Single-particle and collective excitations in Ni62

Albers, M.; Zhu, S.; Ayangeakaa, A. D.; Janssens, R. V. F.; Gellanki, J.; Ragnarsson, I.; Alcorta, M.; Baugher, T.; Bertone, P. F.; Carpenter, M. P.; Chiara, C. J.; Chowdhury, P.; David, H. M.; Deacon, A. N.; DiGiovine, B.; Gade, A.; Hoffman, C. R.; Kondev, F. G.; Lauritsen, T.; Lister, C. J.; McCutchan, E. A.; Nair, C.; Rogers, A. M.; Seweryniak, D.

doi:10.1103/PhysRevC.94.034301

Title: Single-particle and collective excitations in ${}^{62}{Ni}$

Abstract

In this study, level sequences of rotational character have been observed in several nuclei in the A = 60 mass region. The importance of the deformation-driving πf_7/2 and νg_9/2 orbitals on the onset of nuclear deformation is stressed. A measurement was performed in order to identify collective rotational structures in the relatively neutron-rich ⁶²Ni isotope. Here, the ²⁶Mg(⁴⁸Ca,2α4nγ)⁶²Ni complex reaction at beam energies between 275 and 320 MeV was utilized. Reaction products were identified in mass (A) and charge (Z) with the fragment mass analyzer (FMA) and γ rays were detected with the Gammasphere array. As a result, two collective bands, built upon states of single-particle character, were identified and sizable deformation was assigned to both sequences based on the measured transitional quadrupole moments, herewith quantifying the deformation at high spin. In conclusion, based on cranked Nilsson-Strutinsky calculations and comparisons with deformed bands in the A = 60 mass region, the two rotational bands are understood as being associated with configurations involving multiple f_7/2 protons and g_9/2 neutrons, driving the nucleus to sizable prolate deformation.

Authors:

Albers, M. ^[1]; Zhu, S. ^[1]; Ayangeakaa, A. D. ^[1]; Janssens, R. V. F. ^[1]; Gellanki, J. ^[2]; Ragnarsson, I. ^[3]; Alcorta, M. ^[4]; Baugher, T. ^[5]; Bertone, P. F. ^[6]; Carpenter, M. P. ^[1]; Chiara, C. J. ^[7]; Chowdhury, P. ^[8]; David, H. M. ^[9]; Deacon, A. N. ^[10]; DiGiovine, B. ^[1]; Gade, A. ^[5]; Hoffman, C. R. ^[1]; Kondev, F. G. ^[1]; Lauritsen, T. ^[1]; Lister, C. J. ^[11] more »

Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Groningen, Groningen (The Netherlands)
Lund Univ., Lund (Sweden)
Argonne National Lab. (ANL), Argonne, IL (United States); TRIUMF, Vancouver, BC (Canada)
Michigan State Univ., East Lansing, MI (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Marshall Space Flight Center, Huntsville, AL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States); U.S. Army Research Lab., Adelphi, MD (United States)
Univ. of Massachusetts, Lowell, MA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
Univ. of Manchester, Manchester (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Massachusetts, Lowell, MA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: Thu Sep 01 00:00:00 EDT 2016

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

Sponsoring Org.:: National Science Foundation (NSF); Swedish Research Council (SRC); United Kingdom Science and Technology Facilities Council; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1332330

Alternate Identifier(s):: OSTI ID: 1314347

Grant/Contract Number:: AC02-06CH11357; FG02-94ER40834; FG02-94ER40848; FG02-08ER41556

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 94; Journal Issue: 3; Journal ID: ISSN 2469-9985

Publisher:: APS

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Albers, M., Zhu, S., Ayangeakaa, A. D., Janssens, R. V. F., Gellanki, J., Ragnarsson, I., Alcorta, M., Baugher, T., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., David, H. M., Deacon, A. N., DiGiovine, B., Gade, A., Hoffman, C. R., Kondev, F. G., Lauritsen, T., Lister, C. J., McCutchan, E. A., Nair, C., Rogers, A. M., and Seweryniak, D. Single-particle and collective excitations in Ni62.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevC.94.034301.

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                    Albers, M., Zhu, S., Ayangeakaa, A. D., Janssens, R. V. F., Gellanki, J., Ragnarsson, I., Alcorta, M., Baugher, T., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., David, H. M., Deacon, A. N., DiGiovine, B., Gade, A., Hoffman, C. R., Kondev, F. G., Lauritsen, T., Lister, C. J., McCutchan, E. A., Nair, C., Rogers, A. M., & Seweryniak, D. Single-particle and collective excitations in Ni62.  United States.  https://doi.org/10.1103/PhysRevC.94.034301

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                    Albers, M., Zhu, S., Ayangeakaa, A. D., Janssens, R. V. F., Gellanki, J., Ragnarsson, I., Alcorta, M., Baugher, T., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., David, H. M., Deacon, A. N., DiGiovine, B., Gade, A., Hoffman, C. R., Kondev, F. G., Lauritsen, T., Lister, C. J., McCutchan, E. A., Nair, C., Rogers, A. M., and Seweryniak, D. Thu .  
"Single-particle and collective excitations in Ni62".  United States.  https://doi.org/10.1103/PhysRevC.94.034301.  https://www.osti.gov/servlets/purl/1332330.

