New low-energy 0+ state and shape coexistence in Ni70

Prokop, C. J.; Crider, B. P.; Liddick, S. N.; Ayangeakaa, A. D.; Carpenter, M. P.; Carroll, J. J.; Chen, J.; Chiara, C. J.; David, H. M.; Dombos, A. C.; Go, S.; Harker, J.; Janssens, R. V.  F.; Larson, N.; Lauritsen, T.; Lewis, R.; Quinn, S. J.; Recchia, F.; Seweryniak, D.; Spyrou, A.; Suchyta, S.; Walters, W. B.; Zhu, S.

doi:10.1103/PhysRevC.92.061302

Title: New low-energy $0^{+}$ state and shape coexistence in ${}^{70}{Ni}$

Abstract

We report that in recent models, the neutron-rich Ni isotopes around N=40 are predicted to exhibit multiple low-energy excited 0⁺ states attributed to neutron and proton excitations across both the N=40 and Z=28 shell gaps. In ⁶⁸Ni, the three observed 0⁺ states have been interpreted in terms of triple shape coexistence between spherical, oblate, and prolate deformed shapes. In the present work a new (0₂⁺) state at an energy of 1567 keV has been discovered in ⁷⁰Ni by using β-delayed, γ-ray spectroscopy following the decay of ⁷⁰Co. The precipitous drop in the energy of the prolate-deformed 0⁺ level between ⁶⁸Ni and ⁷⁰Ni with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large f_pg9/2d_5/2 model space, which predict a 0₂⁺ state at 1525 keV in ⁷⁰Ni. Finally, the result extends the shape-coexistence picture in the region to ⁷⁰Ni and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.

Authors:

Prokop, C. J. ^[1]; Crider, B. P. ^[1]; Liddick, S. N. ^[1]; Ayangeakaa, A. D. ^[2]; Carpenter, M. P. ^[2]; Carroll, J. J. ^[3]; Chen, J. ^[1]; Chiara, C. J. ^[3]; David, H. M. ^[2]; Dombos, A. C. ^[1]; Go, S. ^[4]; Harker, J. ^[5]; Janssens, R. V. F. ^[2]; Larson, N. ^[1]; Lauritsen, T. ^[2]; Lewis, R. ^[1]; Quinn, S. J. ^[1]; Recchia, F. ^[6]; Seweryniak, D. ^[2]; Spyrou, A. ^[1] more »

Michigan State Univ., East Lansing, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
U.S. Army Research Laboratory, Adelphi, MD (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
Università degli Studi di Padova (Italy)
Univ. of California, Berkeley, CA (United States)
Univ. of Maryland, College Park, MD (United States)

Publication Date:: Mon Dec 21 00:00:00 EST 2015

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1480699

Alternate Identifier(s):: OSTI ID: 1233876

Grant/Contract Number:: AC02-05CH11231; NA0000979; NA0002132; FG52-08NA28552; AC06-CH11357; FG02-94ER40834; FG02- 96ER40983; FG02-96ER40983

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C, Nuclear Physics

Additional Journal Information:: Journal Volume: 92; Journal Issue: 6; Journal ID: ISSN 0556-2813

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Prokop, C. J., Crider, B. P., Liddick, S. N., Ayangeakaa, A. D., Carpenter, M. P., Carroll, J. J., Chen, J., Chiara, C. J., David, H. M., Dombos, A. C., Go, S., Harker, J., Janssens, R. V.  F., Larson, N., Lauritsen, T., Lewis, R., Quinn, S. J., Recchia, F., Seweryniak, D., Spyrou, A., Suchyta, S., Walters, W. B., and Zhu, S. New low-energy 0+ state and shape coexistence in Ni70.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevC.92.061302.

