Two-Neutron Halo is Unveiled in F29

Bagchi, S.; Kanungo, R.; Tanaka, Y. K.; Geissel, H.; Doornenbal, P.; Horiuchi, W.; Hagen, G.; Suzuki, T.; Tsunoda, N.; Ahn, D. S.; Baba, H.; Behr, K.; Browne, F.; Chen, S.; Cortés, M. L.; Estradé, A.; Fukuda, N.; Holl, M.; Itahashi, K.; Itahashi, K.; Jansen, G. R.; Jiang, W. G.; Kaur, S.; Macchiavelli, A. O.; Matsumoto, S. Y.; Momiyama, S.; Murray, I.; Nakamura, T.; Novario, S. J.; Ong, H. J.; Otsuka, T.; Papenbrock, T.; Paschalis, S.; Prochazka, A.; Scheidenberger, C.; Schrock, P.; Shimizu, Y.; Steppenbeck, D.; Sakurai, H.; Suzuki, D.; Suzuki, H.; Takechi, M.; Takeda, H.; Takeuchi, S.; Taniuchi, R.; Wimmer, K.; Yoshida, K.

doi:10.1103/PhysRevLett.124.222504

Title: Two-Neutron Halo is Unveiled in ${}^{29}F$

Abstract

We report the measurement of reaction cross sections (σexR) of 27,29F with a carbon target at RIKEN. The unexpectedly large σexR and derived matter radius identify 29F as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the 2p3/2 orbital, thereby vanishing the shell closure associated with the neutron number N=20. The results are explained by state-of-the-art shell model calculations. Coupled-cluster computations based on effective field theories of the strong nuclear force describe the matter radius of 27F but are challenged for 29F.

Authors:

Bagchi, S. ^[1]; Kanungo, R. ^[2]; Tanaka, Y. K. ^[1]; Geissel, H. ^[3]; Doornenbal, P. ^[4]; Horiuchi, W. ^[5]; Hagen, G. ^[6]; Suzuki, T. ^[7]; Tsunoda, N. ^[8]; Ahn, D. S. ^[4]; Baba, H. ^[4]; Behr, K. ^[9]; Browne, F. ^[4]; Chen, S. ^[4]; Cortés, M. L. ^[4]; Estradé, A. ^[10]; Fukuda, N. ^[4]; Holl, M. ^[2]; Itahashi, K. ^[4]; Itahashi, K. ^[11] more »

Saint Mary’s Univ., Halifax, NS (Canada); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Univ. of Giessen (Germany)
Saint Mary’s Univ., Halifax, NS (Canada); TRIUMF, Vancouver, BC (Canada)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Univ. of Giessen (Germany)
RIKEN, Saitama (Japan)
Hokkaido Univ., Sapporo (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Nihon Univ., Tokyo (Japan)
Univ. of Tokyo (Japan)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
Central Michigan Univ., Mount Pleasant, MI (United States)
RIKEN, Saitama (Japan); Tohoku Univ., Sendai (Japan). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Saint Mary’s Univ., Halifax, NS (Canada); Dalhousie Univ., Halifax, NS (Canada)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Kyoto Univ. (Japan)
RIKEN, Saitama (Japan); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Tokyo Institute of Technology (Japan)
Osaka Univ. (Japan); Chinese Academy of Sciences (CAS), Lanzhou (China)
RIKEN, Saitama (Japan); Univ. of Tokyo (Japan)
Univ. of York (United Kingdom)
Niigata Univ. (Japan)
Univ. of Tokyo (Japan); Univ. of York (United Kingdom)

Publication Date:: Fri Jun 05 00:00:00 EDT 2020

Research Org.:: Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Org.:: RIKEN Collaboration

