Probing the 11Li halo structure by two-neutron interferometry experiments

Petrașcu, M.; Constantinescu, A.; Cruceru, I.; Giurgiu, M.; Isbasescu, A.; Petrascu, H.; Bordeanu, C.; Tanihata, I.; Kobayashi, T.; Morimoto, K.; Katori, K.; Ozawa, A.; Suda, T.; Yoshida, Kôichi; Nishimura, S.; Chiba, M.; Nishi, Yuji

doi:10.1016/j.nuclphysa.2004.04.097

Nuclear Physics A

2004

DOI: 10.1016/j.nuclphysa.2004.04.097

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Probing the 11Li halo structure by two-neutron interferometry experiments

M. Petrașcu

A. Constantinescu

I. Cruceru

et al.

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Cited by 11 publications

(16 citation statements)

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“…So, in this case we have C nn ≈ 0.40C exp nn . We also compare our calculation with another model, given in [9], which is close to the one presented in [5] in the framework of [11]. We observe that the different behavior between our and other models, essential for the absolute normalization of the data, will appear at higher momentum values.…”

supporting

confidence: 59%

“…The nn FSI is shown to play a crucial role in distorting the relative motion of the neutrons and it is a source of interference effects which leads to an unexpected minimum of the C nn , as a function of p nn , pushing the asymptotic behavior (where C nn = 1) to larger momentum. By comparing our results with the available experimental ones [5,8,9], we found that it is reasonable to expect a different normalization for the data, as will be shown.We use a three-body model in the limit of zero-range interaction, which retains the essential physics of the weakly bound and large two-neutron halo systems [2,3]. The interaction singularity is tamed in a renormalized zero-range model [12][13][14][15] which is appropriate to study weakly bound three-body systems.…”

supporting

confidence: 53%

“…Our model calls for a different normalization of the experimental C nn obtained in Refs. [5,8,9]. We believe that the qualitative picture presented by our model, evidencing a minimum of C nn , will survive in a more realistic three-body approach.…”

mentioning

confidence: 56%

“…In the inset of Fig. 2, this effect is clear and shown by the variation of the n− 9 Li virtual state energy from 0.05 to 0.8 MeV, while S 2n is kept fixed at 0.37 MeV. The increase of S 2n from 0.29 to 0.37 MeV, with E nA fixed at 0.05 MeV, also implies in reducing the size of the three-body system.…”

mentioning

confidence: 88%

“…Finally, we observe a good agreement between theory and experimental results, provided that the data fits, C exp nn , are appropriately normalized. In view of our findings, it will be very interesting to improve the experiments [5,[8][9][10], particularly at higher momenta, in order to characterize the existence of the minimum in C nn .…”

mentioning

confidence: 98%

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Neutron-neutron correlation in the halo dissociation of light exotic nuclei

2005

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We present model results for the two-halo-neutron correlation functions, C nn , for the dissociation process of light exotic nuclei modelled as two neutrons and a core. A minimum is predicted for C nn as a function of the relative momentum of the two neutrons, p nn , due to the coherence of the neutrons in the halo and final state interaction. Studying the systems 14 Be, 11 Li,and 6 He within this model, we show that the numerical asymptotic limit, C nn → 1, occurs only for p nn > ∼ 400 MeV/c, while such limit is reached for much lower values of p nn in an independent particle model as the one used in the analysis of recent experimental data. Our model is consistent with data once the experimental correlation function is appropriately normalized. The discovery of radioactive exotic weakly bound nuclei, rich in neutrons or protons, beyond the drip line have brought a lot of interest in the nuclear structure and reactions of these unstable nuclei. The traditional nuclear models are unable to describe the long-range correlations between the nucleons of the halo. The large size of the halo has stimulated several experimental and theoretical studies devoted to clarify the new aspects of the structure, stability, and reaction of these nuclei, including astrophysical applications (see, for example, [1][2][3]).The effect of the large spatial extension of the neutron halo, was probed in a recent fusion experiment of 6 He with 238 U target [4]. It was observed a large reaction cross section due to a direct 2n (n represents a neutron) transfer rather than an enhancement of the complete fusion cross section. In view of the large size of the halo (r rms nn = 5.9 ± 1.2 fm [5], r rms nn is the nn root-mean-square radius) which is comparable to the size of 238 U itself, it is most likely that a correlated neutron-neutron (nn) is transferred to 238 U while the 4 He is still far from the fusion barrier, favoring the 2n transfer process.A novel view of the complete fusion reaction for large halo nuclei also emerges [6]: It is most probable that the core approaches the fusion barrier of an excited target nucleus that has already absorbed the halo. This interpretation is in line with the concept of an absorptive many-body potential written in the relative coordinates of the core, two neutrons, and the target [7].The need for a deeper insight into the key aspects of the structure and dynamics of the halo in Borromean three-body systems (where all the subsystems are unbound), like 6 He is evident. In this respect, using intensity interferometry applied with a new iterative technique, Marqués et al. [5,8] recently probed the spatial configuration of two-neutron halo systems and estimated the mean-square nn distances as well, considering the dissociation of 6 He, 11 Li, and 14 Be in the field of a heavy nucleus target. The spatial configuration of 11 Li was also studied by Petrascu et al. [9,10]. The nn correlation function, C nn , is extracted as a function of the relative momentum between the neutrons, p nn . As the absolute normaliza...

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supporting

confidence: 59%

supporting

confidence: 53%

mentioning

confidence: 56%

mentioning

confidence: 88%

mentioning

confidence: 98%

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Neutron-neutron correlation in the halo dissociation of light exotic nuclei

2005

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Universal Aspects of Neutron Halos in Light Exotic Nuclei

Frederico

2014

Few-Body Syst

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Structure of large two-neutron halos in light exotic nuclei

Frederico¹,

Yamashita²,

Tomio³

2007

Nuclear Physics A

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Probing the 11Li halo structure by two-neutron interferometry experiments

Cited by 11 publications

References 0 publications

Neutron-neutron correlation in the halo dissociation of light exotic nuclei

Neutron-neutron correlation in the halo dissociation of light exotic nuclei

Universal Aspects of Neutron Halos in Light Exotic Nuclei

Structure of large two-neutron halos in light exotic nuclei

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