Evidence of Soft Dipole Resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Li</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>with Isoscalar Character

Kanungo, R.; Sanetullaev, A.; Tanaka, J.; Ishimoto, S.; Hagen, G.; Myo, Takayuki; Suzuki, Toshio; Andreoiu, C.; Bender, P. C.; Chen, A. A.; Davids, B.; Fallis, J.; Fortin, Jean‐Paul; Galinski, N.; Gallant, A. T.; Garrett, P. E.; Hackman, G.; Hadinia, B.; Jansen, G. R.; Keefe, M.; Krücken, R.; Lighthall, J. C.; McNeice, E.; Miller, D.; Otsuka, T.; Purcell, J.E.; Randhawa, J. S.; Roger, T.; Rojas, A.; Savajols, H.; Shotter, A.C.; Tanihata, I.; Thompson, I. J.; Unsworth, C.; Voss, P.; Wang, Z.

doi:10.1103/physrevlett.114.192502

Cited by 64 publications

(110 citation statements)

References 33 publications

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“…Furthermore, in weakly-bound nuclei along the driplines, it has been speculated that there exist resonances called soft dipole resonances [11], a dipole mode where loosely-bound nucleons oscillate against a core. The soft resonances can occur at even lower energies, attracting much interest in both theory [12][13][14] and experiments [15][16][17]. A soft dipole resonance has been observed in the halo nucleus 11 Li at an excitation energy of only 1.03 MeV [16].…”

Section: Introductionmentioning

confidence: 99%

“…The soft resonances can occur at even lower energies, attracting much interest in both theory [12][13][14] and experiments [15][16][17]. A soft dipole resonance has been observed in the halo nucleus 11 Li at an excitation energy of only 1.03 MeV [16]. Low-energy monopole and quadrupole resonances have also been observed in neutron-rich nuclei (see e.g.…”

Section: Introductionmentioning

confidence: 99%

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Chiral NNLOsat descriptions of nuclear multipole resonances within the random-phase approximation

Fang

et al. 2018

Phys. Rev. C

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We study nuclear multipole resonances in the framework of the random phase approximation using the chiral potential NNLO sat . This potential includes two-and three-body terms that has been simultaneously optimized to low-energy nucleon-nucleon scattering data and selected nuclear structure data. Our main foci have been the isoscalar monopole, isovector dipole, and isoscalar quadrupole resonances of the closed-shell nuclei, 4 He, 16,22,24 O, and 40,48 Ca. These resonance modes have been widely observed in experiment. In addition, we use a renormalized chiral potential V low-k , based on the N 3 LO two-body potential by Entem and Machleidt [Phys. Rev. C68, 041001 (2011)]. This introduces a dependency on the cutoff parameter used in the normalization procedure as reported in previous works by other groups. While NNLO sat can reasonably reproduce observed multipole resonances, it is not possible to find a single cutoff parameter for the V low-k potential that simultaneously describe the different types of resonance modes. The sensitivity to the cutoff parameter can be explained by missing induced three-body forces in the calculations. Our results for neutron-rich 22,24 O show a mixing nature of isoscalar and isovector resonances in the dipole channel at low energies. We predict that 22 O and 24 O have low-energy isoscalar quadrupole resonances at energies lower than 5 MeV.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chiral NNLOsat descriptions of nuclear multipole resonances within the random-phase approximation

Fang

et al. 2018

Phys. Rev. C

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“…The nuclei belong to the category of open quantum systems in which the coupling to the particle continuum profoundly affects the behavior of the system [1, 2]. Many novel phenomena have been observed or predicted in the exotic nuclei, such as halos [3, 4], genuine intrinsic resonances [5, 6] and new collective modes [7,8]. To include the continuum effect, several models have been developed, e.g., the continuum shell model (CSM) [1,9,10], the Gamow shell model [5, 6], the complex coupled cluster (CC) [11,12] and the continuumcoupled shell model [13].Current nuclear theory is pursuing ab initio calculations which are based on realistic nuclear forces and rigorous many-body methods.…”

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confidence: 99%

Ab initio Gamow in-medium similarity renormalization group with resonance and continuum

