N. L. Achouri

Laboratoire de Physique Corpusculaire de Caen

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N. A. Orr

École Nationale Supérieure d'Ingénieurs de Caen

J. Gibelin

Université de Caen Normandie

F. Delaunay

École Nationale Supérieure d'Ingénieurs de Caen

H. Baba

The University of Tokyo

T. Aumann

Technical University of Darmstadt

H. Otsu

RIKEN Nishina Center

Y. Kondo

Tokyo Institute of Technology

T. Isobe

RIKEN

T. Nakamura

Tohoku University

O. Sorlin

Centre National de la Recherche Scientifique

Cooperative Institutions

Centre National de la Recherche Scientifique

377

Institut National de Physique Nucléaire et de Physique des Particules

322

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

267

Université Paris-Saclay

RIKEN Nishina Center

GANIL

CEA Paris-Saclay

GSI Helmholtz Centre for Heavy Ion Research

117

Institut de Recherche sur les Lois Fondamentales de l'Univers

105

Université Paris-Sud

101

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Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne

Physics Letters B (2023)

H. Wang Masami Yasuda Y. Kondo T. Nakamura J. A. Tostevin

Detailed $\gamma$-ray spectroscopy of the exotic neon isotope $^{28}$Ne has been performed for the first time using the one-neutron removal reaction from $^{29}$Ne on a liquid hydrogen target at 240~MeV/nucleon. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for $^{28}$Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder $p$-wave strength providing evidence of the breakdown of the $N=20$ and $N=28$ shell gaps. Only a weak, possible $f$-wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large $p$-wave and small $f$-wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.

Parity (physics)

10.1016/j.physletb.2023.138038

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Citations (3)

Signature of a possible $$\alpha $$-cluster state in $$N=Z$$ doubly-magic $$^{56}$$Ni

The European Physical Journal A (2020)

S. Bagchi H. Akimune J. Gibelin M.N. Harakeh N. Kalantar‐Nayestanaki

Multiplicity (mathematics)

Alpha particle

Alpha decay

10.1140/epja/s10050-020-00294-7

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Citations (0)

Publisher’s Note: Measurement of the Isoscalar Monopole Rsponse in the Neutron-Rich NucleusNi68[Phys. Rev. Lett. 113, 032504 (2014)]

Physical Review Letters (2014)

M. Vandebrouck J. Gibelin E. Khan N. L. Achouri H. Baba

Isoscalar

10.1103/physrevlett.113.059902

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Halo Structure of the Neutron-Dripline Nucleus B19

Physical Review Letters (2020)

K. J. Cook T. Nakamura Y. Kondo K. Hagino Kazuyuki Ogata

The heaviest bound isotope of boron ^{19}B has been investigated using exclusive measurements of its Coulomb dissociation, into ^{17}B and two neutrons, in collisions with Pb at 220 MeV/nucleon. Enhanced electric dipole (E1) strength is observed just above the two-neutron decay threshold with an integrated E1 strength of B(E1)=1.64±0.06(stat)±0.12(sys) e^{2} fm^{2} for relative energies below 6 MeV. This feature, known as a soft E1 excitation, provides the first firm evidence that ^{19}B has a prominent two-neutron halo. Three-body calculations that reproduce the energy spectrum indicate that the valence neutrons have a significant s-wave configuration and exhibit a dineutronlike correlation.

10.1103/physrevlett.124.212503

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Citations (51)

Interaction cross section study of the two-neutron halo nucleus 22 C

Physics Letters B (2016)

Y. Togano T. Nakamura Y. Kondo J. A. Tostevin Akira Saito

The interaction cross sections (σI) of the very neutron-rich carbon isotopes 19C, 20C and 22C have been measured on a carbon target at 307, 280, and 235 MeV/nucleon, respectively. A σI of 1.280±0.023 b was obtained for 22C, significantly larger than for 19,20C, supporting the halo character of 22C. A 22C root-mean-squared matter radius of 3.44±0.08 fm was deduced using a four-body Glauber reaction model. This value is smaller than an earlier estimate (of 5.4±0.9 fm) derived from a σI measurement on a hydrogen target at 40 MeV/nucleon. These new, higher-precision σI data provide stronger constraints for assessing the consistency of theories describing weakly bound nuclei.

