Search for excited states in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mn>25</mml:mn></mml:mmultiscripts></mml:math>

Jones, Michael D.; Fossez, K.; Baumann, T.; DeYoung, Paul; Finck, J. E.; Frank, N.; Kuchera, A. N.; Michel, N.; Nazarewicz, W.; Rotureau, J.; Smith, J. K.; Stephenson, S. L.; Stiefel, K.; Thoennessen, M.; Zegers, R. G. T.

doi:10.1103/physrevc.96.054322

Cited by 17 publications

(15 citation statements)

References 46 publications

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“…In 25 O, the GSM calculation with the N 3 LO 2NF gives over-bound binding energy, while the inclusion of the N 2 LO 3NF describes well the unbound resonant property of the ground state with the resonance width agreeing well with the experimental measurement. A new excited state with a possible configuration of J π = 1/2 + was reported recently in the experiment [2]. The present calculations support the experimental suggestion.…”

Section: Indicated Bysupporting

confidence: 88%

“…The interest to study these nuclear systems has been invigorated with the latest experiments on 25−26 O, which are placed beyond the dripline. 26 O ground state has been found barely unbound with two-neutron separation energy of only −18 keV [1], and an excited state in the unbound resonant isotope 25 O has been observed in a recent experiment [2].…”

Section: Introductionmentioning

confidence: 99%

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Chiral three-nucleon force and continuum for dripline nuclei and beyond

Fang

Coraggio

et al. 2020

Physics Letters B

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Three-nucleon force and continuum play important roles in reproducing the properties of atomic nuclei around driplines. Therefore it is valuable to build up a theoretical framework where both effects can be taken into account to solve the nuclear Schrödinger equation. To this end, in this letter, we have expressed the chiral three-nucleon force within the continuum Berggren representation, so that bound, resonant and continuum states can be treated on an equal footing in the complex-momentum space. To reduce the model dimension and computational cost, the three-nucleon force is truncated at the normal-ordered two-body level and limited in the sd-shell model space, with the residual three-body term being neglected. We choose neutron-rich oxygen isotopes as the test ground because they have been well studied experimentally, with the neutron dripline determined. The calculations have been carried out within the Gamow shell model. The quality of our results in reproducing the properties of oxygen isotopes around the neutron dripline shows the relevance of the interplay between three-nucleon force and the coupling to continuum states. We also analyze the role played by the chiral three-nucleon force, by dissecting the contributions of the 2π exchange, 1π exchange and contact terms.

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Section: Indicated Bysupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Chiral three-nucleon force and continuum for dripline nuclei and beyond

Fang

Coraggio

et al. 2020

Physics Letters B

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“…In valence-space configuration interaction calculations, one obtains what is colloquially known as the Gamow Shell Model (GSM), which entails the large-scale diagonalization of a complex symmetric Hamiltonian (278). Applications of this method to weakly bound nuclei have been quite successful (281)(282)(283)(284)(285)(286)(287)(288)(289), and there is a push to move from the commonly used phenomenological interactions to fundamental ones (289). The Berggren basis has been used successfully in ground-and excited-state CC calculations (see, e.g., (128,210)), hence the inclusion in VS-IMSRG and SMCC is technically straightforward.…”

Section: Coupling To the Continuummentioning

confidence: 99%

Nonempirical Interactions for the Nuclear Shell Model: An Update

Stroberg

Bogner

Hergert

et al. 2019

Annu. Rev. Nucl. Part. Sci.

211

216

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The nuclear shell model has been perhaps the most important conceptual and computational paradigm for the understanding of the structure of atomic nuclei. While the shell model has been predominantly used in a phenomenological context, there have been efforts stretching back over a half century to derive shell model parameters based on a realistic interaction between nucleons. More recently, several ab initio many-body methods-in particular many-body perturbation theory, the no-core shell model, the in-medium similarity renormalization group, and coupled cluster theory-have developed the capability to provide effective shell model Hamiltonians. We provide an update on

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“…This is another difference with halo-EFT at leading-order as in the latter case the interaction is given by a regularized delta force in the 1 S 0 channel [42,43], which can be taken in a single Gaussian form. We stick to the original FHT form factor as it has proven to perform well in earlier studies [36,53,60,69]; our objective is to show how a simple, well established Hamiltonian based on effective scale arguments can capture the complex energy relations within the neutron-rich helium chain.…”

Section: Arxiv:180602936v1 [Nucl-th] 8 Jun 2018mentioning

confidence: 99%

Energy spectrum of neutron-rich helium isotopes: Complex made simple

2018

Self Cite

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We demonstrate that the intricate energy spectrum of neutron-rich helium isotopes can be straightforwardly described by taking advantage of the low-energy properties of neutron-neutron interaction and the scale separation that is present in diluted dripline systems. By using arguments based on the halo effective field theory, we carry out a parameter reduction of the complex-energy configuration interaction framework in the spd space, including resonant and scattering states. By adjusting only one parameter, the strength of the spin-singlet central neutron-neutron interaction, we reproduce experimental energies and widths of 5−8 He within tens of keV precision. We predict a parity inversion of narrow resonances in 9 He and show that the ground state of 10 He is an s-wave-dominated threshold configuration that could decay through two-neutron emission.Introduction.-The neutron-rich helium isotopes 5−10 He epitomize novel aspects of nuclear structure at and beyond the limit of nuclear binding. Experimentally, the even-even isotopes 6 He [1] and 8 He [2, 3] are Borromean halos, they have no bound excited states, and they exhibit an abnormal pattern of the one-and two-neutron emission thresholds. The odd-N isotopes 5 He [1,4,5] and 7 He [6,7] are neutron-unbound. Presently, too little is known about the elusive 9 He [8,9] and 10 He [3,4,[10][11][12][13][14][15][16][17][18][19] isotopes to firmly conclude whether they represent genuine nuclear systems or not. The current experimental information on the energy spectrum of 5−10 He is displayed in Fig. 1.

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Search for excited states in O25

Cited by 17 publications

References 46 publications

Chiral three-nucleon force and continuum for dripline nuclei and beyond

Chiral three-nucleon force and continuum for dripline nuclei and beyond

Nonempirical Interactions for the Nuclear Shell Model: An Update

Energy spectrum of neutron-rich helium isotopes: Complex made simple

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