Continuum excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>

Aumann, T.; Aleksandrov, D.; Axelsson, L.; Baumann, T.; Borge, María José García; Chulkov, L. V.; Cub, J.; Dostal, W.; Eberlein, Bernadette; Elze, Th. W.; Emling, H.; Geißel, H.; Goldberg, V. Z.; Golovkov, M. S.; Grünschloß, Andreas; Hellström, M.; Hencken, Kai; Holeczek, J.; Holzmann, R.; Jonson, B.; Korshenninikov, A. A.; Kratz, J. V.; Kraus, G.; Kulessa, R.; Leifels, Y.; Leistenschneider, A.; Leth, T.; Mukha, I.; Münzenberg, G.; Nickel, F.; Nilsson, T.; Nyman, G.; Petersen, B.; Pfützner, M.; Richter, A.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Schwab, W.; Simon, H.; Smedberg, M. H.; Steiner, M.; Stroth, J.; Surowiec, A.; Suzuki, Toshio; Tengblad, O.; Zhukov, M. V.

doi:10.1103/physrevc.59.1252

Cited by 275 publications

(281 citation statements)

References 44 publications

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“…[47], it is essential to calculate the nuclear breakup cross sections on the same footing as the Coulomb one. Similarly, in the breakup of 6 He on the Pb target at the higher beam energy of 240 MeV/nucleon, the calculated pure Coulomb two-neutron removal cross section is 62.5 mb, which is quite small as compared to the corresponding value of σ exp −2n [51]. This difference too can be understood from the fact that the cross sections corresponding to the nuclear elastic and inelastic breakup modes are quite large [33,37].…”

Section: Coulomb Part Of Total Two-neutron Removal Cross Sectionsmentioning

confidence: 60%

“…In Fig. 6, we show the comparison of our calculations with the data [51] for the neutron-neutron relative energy (E nn ) spectrum obtained in the breakup of 6 He on a Pb target at the beam energy of 240 MeV/nucleon. The calculated spectrum has been obtained by transforming the cross section shown in Eq.…”

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

“…We have also shown in this figure the results obtained with the dineutron model, which is clearly inadequate to describe the data. It should, however, be noted that the calculated cross sections have not been convoluted with the detector response matrix as suggested in [51]. As is shown in [51], this folding reduces the cross sections by about 20 % near the peak region, and by less that 5% beyond it.…”

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

“…In Fig. 7, we have compared the calculated n-4 He relative energy (E αn ) spectrum with the corresponding experimental data [51]. The peaks of the theo-retical calculations are normalized to the maximum of the experimental data.…”

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

“…In Fig. 8, we show the pure Coulomb contribution to the excitation energy (E ex ) spectrum in the breakup of 6 He on a Pb target at the beam energy of 240 MeV/nucleon [51]. Excitation energy is defined as the sum of the α-(n 1 -n 2 ) and n 1 -n 2 relative energies and the Q-value of the reaction.…”

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

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Four-body DWBA calculations of the Coulomb breakup of 6He

Chatterjee¹,

Banerjee²,

Shyam³

2001

Nuclear Physics A

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We investigate the Coulomb breakup of the two-neutron halo nucleus 6 He by extending the framework of the finite range post form distorted wave Born approximation theory introduced earlier for the description of the breakup of one-neutron halo nuclei. The model can use the realistic three-body wave function for the 6 He ground state. Calculations have been performed for energy, total and parallel momentum distributions of 4 He fragment. The two-body 4 He-neutron and neutron-neutron correlations have also been calculated. Our results are compared with those of an adiabatic model of the Coulomb breakup reactions. The two theories lead to almost identical results. Comparisons are also made with the available experimental data. It is found that the pure Coulomb breakup can describe the bulk of the data taken at below grazing angles. However, a rigorous description of all the available data requires the consideration of the nuclear breakup effects. PACS numbers: 24.50.+g, 25.60.Gc Key words: Coulomb breakup of 6 He, two-neutron halo nucleus, post form DWBA with finite range effects.

