Observation of Spin-Orbit Splitting in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>Single-Particle States

Ajimura, S.; Hayakawa, Hisao; Kishimoto, T.; Kohri, H.; Matsuoka, K.; Minami, S.; Mori, Takasuke; Morikubo, K.; Saji, Etsuro; Sakaguchi, A.; Shimizu, Y.; Sumihama, M.; Chrien, R.E.; May, M.; Pile, P.; Rusek, A.; Sutter, Reto; Eugenio, P.; Franklin, G.; Khaustov, P.; Paschke, K.; Quinn, B.; Schumacher, R. A.; Franz, J.; Fukuda, T.; Noumi, H.; Outa, H.; Gan, Lu; Tang, L.; Yuan, L.; Tamura, H.; Nakano, Junzo; Tamagawa, Toru; Tanida, K.; Sawafta, R.

doi:10.1103/physrevlett.86.4255

Cited by 132 publications

(70 citation statements)

References 25 publications

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“…From this spin assignment, the previous result for the Λ-spin-dependent spin-orbit force parameter of −0.02 < S Λ < 0.03 MeV [7] was improved to −0.02 < S Λ < −0.01 MeV. This sign of the Λ-spin-dependent spinorbit term is consistent with the p 1/2 − p 3/2 spin-orbit splitting in 13 Λ C measured with NaI counter arrays by the BNL E929 experiment [12].…”

supporting

confidence: 69%

γ-ray spectroscopy in Λ hypernuclei

Tamura¹,

Ajimura²,

Akikawa³

et al. 2005

Nuclear Physics A

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The present status of hypernuclear γ-ray spectroscopy with Hyperball is summarized. We observed two γ transitions of 16 Λ O(1 − → 1 − , 0 − ) and obtained the strength of the ΛN tensor force. In 10 B(K − , π − γ) data, we did not observe the spin-flip M1 transition of 10 Λ B(2 − → 1 − ), but γ rays from hyperfragments such as 7 Λ Li(7/2 + → 5/2 + ) and 9 Λ Be(3/2 + → 1/2 + ) were observed. In 11 B(π + , K + γ) data, we observed six γ transitions of 11 Λ B. We also attempted an inclusive γ-ray measurement with stopped K − beam. † Present address:

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supporting

confidence: 69%

γ-ray spectroscopy in Λ hypernuclei

Tamura¹,

Ajimura²,

Akikawa³

et al. 2005

Nuclear Physics A

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“…The energy splitting between these states is as small as 199 keV, which reflects mainly the spin-orbit splitting of Λ hyperon in the p 3/2 and p 1/2 states. The obtained splitting is in a good agreement with the empirical value, 152±54±36 keV [18].…”

Section: Application To the 13 λ C Hypernucleussupporting

confidence: 78%

Beyond-Mean-Field Approach to Low-Lying Spectra of Λ Hypernuclei

Hagino¹,

Mei²,

Yao

et al. 2017

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

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Taking the hypernucleus 13Λ C as an example, we illustrate the miscroscopic particle-rotor model for low-lying spectra of hypernuclei. This approach is based on the beyond-mean-field method, with the particle number and angular momentum projections. The quantum fluctuation of the mean-field is also taken into account for the core nucleus using the generator coordinate method. We show that the impurity effect of Λ hyperon, such as a change in B(E2), is well described with this model. Our calculation indicates that the most important impurity effect in sd-shell hypernuclei is a change in a deformation parameter rather than in a nuclear size.

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“…Sophisticated AMD calculation [14] has shown that the low-lying states of 12 C have a mixed nature between the 0p 3/2 subshell closure configuration and the 3α cluster structure, and the mixing strength is different for each state. Since the particle changes the deformation and spin properties of 12 C, it will have influence on the N spin-orbit splitting of 13 C [38][39][40].…”

Section: B Discussion On Each Hypernucleusmentioning

confidence: 99%

Deformation of hypernuclei studied with antisymmetrized molecular dynamics

et al. 2011

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An extended version of antisymmetrized molecular dynamics was developed to study the structure of p-sd shell hypernuclei. By using an effective N interaction, we investigated the energy curves of 9 Be, 13 C, and 20,21 Ne as a function of nuclear quadrupole deformation. The changes to nuclear deformation caused by particles are discussed. We found that in the p wave enhances nuclear deformation, while that in the s wave reduces it. This effect is most prominent in 13 C. The possibility of parity inversion in 20 Ne is also examined.

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Observation of Spin-Orbit Splitting inΛSingle-Particle States

Cited by 132 publications

References 25 publications

γ-ray spectroscopy in Λ hypernuclei

γ-ray spectroscopy in Λ hypernuclei

Beyond-Mean-Field Approach to Low-Lying Spectra of Λ Hypernuclei

Deformation of hypernuclei studied with antisymmetrized molecular dynamics

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