Glauber

10.1016/j.physletb.2016.08.062

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Citations (93)

First Observation of B20 and B<…

Physical Review Letters (2018)

S. Leblond F.M. Marqués J. Gibelin N. A. Orr Y. Kondo

The most neutron-rich boron isotopes $^{20}\mathrm{B}$ and $^{21}\mathrm{B}$ have been observed for the first time following proton removal from $^{22}\mathrm{N}$ and $^{22}\mathrm{C}$ at energies around $230\text{ }\text{ }\mathrm{MeV}/\mathrm{nucleon}$. Both nuclei were found to exist as resonances which were detected through their decay into $^{19}\mathrm{B}$ and one or two neutrons. Two-proton removal from $^{22}\mathrm{N}$ populated a prominent resonancelike structure in $^{20}\mathrm{B}$ at around 2.5 MeV above the one-neutron decay threshold, which is interpreted as arising from the closely spaced ${1}^{\ensuremath{-}},{2}^{\ensuremath{-}}$ ground-state doublet predicted by the shell model. In the case of proton removal from $^{22}\mathrm{C}$, the $^{19}\mathrm{B}$ plus one- and two-neutron channels were consistent with the population of a resonance in $^{21}\mathrm{B}$ $2.47\ifmmode\pm\else\textpm\fi{}0.19\text{ }\text{ }\mathrm{MeV}$ above the two-neutron decay threshold, which is found to exhibit direct two-neutron decay. The ground-state mass excesses determined for $^{20,21}\mathrm{B}$ are found to be in agreement with mass surface extrapolations derived within the latest atomic-mass evaluations.

10.1103/physrevlett.121.262502

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Citations (32)

Investigating Single-Particle Structure in ²⁶Na Using the New SHARC Array

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014) (2015)

G. L. Wilson W. N. Catford C. Aa. Diget N. A. Orr A. Matta

Particle (ecology)

10.7566/jpscp.6.020004

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Citations (1)

Study of ¹⁹C by One-Neutron Knockout from ²⁰C

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014) (2015)

Jongwon Hwang Sunji Kim Y. Satou N. A. Orr T. Nakamura

The present work aims at exploring neutron-unbound states of 19C via the one-neutron knockout reaction. The invariant mass measurement in inverse kinematics was carried out with a carbon target and a 20C secondary beam at 290 MeV/nucleon. The preliminary relative energy spectrum and the parallel momentum distribution of the system of 18C + n were reconstructed from the measured momenta of the 18C fragment and decayed neutron. A new resonance was observed at Erel = 2.3 MeV, which corresponds to the unbound state of 19C at Ex = 2.9 MeV. The parallel momentum distribution for this resonance suggests a spin-parity assignment of 1/2−. Additionally, two known states were seen at Ex = 0.6 and 1.4 MeV, consistent with the 5/2+1 and 5/2+2 states, respectively.

10.7566/jpscp.6.030032

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Citations (0)

Migration of Nuclear Shell Gaps Studied in thed(Ne24,pγ)Ne25Reaction

Physical Review Letters (2010)

W. N. Catford C. Timis R. C. Lemmon M. Labiche N. A. Orr

The transfer of neutrons onto Ne24 has been measured using a reaccelerated radioactive beam of Ne24 to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in Ne25 and its significance in terms of the migration of the neutron magic number from N=20 to N=16 is put on a firm footing by confirmation of this state’s identity. The raised 3/2+ level is observed simultaneously with the intruder negative parity 7/2− and 3/2− levels, providing evidence for the reduction in the N=20 gap. The coincident gamma-ray decays allowed the assignment of spins as well as the transferred orbital angular momentum. The excitation energy of the 3/2+ state shows that the established USD shell model breaks down well within the sd model space and requires a revised treatment of the proton-neutron monopole interaction.Received 22 September 2009DOI:https://doi.org/10.1103/PhysRevLett.104.192501©2010 American Physical Society

10.1103/physrevlett.104.192501

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Citations (42)

Comment on “First Observation of Ground State Dineutron Decay:Be16”

Physical Review Letters (2012)

F. M. Marqués N. A. Orr N. L. Achouri F. Delaunay J. Gibelin

A Comment on the Letter by A. Spyrou et al. Phys. Rev. Lett. 108, 102501 (2012). The authors of the Letter offer a Reply.Received 26 April 2012DOI:https://doi.org/10.1103/PhysRevLett.109.239201© 2012 American Physical Society

10.1103/physrevlett.109.239201

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Citations (29)