Intruder dominance in the ${0_2^+}$ state of 32Mg studied with a novel technique for in-flight decays

doi:10.1103/PhysRevC.100.041301

This content will become publicly available on October 4, 2020

Title: Intruder dominance in the $${0_2^+}$$ state of ³²Mg studied with a novel technique for in-flight decays

Abstract

The development of advanced $γ$-ray tracking arrays allows for a sensitive new technique to investigate elusive states of exotic nuclei with fast rare-isotope beams. By taking advantage of the excellent energy and position resolution of the Gamma-Ray Energy Tracking In-beam Nuclear Array in this study, we developed a novel technique to identify in-flight isomeric decays of the 0$$^+_2$$ state in ³²Mg populated in a two-proton removal reaction. We confirm the 0$$^+_2$$ → 2$$^+_1$$ $γ$-ray transition of ³²Mg and constrain the 0$$^+_2$$ decay lifetime, suggesting a large collectivity. The small partial cross section populating the 0$$^+_2$$ state in this reaction provides experimental evidence for the reduced occupancy of the normal configuration of the 0$$^+_2$$ state, indicating the intruder dominance of this state.

Authors:

^[1]; Iwasaki, H. ^[1]; Ash, J. ^[1]; Bazin, D. ^[1]; Bender, P. C. ^[2]; Braunroth, T. ^[3]; Brown, B. A. ^[1]; Campbell, C. M. ^[4]; Crawford, H. L. ^[4]; Elman, B. ^[1];

^[1]; Grinder, M. ^[1]; Kobayashi, N. ^[5]; Longfellow, B. ^[1]; Macchiavelli, A. O. ^[4]; Mijatović, T. ^[6]; Pereira, J. ^[7];

^[7]; Rhodes, D. ^[1]; Tostevin, J. A. ^[8] more »

Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Physics and Astronomy
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics
Univ. zu Köln, Köln (Germany). Inst. für Kernphysik
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Osaka Univ., Ibaraki, Osaka (Japan). Research Center for Nuclear Physics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Ruđer Boškovic Inst., Zagreb (Croatia)
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Univ. of Surrey, Guildford, Surrey (United Kingdom). Dept. of Physics

Publication Date:: 2019-10-04

Research Org.:: Univ. of California, Berkeley, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1570217

Grant/Contract Number:: NA0003180

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 100; Journal Issue: 4; 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


                    Elder, R., Iwasaki, H., Ash, J., Bazin, D., Bender, P. C., Braunroth, T., Brown, B. A., Campbell, C. M., Crawford, H. L., Elman, B., Gade, A., Grinder, M., Kobayashi, N., Longfellow, B., Macchiavelli, A. O., Mijatović, T., Pereira, J., Revel, A., Rhodes, D., Tostevin, J. A., and Weisshaar, D. Intruder dominance in the ${0_2^+}$ state of 32Mg studied with a novel technique for in-flight decays.  United States: N. p., 2019. 
        Web.  doi:10.1103/PhysRevC.100.041301.

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                    Elder, R., Iwasaki, H., Ash, J., Bazin, D., Bender, P. C., Braunroth, T., Brown, B. A., Campbell, C. M., Crawford, H. L., Elman, B., Gade, A., Grinder, M., Kobayashi, N., Longfellow, B., Macchiavelli, A. O., Mijatović, T., Pereira, J., Revel, A., Rhodes, D., Tostevin, J. A., & Weisshaar, D. Intruder dominance in the ${0_2^+}$ state of 32Mg studied with a novel technique for in-flight decays.  United States.  doi:10.1103/PhysRevC.100.041301.

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                    Elder, R., Iwasaki, H., Ash, J., Bazin, D., Bender, P. C., Braunroth, T., Brown, B. A., Campbell, C. M., Crawford, H. L., Elman, B., Gade, A., Grinder, M., Kobayashi, N., Longfellow, B., Macchiavelli, A. O., Mijatović, T., Pereira, J., Revel, A., Rhodes, D., Tostevin, J. A., and Weisshaar, D. Fri .  
        "Intruder dominance in the ${0_2^+}$ state of 32Mg studied with a novel technique for in-flight decays".  United States.  doi:10.1103/PhysRevC.100.041301.

