Establishing the Maximum Collectivity in Highly Deformed N = Z Nuclei

Llewellyn, Ryan D. O.; Bentley, M.  A.; Wadsworth, R.; Iwasaki, H.; Dobaczewski, J.; de Angelis, G.; Ash, J.; Bazin, D.; Bender, P. C.; Cederwall, B.; Crider, B. P.; Doncel, M.; Elder, R.; Elman, B.; Gade, A.; Grinder, M.; Haylett, T.; Jenkins, D. G.; Lee, I. Y.; Longfellow, B.; Lunderberg, E.; Mijatović, T.; Milne, S. A.; Muir, D.; Pastore, A.; Rhodes, D.; Weisshaar, D.

doi:10.1103/physrevlett.124.152501

Title: Establishing the Maximum Collectivity in Highly Deformed N = Z Nuclei

Abstract

The lifetimes of the first excited 2+ states in the N=Z nuclei 80Zr, 78Y, and 76Sr have been measured using the γ-ray line shape method following population via nucleon-knockout reactions from intermediate-energy rare-isotope beams. The extracted reduced electromagnetic transition strengths yield new information on where the collectivity is maximized and provide evidence for a significant, and as yet unexplained, odd-odd vs even-even staggering in the observed values. The experimental results are analyzed in the context of state-of-the-art nuclear density-functional model calculations.

Authors:

^[1]; Bentley, M. A. ^[1];

^[1]; Iwasaki, H. ^[2]; Dobaczewski, J. ^[3]; de Angelis, G. ^[4]; Ash, J. ^[2]; Bazin, D. ^[2]; Bender, P. C. ^[5]; Cederwall, B. ^[6]; Crider, B. P. ^[7]; Doncel, M. ^[8]; Elder, R. ^[2]; Elman, B. ^[2]; Gade, A. ^[2]; Grinder, M. ^[2]; Haylett, T. ^[1]; Jenkins, D. G. ^[1]; Lee, I. Y. ^[9]; Longfellow, B. ^[2] more »

University of York (United Kingdom)
Michigan State University, East Lansing, MI (United States)
University of York (United Kingdom); University of Warsaw (Poland)
Legnaro National Laboratory (Italy)
Michigan State University, East Lansing, MI (United States); University of Massachusetts, Lowell, MA (United States)
KTH Department of Physics, Stockholm (Sweden)
Michigan State University, East Lansing, MI (United States); Mississippi State University, Mississippi State, MS (United States)
University of Liverpool (United Kingdom)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Michigan State University, East Lansing, MI (United States); Ruer Bošković Institute, Zagreb (Croatia)

Publication Date:: 2020-04-16

Research Org.:: Univ. of California, Berkeley, CA (United States); Michigan State Univ., East Lansing, MI (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Polish National Science Centre (NCN); USDOE Office of Science (SC)

OSTI Identifier:: 1650565

Alternate Identifier(s):: OSTI ID: 1615111; OSTI ID: 1650567

Grant/Contract Number:: NA0003180; SC0014537; SC0020451; AC02-05CH11231; PHY-1565546; 2018/31/B/ST2/02220

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 124; Journal Issue: 15; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Collective levels; Direct reactions; Electromagnetic transitions; Lifetimes & widths; Nuclear density functional theory; Nuclear fragmentation; 59 ≤ A ≤ 89; Nuclear structure & decays

Citation Formats


                    Llewellyn, Ryan D. O., Bentley, M.  A., Wadsworth, R., Iwasaki, H., Dobaczewski, J., de Angelis, G., Ash, J., Bazin, D., Bender, P. C., Cederwall, B., Crider, B. P., Doncel, M., Elder, R., Elman, B., Gade, A., Grinder, M., Haylett, T., Jenkins, D. G., Lee, I. Y., Longfellow, B., Lunderberg, E., Mijatović, T., Milne, S. A., Muir, D., Pastore, A., Rhodes, D., and Weisshaar, D.. Establishing the Maximum Collectivity in Highly Deformed N = Z Nuclei.  United States: N. p., 2020. 
Web.  doi:10.1103/physrevlett.124.152501.

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                    Llewellyn, Ryan D. O., Bentley, M.  A., Wadsworth, R., Iwasaki, H., Dobaczewski, J., de Angelis, G., Ash, J., Bazin, D., Bender, P. C., Cederwall, B., Crider, B. P., Doncel, M., Elder, R., Elman, B., Gade, A., Grinder, M., Haylett, T., Jenkins, D. G., Lee, I. Y., Longfellow, B., Lunderberg, E., Mijatović, T., Milne, S. A., Muir, D., Pastore, A., Rhodes, D., & Weisshaar, D.. Establishing the Maximum Collectivity in Highly Deformed N = Z Nuclei.  United States.  https://doi.org/10.1103/physrevlett.124.152501

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                    Llewellyn, Ryan D. O., Bentley, M.  A., Wadsworth, R., Iwasaki, H., Dobaczewski, J., de Angelis, G., Ash, J., Bazin, D., Bender, P. C., Cederwall, B., Crider, B. P., Doncel, M., Elder, R., Elman, B., Gade, A., Grinder, M., Haylett, T., Jenkins, D. G., Lee, I. Y., Longfellow, B., Lunderberg, E., Mijatović, T., Milne, S. A., Muir, D., Pastore, A., Rhodes, D., and Weisshaar, D.. Thu .  
"Establishing the Maximum Collectivity in Highly Deformed N = Z Nuclei".  United States.  https://doi.org/10.1103/physrevlett.124.152501.  https://www.osti.gov/servlets/purl/1650565.

