Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27

Loelius, C.; Kobayashi, N.; Iwasaki, H.; Bazin, D.; Belarge, J.; Bender, P. C.; Brown, B. A.; Elder, R.; Elman, B.; Gade, A.; Grinder, M.; Heil, S.; Hufnagel, A.; Longfellow, B.; Lunderberg, E.; Mathy, M.; Otsuka, T.; Petri, M.; Syndikus, I.; Tsunoda, N.; Weisshaar, D.; Whitmore, K.

doi:10.1103/PhysRevLett.121.262501

Title: Enhanced Electric Dipole Strength for the Weakly Bound States in ${}^{27}{Ne}$

Abstract

In this paper, an enhanced low-energy electric dipole (E1) strength is identified for the weakly bound excited states of the neutron-rich isotope ²⁷Ne. The Doppler-shift lifetime measurements employing a combination of the γ-ray tracking array GRETINA, the plunger device, and the S800 spectrograph determine the lower limit of 0.030 e² fm² or 0.052 W.u. for the 1/2⁺ → 3/2^– E1 transition in ²⁷Ne, representing one of the strongest E1 strengths observed among the bound discrete states in this mass region. This value is at least 30 times larger than that measured for the 3/2^– decay to the 3/2⁺_gs ground state. A comparison of the present results to large-scale shell-model calculations points to an important role of core excitations and deformation in the observed E1 enhancement, suggesting a novel example of the electric dipole modes manifested in weakly bound deformed systems.

Authors:

Loelius, C. ^[1]; Kobayashi, N. ^[2]; Iwasaki, H. ^[1]; Bazin, D. ^[1]; Belarge, J. ^[1]; Bender, P. C. ^[3]; Brown, B. A. ^[1]; Elder, R. ^[1]; Elman, B. ^[1]; Gade, A. ^[1]; Grinder, M. ^[1]; Heil, S. ^[4]; Hufnagel, A. ^[4]; Longfellow, B. ^[1]; Lunderberg, E. ^[1]; Mathy, M. ^[4]; Otsuka, T. ^[5]; Petri, M. ^[6]; Syndikus, I. ^[4]; Tsunoda, N. ^[7] more »

Michigan State Univ., East Lansing, MI (United States)
Michigan State Univ., East Lansing, MI (United States); Osaka Univ., Osaka (Japan)
Michigan State Univ., East Lansing, MI (United States); Univ. of Massachusetts, Lowell, MA (United States)
Technische Univ. Darmstadt, Darmstadt (Germany)
Michigan State Univ., East Lansing, MI (United States); Univ. of Tokyo, Tokyo (Japan); RIKEN Nishina Center, Saitama (Japan)
Technische Univ. Darmstadt, Darmstadt (Germany); Univ. of York, York (United Kingdom)
Univ. of Tokyo, Tokyo (Japan)

Publication Date:: Fri Dec 28 00:00:00 EST 2018

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); USDOE Office of Science (SC), Nuclear Physics (NP)

OSTI Identifier:: 1490972

Alternate Identifier(s):: OSTI ID: 1489082; OSTI ID: 1524942

Grant/Contract Number:: NA0003180; NA0000979; SC0014537

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 121; Journal Issue: 26; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Loelius, C., Kobayashi, N., Iwasaki, H., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Elder, R., Elman, B., Gade, A., Grinder, M., Heil, S., Hufnagel, A., Longfellow, B., Lunderberg, E., Mathy, M., Otsuka, T., Petri, M., Syndikus, I., Tsunoda, N., Weisshaar, D., and Whitmore, K. Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevLett.121.262501.

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                    Loelius, C., Kobayashi, N., Iwasaki, H., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Elder, R., Elman, B., Gade, A., Grinder, M., Heil, S., Hufnagel, A., Longfellow, B., Lunderberg, E., Mathy, M., Otsuka, T., Petri, M., Syndikus, I., Tsunoda, N., Weisshaar, D., & Whitmore, K. Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27.  United States.  https://doi.org/10.1103/PhysRevLett.121.262501

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                    Loelius, C., Kobayashi, N., Iwasaki, H., Bazin, D., Belarge, J., Bender, P. C., Brown, B. A., Elder, R., Elman, B., Gade, A., Grinder, M., Heil, S., Hufnagel, A., Longfellow, B., Lunderberg, E., Mathy, M., Otsuka, T., Petri, M., Syndikus, I., Tsunoda, N., Weisshaar, D., and Whitmore, K. Fri .  
"Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27".  United States.  https://doi.org/10.1103/PhysRevLett.121.262501.  https://www.osti.gov/servlets/purl/1490972.

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@article{osti_1490972,

  title        = {Enhanced Electric Dipole Strength for the Weakly Bound States in Ne27},

  author       = {Loelius, C. and Kobayashi, N. and Iwasaki, H. and Bazin, D. and Belarge, J. and Bender, P. C. and Brown, B. A. and Elder, R. and Elman, B. and Gade, A. and Grinder, M. and Heil, S. and Hufnagel, A. and Longfellow, B. and Lunderberg, E. and Mathy, M. and Otsuka, T. and Petri, M. and Syndikus, I. and Tsunoda, N. and Weisshaar, D. and Whitmore, K.},

  abstractNote = {In this paper, an enhanced low-energy electric dipole (E1) strength is identified for the weakly bound excited states of the neutron-rich isotope 27Ne. The Doppler-shift lifetime measurements employing a combination of the γ-ray tracking array GRETINA, the plunger device, and the S800 spectrograph determine the lower limit of 0.030 e2 fm2 or 0.052 W.u. for the 1/2+ → 3/2– E1 transition in 27Ne, representing one of the strongest E1 strengths observed among the bound discrete states in this mass region. This value is at least 30 times larger than that measured for the 3/2– decay to the 3/2+gs ground state. A comparison of the present results to large-scale shell-model calculations points to an important role of core excitations and deformation in the observed E1 enhancement, suggesting a novel example of the electric dipole modes manifested in weakly bound deformed systems.},

  doi          = {10.1103/PhysRevLett.121.262501},

  journal      = {Physical Review Letters},

  number       = 26,

  volume       = 121,

  place        = {United States},

  year         = {Fri Dec 28 00:00:00 EST 2018},

  month        = {Fri Dec 28 00:00:00 EST 2018}

}

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Works referencing / citing this record:

