Hyperons as a Probe of Nuclear Deformation

Schulze, H.-J.; Win, Myaing Thi; Hagino, K.; Sagawa, H.

doi:10.1143/ptp.123.569

Cited by 53 publications

(109 citation statements)

References 16 publications

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“…As mentioned above, the mean-field like and α + 16 O structures are mixed in the K π = 0 + band, while the K π = 0 − band has a pronounced α+ 16 O cluster structure. In Table III, it is seen that the B Λ of the 21 Λ Ne.…”

Section: Impurity Effects Depending On the Structure In 21mentioning

confidence: 61%

“…Since most nuclei manifest quadrupole deformation, it is of interest to investigate changes of nuclear deformations due to the addition of a Λ particle, which many authors have studied [7,[14][15][16][17][18][19][20].…”

Section: Deformation Change Caused By a λ Particlementioning

confidence: 99%

“…In 13 Λ C and 12 Λ Be, the α cluster structure is enhanced at large β on the energy curves, which makes the overlap I smaller. In 21 Λ Ne, the core nucleus 20 Ne is clusterized into α+ 16 O with a large β. Since 16 O has larger mass number than the α, the decrease of I is suppressed in the α+ 16 O cluster states.…”

Section: Deformation Change Caused By a λ Particlementioning

confidence: 99%

“…The core nucleus 20 Ne is a typical sdshell nucleus with various structures within the small excitation energy range [3][4][5]. It is known that the K π = 0 − band has a pronounced α+ 16 O clustering, while the ground-state band shows mixture of deformed shell structure and α + 16 O cluster structure. Therefore, it is of interest to investigate how a Λ particle affects and modifies their structures.…”

Section: Impurity Effects Depending On the Structure In 21mentioning

confidence: 99%

“…Furthermore, in 21 Λ Ne, we also discuss the dependence of impurity effects on structures, namely their difference between mean-filed like and α + 16 O + Λ cluster states. In 20 Ne [3][4][5], it is known that the K π = 0 − band has a pronounced α+ 16 O clustering, while the ground-state band has a mixture of deformed shell structure and α + 16 O cluster structure. Another aim is a rather challenging: to show the possibility of using a Λ particle as a probe to investigate structure of the core nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Impurity Effects in Λ Hypernuclei

Isaka¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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The antisymmetrized molecular dynamics model is applied to investigate changes of the nuclear deformation caused by the addition of a Λ particle. We focus on the p-shell ( 13 Λ C), sd-shell ( 21 Λ Ne), and neutron-rich ( 12 Λ Be) Λ hypernuclei. By performing a variation of calculation, it is found that the Λ particle reduces the nuclear deformation, which results from the competition between the energy of the core nucleus and the energy gain by adding the Λ particle. In 21 Λ Ne and 12 Λ Be, the difference of the Λ binding energy between structures is also studied.

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Section: Impurity Effects Depending On the Structure In 21mentioning

confidence: 61%

Section: Deformation Change Caused By a λ Particlementioning

confidence: 99%

Section: Deformation Change Caused By a λ Particlementioning

confidence: 99%

Section: Impurity Effects Depending On the Structure In 21mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impurity Effects in Λ Hypernuclei

Isaka¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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Impurity effect of Lambda hyperon on collective excitations of nuclear core in MgΛ25

Yao¹,

Li²,

Hagino³

et al. 2011

Nuclear Physics A

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Taking the ground state rotational band in 24 Mg as an example, we investigate the impurity effect of Λ hyperon on collective excitations of atomic nuclei in the framework of non-relativistic energy density functional theory. To this end, we take into account correlations related to the restoration of broken symmetries and fluctuations of collective variables by solving the eigenvalue problem of a five-dimensional collective Hamiltonian for quadrupole vibrational and rotational degrees of freedom. The parameters of the collective Hamiltonian are determined with constrained mean-field calculations for triaxial shapes using the SGII Skyrme force. We compare the low-spin spectrum for 24 Mg with the spectrum for the same nucleus inside 25 Λ Mg. It is found that the Λ hyperon stretches the ground state band and reduces the B(E2 : 2 + 1 → 0 + 1 ) value by ∼ 9%, mainly by softening the potential energy surface towards the spherical shape, even though the shrinkage effect on the average proton radius is only ∼ 0.5%.

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Collective excitations of Λ hypernuclei

et al. 2013

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We discuss low-lying collective excitations of Λ hypernuclei using the self-consistent mean-field approaches. We first discuss the deformation properties of Λ hypernuclei in the sd-shell region. Based on the relativistic mean-field (RMF) approach, we show that the oblate deformation for 28 Si may disappear when a Λ particle is added to this nucleus. We then discuss the rotational excitations of 25 Λ Mg using the three-dimensional potential energy surface in the deformation plane obtained with the Skyrme-Hartree-Fock method. The deformation of 25 Λ Mg is predicted to be slightly reduced due to an addition of a Λ particle. We demonstrate that this leads to a reduction of electromagnetic transition probability, B(E2), in the ground state rotational band. We also present an application of random phase approximation (RPA) to hypernuclei, and show that a new dipole mode, which we call a soft dipole Λ mode, appears in hypernuclei, which can be interpreted as an oscillation of the Λ particle against the core nucleus.

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Hyperons as a Probe of Nuclear Deformation

Cited by 53 publications

References 16 publications

Impurity Effects in Λ Hypernuclei

Impurity Effects in Λ Hypernuclei

Impurity effect of Lambda hyperon on collective excitations of nuclear core in MgΛ25

Collective excitations of Λ hypernuclei

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