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@article{osti_1332330,

  title        = {Single-particle and collective excitations in Ni62},

  author       = {Albers, M. and Zhu, S. and Ayangeakaa, A. D. and Janssens, R. V. F. and Gellanki, J. and Ragnarsson, I. and Alcorta, M. and Baugher, T. and Bertone, P. F. and Carpenter, M. P. and Chiara, C. J. and Chowdhury, P. and David, H. M. and Deacon, A. N. and DiGiovine, B. and Gade, A. and Hoffman, C. R. and Kondev, F. G. and Lauritsen, T. and Lister, C. J. and McCutchan, E. A. and Nair, C. and Rogers, A. M. and Seweryniak, D.},

  abstractNote = {In this study, level sequences of rotational character have been observed in several nuclei in the A = 60 mass region. The importance of the deformation-driving πf7/2 and νg9/2 orbitals on the onset of nuclear deformation is stressed. A measurement was performed in order to identify collective rotational structures in the relatively neutron-rich 62Ni isotope. Here, the 26Mg(48Ca,2α4nγ)62Ni complex reaction at beam energies between 275 and 320 MeV was utilized. Reaction products were identified in mass (A) and charge (Z) with the fragment mass analyzer (FMA) and γ rays were detected with the Gammasphere array. As a result, two collective bands, built upon states of single-particle character, were identified and sizable deformation was assigned to both sequences based on the measured transitional quadrupole moments, herewith quantifying the deformation at high spin. In conclusion, based on cranked Nilsson-Strutinsky calculations and comparisons with deformed bands in the A = 60 mass region, the two rotational bands are understood as being associated with configurations involving multiple f7/2 protons and g9/2 neutrons, driving the nucleus to sizable prolate deformation.},

  doi          = {10.1103/PhysRevC.94.034301},

  journal      = {Physical Review C},

  number       = 3,

  volume       = 94,

  place        = {United States},

  year         = {Thu Sep 01 00:00:00 EDT 2016},

  month        = {Thu Sep 01 00:00:00 EDT 2016}

}

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Island of inversion around Cr 64 journal, November 2010

Structure of Fe 60 , 62 and the onset of ν g 9 / 2 occupancy journal, October 2010

Shape coexistence in Ni 68 journal, February 2014

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

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

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

Thorough γ -ray and particle decay investigations of Ni 58 journal, July 2009

Nature of yrast excitations near N = 40 : Level structure of 67 Ni journal, March 2012

Yrast decay schemes from heavy-ion + Ca 48 fusion-evaporation reactions: IV: Cr 53 , V 54 , Co 62 , and Ni 6 1 − 6 3 journal, October 1978

Three-body forces and persistence of spin-orbit shell gaps in medium-mass nuclei: Toward the doubly magic 78 Ni journal, May 2012

Spectroscopic studies with the use of deep-inelastic heavy-ion reactions journal, May 2006

The GAMMASPHERE journal, December 1990

Comparative study of rotational bands in the A ≈ 60 mass region: Modification of Nilsson parameters journal, February 2014

N = 40 Neutron Subshell Closure in the Ni 68 Nucleus journal, February 1995

Shape coexistence in neutron-rich nuclei near N = 40 journal, April 2013

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

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

Prompt proton decay and deformed bands in Ni 56 journal, June 2008

Level structure of the neutron-rich Cr 56 , 58 , 60 isotopes: Single-particle and collective aspects journal, December 2006

Evolution of shapes in 59Cu journal, July 2002

Calculating the nuclear mass in the very high angular momentum regime journal, July 2006

Yrast structure of Fe 64 journal, December 2006

Rotational bands with terminating properties in 59 Ni journal, May 2002

Rotational bands and particle-hole excitations at very high spin journal, March 1985

Termination of rotational bands: disappearance of quantum many-body collectivity journal, December 1999

Realistic effective interactions for nuclear systems journal, October 1995

Yrast structures in the neutron-rich isotopes Fe 59 , 60 and the role of the g 9 / 2 orbital journal, November 2007

Smooth Termination of Rotational Bands in Z 62 n : Evidence for a Loss of Collectivity journal, March 1998

Rotational bands near 56Ni journal, February 2001

Ni 58 : An Unpaired Band Crossing at New Heights of Angular Momentum for Rotating Nuclei journal, March 2006

High-angular-momentum structures in Zn 64 journal, March 2004

Magic features of 68Ni journal, June 1982

Nuclear Data Sheets for A = 63 journal, January 2001

Observation and Quadrupole-Moment Measurement of the First Superdeformed Band in the A ∼ 60 Mass Region journal, August 1997

