One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55 mirror pair Co55 and Ni55

Spieker, M.; Gade, A.; Weisshaar, D.; Brown, B. A.; Tostevin, J. A.; Longfellow, B.; Adrich, P.; Bazin, D.; Bentley, M. A.; Brown, J. R.; Campbell, C. M.; Diget, C. Aa.; Elman, B.; Glasmacher, T.; Hill, M.; Pritychenko, B.; Ratkiewicz, A.; Rhodes, D.

doi:10.1103/PhysRevC.99.051304

Title: One-proton and one-neutron knockout reactions from $N = Z = 28 {}^{56}{Ni}$ to the $A = 55$ mirror pair ${}^{55}{Co}$ and ${}^{55}{Ni}$

Abstract

We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei ⁵⁵Co and ⁵⁵Ni following one-nucleon knockout from a projectile beam of ⁵⁶Ni. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space which include charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2^- states in the A = 55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/2$$_1^+$$ state to the same two 3/2- states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E1 decay pattern, however, points at stronger mixing between the two lowest 3/2- states in ⁵⁵Co than in its mirror ⁵⁵Ni.

Authors:

Spieker, M. ^[1];

^[1]; Weisshaar, D. ^[1]; Brown, B. A. ^[1]; Tostevin, J. A. ^[2]; Longfellow, B. ^[1]; Adrich, P. ^[3]; Bazin, D. ^[1]; Bentley, M. A. ^[4]; Brown, J. R. ^[4]; Campbell, C. M. ^[5]; Diget, C. Aa. ^[4]; Elman, B. ^[1]; Glasmacher, T. ^[1]; Hill, M. ^[1]; Pritychenko, B. ^[6]; Ratkiewicz, A. ^[7]; Rhodes, D. ^[1]

Michigan State Univ., East Lansing, MI (United States)
Univ. of Surrey, Guildford (United Kingdom)
Michigan State Univ., East Lansing, MI (United States); National Centre for Nuclear Research, Otwock (Poland)
Univ. of York (United Kingdom)
Michigan State Univ., East Lansing, MI (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Wed May 22 00:00:00 EDT 2019

Research Org.:: Michigan State Univ., East Lansing, MI (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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

OSTI Identifier:: 1515408

Alternate Identifier(s):: OSTI ID: 1503520; OSTI ID: 1515110; OSTI ID: 1580878

Report Number(s):: BNL-211464-2019-JAAM
Journal ID: ISSN 2469-9985; PRVCAN

Grant/Contract Number:: NA0003180; PHY-1565546; PHY-1811855; SC0012704; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 99; Journal Issue: 5; 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


                    Spieker, M., Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J. A., Longfellow, B., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R., Campbell, C. M., Diget, C. Aa., Elman, B., Glasmacher, T., Hill, M., Pritychenko, B., Ratkiewicz, A., and Rhodes, D. One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55 mirror pair Co55 and Ni55.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevC.99.051304.

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                    Spieker, M., Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J. A., Longfellow, B., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R., Campbell, C. M., Diget, C. Aa., Elman, B., Glasmacher, T., Hill, M., Pritychenko, B., Ratkiewicz, A., & Rhodes, D. One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55 mirror pair Co55 and Ni55.  United States.  https://doi.org/10.1103/PhysRevC.99.051304

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                    Spieker, M., Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J. A., Longfellow, B., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R., Campbell, C. M., Diget, C. Aa., Elman, B., Glasmacher, T., Hill, M., Pritychenko, B., Ratkiewicz, A., and Rhodes, D. Wed .  
"One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55 mirror pair Co55 and Ni55".  United States.  https://doi.org/10.1103/PhysRevC.99.051304.  https://www.osti.gov/servlets/purl/1515408.

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@article{osti_1515408,

  title        = {One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55 mirror pair Co55 and Ni55},

  author       = {Spieker, M. and Gade, A. and Weisshaar, D. and Brown, B. A. and Tostevin, J. A. and Longfellow, B. and Adrich, P. and Bazin, D. and Bentley, M. A. and Brown, J. R. and Campbell, C. M. and Diget, C. Aa. and Elman, B. and Glasmacher, T. and Hill, M. and Pritychenko, B. and Ratkiewicz, A. and Rhodes, D.},

  abstractNote = {We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei 55Co and 55Ni following one-nucleon knockout from a projectile beam of 56Ni. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space which include charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2- states in the A = 55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/2$_1^+$ state to the same two 3/2- states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E1 decay pattern, however, points at stronger mixing between the two lowest 3/2- states in 55Co than in its mirror 55Ni.},

  doi          = {10.1103/PhysRevC.99.051304},

  journal      = {Physical Review C},

  number       = 5,

  volume       = 99,

  place        = {United States},

  year         = {Wed May 22 00:00:00 EDT 2019},

  month        = {Wed May 22 00:00:00 EDT 2019}

}

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Title: One-proton and one-neutron knockout reactions from N = Z = 28 Ni 56 to the A = 55 mirror pair Co 55 and Ni 55

