Isospin symmetry in B(E2) values: Coulomb excitation study of Mg21

Ruotsalainen, P.; Henderson, J.; Hackman, G.; Sargsyan, G. H.; Launey, K. D.; Saxena, A.; Srivastava, P. C.; Stroberg, S. R.; Grahn, T.; Pakarinen, J.; Ball, G. C.; Julin, R.; Greenlees, P. T.; Smallcombe, J.; Andreoiu, C.; Bernier, N.; Bowry, M.; Buckner, M.; Caballero-Folch, R.; Chester, A.; Cruz, S.; Evitts, L. J.; Frederick, R.; Garnsworthy, A. B.; Holl, M.; Kurkjian, A.; Kisliuk, D.; Leach, K. G.; McGee, E.; Measures, J.; Mücher, D.; Park, J.; Sarazin, F.; Smith, J. K.; Southall, D.; Starosta, K.; Svensson, C. E.; Whitmore, K.; Williams, M.; Wu, C. Y.

doi:10.1103/PhysRevC.99.051301

Title: Isospin symmetry in $B (E 2)$ values: Coulomb excitation study of ${}^{21}{Mg}$

Abstract

The T_z = -$$\frac{3}{2}$$ nucleus ²¹Mg has been studied by Coulomb excitation on ¹⁹⁶Pt and ¹¹⁰+ ground state to the first excited $$\frac{1}{2}$$⁺ state in ²¹Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the $$\frac{1}{2}$$⁺ state yield an adopted value of B (E2; $$\frac{5}{2}$$⁺ → $$\frac{1}{2}$$⁺) = 13.3 (4) W.u. A new excited state at 1672(1) keV with tentative $$\frac{9}{2}$$⁺ assignment was also identified in ²¹Mg . This work demonstrates a large difference in the B (E2; $$\frac{5}{2}$$⁺ → $$\frac{1}{2}$$⁺) value between T = $$\frac{3}{2}$$, A = 21 mirror nuclei. Lastly, the difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the s d shell.

Authors:

Ruotsalainen, P. ^[1]; Henderson, J. ^[1]; Hackman, G. ^[1]; Sargsyan, G. H. ^[2]; Launey, K. D. ^[2]; Saxena, A. ^[3]; Srivastava, P. C. ^[3]; Stroberg, S. R. ^[1]; Grahn, T. ^[4]; Pakarinen, J. ^[4]; Ball, G. C. ^[1]; Julin, R. ^[4]; Greenlees, P. T. ^[4]; Smallcombe, J. ^[1]; Andreoiu, C. ^[5]; Bernier, N. ^[6]; Bowry, M. ^[1]; Buckner, M. ^[7]; Caballero-Folch, R. ^[1]; Chester, A. ^[5] more »

TRIUMF, Vancouver, BC (Canada)
Louisiana State Univ., Baton Rouge, LA (United States)
Indian Inst. of Technology Roorkee, Roorkee, IN (United States)
Univ. of Jyvaskyla (Finland)
Simon Fraser Univ., Burnaby, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
TRIUMF, Vancouver, BC (Canada); Univ. of Surrey, Guildford (United Kingdom)
Saint Mary's Univ., Halifax, Nova Scotia (Canada)
Univ. of Guelph, ON (Canada)
Colorado School of Mines, Golden, CO (United States)

Publication Date:: Wed May 01 00:00:00 EDT 2019

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

OSTI Identifier:: 1529817

Alternate Identifier(s):: OSTI ID: 1511086

Report Number(s):: LLNL-JRNL-749227
Journal ID: ISSN 2469-9985; PRVCAN; 934406

Grant/Contract Number:: AC52-07NA27344; SC0017649

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


                    Ruotsalainen, P., Henderson, J., Hackman, G., Sargsyan, G. H., Launey, K. D., Saxena, A., Srivastava, P. C., Stroberg, S. R., Grahn, T., Pakarinen, J., Ball, G. C., Julin, R., Greenlees, P. T., Smallcombe, J., Andreoiu, C., Bernier, N., Bowry, M., Buckner, M., Caballero-Folch, R., Chester, A., Cruz, S., Evitts, L. J., Frederick, R., Garnsworthy, A. B., Holl, M., Kurkjian, A., Kisliuk, D., Leach, K. G., McGee, E., Measures, J., Mücher, D., Park, J., Sarazin, F., Smith, J. K., Southall, D., Starosta, K., Svensson, C. E., Whitmore, K., Williams, M., and Wu, C. Y. Isospin symmetry in B(E2) values: Coulomb excitation study of Mg21.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevC.99.051301.

