Double-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Λ</mml:mi></mml:math>hypernuclei observed in a hybrid emulsion experiment

Ahn, J. K.; Akikawa, H.; Aoki, Shigeki; Arai, K.; Bahk, S. Y.; Baik, K. M.; Bassalleck, B.; Chung, J. H.; Chung, M.; Davis, D. H.; Fukuda, T.; Hoshino, K.; Ichikawa, A. K.; Ieiri, M.; Imai, K.; Itonaga, K.; Iwata, Yoshiyuki; Iwata, Y. S.; Kanda, H.; Kaneko, M.; Kawai, Takeshi; Kawasaki, M.; Kim, C. O.; Kim, J. Y.; Kim, S. H.; Kim, S. J.; Kondō, Y.; Kouketsu, T.; Kyaw, H. N.; Lee, Y. L.; McNabb, J. W.; Min, Aye Aye; Mitsuhara, Manabu; Miwa, K.; Nakazawa, Kimitaka; Nagase, Y.; Nagoshi, C.; Nakanishi, Y.; Noumi, H.; Ogawa, S.; Okabe, H.; Oyama, K.; Park, B. D.; Park, H. M.; Park, I. G.; Parker, Joseph D.; S., Y.; Rhee, J. T.; Rusek, A.; Sawa, Arisa; Shibuya, H.; Sim, K. S.; Saha, Pranab; Seki, Daikichi; Sekimoto, M.; Song, J.; Takahashi, Hajime; Takahashi, T.; Takéutchi, F.; Tanaka, Hiroki; Tanida, K.; Tint, Khin Than; Tojo, J.; Torii, H.; Torikai, S.; Tovee, D.N.; Tsunemi, T.; Ukai, M.; Ushida, N.; Wint, Thida; Yamamoto, K.; Yasuda, N.; Yang, Jing; Yoon, C. J.; Yoon, C. S.; Yosoi, M.; Yoshida, T.; Zhu, Lei

doi:10.1103/physrevc.88.014003

Cited by 133 publications

(100 citation statements)

References 28 publications

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“…Among the several double-Λ hypernuclei so far reported in emulsion experiments [276][277][278][279], the clearest evidence was shown by the NAGARA event discovered by the KEK-PS E373 experiment [279]. In this work, the 6 ΛΛ He state was identified unambiguously in the reaction Ξ − + 12 C → 6 ΛΛ He + 4 He + t; 6 ΛΛ He → 5 Λ He + p + π − , and the value of ∆B ΛΛ ( 6 ΛΛ He) = 0.67 ± 0.17 MeV was determined [280]. The assignment of this event to a double-Λ hypernucleus is unique, because all the involved hypernuclei have no particle-stable excited states.…”

Section: Experimental Detectionmentioning

confidence: 65%

Strangeness in nuclei and neutron stars

Tolós

Fabbietti

2020

Progress in Particle and Nuclear Physics

188

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We review the present status of the experimental and theoretical developments in the field of strangeness in nuclei and neutron stars. We start by discussing theKN interaction, that is governed by the presence of the Λ(1405). We continue by showing the two-pole nature of the Λ(1405), and the production mechanisms in photon-, pion-, kaon-induced reactions as well as proton-proton collisions, while discussing the formation ofKN N bound states. We then move to the theoretical and experimental analysis of the properties of kaons and antikaons in dense nuclear matter, paying a special attention to kaonic atoms and the analysis of strangeness creation and propagation in nuclear collisions. Next, we examine the φ meson and the advances in photoproduction, protoninduced and pion-induced reactions, so as to understand its properties in dense matter. Finally, we address the dynamics of hyperons with nucleons and nuclear matter, and the connection to the phases of dense matter with strangeness in the interior of neutron stars.

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Section: Experimental Detectionmentioning

confidence: 65%

Strangeness in nuclei and neutron stars

Tolós

Fabbietti

2020

Progress in Particle and Nuclear Physics

188

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“…We finally note that the coupling of the f meson to the Λ baryon is reduced by 20% with respect to its SU(3) value in order to obtain a ΛΛ bond energy in Λ matter at a density n Λ ;n 0 /5 of D = LL B n 5 0.67MeV 0 ( ) , thereby reproducing the Nagara event (Ahn et al 2013).…”

Section: Hyperons and Magnetic Fieldmentioning

confidence: 80%

Equation of State for Nucleonic and Hyperonic Neutron Stars With Mass and Radius Constraints