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‘‘Bare’’ single-particle energies in Ni 56 journal, November 1996

Mirrored one-nucleon knockout reactions to the T z = ± 3 2 A = 53 mirror nuclei journal, February 2016

New Skyrme interaction for normal and exotic nuclei journal, July 1998

Unusual Isospin-Breaking and Isospin-Mixing Effects in the A = 35 Mirror Nuclei journal, April 2004

LaBr3:Ce scintillators for in-beam gamma-ray spectroscopy with fast beams of rare isotopes journal, August 2008

Valence nucleon populations in the Ni isotopes journal, March 2013

Excited levels and isobaric analogue states in55Co investigated with the54Fe(p, ?)55Co reaction journal, March 1977

Shape coexistence and isospin symmetry in A = 70 nuclei: Spectroscopy of the T = −1 nucleus 70Kr journal, October 2018

Shell model analysis of the Ni 56 spectrum in the full pf model space journal, June 2006

Beta decay of 57Zn* journal, December 2002

New effective interaction for p f -shell nuclei and its implications for the stability of the N = Z = 28 closed core journal, March 2004

The S800 spectrograph journal, May 2003

Isospin-breaking interactions studied through mirror energy differences journal, August 2015

Split Isobaric Analog State in Ni 55 : Case of Strong Isospin Mixing journal, December 2013

Charge Radii of Neutron Deficient Fe 52 , 53 Produced by Projectile Fragmentation journal, December 2016

Emergent properties of nuclei from ab initio coupled-cluster calculations journal, May 2016

The 1377 keV level in 57Co journal, February 1987

One-neutron knockout from Ni 57 journal, August 2006

Doubly-magic nature of Ni 56 : Measurement of the ground state nuclear magnetic dipole moment of Ni 55 journal, June 2009

Coherent Contributions to Isospin Mixing in the Mirror Pair As 67 and Se 67 journal, July 2009

Mean Lives and Angular Correlations in Co 57 with the Fe 54 ( α , p γ ) Co 57 Reaction journal, February 1971

First γ -ray spectroscopy of Fe 49 and Ni 53 : Isospin-breaking effects at large proton excess journal, July 2009

E 2 excitation strength in Ni 55 : Coupling of the Ni 56 2 1 + collective core vibration to the f 7 ∕ 2 odd neutron hole journal, December 2004

Systematics of intermediate-energy single-nucleon removal cross sections journal, November 2014

Heavy nuclei studied in projectile fragmentation journal, July 2003

Role of Long-Range Correlations in the Quenching of Spectroscopic Factors journal, November 2009

Isospin symmetry violation in mirror E 1 transitions: Coherent contributions from the giant isovector monopole resonance in the 67 As- 67 Se doublet journal, October 2012

Analog E 1 transitions and isospin mixing journal, August 2008

The 1g92 analogue state in 55Co journal, February 1976

Coulomb energy differences between high-spin states in isobaric multiplets journal, October 2007

Mirror Energy Differences at Large Isospin Studied through Direct Two-Nucleon Knockout journal, August 2013

Reduction of spectroscopic strength: Weakly-bound and strongly-bound single-particle states studied using one-nucleon knockout reactions journal, April 2008

Coulomb Energies journal, December 1969

Quasiparticle and quasihole states of nuclei around Ni 56 journal, June 2009

The Shell-Model Code NuShellX@MSU journal, June 2014

Single-particle structure of silicon isotopes approaching Si 42 journal, September 2014

Effective interaction for pf -shell nuclei journal, May 2002

Deeply-bound hole states in 57Co and the spreading of the 1d52 hole strength distribution journal, September 1987

Commissioning the A1900 projectile fragment separator journal, May 2003

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

Spectroscopic study of 55Co via the 54Fe(τ, d)55Co and 54Fe(τ, dp̃)54Fe reactions journal, September 1977