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                    Ruotsalainen, P., Henderson, J., Hackman, G., Sargsyan, G. H., Launey, K. D., Saxena, A., Srivastava, P. C., Stroberg, S. R., Grahn, T., Pakarinen, J., Ball, G. C., Julin, R., Greenlees, P. T., Smallcombe, J., Andreoiu, C., Bernier, N., Bowry, M., Buckner, M., Caballero-Folch, R., Chester, A., Cruz, S., Evitts, L. J., Frederick, R., Garnsworthy, A. B., Holl, M., Kurkjian, A., Kisliuk, D., Leach, K. G., McGee, E., Measures, J., Mücher, D., Park, J., Sarazin, F., Smith, J. K., Southall, D., Starosta, K., Svensson, C. E., Whitmore, K., Williams, M., & Wu, C. Y. Isospin symmetry in B(E2) values: Coulomb excitation study of Mg21.  United States.  https://doi.org/10.1103/PhysRevC.99.051301

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                    Ruotsalainen, P., Henderson, J., Hackman, G., Sargsyan, G. H., Launey, K. D., Saxena, A., Srivastava, P. C., Stroberg, S. R., Grahn, T., Pakarinen, J., Ball, G. C., Julin, R., Greenlees, P. T., Smallcombe, J., Andreoiu, C., Bernier, N., Bowry, M., Buckner, M., Caballero-Folch, R., Chester, A., Cruz, S., Evitts, L. J., Frederick, R., Garnsworthy, A. B., Holl, M., Kurkjian, A., Kisliuk, D., Leach, K. G., McGee, E., Measures, J., Mücher, D., Park, J., Sarazin, F., Smith, J. K., Southall, D., Starosta, K., Svensson, C. E., Whitmore, K., Williams, M., and Wu, C. Y. Wed .  
"Isospin symmetry in B(E2) values: Coulomb excitation study of Mg21".  United States.  https://doi.org/10.1103/PhysRevC.99.051301.  https://www.osti.gov/servlets/purl/1529817.

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@article{osti_1529817,

  title        = {Isospin symmetry in B(E2) values: Coulomb excitation study of Mg21},

  author       = {Ruotsalainen, P. and Henderson, J. and Hackman, G. and Sargsyan, G. H. and Launey, K. D. and Saxena, A. and Srivastava, P. C. and Stroberg, S. R. and Grahn, T. and Pakarinen, J. and Ball, G. C. and Julin, R. and Greenlees, P. T. and Smallcombe, J. and Andreoiu, C. and Bernier, N. and Bowry, M. and Buckner, M. and Caballero-Folch, R. and Chester, A. and Cruz, S. and Evitts, L. J. and Frederick, R. and Garnsworthy, A. B. and Holl, M. and Kurkjian, A. and Kisliuk, D. and Leach, K. G. and McGee, E. and Measures, J. and Mücher, D. and Park, J. and Sarazin, F. and Smith, J. K. and Southall, D. and Starosta, K. and Svensson, C. E. and Whitmore, K. and Williams, M. and Wu, C. Y.},

  abstractNote = {The Tz = -$\frac{3}{2}$ nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110+ ground state to the first excited $\frac{1}{2}$+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the $\frac{1}{2}$+ state yield an adopted value of B (E2; $\frac{5}{2}$+ → $\frac{1}{2}$+) = 13.3 (4) W.u. A new excited state at 1672(1) keV with tentative $\frac{9}{2}$+ assignment was also identified in 21Mg . This work demonstrates a large difference in the B (E2; $\frac{5}{2}$+ → $\frac{1}{2}$+) value between T = $\frac{3}{2}$, A = 21 mirror nuclei. Lastly, the difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the s d shell.},

  doi          = {10.1103/PhysRevC.99.051301},

  journal      = {Physical Review C},

  number       = 5,

  volume       = 99,

  place        = {United States},

  year         = {Wed May 01 00:00:00 EDT 2019},

  month        = {Wed May 01 00:00:00 EDT 2019}

}

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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 Article Ayangeakaa, A. D. ; Zhu, S. ; Janssens, R. V. F. ; ... - Physical Review. C, Nuclear Physics

An extensive study of the level structure of Co-61 has been performed following the complex Mg-26(Ca-48, 2 alpha 4np gamma)Co-61 reaction at beam energies of 275, 290, and 320 MeV using Gammasphere and the Fragment Mass Analyzer (FMA). The low-spin structure is discussed within the framework of shell-model calculations using the GXPF1A effective interaction. Two quasirotational bands consisting of stretched-E2 transitions have been established up to spins I = 41/2 and (43/2), and excitation energies of similar to 17 and similar to 20 MeV, respectively. These are interpreted as signature partners built on a neutron nu(g(9/2))(2) configuration coupled to amore »« less
https://doi.org/10.1103/PhysRevC.91.044327