OSTI Identifier:: 1632004

Alternate Identifier(s):: OSTI ID: 1633145

Grant/Contract Number:: FG02-96ER40963; AC05-00OR22725; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 124; Journal Issue: 22; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Bagchi, S., Kanungo, R., Tanaka, Y. K., Geissel, H., Doornenbal, P., Horiuchi, W., Hagen, G., Suzuki, T., Tsunoda, N., Ahn, D. S., Baba, H., Behr, K., Browne, F., Chen, S., Cortés, M. L., Estradé, A., Fukuda, N., Holl, M., Itahashi, K., Itahashi, K., Jansen, G. R., Jiang, W. G., Kaur, S., Macchiavelli, A. O., Matsumoto, S. Y., Momiyama, S., Murray, I., Nakamura, T., Novario, S. J., Ong, H. J., Otsuka, T., Papenbrock, T., Paschalis, S., Prochazka, A., Scheidenberger, C., Schrock, P., Shimizu, Y., Steppenbeck, D., Sakurai, H., Suzuki, D., Suzuki, H., Takechi, M., Takeda, H., Takeuchi, S., Taniuchi, R., Wimmer, K., and Yoshida, K. Two-Neutron Halo is Unveiled in F29.  United States: N. p., 2020. 
Web.  doi:10.1103/PhysRevLett.124.222504.

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                    Bagchi, S., Kanungo, R., Tanaka, Y. K., Geissel, H., Doornenbal, P., Horiuchi, W., Hagen, G., Suzuki, T., Tsunoda, N., Ahn, D. S., Baba, H., Behr, K., Browne, F., Chen, S., Cortés, M. L., Estradé, A., Fukuda, N., Holl, M., Itahashi, K., Itahashi, K., Jansen, G. R., Jiang, W. G., Kaur, S., Macchiavelli, A. O., Matsumoto, S. Y., Momiyama, S., Murray, I., Nakamura, T., Novario, S. J., Ong, H. J., Otsuka, T., Papenbrock, T., Paschalis, S., Prochazka, A., Scheidenberger, C., Schrock, P., Shimizu, Y., Steppenbeck, D., Sakurai, H., Suzuki, D., Suzuki, H., Takechi, M., Takeda, H., Takeuchi, S., Taniuchi, R., Wimmer, K., & Yoshida, K. Two-Neutron Halo is Unveiled in F29.  United States.  https://doi.org/10.1103/PhysRevLett.124.222504

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                    Bagchi, S., Kanungo, R., Tanaka, Y. K., Geissel, H., Doornenbal, P., Horiuchi, W., Hagen, G., Suzuki, T., Tsunoda, N., Ahn, D. S., Baba, H., Behr, K., Browne, F., Chen, S., Cortés, M. L., Estradé, A., Fukuda, N., Holl, M., Itahashi, K., Itahashi, K., Jansen, G. R., Jiang, W. G., Kaur, S., Macchiavelli, A. O., Matsumoto, S. Y., Momiyama, S., Murray, I., Nakamura, T., Novario, S. J., Ong, H. J., Otsuka, T., Papenbrock, T., Paschalis, S., Prochazka, A., Scheidenberger, C., Schrock, P., Shimizu, Y., Steppenbeck, D., Sakurai, H., Suzuki, D., Suzuki, H., Takechi, M., Takeda, H., Takeuchi, S., Taniuchi, R., Wimmer, K., and Yoshida, K. Fri .  
"Two-Neutron Halo is Unveiled in F29".  United States.  https://doi.org/10.1103/PhysRevLett.124.222504.  https://www.osti.gov/servlets/purl/1632004.

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@article{osti_1632004,

  title        = {Two-Neutron Halo is Unveiled in F29},

  author       = {Bagchi, S. and Kanungo, R. and Tanaka, Y. K. and Geissel, H. and Doornenbal, P. and Horiuchi, W. and Hagen, G. and Suzuki, T. and Tsunoda, N. and Ahn, D. S. and Baba, H. and Behr, K. and Browne, F. and Chen, S. and Cortés, M. L. and Estradé, A. and Fukuda, N. and Holl, M. and Itahashi, K. and Itahashi, K. and Jansen, G. R. and Jiang, W. G. and Kaur, S. and Macchiavelli, A. O. and Matsumoto, S. Y. and Momiyama, S. and Murray, I. and Nakamura, T. and Novario, S. J. and Ong, H. J. and Otsuka, T. and Papenbrock, T. and Paschalis, S. and Prochazka, A. and Scheidenberger, C. and Schrock, P. and Shimizu, Y. and Steppenbeck, D. and Sakurai, H. and Suzuki, D. and Suzuki, H. and Takechi, M. and Takeda, H. and Takeuchi, S. and Taniuchi, R. and Wimmer, K. and Yoshida, K.},