The role of isospin symmetry in collective nuclear structure journal, May 2006

Neutron spectroscopic factors of 55 Ni hole-states from ( p , d ) transfer reactions journal, September 2014

Mirror energy differences in the A = 31 mirror nuclei, S 31 and P 31 , and their significance in electromagnetic spin-orbit splitting journal, September 2005

Single-nucleon knockout reactions at fragmentation beam energies journal, February 2001

Magnetic Dipole Moment of Cu 57 , 59 Measured by In-Gas-Cell Laser Spectroscopy journal, August 2009

Low-lying levels in Cu 57 and the rp process journal, February 1996

Isobaric Multiplet Yrast Energies and Isospin Nonconserving Forces journal, September 2002

Nuclear structure in the vicinity of N = Z = 28 Ni 56 journal, November 2004

High-spin spectroscopy of natural and unnatural parity states in the mirror-pair V 45 / Ti 45 journal, February 2006

The magnetic dipole moment of 55Co journal, February 1973

NSCL and FRIB at Michigan State University: Nuclear science at the limits of stability journal, April 2016

Dynamics of nuclear single-particle structure in covariant theory of particle-vibration coupling: From light to superheavy nuclei journal, July 2011

Empirical isospin-nonconserving hamiltonians for shell-model calculations journal, January 1989

Measurement of the nuclear magnetic moments of Ni 57 and Fe 59 journal, August 1996

Study of the electromagnetic transitions in the 55Co nucleus journal, March 1972

Shell-model description of neutron-rich pf-shell nuclei with a new effective interaction GXPF 1 journal, April 2005

Spectroscopy of P 35 using the one-proton knockout reaction journal, March 2016

Neutron spectroscopic factors of Ni isotopes from transfer reactions journal, May 2009

Experimental study of the Ni 56 ( He 3 , d ) Cu 57 reaction in inverse kinematics journal, October 2009

In-medium similarity renormalization group for closed and open-shell nuclei journal, December 2016

Title: One-proton and one-neutron knockout reactions from $N = Z = 28 {}^{56}{Ni}$ to the $A = 55$ mirror pair ${}^{55}{Co}$ and ${}^{55}{Ni}$

‘‘Bare’’ single-particle energies in ${}^{56}{Ni}$
journal, November 1996

Mirrored one-nucleon knockout reactions to the $T_{z} = \pm \frac{3}{2} A = 53$ mirror nuclei
journal, February 2016

New Skyrme interaction for normal and exotic nuclei
journal, July 1998

Unusual Isospin-Breaking and Isospin-Mixing Effects in the $A = 35$ Mirror Nuclei
journal, April 2004

LaBr3:Ce scintillators for in-beam gamma-ray spectroscopy with fast beams of rare isotopes
journal, August 2008

Valence nucleon populations in the Ni isotopes
journal, March 2013

Excited levels and isobaric analogue states in55Co investigated with the54Fe(p, ?)55Co reaction
journal, March 1977

Shape coexistence and isospin symmetry in A = 70 nuclei: Spectroscopy of the T = −1 nucleus 70Kr
journal, October 2018

Shell model analysis of the ${}^{56}{Ni}$ spectrum in the full $pf$ model space
journal, June 2006

Beta decay of 57Zn*
journal, December 2002

New effective interaction for $p f$ -shell nuclei and its implications for the stability of the $N = Z = 28$ closed core
journal, March 2004

The S800 spectrograph
journal, May 2003

Isospin-breaking interactions studied through mirror energy differences
journal, August 2015

Split Isobaric Analog State in ${}^{55}{Ni}$ : Case of Strong Isospin Mixing
journal, December 2013

Charge Radii of Neutron Deficient ${}^{52, 53}{Fe}$ Produced by Projectile Fragmentation
journal, December 2016

Emergent properties of nuclei from ab initio coupled-cluster calculations
journal, May 2016

The 1377 keV level in 57Co
journal, February 1987

One-neutron knockout from ${}^{57}{Ni}$
journal, August 2006

Doubly-magic nature of ${}^{56}{Ni}$ : Measurement of the ground state nuclear magnetic dipole moment of ${}^{55}{Ni}$
journal, June 2009

Coherent Contributions to Isospin Mixing in the Mirror Pair ${}^{67}{As}$ and ${}^{67}{Se}$
journal, July 2009