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Title: Isospin symmetry in B ( E 2 ) values: Coulomb excitation study of Mg 21

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

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Nuclear Data Sheets for A = 110 journal, March 2000

Ab Initio Coupled-Cluster Effective Interactions for the Shell Model: Application to Neutron-Rich Oxygen and Carbon Isotopes text, January 2014

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Symmetry-guided large-scale shell-model theory text, January 2016

Title: Isospin symmetry in $B (E 2)$ values: Coulomb excitation study of ${}^{21}{Mg}$

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

Status of the Nuclear Shell Model
journal, December 1988

On the Displacement of Corresponding Energy Levels of $C^{13}$ and $N^{13}$
journal, February 1951

An Analysis of the Energy Levels of the Mirror Nuclei, $C^{13}$ and $N^{13}$
journal, December 1952

Isospin symmetry in the $s d$ shell: Transition strengths in the neutron-deficient $s d$ shell nucleus ${}^{33}{Ar}$
journal, November 2014

Nuclear Data Sheets for A = 21
journal, July 2015

Lifetimes of levels in ${}^{20, 21}F$ , ${}^{22}{Ne}$ , and ${}^{16}N$
journal, January 1983

Higher-spin structures in ${}^{21}F$ and ${}^{25}{Na}$
journal, September 2015

ISAC targets
journal, December 2013

Rare isotope beams at ISAC—target & ion source systems
journal, October 2013

The TRIUMF-ISAC gamma-ray escape suppressed specrometer, TIGRESS
journal, October 2013

Nuclear Shapes Studied by Coulomb Excitation
journal, December 1986

Level structure of 21Mg and the 20Na(p, γ)21Mg stellar reaction rate
journal, February 1992

Structure of excited states in ${}^{21}{Mg}$ studied in one-neutron knockout
journal, June 2008

Nuclear ground-state spin and magnetic moment of 21Mg
journal, August 2009

Gamma-Ray Decay of the Low-Lying Levels of $F^{21}$
journal, December 1970

Analysis methods of safe Coulomb-excitation experiments with radioactive ion beams using the GOSIA code
journal, April 2016

Nuclear Data Sheets for A = 196
journal, June 2007

Nuclear Data Sheets for A = 110
journal, May 2012

Method of Best Representation for Averages in Data Evaluation
journal, June 2014

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

Open $s d$ -shell nuclei from first principles
journal, July 2016

In-medium similarity renormalization group for open-shell nuclei
journal, June 2012

Nonperturbative Shell-Model Interactions from the In-Medium Similarity Renormalization Group
journal, October 2014

Nucleus-Dependent Valence-Space Approach to Nuclear Structure
journal, January 2017

Symmetry-guided large-scale shell-model theory
journal, July 2016

Collective Modes in Light Nuclei from First Principles
journal, December 2013

Ground and excited states of doubly open-shell nuclei from ab initio valence-space Hamiltonians
journal, May 2016

Ab Initio Coupled-Cluster Effective Interactions for the Shell Model: Application to Neutron-Rich Oxygen and Carbon Isotopes
journal, October 2014

Improved nuclear matter calculations from chiral low-momentum interactions
journal, March 2011

Ab initio electromagnetic observables with the in-medium similarity renormalization group
journal, September 2017

Optimized Chiral Nucleon-Nucleon Interaction at Next-to-Next-to-Leading Order
journal, May 2013

Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22 Mg
journal, July 2018

Isovector $E 2$ matrix elements from electromagnetic transitions in the $s - d$ shell: Experiment and shell-model calculations
journal, November 1982

Charge-independent trend of isoscalar matrix elements along the line
journal, January 2006

Nuclear Data Sheets for A = 110
journal, March 2000

Ab Initio Coupled-Cluster Effective Interactions for the Shell Model: Application to Neutron-Rich Oxygen and Carbon Isotopes
text, January 2014

Nonperturbative shell-model interactions from the in-medium similarity renormalization group
text, January 2014

Open $sd$-shell nuclei from first principles
text, January 2015

Ground and excited states of doubly open-shell nuclei from ab initio valence-space Hamiltonians
text, January 2015

A nucleus-dependent valence-space approach to nuclear structure
text, January 2016

Symmetry-guided large-scale shell-model theory
text, January 2016