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@article{osti_1570217,

  title        = {Intruder dominance in the ${0_2^+}$ state of 32Mg studied with a novel technique for in-flight decays},

  author       = {Elder, R. and Iwasaki, H. and Ash, J. and Bazin, D. and Bender, P. C. and Braunroth, T. and Brown, B. A. and Campbell, C. M. and Crawford, H. L. and Elman, B. and Gade, A. and Grinder, M. and Kobayashi, N. and Longfellow, B. and Macchiavelli, A. O. and Mijatović, T. and Pereira, J. and Revel, A. and Rhodes, D. and Tostevin, J. A. and Weisshaar, D.},

  abstractNote = {The development of advanced $γ$-ray tracking arrays allows for a sensitive new technique to investigate elusive states of exotic nuclei with fast rare-isotope beams. By taking advantage of the excellent energy and position resolution of the Gamma-Ray Energy Tracking In-beam Nuclear Array in this study, we developed a novel technique to identify in-flight isomeric decays of the 0$^+_2$ state in 32Mg populated in a two-proton removal reaction. We confirm the 0$^+_2$ → 2$^+_1$ $γ$-ray transition of 32Mg and constrain the 0$^+_2$ decay lifetime, suggesting a large collectivity. The small partial cross section populating the 0$^+_2$ state in this reaction provides experimental evidence for the reduced occupancy of the normal configuration of the 0$^+_2$ state, indicating the intruder dominance of this state.},

  doi          = {10.1103/PhysRevC.100.041301},

  journal      = {Physical Review C},

  number       = 4,

  volume       = 100,

  place        = {United States},

  year         = {2019},

  month        = {10}

}

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This content will become publicly available on October 4, 2020

Title: Intruder dominance in the $${0_2^+}$$ state of 32Mg studied with a novel technique for in-flight decays

Abstract

Citation Formats

Role of intruder configurations in Ne and Mg journal, September 1999

Large deformation of the very neutron-rich nucleus 32Mg from intermediate-energy Coulomb excitation journal, March 1995

Quadrupole Collectivity in 3 2 , 3 4 , 3 6 , 3 8 Si and the N = 20 Shell Closure journal, March 1998

Spectroscopy of strongly deformed Ne 32 by proton knockout reactions journal, January 2019

Isomeric 0+ state in 12Be journal, May 2003

“Safe” Coulomb Excitation of Mg 30 journal, May 2005

Status of the Nuclear Shell Model journal, December 1988

Large collectivity of 34Mg journal, December 2001

Beta decay of Na 2 7 − 3 2 and their descendants journal, January 1979

The Mg 30 ( t , p ) Mg 32 “puzzle” reexamined journal, November 2016

Commissioning the A1900 projectile fragment separator journal, May 2003

Nuclear magic numbers: New features far from stability journal, October 2008

Evaluation of theoretical conversion coefficients using BrIcc journal, May 2008

Island of inversion around Cr 64 journal, November 2010

Exotic neutron-rich medium-mass nuclei with realistic nuclear forces journal, February 2017

New “USD” Hamiltonians for the sd shell journal, September 2006

New Direct Reaction: Two-Proton Knockout from Neutron-Rich Nuclei journal, June 2003

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

New structure information on 30Mg, 31Mg and 32Mg journal, July 2005

Characterization of a gamma-ray tracking array: A comparison of GRETINA and Gammasphere using a 60Co source journal, November 2016

Direct Evidence for the Breakdown of the N = 8 Shell Closure in B 12 e journal, July 2000

The S800 spectrograph journal, May 2003

Measurement of E 2 transition strengths in Mg 32 , 34 journal, November 2005

Scientific Opportunities with the NSCL Coupled Cyclotron Facility journal, January 2002

Varying shell gap and deformation in N ∼ 20 unstable nuclei studied by the Monte Carlo shell model journal, October 1999

Shape coexistence in the N = 19 neutron-rich nucleus 31 Mg explored by β – γ spectroscopy of spin-polarized 31 Na journal, April 2017

Collapse of the conventional shell-model ordering in the very-neutron-rich isotopes of Na and Mg journal, November 1980

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

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

Merging of the islands of inversion at N = 20 and N = 28 journal, July 2014

Unveiling the Intruder Deformed 0 2 + State in Si 34 journal, August 2012

On the structure of 30 Mg and 32 Mg journal, May 2017

Collectivity at N = 40 in neutron-rich Cr 64 journal, May 2010

Geant4—a simulation toolkit journal, July 2003

Islands of insight in the nuclear chart journal, December 2010

Direct measurement of the masses of Li 11 and Na 2 6 − 3 2 with an on-line mass spectrometer journal, August 1975

Nuclear Data Sheets for A = 30 journal, September 2010

Three-Body Forces and the Limit of Oxygen Isotopes journal, July 2010

Discovery of the Shape Coexisting 0 + State in Mg 32 by a Two Neutron Transfer Reaction journal, December 2010

Diffraction dissociation contributions to two-nucleon knockout reactions and the suppression of shell-model strength journal, December 2006