Tolós

Centelles

Ramos

2016

ApJ

111

117

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We obtain a new equation of state for the nucleonic and hyperonic inner core of neutron stars that fulfils the 2 M e observations as well as the recent determinations of stellar radii below 13 km. The nucleonic equation of state is obtained from a new parameterization of the FSU2 relativistic mean-field functional that satisfies these latest astrophysical constraints and, at the same time, reproduces the properties of nuclear matter and finite nuclei while fulfilling the restrictions on high-density matter deduced from heavy-ion collisions. On the one hand, the equation of state of neutron star matter is softened around saturation density, which increases the compactness of canonical neutron stars leading to stellar radii below 13 km. On the other hand, the equation of state is stiff enough at higher densities to fulfil the 2 M e limit. By a slight modification of the parameterization, we also find that the constraints of 2 M e neutron stars with radii around 13 km are satisfied when hyperons are considered. The inclusion of the high magnetic fields present in magnetars further stiffens the equation of state. Hyperonic magnetars with magnetic fields in the surface of ∼10 15 G and with values of ∼10 18 G in the interior can reach maximum masses of 2 M e with radii in the 12-13 km range.

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“…Although the first observation of 6 He was reported in 1960s [1], there have been only a few reports on this light hypernucleus [2,3]. Among them, a track of 6 He was clearly caught in an emulsion experiment of the KEK-E373 Collaboration [3], now known as the "NAGARA" event, and the two-separation energy B of 6 He is estimated as B = 6.93 ± 0.16 MeV after being averaged with that from the "MIKAGE" event [4,5]. This would be essential information to study the interaction.…”

mentioning

confidence: 99%

HeΛΛ6in cluster effective field theory

Ando

2014

Phys. Rev. C

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The hypernucleus 6 He is studied as a three-body ( α) cluster system in cluster effective field theory at leading order. We find that the three-body contact interaction exhibits the limit cycle when the cutoff in the integral equations is sent to the asymptotic limit and thus it should be promoted to leading order. We also derive a determination equation of the limit cycle which reproduces the numerically obtained limit cycle. We then study the correlations between the double separation energy B of 6 He and the scattering length a of the S-wave scattering. The role of the scale in this approach is also discussed.Although the first observation of 6 He was reported in 1960s [1], there have been only a few reports on this light hypernucleus [2,3]. Among them, a track of 6 He was clearly caught in an emulsion experiment of the KEK-E373 Collaboration [3], now known as the "NAGARA" event, and the two-separation energy B of 6 He is estimated as B = 6.93 ± 0.16 MeV after being averaged with that from the "MIKAGE" event [4,5]. This would be essential information to study the interaction. On the other hand, theoretical studies for double hypernuclei mainly aim at extracting information on baryon-baryon interactions in the strangeness sector and searching for new exotic systems for which the value of B of 6 He plays an important role [6,7]. Theoretical studies on 6 He have been reported with various issues [8][9][10][11][12], primarily employing the three-body ( α) cluster model. One of those issues is the role of the mixing of the N channel in the interaction which is triggered by the small mass difference, about 23 MeV, between N and[11]. Effective field theories at very low energies are expected to provide a model-independent and systematic perturbative method where one introduces a high momentum separation scale H between relevant degrees of freedom in low energy and irrelevant degrees of freedom in high energy for the system in question. Then one constructs an effective Lagrangian expanded in terms of the number of derivatives order by order. Coupling constants appearing in the effective Lagrangian should be determined from available experimental or empirical data. For a review, see, e.g., Refs. [13,14] and references therein. In the previous publication [15], we studied 4 H, a bound state of a light double hypernucleus, and the S-wave scattering of and 3 H below the hypertriton breakup threshold by treating 4 H as a three-body ( --deuteron) system in cluster effective field theory (EFT) at leading order (LO).In this work, we apply this approach to study the structure of 6 He as a three-body ( α) cluster system. For this * sando@sunmoon.ac.kr † yohphy@knu.ac.kr purpose, we treat the α particle field as an elementary field. The binding energy of the α particle is B 4 28.3 MeV and its first excited state has the quantum numbers (J π = 0 + ,I = 0) and the excitation energy of E 1 20.0 MeV, which is between the energy gap of 3 H-p (19.8 MeV) from the ground state energy and that of 3 He-n (20.6 MeV). Thus the large momentu...

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Double-Λhypernuclei observed in a hybrid emulsion experiment

Cited by 133 publications

References 28 publications

Strangeness in nuclei and neutron stars

Strangeness in nuclei and neutron stars

Equation of State for Nucleonic and Hyperonic Neutron Stars With Mass and Radius Constraints

HeΛΛ6in cluster effective field theory

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