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                    Prokop, C. J., Crider, B. P., Liddick, S. N., Ayangeakaa, A. D., Carpenter, M. P., Carroll, J. J., Chen, J., Chiara, C. J., David, H. M., Dombos, A. C., Go, S., Harker, J., Janssens, R. V.  F., Larson, N., Lauritsen, T., Lewis, R., Quinn, S. J., Recchia, F., Seweryniak, D., Spyrou, A., Suchyta, S., Walters, W. B., & Zhu, S. New low-energy 0+ state and shape coexistence in Ni70.  United States.  https://doi.org/10.1103/PhysRevC.92.061302

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                    Prokop, C. J., Crider, B. P., Liddick, S. N., Ayangeakaa, A. D., Carpenter, M. P., Carroll, J. J., Chen, J., Chiara, C. J., David, H. M., Dombos, A. C., Go, S., Harker, J., Janssens, R. V.  F., Larson, N., Lauritsen, T., Lewis, R., Quinn, S. J., Recchia, F., Seweryniak, D., Spyrou, A., Suchyta, S., Walters, W. B., and Zhu, S. Mon .  
"New low-energy 0+ state and shape coexistence in Ni70".  United States.  https://doi.org/10.1103/PhysRevC.92.061302.  https://www.osti.gov/servlets/purl/1480699.

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@article{osti_1480699,

  title        = {New low-energy 0+ state and shape coexistence in Ni70},

  author       = {Prokop, C. J. and Crider, B. P. and Liddick, S. N. and Ayangeakaa, A. D. and Carpenter, M. P. and Carroll, J. J. and Chen, J. and Chiara, C. J. and David, H. M. and Dombos, A. C. and Go, S. and Harker, J. and Janssens, R. V.  F. and Larson, N. and Lauritsen, T. and Lewis, R. and Quinn, S. J. and Recchia, F. and Seweryniak, D. and Spyrou, A. and Suchyta, S. and Walters, W. B. and Zhu, S.},

  abstractNote = {We report that in recent models, the neutron-rich Ni isotopes around N=40 are predicted to exhibit multiple low-energy excited 0+ states attributed to neutron and proton excitations across both the N=40 and Z=28 shell gaps. In 68Ni, the three observed 0+ states have been interpreted in terms of triple shape coexistence between spherical, oblate, and prolate deformed shapes. In the present work a new (02+) state at an energy of 1567 keV has been discovered in 70Ni by using β-delayed, γ-ray spectroscopy following the decay of 70Co. The precipitous drop in the energy of the prolate-deformed 0+ level between 68Ni and 70Ni with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large fpg9/2d5/2 model space, which predict a 02+ state at 1525 keV in 70Ni. Finally, the result extends the shape-coexistence picture in the region to 70Ni and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.},

  doi          = {10.1103/PhysRevC.92.061302},

  journal      = {Physical Review C, Nuclear Physics},

  number       = 6,

  volume       = 92,

  place        = {United States},

  year         = {Mon Dec 21 00:00:00 EST 2015},

  month        = {Mon Dec 21 00:00:00 EST 2015}

}

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Title: New low-energy 0+ state and shape coexistence in Ni 70

Abstract

Citation Formats

Possible rotational states in odd In nuclei journal, November 1975

β decay of 66 Co , 68 Co , and 70 Co journal, April 2000

Beta decay studies of neutron-rich 21Sc27Co nuclei at GANIL journal, May 2003

A triplet of differently shaped spin-zero states in the atomic nucleus 186Pb journal, May 2000

Collective bands in even mass Sn isotopes journal, April 1979

New Island of μ s Isomers in Neutron-Rich Nuclei around the Z = 28 and N = 40 Shell Closures journal, July 1998

Identification of deformed intruder states in semi-magic Ni 70 journal, April 2015

High efficiency beta-decay spectroscopy using a planar germanium double-sided strip detector journal, November 2013

Low energy levels in Ni 72 journal, October 2003

I. On the constitution of atoms and molecules journal, July 1913

Commissioning the A1900 projectile fragment separator journal, May 2003

Behavior of the Excited Deformed Band and Search for Shape Isomerism in Hg 184 journal, November 1976

Thirty-two-fold segmented germanium detectors to identify γ-rays from intermediate-energy exotic beams journal, July 2001

Levels in Odd-Mass Sb and I Isotopes Studied with the ( He 3 , d ) Reaction journal, May 1968