Two-proton knockout from Mg 32 : Intruder amplitudes in Ne 30 and implications for the binding of F 29 , 31 journal, April 2010

Relativistic Coulomb excitation in Mg 32 near 200 MeV/nucleon with a thick target journal, July 2015

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

Mass systematics for A =29–44 nuclei: The deformed A ∼32 region journal, March 1990

Nuclear Data Sheets for A = 32 journal, September 2011

Electric and nuclear transition strength in 30,32Mg journal, August 2001

Title: Intruder dominance in the $${0_2^+}$$ state of ³²Mg studied with a novel technique for in-flight decays

Role of intruder configurations in Ne and Mg
journal, September 1999

Large deformation of the very neutron-rich nucleus 32Mg from intermediate-energy Coulomb excitation
journal, March 1995

Quadrupole Collectivity in $^{32, 34, 36, 38} Si$ and the $N = 20$ Shell Closure
journal, March 1998

Spectroscopy of strongly deformed ${}^{32}{Ne}$ by proton knockout reactions
journal, January 2019

Isomeric 0+ state in 12Be
journal, May 2003

“Safe” Coulomb Excitation of ${}^{30}{Mg}$
journal, May 2005

Status of the Nuclear Shell Model
journal, December 1988

Large collectivity of 34Mg
journal, December 2001

Beta decay of ${}^{27 - 32}{Na}$ and their descendants
journal, January 1979

The ${}^{30}{Mg} (t, p) {}^{32}{Mg}$ “puzzle” reexamined
journal, November 2016

Commissioning the A1900 projectile fragment separator
journal, May 2003

Nuclear magic numbers: New features far from stability
journal, October 2008

Evaluation of theoretical conversion coefficients using BrIcc
journal, May 2008

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

Exotic neutron-rich medium-mass nuclei with realistic nuclear forces
journal, February 2017

New “USD” Hamiltonians for the $sd$ shell
journal, September 2006

New Direct Reaction: Two-Proton Knockout from Neutron-Rich Nuclei
journal, June 2003

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

New structure information on 30Mg, 31Mg and 32Mg
journal, July 2005

Characterization of a gamma-ray tracking array: A comparison of GRETINA and Gammasphere using a 60Co source
journal, November 2016

Direct Evidence for the Breakdown of the $N = 8$ Shell Closure in ${}^{12}B e$
journal, July 2000

The S800 spectrograph
journal, May 2003

Measurement of $E 2$ transition strengths in ${}^{32, 34}{Mg}$
journal, November 2005

Scientific Opportunities with the NSCL Coupled Cyclotron Facility
journal, January 2002

Varying shell gap and deformation in $N \sim 20$ unstable nuclei studied by the Monte Carlo shell model
journal, October 1999

Shape coexistence in the N = 19 neutron-rich nucleus 31 Mg explored by β – γ spectroscopy of spin-polarized 31 Na
journal, April 2017

Collapse of the conventional shell-model ordering in the very-neutron-rich isotopes of Na and Mg
journal, November 1980

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

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

Merging of the islands of inversion at $N = 20$ and $N = 28$
journal, July 2014

Unveiling the Intruder Deformed $0_{2}^{+}$ State in ${}^{34}{Si}$
journal, August 2012

On the structure of ³⁰ Mg and ³² Mg
journal, May 2017

Collectivity at $N = 40$ in neutron-rich ${}^{64}{Cr}$
journal, May 2010

Geant4—a simulation toolkit
journal, July 2003

Islands of insight in the nuclear chart
journal, December 2010

Direct measurement of the masses of ${}^{11}{Li}$ and ${}^{26 - 32}{Na}$ with an on-line mass spectrometer
journal, August 1975

Nuclear Data Sheets for A = 30
journal, September 2010

Three-Body Forces and the Limit of Oxygen Isotopes
journal, July 2010

Discovery of the Shape Coexisting $0^{+}$ State in ${}^{32}{Mg}$ by a Two Neutron Transfer Reaction
journal, December 2010

Diffraction dissociation contributions to two-nucleon knockout reactions and the suppression of shell-model strength
journal, December 2006

Two-proton knockout from ${}^{32}{Mg}$ : Intruder amplitudes in ${}^{30}{Ne}$ and implications for the binding of ${}^{29, 31}F$
journal, April 2010

Relativistic Coulomb excitation in ${}^{32}{Mg}$ near 200 MeV/nucleon with a thick target
journal, July 2015

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

Mass systematics for A =29–44 nuclei: The deformed A ∼32 region
journal, March 1990

Nuclear Data Sheets for A = 32
journal, September 2011

Electric and nuclear transition strength in 30,32Mg
journal, August 2001