Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

Ekawa, H.; Agari, K.; Ahn, J. K.; Akaishi, Takao; Akazawa, Y.; Ashikaga, S.; Bassalleck, B.; Bleser, S.; Endo, Yuichi; Fujikawa, Yuki; Fujioka, N.; Fujita, Masaya; Goto, R.; Han, Y.; Hasegawa, Shoichi; Hashimoto, T.; Hayakawa, Shuhei; Hayakawa, T.; Hayata, E.; Hicks, K.; Hirose, E.; Hirose, M.; Honda, Ryumon; Hoshino, K.; Hoshino, Satoshi; Hosomi, K.; Hwang, S. H.; Ichikawa, Y.; Ichikawa, M.; Ieiri, M.; Imai, K.; Inaba, K.; Ishikawa, Yuji; Iskendir, A.; Ito, H.; Ito, K.; Jung, W. S.; Kanatsuki, Shunsuke; Kanauchi, H.; Kasagi, A.; Kawai, Takeshi; Kim, M. H.; Kim, S. H.; Kinbara, Shinji; Kiuchi, R.; Kobayashi, H.; Kobayashi, Kazuya; Koike, T.; Koshikawa, A.; Lee, J. Y.; Lee, J. W.; L., T.; Matsumoto, Shota; Minakawa, M.; Miwa, K.; Moe, A. T.; Moon, Taejin; Moritsu, Manabu; Nagase, Y.; Nakada, Yasuki; Nakagawa, Mayumi; Nakashima, D.; Nakazawa, Kimitaka; Nanamura, T.; Naruki, M.; Nyaw, A. N. L.; Ogura, Y.; Ohashi, M.; Oue, K.; Ozawa, Seiji; Pochodzalla, J.; Ryu, Sun Young; Sako, H.; Sasaki, Yutaka; Sato, Susumu; Sato, Yoshihiro; Schupp, Falk; Shirotori, K.; Soe, M. M.; Soe, Myint Kyaw; Sohn, J. Y.; Sugimura, Hitoshi; Suzuki, Kazuki; Takahashi, Hajime; Takahashi, T.; Takahashi, Yasuhiro; Takeda, Tomoya; Tamura, H.; Tanida, K.; Theint, Aye Moh Moh; Tint, Khin Than; Toyama, Yuichi; Ukai, M.; Umezaki, E.; Watabe, Toyoki; Watanabe, K.; Yamamoto, T. O.; Yang, S. B.; Yoon, C. S.; Yoshida, Junya; Yoshimoto, Masahiro; Zhang, D. H.; Zhang, Z.

doi:10.1093/ptep/pty149

Cited by 49 publications

(26 citation statements)

References 19 publications

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“…Remarkably, their binding energies come out consistently in shell-model calculations [5]. Few ambiguous emulsion events from KEK [6] and J-PARC [7] have also been reported. However, and perhaps more significant is the absence of any good data on the onset of ΛΛ hypernuclear binding for A < 6.…”

Section: Pacs Numbersmentioning

confidence: 81%

The onset of ΛΛ hypernuclear binding

et al. 2019

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Binding energies of light, A ≤ 6, ΛΛ hypernuclei are calculated using the stochastic variational method in a pionless effective field theory (/ πEFT) approach at leading order with the purpose of assessing critically the onset of binding in the strangeness S = −2 hadronic sector. The / πEFT input in this sector consists of (i) a ΛΛ contact term constrained by the ΛΛ scattering length aΛΛ, using a range of values compatible with ΛΛ correlations observed in relativistic heavy ion collisions, and (ii) a ΛΛN contact term constrained by the only available A ≤ 6 ΛΛ hypernucler binding energy datum of 6 ΛΛ He. The recently debated neutral three-body and four-body systems 3 ΛΛ n and 4 ΛΛ n are found unbound by a wide margin. A relatively large value of |aΛΛ| 1.5 fm is needed to bind 4 ΛΛ H, thereby questioning its particle stability. In contrast, the particle stability of the A = 5 ΛΛ hypernuclear isodoublet 5 ΛΛ H-5 ΛΛ He is robust, with Λ separation energy of order 1 MeV. PACS numbers: Introduction. Single-Λ and double-Λ (ΛΛ) hypernuclei provide a unique extension of nuclear physics into strange hadronic matter [1]. Whereas the behavior of a single Λ hyperon in atomic nuclei has been deduced quantitatively by studying Λ hypernuclei ( A Λ Z) from A=3 to 208 [2], only three ΛΛ hypernuclei ( A ΛΛ Z) are firmly established: the lightest known 6 ΛΛ He Nagara event [3] and two heavier ones, 10 ΛΛ Be and 13 ΛΛ B [4]. Remarkably, their binding energies come out consistently in shell-model calculations [5]. Few ambiguous emulsion events from KEK [6] and J- PARC [7] have also been reported. However, and perhaps more significant is the absence of any good data on the onset of ΛΛ hypernuclear binding for A < 6. In distinction from the heavier species, these very light s-shell species, if bound, could be more affected by microscopic strangeness S = −2 dynamics. An obvious issue is the effect of a possible ΞN dominated H dibaryon resonance some 20-30 MeV above the ΛΛ threshold [8,9] on ΛΛ hypernuclear binding in general.Several calculations of light A < 6 s-shell ΛΛ hypernuclei using ΛΛ interactions fitted to 6 ΛΛ He suggest a fairly weak ΛΛ interaction, with the onset of ΛΛ hypernuclear binding defered to A = 4. Indeed, a slightly bound I = 0

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Section: Pacs Numbersmentioning

confidence: 81%

The onset of ΛΛ hypernuclear binding

et al. 2019

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“…To describe the multi-Λ nucleus, we use a meson-exchange model with non-linear couplings for RMF theory. The La- [3,4,9] are also listed. Note that the values of BΛΛ and ∆BΛΛ for 6 2Λ He from Ref.…”

Section: Model and Numerical Detailsmentioning

confidence: 99%

“…(1) fitted only to a single-Λ nucleus. More of new data from the ongoing analyses of J-PARC E-07 experiment are awaited [9,10].…”

Section: Model and Numerical Detailsmentioning

confidence: 99%

“…The set of non-linear equations, Eqs. (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20), are solved self-consistently. In our numerical calculations, the singleparticle wave functions are represented on 3-dimensional lattice in the real space [52].…”

Section: Model and Numerical Detailsmentioning

confidence: 99%

“…The main strategy is to produce hyperon(s) in an ordinary nucleus via (K − , π − ), (π + , K + ), (e, e K + ), or (K − , K + ) reactions to extract information on the interactions [1][2][3][4]. Most of the experimental data are limited to single-Λ hypernuclei, and there are also a few data for double-Λ and Ξ nuclei [3][4][5][6][7][8][9][10]. Double-Λ hypernuclei are of special importance since it provides information of hyperon-hyperon interaction.…”

Section: Introductionmentioning

confidence: 99%

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Clusterization and deformation of multi- Λ hypernuclei within a relativistic mean-field model

Tanimura

2019

Phys. Rev. C

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Deformed multi-Λ hypernuclei are studied within a relativistic mean-field model. In this paper, we take some N = Z "hyper isotope" chains, i.e., 8+n nΛ Be, 20+n nΛ Ne, and 28+n nΛ Si systems where n = 2, 4 for Be, and n = 2, 8 for Ne and Si. A sign of two-6 2Λ He cluster structure is observed in the two-body correlation in 12 4Λ Be. In the Ne hyper isotopes, the deformation is slightly reduced by addition of Λ hyperons whereas it is significantly reduced or even disappears in the Si hyper isotopes.

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