Evolution of Nuclear Shells due to the Tensor Force journal, November 2005

Island of inversion around Cr 64 journal, November 2010

Pairing-excitation versus intruder states in Ni 68 and Zr 90 journal, August 2010

New-generation Monte Carlo shell model for the K computer era journal, January 2012

Novel Features of Nuclear Forces and Shell Evolution in Exotic Nuclei journal, January 2010

Nuclear shape isomers journal, March 2012

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Sudden change in the nuclear charge distribution of very light mercury isotopes journal, March 1972

β-decay half-lives of very neutron-rich isotopes of elements from Ti to Ni journal, March 1998

Novel shape evolution in exotic Ni isotopes and configuration-dependent shell structure journal, March 2014

Collapse of the N = 28 Shell Closure in S 42 i journal, July 2007

Digital data acquisition system implementation at the National Superconducting Cyclotron Laboratory journal, March 2014

New T = 1 effective interactions for the f 5 ∕ 2 p 3 ∕ 2 p 1 ∕ 2 g 9 ∕ 2 model space: Implications for valence-mirror symmetry and seniority isomers journal, October 2004

Characterization of the low-lying 0 + and 2 + states in Ni 68 via β decay of the low-spin Co 68 isomer journal, March 2015

Possible deformed states in 115In and 117In journal, April 1967

Evidence for a new nuclear ‘magic number’ from the level structure of 54Ca journal, October 2013

Discovery of a new isomeric state in 68 Ni: Evidence for a highly deformed proton intruder state journal, March 2012

Shape coexistence in atomic nuclei journal, November 2011

Spectroscopy of neutron-rich nickel isotopes: Experimental results and microscopic interpretation journal, June 1988

Geant4—a simulation toolkit journal, July 2003

New effective interaction for f 5 pg 9 -shell nuclei journal, December 2009

Crossing of Near-Spherical and Deformed Bands in Hg 1 8 6 , 1 8 8 and New Isotopes Tl 1 8 6 , 1 8 8 journal, September 1975

Configuration mixing and relative transition rates between low-spin states in 68 Ni journal, October 2013

Low-spin states and the non-observation of a proposed 2202-keV, 0 + isomer in 68 Ni journal, October 2012

Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes between N = 40 and N = 50 journal, June 2010

Crossing of Near-Spherical and Deformed Bands in Hg 1 8 6 , 1 8 8 and new Isotopes Tl 1 8 6 , 1 8 8 . journal, September 1975

Novel features of nuclear forces and shell evolution in exotic nuclei text, January 2009

Discovery of a new isomeric state in $^{68}$Ni: Evidence for a highly-deformed proton intruder state text, January 2012

Novel shape evolution in exotic Ni isotopes and configuration-dependent shell structure text, January 2013

Monte Carlo shell model studies with massively parallel supercomputers journal, April 2017

Probing the Ga 31 ground-state properties in the region near Z = 28 with high-resolution laser spectroscopy journal, October 2017

E 0 transition strength in stable Ni isotopes journal, February 2019

Particle-phonon coupling: Understanding the variety of excitations in the low-lying spectra of odd nuclei journal, December 2019

Title: New low-energy $0^{+}$ state and shape coexistence in ${}^{70}{Ni}$

Possible rotational states in odd In nuclei
journal, November 1975

$β$ decay of $^{66} Co,$ $^{68} Co,$ and $^{70} Co$
journal, April 2000

Beta decay studies of neutron-rich 21Sc27Co nuclei at GANIL
journal, May 2003

A triplet of differently shaped spin-zero states in the atomic nucleus 186Pb
journal, May 2000

Collective bands in even mass Sn isotopes
journal, April 1979

New Island of $μ s$ Isomers in Neutron-Rich Nuclei around the $Z = 28$ and $N = 40$ Shell Closures
journal, July 1998

Identification of deformed intruder states in semi-magic ${}^{70}{Ni}$
journal, April 2015

High efficiency beta-decay spectroscopy using a planar germanium double-sided strip detector
journal, November 2013