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Section: Coulomb Part Of Total Two-neutron Removal Cross Sectionsmentioning

confidence: 60%

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

Section: α-Particle Momentum Distributionsmentioning

confidence: 99%

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Four-body DWBA calculations of the Coulomb breakup of 6He

Chatterjee¹,

Banerjee²,

Shyam³

2001

Nuclear Physics A

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J-Matrix Approach to Loosely-Bound Three-Body Nuclear Systems

Lurie

Shirokov

The J-Matrix Method

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We discuss the extension of the oscillator-basis J-matrix formalism on the case of true A-body scattering. The formalism is applied to loosely-bound 11 Li and 6 He nuclei within three-body cluster models 9 Li + n + n and α + n + n. The J-matrix formalism is used not only for the calculation of the three-body continuum spectrum wave functions but also for the calculation of the S-matrix poles associated with the 11 Li and 6 He ground states to improve the description of the binding energies and ground state properties. The effect of the phase equivalent transformation of the n−α interaction on the properties of the 6 He nucleus is examined.

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Di-Neutron Clustering and Deuteron-like Tensor Correlation in Nuclear Structure Focusing on 11Li

et al. 2010

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11 Li is a Borromean nucleus, where two out of three objects as 9 Li + n and two neutrons independently do not form bound systems. Two neutrons should form a di-neutron cluster in the nuclear field generated by the 9 Li core nucleus. We treat di-neutron clustering by solving the two neutron relative wave function precisely by using the bare nucleon-nucleon interaction so that the spatial clustering structure is obtained quantitatively within the whole 11 Li nucleus. This di-neutron clustering is an essential dynamics to form the halo structure by making a compact di-neutron cluster, which distributes loosely around the 9 Li core. This concept of di-neutron clustering should be clearly distinguished from the BCS pairing correlation, where no consideration of spatial clustering is made. The di-neutron clustering is a new concept and is a general phenomenon in neutron skin and neutron halo nuclei.This quantitative description of di-neutron clustering has made it necessary to consider another important deuteron-like tensor correlation, which is caused by strong tensor interaction in the nucleon-nucleon interaction. The tensor interaction originates from pion exchange and known to provide large attraction to form the 4 He nucleus. The unique feature of the tensor correlation is to make highly correlated deuteron-like excitation, which interferes with shell model like structure in a unique way. This dynamical effect removes the magic number effect and makes There is a theoretical study on the pairing property and the E1 excitation in 11 Li by Esbensen and Bertsch [10]. In their study, it is essential to bring down the s 1/2 orbit to reproduce the experimental E1 excitation spectrum. As for the pairing correlation, there are many studies to describe 11 Li as the BCS state. In the study of Meng and Ring [11], they describe 11 Li in terms of a relativistic Hartree-Bogoliubov model. In this study, they can include the continuum effect in their pairing correlations. In the relativistic Hartree-Bogoliubov model, the s-wave contribution comes out to be about a quarter of the p-wave contribution for the paired two neutrons. We need more participation of the s-wave component as compared to the finding of the experimental data of Simon et al. [3].There is another interpretation on the halo structure as due to deformation. In the work of Varga, Suzuki and Lovas [12], they try to break the 9 Li core and introduce the cluster structure. The wave function of 11 Li is written as 4 He+t + 4n and take the interaction among them by a phenomenological central interaction. In this way, they can introduce the effect of the deformation and pairing correlations among the nucleons. The deformation effect provides a large matter radius and some s-wave component in the wave function.The theoretical challenge on the halo structure is therefore summarized as follows. There are many indications that the s-wave component is very large in the ground state wave function. Hence, we have to find a mechanism to bring down the s 1/2 orbit with the amount...

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Continuum excitations in6He

Cited by 275 publications

References 44 publications

Four-body DWBA calculations of the Coulomb breakup of 6He

Four-body DWBA calculations of the Coulomb breakup of 6He

J-Matrix Approach to Loosely-Bound Three-Body Nuclear Systems

Di-Neutron Clustering and Deuteron-like Tensor Correlation in Nuclear Structure Focusing on 11Li

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