Equilibrium shapes and high-spin properties of the neutron-rich A ≈ 100 nuclei
journal, May 1997

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

Evolution of deformation in the neutron-rich Zr region from excited intruder state to the ground state
journal, March 1994

Microscopic study of the shape transition in the zirconium isotopes
journal, March 1979

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

Coexistence and B(E2)'s in 98Sr
journal, January 2017

Shape coexistence and their configuration mixing in $^{98} Sr$ and $^{100} Zr$
journal, September 2003

Triple angular correlations of γ rays following spontaneous fission
journal, November 1995

A $K = 3$ two-quasiparticle isomer in $^{98} Sr$
journal, January 2002

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

Proton–neutron structure of the N=52 nucleus 92Zr
journal, December 2002

Evidence for Coexisting Shapes through Lifetime Measurements in ${}^{98}{Zr}$
journal, November 2018

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

Low-Energy Coexisting Band in ${}^{154}{G d}$
journal, September 2003

Abrupt shape transition at neutron number $N = 60$ : $B (E 2)$ values in ${}^{94, 96, 98}{Sr}$ from fast $γ - γ$ timing
journal, May 2017

Medium-spin structure of 96,97Sr and 98,99Zr nuclei and the onset of deformation in the region
journal, July 2001

The $11 / 2^{-} [505]$ neutron extruder orbital in ${}^{159}{Sm}$
journal, September 2009

Nuclear structure of ${}^{112}{Cd}$ studied through the ${}^{111}{Cd} (\vec{d}, p)$ reaction
journal, October 2018

Low-spin excitations in ${}^{97}{Zr}$
journal, December 2018

Deformation in odd-mass nuclei near A ∼ 100: one- and three-quasiparticle nilsson states in 9939Y60
journal, June 1985

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

Observation of a full set of coexisting intruder excitations in 98Zr: Evidence for correlated excitations?
journal, September 1986

Shape coexistence and low-lying collective states in A ≈ 100 Zr nuclei
journal, June 1993

Nuclear structure of Sr, Zr, and Mo isotopes
journal, December 1985

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

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

Towards a unified microscopic description of nuclear deformation
journal, January 1977

Search for octupole deformation in neutron-rich Cs nuclei
journal, April 1995

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

Coexistence in even-mass nuclei
journal, June 1992

Discovery of a very low-lying 0+ state in 98Sr and shape coexistence implication in 98Sr
journal, May 1980

Two-Quasiparticle Bands and Isomers in ⁹⁸ Sr
journal, October 2004

Identification of a pairing isomeric band in ${}^{152}{Sm}$
journal, April 2005

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

Nuclear Data Sheets for A = 110
journal, March 2000

Nuclear Data Sheets for A = 100
journal, May 1997

Equilibrium shapes and high-spin properties of the neutron-rich A~100 nuclei
text, January 1997