  abstractNote = {We report the measurement of reaction cross sections (σexR) of 27,29F with a carbon target at RIKEN. The unexpectedly large σexR and derived matter radius identify 29F as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the 2p3/2 orbital, thereby vanishing the shell closure associated with the neutron number N=20. The results are explained by state-of-the-art shell model calculations. Coupled-cluster computations based on effective field theories of the strong nuclear force describe the matter radius of 27F but are challenged for 29F.},

  doi          = {10.1103/PhysRevLett.124.222504},

  journal      = {Physical Review Letters},

  number       = 22,

  volume       = 124,

  place        = {United States},

  year         = {Fri Jun 05 00:00:00 EDT 2020},

  month        = {Fri Jun 05 00:00:00 EDT 2020}

}

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DOI: 10.1007/BF01119617

Effective interaction in non-degenerate model space
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Takayanagi, Kazuo
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DOI: 10.1016/j.nuclphysa.2011.01.003

Exploring the Low- $Z$ Shore of the Island of Inversion at $N = 19$
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Tripathi, Vandana; Tabor, S. L.; Mantica, P. F.
Physical Review Letters, Vol. 94, Issue 16
DOI: 10.1103/PhysRevLett.94.162501

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Title: Two-Neutron Halo is Unveiled in F 29

Abstract

Citation Formats

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

Borromean Halo Nuclei journal, January 2000

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

First Exploration of Neutron Shell Structure below Lead and beyond N = 126 journal, February 2020

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

Effective field theory of nuclear forces journal, January 1999

Reaction cross sections of carbon isotopes incident on a proton journal, March 2008

Natural orbitals for ab initio no-core shell model calculations journal, March 2019

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

Nuclear size and related topics journal, October 2001

Pion Theory of Three-Body Forces journal, March 1957

Evolution of Nuclear Shells due to the Tensor Force journal, November 2005

The AME2016 atomic mass evaluation (II). Tables, graphs and references journal, March 2017

Proton Distribution Radii of C 12 – 19 Illuminate Features of Neutron Halos journal, September 2016

Examining possible neutron-halo nuclei heavier than Mg 37 journal, April 2017

Systematic analysis of reaction cross sections of carbon isotopes journal, April 2007

Interaction cross section study of the two-neutron halo nucleus 22 C journal, October 2016

Convergence of effective hamiltonian expansion and partial summations of folded diagrams journal, December 1974

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

Towards necessary and sufficient conditions for halo occurrence journal, May 2000

Direct Mass Measurements of B 19 , C 22 , F 29 , Ne 31 , Na 34 and Other Light Exotic Nuclei journal, November 2012

Microscopic Calculation of the Inclusive Electron Scattering Structure Function in O 16 journal, February 2000

Many-fermion theory in expS- (or coupled cluster) form journal, February 1978

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

Projectile fragmentation of 112 Sn at E lab = 1 A GeV journal, May 2002

Efimov Physics Around the Neutron-Rich Ca 60 Isotope journal, September 2013

Accurate charge-dependent nucleon-nucleon potential at fourth order of chiral perturbation theory journal, October 2003

Coupled-cluster computations of atomic nuclei journal, September 2014

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

Table of experimental nuclear ground state charge radii: An update journal, January 2013

New Magic Number, N = 16 , near the Neutron Drip Line journal, June 2000

Coupled-cluster theory in quantum chemistry journal, February 2007

Spectroscopy of Ne 32 and the “Island of Inversion” journal, July 2009

Ab initio calculation of the potential bubble nucleus Si 34 journal, March 2017

Short-range correlations in nuclear wave functions journal, June 1960

On the "Magic Numbers" in Nuclear Structure journal, June 1949

Neutron capture rates in the r-process - The role of direct radiative capture journal, July 1983

Two-neutron halo structure of F 31 and a novel pairing antihalo effect journal, April 2020

