Updated results on the 11ΛB and 12ΛC γ-ray spectroscopy study

Ma, Yue; Ajimura, S.; Aoki, Katsumi; Dairaku, M.; Fu, Yuanyong; Fujioka, Hiroyuki; Fukuda, T.; Futatsukawa, K.; Hosomi, K.; Imoto, W.; Kawai, M.; Kakiguchi, Y.; Kinoshita, S.; Koike, T.; Maruyama, N.; Mimori, M.; Minami, S.; Miura, Y.; Miwa, K.; Miyagi, Y.; Nagae, T.; Nakajima, D.; Noumi, H.; Shirotori, K.; Suzuki, Toshinori; Takahashi, T.; Takahashi, T.; Tamura, H.; Tanida, K.; Terada, N.; Toyoda, A.; Tsukada, K.; Ukai, M.; Zhou, S. H.

doi:10.1016/j.nuclphysa.2010.01.234

Cited by 18 publications

(6 citation statements)

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“…Assignments for the lower part of the spectrum, shown in Fig. 16, have been confirmed from an analysis of the three γ-rays seen following proton emission from 12 Λ C (Ma et al, 2010). The main failing of the shell-model calculation is that it does not produce high enough excitation energies for the 11 Λ B states based on the 1 + ; 0 states of 10 B at 0.72 and 2.15 MeV (Millener, 2010).…”

Section: The Effective Y N Interactionmentioning

confidence: 75%

Strangeness in nuclear physics

2016

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Section: The Effective Y N Interactionmentioning

confidence: 75%

Strangeness in nuclear physics

2016

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“…The experimental data available at the time was reviewed by Tamura in the same volume [2] and consisted of 22 γ-ray transitions in Λ C from KEK E566 using an upgraded germanium detector array, Hyperball2, have been reported at the Hyp-X conference by Tamura [3] and Ma [4]. The groundstate doublet spacing in 12 Λ C is established as 161 keV both from the direct observation of the 161 keV γ-ray and from transitions from an excited 1 − state at 2832 keV.…”

Section: Introductionmentioning

confidence: 99%

Shell-model calculations for p-shell hypernuclei

Millener

2012

Nuclear Physics A

126

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The interpretation of hypernuclear γ-ray data for p-shell hypernuclei in terms of shell-model calculations that include the coupling of Λ-and Σ-hypernuclear states is briefly reviewed. Next, 8 Λ Li/ 8 Λ Be and 9 Λ Li are considered, both to exhibit features of Λ-Σ coupling and as possible source of observed, but unassigned, hypernuclear γ rays. Then, the feasibility of measuring the ground-state doublet spacing of 10 Λ Be, which, like 9 Λ Li, could be studied via the (K − , π 0 γ) reaction, is investigated. Structural information relevant to the population of states in these hypernuclei in recent (e, e ′ K + ) studies is also given. Finally, the extension of the shell-model calculations to sd-shell hypernuclei is briefly considered.

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“…The values of E e , P E Arm , P H Arm , φ E Arm , and φ H Arm were thus the same in the productions of both 9 Λ Li and 12 Λ B and were determined by positioning the 12 Λ B ground state at its known position of 11.37 ± 0.06 MeV [31] in the binding-energy spectrum and minimizing its FWHM. When minimizing the 12 Λ B ground-state FWHM, it has to be taken into account that this ground state is actually a doublet whose energy splitting, assumed to be equal to the 12 Λ C ground-state energy splitting, is 161.6 ± 0.2 keV [34,35]. Minimizing the Λ B ground state peak FWHM produces only second order effects on the position of the peaks in the binding-energy spectrum and was peformed mainly to choose the right set of values ∆E e , ∆P E Arm , and ∆P H Arm among the ∞ 2 sets of values that produced the desired value of S. Things are much different for the reaction p(e, e ′ K + )Λ, where the target mass is small and the minimization of the FWHM of the peak (which is a single peak) plays a role as important as the positioning of the peak in the binding-energy spectrum to its zero value.…”

Section: −1mentioning

confidence: 99%

Spectroscopy ofLiΛ9by electroproduction

Urciuoli¹,

Cusanno²,

Marrone³

et al. 2015

Phys. Rev. C

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Background: In the absence of accurate data on the free two-body hyperon-nucleon interaction, the spectra of hypernuclei provides information on the details of the effective hyperon-nucleon interaction.Purpose: To obtain a high-resolution binding energy spectrum for the 9 Be(e, e ′ K + ) 9 Λ Li reaction. Method: Electroproduction of the hypernucleus 9 Λ Li has been studied for the first time with sub-MeV energy resolution in Hall A at Jefferson Lab on a 9 Be target. In order to increase the counting rate and to provide unambiguous kaon identification, two superconducting septum magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A standard equipment. Results: The cross section to low-lying states of 9 Λ Li is concentrated within 3 MeV of the ground state and can be fitted with four peaks. The positions of the doublets agree with theory while a disagreement could exist with respect to the relative strengths of the peaks in the doublets. The Λ separation energy, BΛ, of 8.36 ± 0.08 (stat.) ± 0.08 (syst.) MeV was measured, in agreement with an earlier experiment.

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Updated results on the 11ΛB and 12ΛC γ-ray spectroscopy study

Cited by 18 publications

References 6 publications

Strangeness in nuclear physics

Strangeness in nuclear physics

Shell-model calculations for p-shell hypernuclei

Spectroscopy ofLiΛ9by electroproduction

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