Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip line

Matsuo, Masayuki; Mizuyama, Kazuhito; Serizawa, Yasuyoshi

doi:10.1103/physrevc.71.064326

Cited by 142 publications

(306 citation statements)

References 75 publications

(108 reference statements)

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“…However, this model is too simplistic, since it completely neglects the pairing correlation and the continuum couplings. Notice that the mixing of many partial wave components, especially those with different parities, is essential in order to have a spatially compact dineutron structure [9,10,21]. In fact, we do not see any indication of dineutron correlation in the result of Ref.…”

Section: Introductionmentioning

confidence: 62%

“…This is similar to what has been found in the Borromean nuclei, 11 Li and 6 He [6,26] (see also Figs. 1 and 2), and indicates clearly the strong dineutron correlation [7,9,10] in these nuclei.…”

Section: Applicability Of Hfb Method: Test On 6 He Nucleusmentioning

confidence: 99%

“…Although the dineutron structure as a consequence of the pairing correlation has been suggested for some time in 11 Li and 6 He nuclei [1,3], it is only recently that a strong indication of its existence has been obtained experimentally in the Coulomb dissociation of 11 Li [4]. The new measurement has stimulated lots of theoretical discussions on the dineutron correlation, not only in the 2n halo nuclei, 11 Li and 6 He [5,6,7,8], but also in medium-heavy neutronrich nuclei [9,10] as well as in infinite neutron matter [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…2 of Ref. [16]), despite that the dineutron structure is expected to be enhanced in many neutron-rich nuclei [7,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Although Refs. [9,10] have partially addressed this question by studying a two-particle density for medium-heavy neutron-rich nuclei, one would also need to explore a four-particle density, or many-particle density in general, in order to shed light on the ground state properties of neutron-skin nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Strong dineutron correlation inHe8andC18

2008

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We study the spatial structure of four valence neutrons in the ground state of 8 He and 18 C nuclei using a core+4n model. For this purpose, we employ a density-dependent contact interaction among the valence neutrons, and solve the five-body Hamiltonian in the Hartree-Fock-Bogoliubov (HFB) approximation. We show that two neutrons with the coupled spin of S=0 exhibit a strong dineutron correlation around the surface of these nuclei, whereas the correlation between the two dineutrons is much weaker. Our calculation indicates that the probability of the (1p 3/2 ) 4 and [(1p 3/2 ) 2 (p 1/2 ) 2 ] configurations in the ground state wave function of 8 He nucleus is 34.9% and 23.7%, respectively. This is consistent with the recent experimental finding with the 8 He(p, t) 6 He reaction, that is, the ground state wave function of 8 He deviates significantly from the pure (1p 3/2 ) 4 structure.

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Section: Introductionmentioning

confidence: 62%

Section: Applicability Of Hfb Method: Test On 6 He Nucleusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…2 of Ref. [16]), despite that the dineutron structure is expected to be enhanced in many neutron-rich nuclei [7,9,10].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strong dineutron correlation inHe8andC18

2008

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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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Are There Good Probes for the Di-Neutron Correlation in Light Neutron-Rich Nuclei?

Hagino

Sagawa

2015

Few-Body Syst

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The di-neutron correlation is a spatial correlation with which two valence neutrons are located at a similar position inside a nucleus. We discuss possible experimental probes for the dineutron correlation. This includes the Coulomb breakup and the pair transfer reactions of neutron-rich nuclei, and the direct two-neutron decays of nuclei beyond the neutron drip-line.Keywords Neutron-rich nuclei · Di-neutron correlation · Coulomb breakup · pair transfer reactions · two-neutron decays 1 IntroductionOne of the most important issues in many-body physics is to clarify the nature of correlations beyond the independent particle picture. In nuclear physics, the pairing correlation has been well recognized as a typical many-boy correlation[1; 2], which leads to a characteristic even-odd staggering of biding energy providing an extra binding for even-mass nuclei. A pairing interaction scatters nucleon pairs from a single-particle level below the Fermi surface to those above, and as a consequence, each singleparticle level is occupied with a fractional occupation probability.With the pairing correlation, one may naively expect that two nucleons forming a pair are located at a similar position inside a nucleus. A spatial structure of two valence neutrons has in fact attracted much attention in the past. One of the earliest publications on this problem is by Bertsch, Broglia, and Riedel, who solved a shell model for 210 Pb and showed that the two valence neutrons are strongly clusterized [3]. Subsequently, Migdal argued that two neutrons may be bound in a nucleus even though they are not bound in the vacuum [4].

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Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip line

Cited by 142 publications

References 75 publications

Strong dineutron correlation inHe8andC18

Strong dineutron correlation inHe8andC18

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

Are There Good Probes for the Di-Neutron Correlation in Light Neutron-Rich Nuclei?

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