Mean Lives and Angular Correlations in ${}^{57}{Co}$ with the ${}^{54}{Fe} (α, p γ) {}^{57}{Co}$ Reaction
journal, February 1971

First $γ$ -ray spectroscopy of ${}^{49}{Fe}$ and ${}^{53}{Ni}$ : Isospin-breaking effects at large proton excess
journal, July 2009

$E 2$ excitation strength in ${}^{55}{Ni}$ : Coupling of the ${}^{56}{Ni} 2_{1}^{+}$ collective core vibration to the $f_{7 ∕ 2}$ odd neutron hole
journal, December 2004

Systematics of intermediate-energy single-nucleon removal cross sections
journal, November 2014

Heavy nuclei studied in projectile fragmentation
journal, July 2003

Role of Long-Range Correlations in the Quenching of Spectroscopic Factors
journal, November 2009

Isospin symmetry violation in mirror $E 1$ transitions: Coherent contributions from the giant isovector monopole resonance in the $^{67}$ As- $^{67}$ Se doublet
journal, October 2012

Analog $E 1$ transitions and isospin mixing
journal, August 2008

The 1g92 analogue state in 55Co
journal, February 1976

Coulomb energy differences between high-spin states in isobaric multiplets
journal, October 2007

Mirror Energy Differences at Large Isospin Studied through Direct Two-Nucleon Knockout
journal, August 2013

Reduction of spectroscopic strength: Weakly-bound and strongly-bound single-particle states studied using one-nucleon knockout reactions
journal, April 2008

Coulomb Energies
journal, December 1969

Quasiparticle and quasihole states of nuclei around ${}^{56}{Ni}$
journal, June 2009

The Shell-Model Code NuShellX@MSU
journal, June 2014

Single-particle structure of silicon isotopes approaching ${}^{42}{Si}$
journal, September 2014

Effective interaction for $pf$ -shell nuclei
journal, May 2002

Deeply-bound hole states in 57Co and the spreading of the 1d52 hole strength distribution
journal, September 1987

Commissioning the A1900 projectile fragment separator
journal, May 2003

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

Spectroscopic study of 55Co via the 54Fe(τ, d)55Co and 54Fe(τ, dp̃)54Fe reactions
journal, September 1977

The role of isospin symmetry in collective nuclear structure
journal, May 2006

Neutron spectroscopic factors of 55 Ni hole-states from $(p, d)$ transfer reactions
journal, September 2014

Mirror energy differences in the $A = 31$ mirror nuclei, ${}^{31}S$ and ${}^{31}P$ , and their significance in electromagnetic spin-orbit splitting
journal, September 2005

Single-nucleon knockout reactions at fragmentation beam energies
journal, February 2001

Magnetic Dipole Moment of ${}^{57, 59}{Cu}$ Measured by In-Gas-Cell Laser Spectroscopy
journal, August 2009

Low-lying levels in ${}^{57}{Cu}$ and the rp process
journal, February 1996

Isobaric Multiplet Yrast Energies and Isospin Nonconserving Forces
journal, September 2002

Nuclear structure in the vicinity of $N = Z = 28$ ${}^{56}{Ni}$
journal, November 2004

High-spin spectroscopy of natural and unnatural parity states in the mirror-pair ${}^{45}V$ / ${}^{45}{Ti}$
journal, February 2006

The magnetic dipole moment of 55Co
journal, February 1973

NSCL and FRIB at Michigan State University: Nuclear science at the limits of stability
journal, April 2016

Dynamics of nuclear single-particle structure in covariant theory of particle-vibration coupling: From light to superheavy nuclei
journal, July 2011

Empirical isospin-nonconserving hamiltonians for shell-model calculations
journal, January 1989

Measurement of the nuclear magnetic moments of ${}^{57}{Ni}$ and ${}^{59}{Fe}$
journal, August 1996

Study of the electromagnetic transitions in the 55Co nucleus
journal, March 1972

Shell-model description of neutron-rich pf-shell nuclei with a new effective interaction GXPF 1
journal, April 2005

Spectroscopy of ${}^{35}P$ using the one-proton knockout reaction
journal, March 2016

Neutron spectroscopic factors of Ni isotopes from transfer reactions
journal, May 2009

Experimental study of the ${}^{56}{Ni}$ ( ${}^{3}{He}$ , $d$ ) ${}^{57}{Cu}$ reaction in inverse kinematics
journal, October 2009

In-medium similarity renormalization group for closed and open-shell nuclei
journal, December 2016