Low energy levels in ${}^{72}{Ni}$
journal, October 2003

I. On the constitution of atoms and molecules
journal, July 1913

Commissioning the A1900 projectile fragment separator
journal, May 2003

Behavior of the Excited Deformed Band and Search for Shape Isomerism in ${}^{184}{Hg}$
journal, November 1976

Thirty-two-fold segmented germanium detectors to identify γ-rays from intermediate-energy exotic beams
journal, July 2001

Levels in Odd-Mass Sb and I Isotopes Studied with the ( ${}^{3}{He}, d$ ) Reaction
journal, May 1968

Evolution of Nuclear Shells due to the Tensor Force
journal, November 2005

Island of inversion around ${}^{64}{Cr}$
journal, November 2010

Pairing-excitation versus intruder states in ${}^{68}{Ni}$ and ${}^{90}{Zr}$
journal, August 2010

New-generation Monte Carlo shell model for the K computer era
journal, January 2012

Novel Features of Nuclear Forces and Shell Evolution in Exotic Nuclei
journal, January 2010

Nuclear shape isomers
journal, March 2012

Shape coexistence in ${}^{68}{Ni}$
journal, February 2014

Sudden change in the nuclear charge distribution of very light mercury isotopes
journal, March 1972

β-decay half-lives of very neutron-rich isotopes of elements from Ti to Ni
journal, March 1998

Novel shape evolution in exotic Ni isotopes and configuration-dependent shell structure
journal, March 2014

Collapse of the $N = 28$ Shell Closure in ${}^{42}S i$
journal, July 2007

Digital data acquisition system implementation at the National Superconducting Cyclotron Laboratory
journal, March 2014

New $T = 1$ effective interactions for the $f_{5 ∕ 2} p_{3 ∕ 2} p_{1 ∕ 2} g_{9 ∕ 2}$ model space: Implications for valence-mirror symmetry and seniority isomers
journal, October 2004

Characterization of the low-lying $0^{+}$ and $2^{+}$ states in ${}^{68}{Ni}$ via $β$ decay of the low-spin ${}^{68}{Co}$ isomer
journal, March 2015

Possible deformed states in 115In and 117In
journal, April 1967

Evidence for a new nuclear ‘magic number’ from the level structure of 54Ca
journal, October 2013

Discovery of a new isomeric state in $^{68}$ Ni: Evidence for a highly deformed proton intruder state
journal, March 2012

Shape coexistence in atomic nuclei
journal, November 2011

Spectroscopy of neutron-rich nickel isotopes: Experimental results and microscopic interpretation
journal, June 1988

Geant4—a simulation toolkit
journal, July 2003

New effective interaction for $f_{5} {pg}_{9}$ -shell nuclei
journal, December 2009

Crossing of Near-Spherical and Deformed Bands in ${}^{186, 188}{Hg}$ and New Isotopes ${}^{186, 188}{Tl}$
journal, September 1975

Configuration mixing and relative transition rates between low-spin states in $^{68}$ Ni
journal, October 2013

Low-spin states and the non-observation of a proposed 2202-keV, $0^{+}$ isomer in $^{68}$ Ni
journal, October 2012

Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes between $N = 40$ and $N = 50$
journal, June 2010

Crossing of Near-Spherical and Deformed Bands in ${}^{186, 188}{Hg}$ and new Isotopes ${}^{186, 188}{Tl}$ .
journal, September 1975

Novel features of nuclear forces and shell evolution in exotic nuclei
text, January 2009

Discovery of a new isomeric state in $^{68}$Ni: Evidence for a highly-deformed proton intruder state
text, January 2012

Novel shape evolution in exotic Ni isotopes and configuration-dependent shell structure
text, January 2013

Monte Carlo shell model studies with massively parallel supercomputers
journal, April 2017

Probing the ${}_{31}{Ga}$ ground-state properties in the region near $Z = 28$ with high-resolution laser spectroscopy
journal, October 2017

$E 0$ transition strength in stable Ni isotopes
journal, February 2019

Particle-phonon coupling: Understanding the variety of excitations in the low-lying spectra of odd nuclei
journal, December 2019