Structure of 29 F in the rotation-aligned coupling scheme of the particle-rotor model journal, December 2017

Evolution of shell structure in exotic nuclei journal, March 2020

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

Chiral effective field theory and nuclear forces journal, June 2011

Nuclear Configurations in the Spin-Orbit Coupling Model. I. Empirical Evidence journal, April 1950

Development of Parallel Plate Avalanche Counter (PPAC) for BigRIPS fragment separator journal, December 2013

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

Neutron and weak-charge distributions of the 48Ca nucleus journal, November 2015

DALI2: A NaI(Tl) detector array for measurements of γ rays from fast nuclei journal, November 2014

Statistical uncertainties of a chiral interaction at next-to-next-to leading order journal, February 2015

Modern theory of nuclear forces journal, December 2009

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

Measurement of the Two-Halo Neutron Transfer Reaction H 1 ( Li 11 , Li 9 ) H 3 at 3 A MeV journal, May 2008

Δ isobars and nuclear saturation journal, February 2018

Intruder configurations in the ground state of 30 Ne journal, April 2017

Interaction cross sections for Ne isotopes towards the island of inversion and halo structures of 29Ne and 31Ne journal, February 2012

Ab initio no-core solutions for 6 Li journal, May 2017

Ordering of the 0 d 5 / 2 and 1 s 1 / 2 proton levels in light nuclei journal, August 2016

Multi-shell effective interactions journal, February 2014

Coherent elastic neutrino-nucleus scattering on Ar 40 from first principles journal, December 2019

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

Neutron s states in loosely bound nuclei journal, June 2014

Direct Experimental Evidence for Strong Admixture of Different Parity States in 11 Li journal, July 1999

D IRECT R EACTIONS WITH E XOTIC N UCLEI journal, December 2003

Utility of nucleon-target profile function in cross section calculations journal, April 2000

Probing the weakly-bound neutron orbit of Ne 31 with total reaction and one-neutron removal cross sections journal, February 2010

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A coupled cluster approach with triple excitations journal, December 1984

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An overview of coupled cluster theory and its applications in physics journal, January 1991

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Low- Z shore of the “island of inversion” and the reduced neutron magicity toward O 28 journal, April 2017

BigRIPS separator and ZeroDegree spectrometer at RIKEN RI Beam Factory journal, January 2012

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Title: Two-Neutron Halo is Unveiled in ${}^{29}F$

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

Borromean Halo Nuclei
journal, January 2000

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

First Exploration of Neutron Shell Structure below Lead and beyond $N = 126$
journal, February 2020

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

Effective field theory of nuclear forces
journal, January 1999

Reaction cross sections of carbon isotopes incident on a proton
journal, March 2008

Natural orbitals for ab initio no-core shell model calculations
journal, March 2019

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

Nuclear size and related topics
journal, October 2001

Pion Theory of Three-Body Forces
journal, March 1957

Evolution of Nuclear Shells due to the Tensor Force
journal, November 2005

The AME2016 atomic mass evaluation (II). Tables, graphs and references
journal, March 2017

Proton Distribution Radii of ${}^{12 - 19}C$ Illuminate Features of Neutron Halos
journal, September 2016

Examining possible neutron-halo nuclei heavier than ${}^{37}{Mg}$
journal, April 2017

Systematic analysis of reaction cross sections of carbon isotopes
journal, April 2007

Interaction cross section study of the two-neutron halo nucleus 22 C
journal, October 2016

Convergence of effective hamiltonian expansion and partial summations of folded diagrams
journal, December 1974

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

Towards necessary and sufficient conditions for halo occurrence
journal, May 2000

Direct Mass Measurements of ${}^{19}B$ , ${}^{22}C$ , ${}^{29}F$ , ${}^{31}{Ne}$ , ${}^{34}{Na}$ and Other Light Exotic Nuclei
journal, November 2012

Microscopic Calculation of the Inclusive Electron Scattering Structure Function in ${}^{16}O$
journal, February 2000

Many-fermion theory in expS- (or coupled cluster) form
journal, February 1978

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

Projectile fragmentation of $^{112} Sn$ at $E_{lab} = 1 A GeV$
journal, May 2002

Efimov Physics Around the Neutron-Rich ${}^{60}{Ca}$ Isotope
journal, September 2013

