Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions

doi:10.1103/PhysRevC.100.034317

Title: Probing the role of proton cross-shell excitations in ${}^{70}{Ni}$ using nucleon knockout reactions

Abstract

© 2019 American Physical Society. The neutron-rich Ni isotopes have attracted attention in recent years because of the occurrence of shape or configuration coexistence. We report on the difference in population of excited final states in Ni70 following γ-ray tagged one-proton, one-neutron, and two-proton knockout from Cu71, Ni71, and Zn72 rare-isotope beams, respectively. Using variations observed in the relative transition intensities, signaling the changed population of specific final states in the different reactions, the role of neutron and proton configurations in excited states of Ni70 is probed schematically, with the goal of identifying those that carry, as leading configuration, proton excitations across the Z=28 shell closure. Such states are suggested in the literature to form a collective structure associated with prolate deformation. Adding to the body of knowledge for Ni70, 29 new transitions are reported, of which 15 are placed in its level scheme.

Authors:

Elman, B. ^[1];

^[1]; Janssens, R. V. F. ^[2]; Ayangeakaa, A. D. ^[3]; Bazin, D. ^[1]; Belarge, J. ^[1]; Bender, P. C. ^[4]; Brown, B. A. ^[1]; Campbell, C. M. ^[5]; Carpenter, M. P. ^[6]; Crawford, H. L. ^[5]; Crider, B. P. ^[7]; Fallon, P. ^[5]; Forney, A. M. ^[8]; Harker, J. ^[9]; Liddick, S. N. ^[1]; Longfellow, B. ^[1]; Lunderberg, E. ^[1]; Prokop, C. J. ^[1]; Sethi, J. ^[8] more »

Michigan State Univ., East Lansing, MI (United States)
Univ. of North Carolina, Chapel Hill, NC (United States)
United States Naval Academy, Annapolis, MD (United States)
Michigan State Univ., East Lansing, MI (United States); Univ. of Massachusetts, Lowell, MA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Michigan State Univ., East Lansing, MI (United States); Mississippi State Univ., Mississippi State, MS (United States)
Univ. of Maryland, College Park, MD (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Tokyo (Japan); RIKEN, Saitama (Japan); Univ. of York (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: 2019-09-18

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of North Carolina, Chapel Hill, NC (United States)

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

OSTI Identifier:: 1574952

Alternate Identifier(s):: OSTI ID: 1562567; OSTI ID: 1656537; OSTI ID: 1658896; OSTI ID: 1659321

Grant/Contract Number:: AC02-06CH11357; FG02-94ER40834; FG02-08ER41556; FG02-97ER41041; FG02-97ER41033; NA0003180; SC0014537; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 100; Journal Issue: 3; 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


                    Elman, B., Gade, A., Janssens, R. V.  F., Ayangeakaa, A. D., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Campbell, C. M., Carpenter, M. P., Crawford, H. L., Crider, B. P., Fallon, P., Forney, A. M., Harker, J., Liddick, S. N., Longfellow, B., Lunderberg, E., Prokop, C. J., Sethi, J., Taniuchi, R., Walters, W. B., Weisshaar, D., and Zhu, S. Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions.  United States: N. p., 2019. 
        Web.  doi:10.1103/PhysRevC.100.034317.

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                    Elman, B., Gade, A., Janssens, R. V.  F., Ayangeakaa, A. D., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Campbell, C. M., Carpenter, M. P., Crawford, H. L., Crider, B. P., Fallon, P., Forney, A. M., Harker, J., Liddick, S. N., Longfellow, B., Lunderberg, E., Prokop, C. J., Sethi, J., Taniuchi, R., Walters, W. B., Weisshaar, D., & Zhu, S. Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions.  United States.  doi:10.1103/PhysRevC.100.034317.

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                    Elman, B., Gade, A., Janssens, R. V.  F., Ayangeakaa, A. D., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Campbell, C. M., Carpenter, M. P., Crawford, H. L., Crider, B. P., Fallon, P., Forney, A. M., Harker, J., Liddick, S. N., Longfellow, B., Lunderberg, E., Prokop, C. J., Sethi, J., Taniuchi, R., Walters, W. B., Weisshaar, D., and Zhu, S. Wed .  
        "Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions".  United States.  doi:10.1103/PhysRevC.100.034317.  https://www.osti.gov/servlets/purl/1574952.

