Elastic scattering and breakup of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Be</mml:mi><mml:mprescripts /><mml:none /><mml:mn>11</mml:mn></mml:mmultiscripts></mml:math>on protons at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>26.9</mml:mn><mml:mi>A</mml:mi></mml:mrow></mml:math>MeV

Chen, J.; Lou, J. L.; Ye, Y. L.; Li, Z. H.; Ge, Yufeng; Li, Q. T.; Li, J.; Jiang, Wei; Sun, Y.; Zang, H. L.; Aoi, N.; Ideguchi, E.; Ong, H. J.; Ayyad, Y.; Hatanaka, K.; Tran, D. T.; Yamamoto, Tetsuya; Tanaka, M.; Suzuki, Tomokazu; Thơ, Nguyễn Thị Mai; Rangel, J.; Moro, A. M.; Pang, D. Y.; Lee, J.; Wu, J.; Liu, Hongna; Wen, Chao

doi:10.1103/physrevc.93.034623

Cited by 22 publications

(22 citation statements)

References 40 publications

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“…As in previous works [15,19,34], the 11 Be structure is described with the Hamiltonian of Ref. [35] (model Be12-b), which consists of a Woods-Saxon central part (R = 2.483 fm, a = 0.65 fm) and a parity-dependent strength (V c = −54.24 MeV for positive-parity states and V c = −49.67 MeV for negative-parity ones).…”

Section: Application To 11 Be Reactionsmentioning

confidence: 99%

Extracting three-body breakup observables from continuum-discretized coupled-channels calculations with core excitations

2017

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Background Core-excitation effects in the scattering of two-body halo nuclei have been investigated in previous works. In particular, these effects have been found to affect in a significant way the breakup cross sections of neutron-halo nuclei with a deformed core. To account for these effects, appropriate extensions of the continuum-discretized coupled-channels (CDCC) method have been recently proposed.Purpose We aim to extend these studies to the case of breakup reactions measured under complete kinematics or semi-inclusive reactions in which only the angular or energy distribution of one of the outgoing fragments is measured.Method We use the standard CDCC method as well as its extended version with core excitations (XCDCC), assuming a pseudo-state basis for describing the projectile states. Two-and three-body observables are computed by projecting the discrete two-body breakup amplitudes, obtained within these reaction frameworks, onto two-body scattering states with definite relative momentum of the outgoing fragments and a definite state of the core nucleus.Results Our working example is the one-neutron halo 11 Be. Breakup reactions on protons and 64 Zn targets are studied at 63.7 MeV/nucleon and 28.7 MeV, respectively. These energies, for which experimental data exist, and the targets provide two different scenarios where the angular and energy distributions of the fragments are computed. The importance of core dynamical effects is also compared for both cases. ConclusionsThe presented method provides a tool to compute double and triple differential cross sections for outgoing fragments following the breakup of a two-body projectile, and might be useful to analyze breakup reactions with other deformed weakly-bound nuclei, for which core excitations are expected to play a role. We have found that, while dynamical core excitations are important for the proton target at intermediate energies, they are very small for the Zn target at energies around the Coulomb barrier.

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Section: Application To 11 Be Reactionsmentioning

confidence: 99%

Extracting three-body breakup observables from continuum-discretized coupled-channels calculations with core excitations

2017

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“…However, there is evidence that this approximate model is not always accurate [11][12][13]. For example, recent calculations [14] have shown that, in collisions of 11 Be with light targets, the explicit inclusion of the DCE mechanism gives rise to a sizable increase of the breakup cross section. This is particularly important for excitation energies around the low-lying 3/2 + resonance, where the effect is enhanced due to the dominant 10 Be(2 + ) configuration for this resonance.…”

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confidence: 99%

Evidence of strong dynamic core excitation inC19resonant break-up

Lay¹,

Diego²,

Crespo³

et al. 2016

Phys. Rev. C

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The resonant break-up of 19 C on protons measured at RIKEN [Phys. Lett. B 660, 320 (2008)] is analyzed in terms of a valence-core model for 19 C including possible core excitations. The analysis of the angular distribution of a prominent peak appearing in the relative-energy spectrum could be well described with this model and is consistent with the previous assignment of 5/2 + for this state. Inclusion of core-excitation effects are found to be essential to give the correct magnitude of the cross section for this state. By contrast, the calculation assuming an inert 18 C core is found to largely underestimate the data.

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“…Two parallel-plate avalanche counters (PPAC) placed upstream of the target provided beam tracking information, with the resolution of incident angles and hitting positions on the target less than 0.3 • and 2.0 mm, respectively. Elastic scattering of 11 Be from protons or deuterons was measured by using a (CH 2 ) n (4.00 mg/cm 2 ) or a (CD 2 ) n (4.00 mg/cm 2 ) target, respectively, with the C-target (12.58 mg/cm 2 ) providing the background subtraction [29,30]. The same (CD 2 ) n target was used for the 11 Be(d, p) 12 Be reaction.…”

Section: Methodsmentioning

confidence: 99%

“…Only the elastic scattering data are shown here, and the data from breakup channels were detailed in Refs. [29,30]. The elastic scattering or breakup reaction channels were separated by the coincidence of 11 Be or 10 Be measured by the TELE0 and light particles (protons/deuterons) detected by the TELE1.…”

Section: A Elastic Scattering Reactionmentioning

confidence: 99%

“…Because most of the global OPs are mainly extracted from the stable nuclei data, renormalization factors for the real and imaginary central potentials are often required when applied to the scattering of light exotic nuclei [32,33]. For the elastic scattering of 11 Be on protons, OP parameters were searched based on the CH89 [34] global OPs, and the resulting renormalization factors for the real and imaginary part are 0.78 and 1.02, respectively [29].…”

Section: A Elastic Scattering Reactionmentioning

confidence: 99%

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Low-lying states in Be12 using one-neutron transfer reaction

Chen¹,

Lou²,

Ye³

et al. 2018

Phys. Rev. C

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A new one-neutron adding reaction on 11 Be was performed at 26.9A MeV. The elastic scattering data was measured simultaneously to determine the target component and optical potentials for the entrance channel. A special isomer-tagging method was used to determine the cross sections for the 0 + 2 state. Based on the ratio of the s−wave spectroscopic factors of the 0 + 1 and 0 + 2 states, along with the previously reported p−wave intensities, the s− and d−wave components of these two states were obtained and compared with shell model calculations using various interactions. The result shows a dominant d−wave strength in the ground state of 12 Be, and reveals the dominance of sd-and sp-single-particle configurations in the 2 + and 1 − state of 12 Be, respectively. Together with the configuration mixing analysis, the relative spectroscopic factors, which are shown to be less sensitive to the different choice of optical potentials, provide important insights on the wave functions for the low-lying states of 12 Be.

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Elastic scattering and breakup ofBe11on protons at26.9AMeV

Cited by 22 publications

References 40 publications

Extracting three-body breakup observables from continuum-discretized coupled-channels calculations with core excitations

Extracting three-body breakup observables from continuum-discretized coupled-channels calculations with core excitations

Evidence of strong dynamic core excitation inC19resonant break-up

Low-lying states in Be12 using one-neutron transfer reaction

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