Enhanced $E 1$ transition between weakly-bound excited states in the nucleus ${}^{27}{Ne}$
journal, July 2019

Hamamoto, Ikuko
Physical Review C, Vol. 100, Issue 1
DOI: 10.1103/physrevc.100.014324

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Title: Enhanced Electric Dipole Strength for the Weakly Bound States in Ne 27

Abstract

Citation Formats

Quadrupole collectivity of 28Ne and the boundary of the island of inversion journal, August 2005

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

One-neutron removal from Ne 29 : Defining the lower limits of the island of inversion journal, January 2016

Observation of a p -Wave One-Neutron Halo Configuration in Mg 37 journal, June 2014

Review of Particle Physics journal, October 2016

Strengths of gamma-ray transitions in A = 6–44 nuclei (III) journal, January 1979

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Re-examining the transition into the N = 20 island of inversion: Structure of 30 Mg journal, April 2018

The Neutron Halo of Extremely Neutron-Rich Nuclei journal, August 1987

Low-lying neutron f p -shell intruder states in 27 Ne journal, January 2012

Deformed nuclear halos journal, February 1997

Commissioning the A1900 projectile fragment separator journal, May 2003

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

The TRIple PLunger for EXotic beams TRIPLEX for excited-state lifetime measurement studies on rare isotopes journal, January 2016

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

Lifetime Measurements and Triple Coexisting Band Structure in S 43 journal, July 2018

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Deformation-Driven p -Wave Halos at the Drip Line: Ne 31 journal, April 2014

Dominance of low- ℓ component in weakly bound deformed single-neutron orbits journal, April 2004

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Properties of 12 Be and 11 Be in terms of single-particle motion in deformed potential journal, November 2007

The electric dipole response of exotic nuclei journal, January 2013

Strong E 1 transitions in Be 9 , Be 11 , and C 13 journal, August 1983

Single-particle and collective motion in unbound deformed Mg 39 journal, November 2016

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Developing the Recoil Distance Doppler-Shift technique towards a versatile tool for lifetime measurements of excited nuclear states journal, July 2012

Measurement of the B ( E 2 , 0 1 + → 2 1 + ) in the N = 16 nucleus Ne 26 journal, May 2007

Direct evidence for the onset of intruder configurations in neutron-rich Ne isotopes journal, September 2006

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

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Title: Enhanced Electric Dipole Strength for the Weakly Bound States in ${}^{27}{Ne}$

Quadrupole collectivity of 28Ne and the boundary of the island of inversion
journal, August 2005

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

One-neutron removal from ${}^{29}{Ne}$ : Defining the lower limits of the island of inversion
journal, January 2016

Observation of a $p$ -Wave One-Neutron Halo Configuration in ${}^{37}{Mg}$
journal, June 2014

Review of Particle Physics
journal, October 2016

Strengths of gamma-ray transitions in A = 6–44 nuclei (III)
journal, January 1979

Measurements of Interaction Cross Sections and Nuclear Radii in the Light $p$ -Shell Region
journal, December 1985

Re-examining the transition into the N = 20 island of inversion: Structure of 30 Mg
journal, April 2018

The Neutron Halo of Extremely Neutron-Rich Nuclei
journal, August 1987

Low-lying neutron $f p$ -shell intruder states in $^{27}$ Ne
journal, January 2012

Deformed nuclear halos
journal, February 1997

Commissioning the A1900 projectile fragment separator
journal, May 2003

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

The TRIple PLunger for EXotic beams TRIPLEX for excited-state lifetime measurement studies on rare isotopes
journal, January 2016

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

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

Lifetime Measurements and Triple Coexisting Band Structure in ${}^{43}S$
journal, July 2018

The S800 spectrograph
journal, May 2003

Deformation-Driven $p$ -Wave Halos at the Drip Line: ${}^{31}{Ne}$
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journal, April 2004

$sd$ -shell observables for the USDA and USDB Hamiltonians
journal, December 2008

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

Properties of ¹² Be and ¹¹ Be in terms of single-particle motion in deformed potential
journal, November 2007

The electric dipole response of exotic nuclei
journal, January 2013

Strong $E 1$ transitions in ${}^{9}{Be}$ , ${}^{11}{Be}$ , and ${}^{13}C$
journal, August 1983

Single-particle and collective motion in unbound deformed ${}^{39}{Mg}$
journal, November 2016

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

Developing the Recoil Distance Doppler-Shift technique towards a versatile tool for lifetime measurements of excited nuclear states
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Measurement of the $B (E 2, 0_{1}^{+} \to 2_{1}^{+})$ in the $N = 16$ nucleus ${}^{26}{Ne}$
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Direct evidence for the onset of intruder configurations in neutron-rich Ne isotopes
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Lifetime measurement of the $4_{1}^{+}$ state of ${}^{58}{Ni}$ with the recoil distance method
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Mass systematics for A =29–44 nuclei: The deformed A ∼32 region
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journal, September 1992

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