# Halo-induced large enhancement of soft dipole excitation of 11 Li observed via proton inelastic scattering

@article{Tanaka2017HaloinducedLE,
title={Halo-induced large enhancement of soft dipole excitation of 11 Li observed via proton inelastic scattering},
author={Junki Tanaka},
journal={Physics Letters B},
year={2017},
volume={774},
pages={268-272}
}
• J. Tanaka
• Published 25 August 2017
• Physics
• Physics Letters B
Abstract Proton inelastic scattering off a neutron halo nucleus, 11 Li, has been studied in inverse kinematics at the IRIS facility at TRIUMF. The aim was to establish a soft dipole resonance and to obtain its dipole strength. Using a high quality 66 MeV 11 Li beam, a strongly populated excited state in 11 Li was observed at E x = 0.80 ± 0.02 MeV with a width of Γ = 1.15 ± 0.06 MeV . A DWBA (distorted-wave Born approximation) analysis of the measured differential cross section with isoscalar… Expand
19 Citations

#### Figures from this paper

Proton inelastic scattering reveals deformation in 8He
• M. Holl, +27 authors M. Williams
• Physics
• Physics Letters B
• 2021
A measurement of proton inelastic scattering of He at 8.25A MeV at TRIUMF shows a resonance at 3.54(6) MeV with a width of 0.89(11) MeV. The energy of the state is in good agreement with coupledExpand
Soft giant resonance in two neutron halo nucleus 11Li
• Physics
• 2019
Abstract.Lithium-11 is a showcase of neutron halos and has been providing new insight to nuclear structure researches. Recently, an isoscalar resonance at low excitation energy ($E_\mathrm{x} \simExpand Three-body breakup of 6He and its halo structure Abstract The Borromean halo nucleus 6He has been studied by a kinematically complete measurement of Coulomb and nuclear breakup into α + 2n on Pb and C targets at 70 MeV/nucleon. FullyExpand Complete Glauber calculations for proton–nucleus inelastic cross sections • Physics • Nuclear Physics A • 2019 Abstract We perform a parameter-free calculation for the high-energy proton–nucleus scattering based on the Glauber theory. A complete evaluation of the so-called Glauber amplitude is made by usingExpand Pygmy resonances: what’s in a name? • Physics • Physica Scripta • 2019 The centroid, width and percentage of energy weighted sum rule of dipole resonances can be strongly affected by dynamical fluctuations and static deformations of the nuclear surface, deformations andExpand Low-energy dipole response of exotic nuclei Abstract.The electric dipole response of neutron-rich nuclei is discussed from an experimental perspective using selected examples. After introducing the main experimental method, which isExpand Impact of uncertainties of unbound 10Li on the ground state of two-neutron halo 11Li • Physics • 2019 Recently, the energy spectrum of$^{10}$Li was measured upto 4.6 MeV, via one-neutron transfer reaction d($^{9}$Li, p)$^{10}$Li. Considering the ambiguities on the$^{10}$Li continuum spectrum withExpand Borromean Feshbach resonance in$^{11}$Li studied via$^{11}$Li($p$,$p'\$)
• Physics
• 2017
A dipole resonance of 11Li is newly found by a 9Li + n + n three-body model analysis with the complex-scaling method. The resonance can be interpreted as a bound state in the 10Li + n system, thatExpand
First Observation of Unbound ^{11}O, the Mirror of the Halo Nucleus ^{11}Li.
• T. Webb, +23 authors K. Zhu
• Medicine, Physics
• Physical review letters
• 2019
The structure of the extremely proton-rich nucleus _{8}^{11}O_{3], the mirror of the two-neutron halo nucleus, has been studied experimentally for the first time and it was concluded that this peak is a multiplet with contributions from the four lowest ^{11]O resonant states. Expand
Reaction dynamics of exotic and stable weakly-bound nuclei using a four-body continuum-discretized coupled-channels formalism
• Physics
• EPJ Web of Conferences
• 2021
Reactions induced by four weakly-bound nuclei on a lead target, at energies around the Coulomb barrier, are described using the same four-body continuum-discretized coupled-channels formalism. TheExpand

#### References

SHOWING 1-10 OF 30 REFERENCES
Observation of strong low-lying E1 strength in the two-neutron halo nucleus 11Li.
An exclusive measurement has been made of the Coulomb dissociation of the two-neutron halo nucleus 11Li at 70 MeV/nucleon at RIKEN, where strong low-energy E1 excitation is observed, which represents the strongest E1 transition ever observed at such low excitation energies. Expand
Invariant-mass spectroscopy of 10Li and 11Li
Break-up of secondary Li-11 ion beams (280 MeV/nucleon) on C and Pb targets into Li-9 and neutrons is studied experimentally. Cross sections and neutron multiplicity distributions are obtained,Expand
Evidence of soft dipole resonance in ^{11}li with isoscalar character.
The first conclusive evidence of a dipole resonance in Li having isoscalar character observed from inelastic scattering with a novel solid deuteron target is reported, showing the first signature that the monopole tensor interaction is important in ^{11}Li. Expand
Coulomb dissociation of a halo nucleus 11Be at 72A MeV
Abstract We have measured the excitation energy spectrum of the 10 Be+n system in the Coulomb dissociation of the one-neutron-halo nucleus 11Be on a Pb target at 72A MeV. We have determined theExpand
ISOSCALAR DIPOLE RESONANCE - FORM-FACTOR AND ENERGY WEIGHTED SUM-RULE
• Physics
• 1981
A collective formalism first proposed by Deal to describe isoscalar dipole excitations in electron scattering is extended to include excitations of these modes by hadron scattering. Distorted-waveExpand
Electromagnetic dissociation of 11li and soft dipole mode
• Physics
• 1990
Abstract The electromagnetic dissociation in the (11Li, 9Li) projectile fragmentation has been studied using a formalism developed by Winther and Alder. Two types of excitations of 11Li contribute toExpand
Coulomb dissociation reaction and correlations of two halo neutrons in 11Li
Abstract We have performed an exclusive measurement for the Coulomb dissociation reaction, Pb( 11 Li, 9 Li+2n) X at an incident energy of 43 A MeV. The deduced excitation energy spectrum of the 11LiExpand
Isospin and macroscopic models for the excitation of giant resonances and other collective states
Abstract Recently there has been some confusion over the excitation of “isovector” giant resonances by isoscalar probes. We present a unified theoretical description of macroscopic models that may beExpand
Investigation of the ^{10}Li shell inversion by neutron continuum transfer reaction.
The comparison between data and theoretical predictions, including pairing correlation effects, shows the existence of a p_{1/2} resonance at 0.45±0.03  MeV excitation energy, while no evidence for a significant s-wave contribution close to the threshold energy is observed. Expand
Projectile fragmentation of exotic nuclear beams
Abstract Using the projectile fragmentation of exotic nuclear beams around 1 GeV/nucleon available at the LBL Bevalac, the nuclear structures of light nuclei near the neutron dripline have beenExpand