Structures of Light Halo Nuclei

Furutachi, Naoya; Kimura, Masaaki; Doté, Akinobu; Kanada-En’yo, Yoshiko

doi:10.1143/ptp.122.865

Cited by 20 publications

(14 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also we notice that we underestimate the proton breakup in this case although from Fig.1 it can be seen that we are using the smallest strong absorption radius (R s =5.3fm) of the three obtained for the system 8 B- 9 Be from the folding model using densities of Refs. [10,24,25]. The shape of the 8 C spectrum is however quite well reproduced, we miss only a small part of the tail.…”

Section: Comparison Between Data and Model Calculationsmentioning

confidence: 66%

“…In Fig.1, RHS, we show the imaginary parts of the 6 Be- 9 Be folding potential at 64 AMeV and of 8 B- 9 Be at 65 AMeV, while on the LHS, we compare three 8 B-9 Be S-matrices obtained with the 8 B densities of Refs. [10,24,25] respectively. In order to discuss the sensitivity of the results, it is useful to make the parametrization |S ct | 2 = exp[−ln2(exp(R s − b c )/a))] where the S-matrix is given in terms of a strong absorption radius R s and a diffusivity a.…”

Section: N-target and Core-target Optical Potentialsmentioning

confidence: 99%

See 1 more Smart Citation

Knockout beyond the dripline

Bonaccorso¹,

Charity²,

Kumar³

et al. 2015

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract.In this contribution, we will describe neutron and proton removal from 9 C and 7 Be which are two particularly interesting nuclei entering the nucleo-synthesis pp-chain [1,2]. Neutron and proton removal reactions have been used in the past twenty years to probe the single-particle structure of exotic nuclei. The core parallel-momentum distribution can give information on the angular momentum and spin of the nucleon initial state while the total removal cross section is sensitive to the asymptotic part of the initial wave function and also to the reaction mechanism. Because knockout is a peripheral reaction from which the Asymptotic Normalization Constant (ANC) of the single-particle wave function can be extracted, it has been used as an indirect method to obtain the rate of reactions like 8 B(p,γ) 9 C or 7 Be(p, γ ) 8 B.Nucleon removal has recently been applied by the HiRA collaboration [3] to situations in which the remaining "core" is beyond the drip line, such as 8 C and 6 Be, unbound by one or more protons, and whose excitation-energy spectrum can be obtained by the invariant-mass method. By gating on the ground-state peak, "core" parallel-momentum distributions and total knockout cross sections have been obtained similar to previous studies with well-bound "cores". In addition for each projectile, knock out to final bound states has also been obtained in several cases.We will report on the theoretical description and comparison to this experimental data for a few cases for which advances in the accuracy of the transfer-to-the continuum model [4,5] have been made [6]. These include the use, when available, of "ab-initio" overlaps for the initial state [7] and in particular their ANC values [8]. Also, the construction of a nucleus-target folding potential for the treatment of the core-target S-matrix [9] using for the cores "ab-initio" densities [10] and state-ofthe-art n-9 Be optical potentials [11]. Preliminary results and open problems will be discussed.

show abstract

Section: Comparison Between Data and Model Calculationsmentioning

confidence: 66%

Section: N-target and Core-target Optical Potentialsmentioning

confidence: 99%

Knockout beyond the dripline

Bonaccorso¹,

Charity²,

Kumar³

et al. 2015

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…In Fig.1, RHS, we compare three 8 B-9 Be S-matrices obtained with the 8 B densities of Refs. [22][23][24] respectively. In order to discuss the sensitivity of the results it is useful to parametrize |S ct | 2 = exp(−ln2e (R s −b c )/a ) in terms of the strong absorption radius R s and a diffusivity a.…”

Section: Choice Of the Core-target S-matrixmentioning

confidence: 99%

Reaction Dynamics for Light Dripline Nuclei

Bonaccorso¹

2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

View full text Add to dashboard Cite

The dynamics of light drip line nuclei in the scattering off a light target such as 9 Be is discussed with special attention to the use of the very versatile breakup reaction mechanism as a probe for both projectile and target single-particle degrees of freedom. We will discuss it via the transferto-the-continuum method which considers on equal footing the initial and the final state, requires the accurate knowledge of the breakup-particle-target optical potential and of the core-target optical potential. We will use a recently derived n-9 Be optical potential and its single folding with the ejectile density which consistently provides the core-target interaction. Some of the nuclei we wish to study are drip-line nuclei, unstable with respect to either neutron or proton decay, as they represent extreme cases for the effect of the nuclear interaction.

show abstract

“…35), 36) In principle, the width parameters can be different for each Gaussian wave packet as Ref. 37). However, in the application to 10 Be in the present work, we use the common width ν = 0.235 fm −2 for all single-particle wave functions for simplicity.…”

Section: Amd Wave Functionmentioning

confidence: 99%

A New Approach to Investigate Dineutron Correlation and Its Application to 10Be

Kobayashi

Kanada-En’yo

2011

Progress of Theoretical Physics

Self Cite

View full text Add to dashboard Cite

We propose a new framework by means of the dineutron condensate (DC) wave function to describe the dineutron correlation, which is characterized by the spatially strong correlation of a spin-zero neutron-neutron pair, in neutron-rich nuclei with an active deformed core surrounded by valence neutrons. Using the DC wave function for a 2α+2n system, which corresponds to a toy model for the 10 Be system, we investigate the neutron-neutron correlation around the 2α core and discuss the mechanism of the dineutron formation at the surface of finite nuclei. To investigate dineutron correlations in realistic nuclear systems, we superpose the antisymmetrized molecular dynamics (AMD) wave functions and the DC wave functions. Applying the AMD+DC method to 10 Be, we show effects of the DC wave functions in the ground and excited 0 + states of 10 Be and discuss the dineutron correlation in them.Subject Index: 210, 211, 213 §1. IntroductionRecently, neutron-rich unstable nuclei are investigated intensively and various exotic phenomena have been discovered. The dineutron correlation is one of the key issues attracting a great interest in the physics of unstable nuclei. The dineutron correlation means the strong spatial correlation between two neutrons in the spinzero channel. Even though two neutrons do not form a bound state in free space, they attract each other rather strongly. It was suggested that the spatial correlations between two neutrons are enhanced, such as in a low-density region of an infinite nuclear matter, 1)-7) in the surface region of neutron-skin nuclei 8)-11) and that of neutron-halo nuclei. 12)-25) In such nuclear systems, the strongly correlated neutronpair with a rather compact size can be regarded as a semi-bound or a virtually bound state called a dineutron. The dineutron correlation is considered to be an important aspect to understand the structures of unstable nuclei.In studies of the symmetric and asymmetric nuclear matter, it was shown that the strength of the two-neutron correlation changes as a function of the matter density. 1)-7) Matsuo suggested a continuous transitions from a weak BCS-like coupling to a strong boson-like coupling in accordance with a decrease of the matter density 5) (the BCS-BEC crossover, such as in a superfluid Fermi gas 26) ). The bosonic behavior of dineutrons is often discussed in relation to the α condensation suggested in a low-density symmetric nuclear matter. 27) In finite nuclear systems, the importance of the pairing correlation in spherical and deformed nuclei has been discussed well so far. In the medium-heavy nuclei, Matsuo et al. have investigated the neutron-neutron correlation and collective modes

show abstract

Structures of Light Halo Nuclei

Cited by 20 publications

References 2 publications

Knockout beyond the dripline

Knockout beyond the dripline

Reaction Dynamics for Light Dripline Nuclei

A New Approach to Investigate Dineutron Correlation and Its Application to 10Be

Contact Info

Product

Resources

About