Sun

et al. 2019

Phys. Rev. C

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We have developed a novel ab initio Gamow in-medium similarity renormalization group (Gamow IMSRG) in the complex-energy Berggren framework. The advanced Gamow IMSRG is capable of describing the resonance and nonresonant continuum properties of weakly-bound and unbound nuclear many-body systems. As test grounds, carbon and oxygen isotopes have been calculated with chiral two-and three-nucleon forces from the effective field theory. Resonant states observed in the neutron-dripline 24 O are well reproduced. The halo structure of the known heaviest Borromean nucleus 22 C is clearly seen by calculating the density distribution, in which continuum s-channel plays a crucial role. Further, we predict low-lying resonant excited states in 22 C. The Gamow IMSRG provides tractable ab initio calculations of weakly-bound and unbound open quantum systems. * frxu@pku.edu.cnIntroduction.− Thanks to advanced radioactive beam facilities, loosely-bound and unbound nuclei with extreme neutron-to-proton ratios have been explored in an unprecedented way. The nuclei belong to the category of open quantum systems in which the coupling to the particle continuum profoundly affects the behavior of the system [1, 2]. Many novel phenomena have been observed or predicted in the exotic nuclei, such as halos [3, 4], genuine intrinsic resonances [5, 6] and new collective modes [7,8]. To include the continuum effect, several models have been developed, e.g., the continuum shell model (CSM) [1,9,10], the Gamow shell model [5, 6], the complex coupled cluster (CC) [11,12] and the continuumcoupled shell model [13].Current nuclear theory is pursuing ab initio calculations which are based on realistic nuclear forces and rigorous many-body methods. However, it is always a big challenge to develop an ab initio method to efficiently describe the continuum. As one of powerful ab initio renormalizations of interacting Hamiltonians, similarity renormalization group (SRG) was proposed independently by G lazek and Wilson [14] and by Wegner [15]. Later, Bogner et al. [16, 17] applied the SRG method to softening nuclear forces for ab initio calculations. Recently, the SRG method was developed as a new many-body method in nuclear configuration space, named in-medium SRG (IMSRG) [18, 19]. The IMSRG can directly give the ground-state properties of closed-shell nuclei [18], and as well be used to derive non-perturbative effective Hamiltonians for the descriptions of excited states or open-shell nuclei [20,21]. The IMSRG has been developed further, including multi-reference IMSRG [22], IMSRG using an ensemble reference [23], equation-of-motion IMSRG (EOM-IMSRG) [24,25] and IMSRG merging no-core shell model [26]. The IMSRG has become a powerful and predictive ab initio method. However, all the existing IMSRG calculations are performed in the harmonic oscillator (HO) or real-energy Hartree-Fock (HF) basis (here the real-energy HF means that the HF approach is performed in the HO basis). The HO basis is bound and localized, and hence isolated from the environment of un...

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“…Moreover, the three-body model of 11 Li used in these CDCC calculations predicts the existence of a low-lying dipole resonance, which has been recently observed in Ref. [26]. In order to correctly reproduce the magnitude of the experimental breakup cross sections, this resonance needed to be placed very close to the threshold [23].…”

Section: Introductionmentioning

confidence: 88%

Simultaneous analysis of the elastic scattering and breakup channel for the reactionLi11+Pb208at energies near the Coulomb barrier

et al. 2015

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We present a detailed analysis of the elastic scattering and breakup channel for the reaction of 11 Li on 208 Pb at incident laboratory energies of 24.3 and 29.8 MeV, measured at the radioactive ion beam facility of TRIUMF, in Vancouver, Canada. A large yield of 9 Li fragments was detected by four charged particle telescopes in a wide angular range. The experimental angular and energy distributions of these 9 Li fragments have been compared to coupled-reaction-channel and continuum-discretized coupled-channel calculations. The large production of 9 Li fragments at small angles can be explained by considering a direct breakup mechanism, while at medium-large angles a competition between direct breakup and neutron transfer to the continuum of the 208 Pb target was observed.

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Evidence of Soft Dipole Resonance inLi11with Isoscalar Character

Cited by 64 publications

References 33 publications

Chiral NNLOsat descriptions of nuclear multipole resonances within the random-phase approximation

Chiral NNLOsat descriptions of nuclear multipole resonances within the random-phase approximation

Ab initio Gamow in-medium similarity renormalization group with resonance and continuum

Simultaneous analysis of the elastic scattering and breakup channel for the reactionLi11+Pb208at energies near the Coulomb barrier

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