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@article{osti_1650565,

  title        = {Establishing the Maximum Collectivity in Highly Deformed N = Z Nuclei},

  author       = {Llewellyn, Ryan D. O. and Bentley, M.  A. and Wadsworth, R. and Iwasaki, H. and Dobaczewski, J. and de Angelis, G. and Ash, J. and Bazin, D. and Bender, P. C. and Cederwall, B. and Crider, B. P. and Doncel, M. and Elder, R. and Elman, B. and Gade, A. and Grinder, M. and Haylett, T. and Jenkins, D. G. and Lee, I. Y. and Longfellow, B. and Lunderberg, E. and Mijatović, T. and Milne, S. A. and Muir, D. and Pastore, A. and Rhodes, D. and Weisshaar, D.},

  abstractNote = {The lifetimes of the first excited 2+ states in the N=Z nuclei 80Zr, 78Y, and 76Sr have been measured using the γ-ray line shape method following population via nucleon-knockout reactions from intermediate-energy rare-isotope beams. The extracted reduced electromagnetic transition strengths yield new information on where the collectivity is maximized and provide evidence for a significant, and as yet unexplained, odd-odd vs even-even staggering in the observed values. The experimental results are analyzed in the context of state-of-the-art nuclear density-functional model calculations.},

  doi          = {10.1103/physrevlett.124.152501},

  journal      = {Physical Review Letters},

  number       = 15,

  volume       = 124,

  place        = {United States},

  year         = {2020},

  month        = {4}

}

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Title: Establishing the Maximum Collectivity in Highly Deformed N = Z Nuclei

Abstract

Citation Formats

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Quadrupole Deformation of the Self-Conjugate Nucleus Kr 72 journal, July 2005

Structure of even-even nuclei using a mapped collective Hamiltonian and the D1S Gogny interaction journal, January 2010

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Neutron-proton correlations in an exactly solvable model journal, April 1997

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Enhancement of high-spin collectivity in N=Z nuclei by the isoscalar neutron–proton pairing journal, January 2017

Lifetime effects for high-resolution gamma-ray spectroscopy at relativistic energies and their implications for the RISING spectrometer journal, February 2010

Gamma radiation from the N=Z nucleus 40 80 Zr 40 journal, September 1987

Overview of neutron–proton pairing journal, September 2014

Observation of mutually enhanced collectivity in self-conjugate 38 76 Sr 38 journal, April 2012

Evidence for a spin-aligned neutron–proton paired phase from the level structure of 92Pd journal, December 2010

Nilsson-SU3 self-consistency in heavy N = Z nuclei journal, August 2015

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Competition between T = 0 and T = 1 pairing in proton-rich nuclei
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Energy-density-functional calculations including proton-neutron mixing
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Local density approximation for proton-neutron pairing correlations: Formalism
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Alignment Delays in the $N = Z$ Nuclei ${}^{72}K r$ , ${}^{76}S r$ , and ${}^{80}Z r$
journal, September 2001

Isospin-invariant Skyrme energy-density-functional approach with axial symmetry
journal, May 2014

Commissioning the A1900 projectile fragment separator
journal, May 2003

Evolution of Collectivity in ${}^{72}{Kr}$ : Evidence for Rapid Shape Transition
journal, April 2014

Shell model Monte Carlo studies of nuclei in the A∼80 mass region
journal, December 2003

Symmetry restoration in the mean-field description of proton-neutron pairing
journal, August 2019

A simulation tool for Recoil Distance Method lifetime measurements at NSCL
journal, January 2009

Nuclear energy density optimization
journal, August 2010

The S800 spectrograph
journal, May 2003

Nuclear ground-state masses and deformations: FRDM(2012)
journal, May 2016

Multiple shape coexistence in the nucleus Zr80
journal, November 2011

Systematics of even-even Tz= 1 nuclei in the A= 80 region: High-spin rotational bands in 74Kr, 78Sr, and 82Zr
journal, July 1997

Global performance of covariant energy density functionals: Ground state observables of even-even nuclei and the estimate of theoretical uncertainties
journal, May 2014

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

Quadrupole Deformation of the Self-Conjugate Nucleus ${}^{72}{Kr}$
journal, July 2005

Structure of even-even nuclei using a mapped collective Hamiltonian and the D1S Gogny interaction
journal, January 2010

Collectivity in A ∼ 70 nuclei studied via lifetime measurements in 70Br and 68,70Se
journal, June 2014

Neutron-proton correlations in an exactly solvable model
journal, April 1997

Proton-neutron pairing in $Z = N$ nuclei with $A = 76 - 96$
journal, June 1999

Competition of isoscalar and isovector proton-neutron pairing in nuclei
journal, May 1999

Enhancement of high-spin collectivity in N=Z nuclei by the isoscalar neutron–proton pairing
journal, January 2017

Lifetime effects for high-resolution gamma-ray spectroscopy at relativistic energies and their implications for the RISING spectrometer
journal, February 2010

Gamma radiation from the N=Z nucleus ${}_{40}^{80}$ ${Zr}_{40}$
journal, September 1987

Overview of neutron–proton pairing
journal, September 2014

Observation of mutually enhanced collectivity in self-conjugate $_{38}^{76}$ Sr $_{38}$
journal, April 2012

Evidence for a spin-aligned neutron–proton paired phase from the level structure of 92Pd
journal, December 2010

Nilsson-SU3 self-consistency in heavy $N = Z$ nuclei
journal, August 2015

Lifetime measurement of the $2_{1}^{+}$ state in 74Rb and isospin properties of quadrupole transition strengths at N = Z
journal, December 2018