Accurate charge-dependent nucleon-nucleon potential at fourth order of chiral perturbation theory
journal, October 2003

Coupled-cluster computations of atomic nuclei
journal, September 2014

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

Table of experimental nuclear ground state charge radii: An update
journal, January 2013

New Magic Number, $N = 16$ , near the Neutron Drip Line
journal, June 2000

Coupled-cluster theory in quantum chemistry
journal, February 2007

Spectroscopy of ${}^{32}{Ne}$ and the “Island of Inversion”
journal, July 2009

Ab initio calculation of the potential bubble nucleus ${}^{34}{Si}$
journal, March 2017

Short-range correlations in nuclear wave functions
journal, June 1960

On the "Magic Numbers" in Nuclear Structure
journal, June 1949

Neutron capture rates in the r-process - The role of direct radiative capture
journal, July 1983

Two-neutron halo structure of ${}^{31}F$ and a novel pairing antihalo effect
journal, April 2020

Structure of 29 F in the rotation-aligned coupling scheme of the particle-rotor model
journal, December 2017

Evolution of shell structure in exotic nuclei
journal, March 2020

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

Chiral effective field theory and nuclear forces
journal, June 2011

Nuclear Configurations in the Spin-Orbit Coupling Model. I. Empirical Evidence
journal, April 1950

Development of Parallel Plate Avalanche Counter (PPAC) for BigRIPS fragment separator
journal, December 2013

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

Neutron and weak-charge distributions of the 48Ca nucleus
journal, November 2015

DALI2: A NaI(Tl) detector array for measurements of γ rays from fast nuclei
journal, November 2014

Statistical uncertainties of a chiral interaction at next-to-next-to leading order
journal, February 2015

Modern theory of nuclear forces
journal, December 2009

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

Measurement of the Two-Halo Neutron Transfer Reaction ${}^{1}H ({}^{11}{Li}, {}^{9}{Li}) {}^{3}H$ at $3 A MeV$
journal, May 2008

$Δ$ isobars and nuclear saturation
journal, February 2018

Intruder configurations in the ground state of 30 Ne
journal, April 2017

Interaction cross sections for Ne isotopes towards the island of inversion and halo structures of 29Ne and 31Ne
journal, February 2012

Ab initio no-core solutions for ⁶ Li
journal, May 2017

Ordering of the $0 d_{5 / 2}$ and $1 s_{1 / 2}$ proton levels in light nuclei
journal, August 2016

Multi-shell effective interactions
journal, February 2014

Coherent elastic neutrino-nucleus scattering on Ar 40 from first principles
journal, December 2019

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

Neutron $s$ states in loosely bound nuclei
journal, June 2014

Direct Experimental Evidence for Strong Admixture of Different Parity States in $^{11} Li$
journal, July 1999

D IRECT R EACTIONS WITH E XOTIC N UCLEI
journal, December 2003

Utility of nucleon-target profile function in cross section calculations
journal, April 2000

Probing the weakly-bound neutron orbit of ${}^{31}{Ne}$ with total reaction and one-neutron removal cross sections
journal, February 2010

Effective Hamiltonian in the extended Krenciglowa–Kuo method
journal, August 2011

Measurement of the Spin and Magnetic Moment of ${}^{31}{M g}$ : Evidence for a Strongly Deformed Intruder Ground State
journal, January 2005

A coupled cluster approach with triple excitations
journal, December 1984

Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect
journal, November 2012

An overview of coupled cluster theory and its applications in physics
journal, January 1991

Effective interaction in non-degenerate model space
journal, February 2011

Exploring the Low- $Z$ Shore of the Island of Inversion at $N = 19$
journal, January 2012

Low- $Z$ shore of the “island of inversion” and the reduced neutron magicity toward ${}^{28}O$
journal, April 2017

BigRIPS separator and ZeroDegree spectrometer at RIKEN RI Beam Factory
journal, January 2012

${}^{29}{Na}$ : Defining the Edge of the Island of Inversion for $Z = 11$
journal, April 2005