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@article{osti_1574952,

  title        = {Probing the role of proton cross-shell excitations in Ni70 using nucleon knockout reactions},

  author       = {Elman, B. and Gade, A. and Janssens, R. V.  F. and Ayangeakaa, A. D. and Bazin, D. and Belarge, J. and Bender, P. C. and Brown, B. A. and Campbell, C. M. and Carpenter, M. P. and Crawford, H. L. and Crider, B. P. and Fallon, P. and Forney, A. M. and Harker, J. and Liddick, S. N. and Longfellow, B. and Lunderberg, E. and Prokop, C. J. and Sethi, J. and Taniuchi, R. and Walters, W. B. and Weisshaar, D. and Zhu, S.},

  abstractNote = {© 2019 American Physical Society. The neutron-rich Ni isotopes have attracted attention in recent years because of the occurrence of shape or configuration coexistence. We report on the difference in population of excited final states in Ni70 following γ-ray tagged one-proton, one-neutron, and two-proton knockout from Cu71, Ni71, and Zn72 rare-isotope beams, respectively. Using variations observed in the relative transition intensities, signaling the changed population of specific final states in the different reactions, the role of neutron and proton configurations in excited states of Ni70 is probed schematically, with the goal of identifying those that carry, as leading configuration, proton excitations across the Z=28 shell closure. Such states are suggested in the literature to form a collective structure associated with prolate deformation. Adding to the body of knowledge for Ni70, 29 new transitions are reported, of which 15 are placed in its level scheme.},

  doi          = {10.1103/PhysRevC.100.034317},

  journal      = {Physical Review C},

  number       = 3,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {9}

}

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Works referenced in this record:

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Title: Probing the role of proton cross-shell excitations in Ni 70 using nucleon knockout reactions

Abstract

Citation Formats

Focal plane detector for the S800 high-resolution spectrometer journal, February 1999

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

Cross-shell excitation in two-proton knockout: Structure of Ca 52 journal, August 2006

Study of excited states in 208 Pb by particle- γ coincidences with the 207 Pb ( d , p ) 208 Pb and 209 Bi ( t , α ) 208 Pb reactions journal, September 1997

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

Structure of Fe 70 : Single-particle and collective degrees of freedom journal, January 2019

r -Process Nucleosynthesis in Hot Accretion Disk Flows from Black Hole-Neutron Star Mergers journal, May 2008

Low energy levels in Ni 72 journal, October 2003

Commissioning the A1900 projectile fragment separator journal, May 2003

Single-particle structure at N = 29 : The structure of Ar 47 and first spectroscopy of S 45 journal, May 2016

Evidence for a β -decaying 1 / 2 − isomer in Ni 71 journal, April 2009

Shape Coexistence in Ni 78 as the Portal to the Fifth Island of Inversion journal, December 2016

Strong Neutron- γ Competition above the Neutron Threshold in the Decay of Co 70 journal, September 2016

Identification of the New Neutron-Rich Isotopes 70-74 Ni and 74-77 Cu in Thermal Neutron Fission of 235 U journal, October 1987

Type II shell evolution in A = 70 isobars from the N ≥ 40 island of inversion journal, February 2017

The S800 spectrograph journal, May 2003

New low-energy 0 + state and shape coexistence in Ni 70 journal, December 2015

Shape coexistence in Ni 68 journal, February 2014

Low-lying dipole response in the unstable Ni 70 nucleus journal, December 2018

D IRECT R EACTIONS WITH E XOTIC N UCLEI journal, December 2003

Proton separation energies derived from the (d, 3He) reaction on f-p shell nuclei at 52 MeV journal, September 1969

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

Shape isomerism at N = 40 : Discovery of a proton intruder state in Co 67 journal, October 2008

New CsI(Na) hodoscope array for the S800 spectrograph at NSCL journal, October 2011

Competing particle–hole excitations in 30Na: Constraining state-of-the-art effective interactions journal, September 2015

The performance of the γ-ray tracking array GRETINA for γ-ray spectroscopy with fast beams of rare isotopes journal, March 2017

Coupling of valence particles/holes to 68,70Ni studied via measurements of the B(E2) strength in 67,69,70Ni and 71Cu journal, May 2003

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

Enhanced low-energy γ -decay strength of Ni 70 and its robustness within the shell model journal, May 2018

In-beam nuclear spectroscopy of bound states with fast exotic ion beams journal, January 2008

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

Neutron single-particle strengths at N = 40 , 42: Neutron knockout from Ni 68 , 70 ground and isomeric states journal, November 2016

Experimental Neutron Capture Rate Constraint Far from Stability journal, June 2016

The performance of the Gamma-Ray Energy Tracking In-beam Nuclear Array GRETINA journal, May 2013

78Ni revealed as a doubly magic stronghold against nuclear deformation journal, May 2019

