Study of the cluster state at Ex=10.3 MeV in 12C

Itoh, M.; Akimune, H.; Fujiwara, M̄.; Garg, U.; Hashimoto, Hiroyuki; Kawabata, Tomoya; Kawase, K.; Kishi, S.; Murakami, T.; Nakanishi, K.; Nakatsugawa, Y.; Nayak, B. K.; Okumura, Satoru; Sakaguchi, H.; Takeda, Hiroyuki; Terashima, S.; Uchida, M.; Yasuda, Yusuke; Yosoi, M.; Zenihiro, J.

doi:10.1016/j.nuclphysa.2004.04.044

Cited by 135 publications

(78 citation statements)

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“…For the energy range of 10.5-11.1 MeV, however, the data are consistent with a 12 C(2 + ) contribution to the β-delayed breakup. This energy range is higher than that suggested by (α, α ) scattering experiments [3,22] and is more in line with the 11.16-MeV state previously speculated to be of possible 2 + character [13,50].…”

Section: Discussionsupporting

confidence: 87%

“…1). This is done to cope with the presence of other states in this energy region [20], many of which were populated in the previous inelastic-scattering experiments [3,4,13,21,22]. The populated resonances above threshold can all decay to three α particles, and the triple-α breakup of these states is measured using a segmented detector setup as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

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Breakup channels forC12triple-αcontinuum states

Diget¹,

Barker²,

Borge³

et al. 2009

Phys. Rev. C

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Section: Discussionsupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Breakup channels forC12triple-αcontinuum states

Diget¹,

Barker²,

Borge³

et al. 2009

Phys. Rev. C

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“…channels. This overlap feature of the resonant 0 + states in 12 Be contrasts with the observations in the respective N = Z system, 12 C, where there is no intermediate structure in a monopole distribution above the α-decay threshold [9].…”

Section: Introductioncontrasting

confidence: 83%

Imprint of adiabatic structures in monopole excitations ofBe12

Itô

2011

Phys. Rev. C

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The monopole excitations (0 + g.s. → 0 + ex ) of light neutron-excess systems 12 Be = α + α + 4N are investigated by the generalized two-center cluster model. We analyze the mechanism of an enhancement of the monopole strength in connection to structures of adiabatic energy surfaces as a function of an α-α distance. The crossing of two adiabatic energy surfaces, which have different intrinsic configurations, increases the monopole strength. Furthermore, we find that the monopole strength is strongly enhanced by a smooth connection in the adiabatic energy surface from the ground 0 + state to the excited 0 + state. A comparison of the calculated strength with the respective single particle limit is also discussed.

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“…4) has a far out reaching part consisting of two correlated protons, while the neutron distribution is almost spherical and only weakly polarized by the outer protons. This is in accord with the simplest picture that 17 Ne consists of an 15 O core plus two protons in either s 2 or d 2 configurations. Interaction cross sections [18] and longitudinal momentum distributions [19] support the halo picture.…”

Section: Neon Isotopes and Two-proton Halosupporting

confidence: 87%

Clusters, Halos, And S-Factors In Fermionic Molecular Dynamics^*

Feldmeier

Neff

2013

EPJ Web of Conferences

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Abstract. In Fermionic Molecular Dynamics antisymmetrized products of Gaussian wave packets are projected on angular momentum, linear momentum, and parity. An appropriately chosen set of these states span the many-body Hilbert space in which the Hamiltonian is diagonalized. The wave packet parameters -position, momentum, width and spin -are obtained by variation under constraints. The great flexibility of this basis allows to describe not only shell-model like states but also exotic states like halos, e.g. the two-proton halo in 17 Ne, or cluster states as they appear for example in 12 C close to the α breakup threshold where the Hoyle state is located. Even a fully microscopic calculation of the 3 He(α,γ) 7 Be capture reaction is possible and yields an astrophysical S-factor that compares very well with newer data. As representatives of numerous results these cases will be discussed in this contribution, some of them not published so far. The Hamiltonian is based on the realistic Argonne V18 nucleon-nucleon interaction. Fermionic Molecular Dynamics (FMD)In the FMD approach we employ Gaussian wave packetsas single-particle basis states. The complex parameters b encode the mean positions and momenta of the wave packets and a the widths of the wave packets. The spins can assume any direction, isospin is ±1 denoting a proton or a neutron. Intrinsic many-body basis states are Slater determinantsthat reflect deformation or clustering and break the symmetries of the Hamiltonian with respect to parity, rotation and translation. To restore the symmetries the intrinsic basis states are projected on parity, angular momentum and total linear momentumIn a full FMD calculation the many-body Hilbert space is spanned by a set of N projected intrinsic basis states Q (a) ; J π MK; P = 0 , a = 1, . . . , N . By diagonalizing the Hamiltonian in this set of non-orthogonal basis states the amplitudes of the various configurations contained in the many-body eigenstate are determined.Starting from the realistic Argonne V18 interaction [1] we derive a phase-shift-equivalent effective lowmomentum interaction using the unitary correlation operator method (UCOM). The basic idea of the UCOM approach is to explicitly include short-range central and Cluster States in 1CThe structure of the second 0 + 2 state in 12 C, the Hoyle state, is enjoying renewed and still growing interest in nuclear structure research [5][6][7][8][9]. In [10] we investigated its structure with a model space spanned by angular momentum projected FMD configurations obtained by variation plus a full set of projected three-α triangular configurations. We found that the Hoyle state is very dilute and extended, consisting mainly of well distinguished α-clusters. This is illustrated in the top part of Fig. 1 where we show the density distribution of those intrinsic FMD basis states that have the largest overlap with the ground state and the Hoyle state.While the leading intrinsic configuration of the ground state is very compact, and after projection on good angular moment...

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Study of the cluster state at Ex=10.3 MeV in 12C

Cited by 135 publications

References 0 publications

Breakup channels forC12triple-αcontinuum states

Breakup channels forC12triple-αcontinuum states

Imprint of adiabatic structures in monopole excitations ofBe12

Clusters, Halos, And S-Factors In Fermionic Molecular Dynamics^*

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Study of the cluster state at Ex=10.3 MeV in 12C

Cited by 135 publications

References 0 publications

Breakup channels forC12triple-αcontinuum states

Breakup channels forC12triple-αcontinuum states

Imprint of adiabatic structures in monopole excitations ofBe12

Clusters, Halos, And S-Factors In Fermionic Molecular Dynamics*

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Product

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Clusters, Halos, And S-Factors In Fermionic Molecular Dynamics^*