Deformations and magnetic rotations in the Ni 60 nucleus journal, November 2008

Prompt α Decay of a Well-Deformed Band in N 58 i journal, February 2001

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

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

Multiple triaxial bands in Nd 138 journal, February 2015

Magnetic rotation and quasicollective structures in 58 Fe: Influence of the ν g 9 / 2 orbital journal, April 2012

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

Title: Single-particle and collective excitations in ${}^{62}{Ni}$

Differential lifetime measurements and identical superdeformed bands in $^{192, 194}$ Hg
journal, May 1997

Rotational bands in the semi-magic nucleus ⁵⁷ ₂₈ Ni ₂₉
journal, May 2010

A smoothly terminating rotational band in Zn
journal, March 1998

Role of the $ν g_{9 / 2}$ orbital in the development of collectivity in the $A \approx 60$ region: The case of ${}^{61}{Co}$
journal, April 2015

Spectroscopic study of the $^{64, 66, 68}$ Ni isotopes populated in $^{64}$ Ni + $^{238}$ U collisions
journal, December 2012

${}_{28}^{68}N i_{40}$ : Magicity versus Superfluidity
journal, February 2002

Rotational Bands in the Doubly Magic Nucleus ${}^{56}N i$
journal, May 1999

Single-particle and collective excitations in $^{63}$ Ni
journal, November 2013

Extensive $γ$ -ray spectroscopy of band structures in $_{30}^{62}$ Zn $_{32}$
journal, September 2012

Interpretation of the high spin states in ${}^{161}{Lu}$ : A paired and unpaired study
journal, July 2014

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

Structure of ${}^{60, 62}{Fe}$ and the onset of $ν g_{9 / 2}$ occupancy
journal, October 2010

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

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

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

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

Thorough $γ$ -ray and particle decay investigations of ${}^{58}{Ni}$
journal, July 2009

Nature of yrast excitations near $N = 40$ : Level structure of $^{67}$ Ni
journal, March 2012

Yrast decay schemes from heavy-ion + ${}^{48}{Ca}$ fusion-evaporation reactions: IV: ${}^{53}{Cr}$ , ${}^{54}V$ , ${}^{62}{Co}$ , and ${}^{61 - 63}{Ni}$
journal, October 1978

Three-body forces and persistence of spin-orbit shell gaps in medium-mass nuclei: Toward the doubly magic $^{78}$ Ni
journal, May 2012

Spectroscopic studies with the use of deep-inelastic heavy-ion reactions
journal, May 2006

The GAMMASPHERE
journal, December 1990

Comparative study of rotational bands in the $A \approx 60$ mass region: Modification of Nilsson parameters
journal, February 2014

$N = 40$ Neutron Subshell Closure in the ${}^{68}{Ni}$ Nucleus
journal, February 1995

Shape coexistence in neutron-rich nuclei near $N = 40$
journal, April 2013

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

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

Prompt proton decay and deformed bands in ${}^{56}{Ni}$
journal, June 2008

Level structure of the neutron-rich ${}^{56, 58, 60}{Cr}$ isotopes: Single-particle and collective aspects
journal, December 2006

Evolution of shapes in 59Cu
journal, July 2002

Calculating the nuclear mass in the very high angular momentum regime
journal, July 2006

Yrast structure of ${}^{64}{Fe}$
journal, December 2006

Rotational bands with terminating properties in $^{59} Ni$
journal, May 2002

Rotational bands and particle-hole excitations at very high spin
journal, March 1985

Termination of rotational bands: disappearance of quantum many-body collectivity
journal, December 1999

Realistic effective interactions for nuclear systems
journal, October 1995

Yrast structures in the neutron-rich isotopes ${}^{59, 60}{Fe}$ and the role of the $g_{9 / 2}$ orbital
journal, November 2007

Smooth Termination of Rotational Bands in ${}^{62}Z n$ : Evidence for a Loss of Collectivity
journal, March 1998

Rotational bands near 56Ni
journal, February 2001

${}^{58}{Ni}$ : An Unpaired Band Crossing at New Heights of Angular Momentum for Rotating Nuclei
journal, March 2006

High-angular-momentum structures in ${}^{64}{Zn}$
journal, March 2004

Magic features of 68Ni
journal, June 1982

Nuclear Data Sheets for A = 63
journal, January 2001

Observation and Quadrupole-Moment Measurement of the First Superdeformed Band in the $A \sim 60$ Mass Region
journal, August 1997

Deformations and magnetic rotations in the ${}^{60}{Ni}$ nucleus
journal, November 2008

Prompt $α$ Decay of a Well-Deformed Band in ${}^{58}N i$
journal, February 2001

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

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

Multiple triaxial bands in ${}^{138}{Nd}$
journal, February 2015

Magnetic rotation and quasicollective structures in $^{58}$ Fe: Influence of the $ν g_{9 / 2}$ orbital
journal, April 2012

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