Shape coexistence in neutron-rich nuclei journal, January 2016

IsoTagger: Identification of isomeric nuclear states produced in fragmentation reactions with radioactive beams journal, January 2015

Multifaceted Quadruplet of Low-Lying Spin-Zero States in Ni 66 : Emergence of Shape Isomerism in Light Nuclei journal, April 2017

Lifetime measurement of the 4 1 + state of Ni 58 with the recoil distance method journal, August 2016

Shape coexistence from lifetime and branching-ratio measurements in 68,70 Ni journal, December 2016

Title: Probing the role of proton cross-shell excitations in ${}^{70}{Ni}$ using nucleon knockout reactions

Focal plane detector for the S800 high-resolution spectrometer
journal, February 1999

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

Cross-shell excitation in two-proton knockout: Structure of ${}^{52}{Ca}$
journal, August 2006

Study of excited states in $^{208}$ Pb by particle- $γ$ coincidences with the $^{207} Pb {(d, p)}^{208} Pb$ and $^{209} Bi (t, α)^{208} Pb$ reactions
journal, September 1997

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

Structure of ${}^{70}{Fe}$ : Single-particle and collective degrees of freedom
journal, January 2019

r -Process Nucleosynthesis in Hot Accretion Disk Flows from Black Hole-Neutron Star Mergers
journal, May 2008

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

Commissioning the A1900 projectile fragment separator
journal, May 2003

Single-particle structure at $N = 29$ : The structure of ${}^{47}{Ar}$ and first spectroscopy of ${}^{45}S$
journal, May 2016

Evidence for a $β$ -decaying $1 / 2^{-}$ isomer in ${}^{71}{Ni}$
journal, April 2009

Shape Coexistence in ${}^{78}{Ni}$ as the Portal to the Fifth Island of Inversion
journal, December 2016

Strong Neutron- $γ$ Competition above the Neutron Threshold in the Decay of ${}^{70}{Co}$
journal, September 2016

Identification of the New Neutron-Rich Isotopes ^70-74 Ni and ^74-77 Cu in Thermal Neutron Fission of ²³⁵ U
journal, October 1987

Type II shell evolution in A = 70 isobars from the N ≥ 40 island of inversion
journal, February 2017

The S800 spectrograph
journal, May 2003

New low-energy $0^{+}$ state and shape coexistence in ${}^{70}{Ni}$
journal, December 2015

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

Low-lying dipole response in the unstable ${}^{70}{Ni}$ nucleus
journal, December 2018

D IRECT R EACTIONS WITH E XOTIC N UCLEI
journal, December 2003

Proton separation energies derived from the (d, 3He) reaction on f-p shell nuclei at 52 MeV
journal, September 1969

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

Shape isomerism at $N = 40$ : Discovery of a proton intruder state in ${}^{67}{Co}$
journal, October 2008

New CsI(Na) hodoscope array for the S800 spectrograph at NSCL
journal, October 2011

Competing particle–hole excitations in 30Na: Constraining state-of-the-art effective interactions
journal, September 2015

The performance of the γ-ray tracking array GRETINA for γ-ray spectroscopy with fast beams of rare isotopes
journal, March 2017

Coupling of valence particles/holes to 68,70Ni studied via measurements of the B(E2) strength in 67,69,70Ni and 71Cu
journal, May 2003

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

Enhanced low-energy $γ -decay$ strength of ${}^{70}{Ni}$ and its robustness within the shell model
journal, May 2018

In-beam nuclear spectroscopy of bound states with fast exotic ion beams
journal, January 2008

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

Neutron single-particle strengths at $N = 40$ , 42: Neutron knockout from ${}^{68, 70}{Ni}$ ground and isomeric states
journal, November 2016

Experimental Neutron Capture Rate Constraint Far from Stability
journal, June 2016

The performance of the Gamma-Ray Energy Tracking In-beam Nuclear Array GRETINA
journal, May 2013

78Ni revealed as a doubly magic stronghold against nuclear deformation
journal, May 2019

Shape coexistence in neutron-rich nuclei
journal, January 2016

IsoTagger: Identification of isomeric nuclear states produced in fragmentation reactions with radioactive beams
journal, January 2015

Multifaceted Quadruplet of Low-Lying Spin-Zero States in ${}^{66}{Ni}$ : Emergence of Shape Isomerism in Light Nuclei
journal, April 2017

Lifetime measurement of the $4_{1}^{+}$ state of ${}^{58}{Ni}$ with the recoil distance method
journal, August 2016

Shape coexistence from lifetime and branching-ratio measurements in 68,70 Ni
journal, December 2016