Direct Observation of Sequential Weak Decay of a Double Hypernucleus

Aoki, Shigeki; Bahk, S. Y.; Chung, K.S.; Chung, S. H.; Funahashi, H.; Hahn, C.; Hara, T.; Hirata, Shuichi; Hoshino, K.; Ieiri, M.; Iijima, T.; Imai, K.; Ishigami, Takahiro; Itow, Y.; Kazuno, M.; Kikuchi, Keiji; Kim, C. O.; Kim, D. C.; Kim, J. Y.; Kobayashi, M.; Kodama, K.; Maeda, Y.; Masaike, A.; Masuoka, A.; Matsuda, Y.; Nagoshi, C.; Nakamura, Mitsuhiro; Nakanishi, S.; Nakano, Takashi; Nakazawa, Kimitaka; Niwa, K.; Oda, Hirotaka; Okabe, H.; Ono, Shunsuke; Ozaki, Ryosuke; Park, I. G.; Sato, Yoshihiro; Shibuya, H.; Shimizu, Hirohiko M.; Song, J.; Sugimoto, M.; Tajima, H.; Takashima, R.; Takéutchi, F.; Tanaka, Kenichi; Teranaka, M.; Tezuka, I.; Togawa, H.; Ushida, N.; Watanabe, Shuji; Watanabe, Toru; Yokota, J.; Yoon, C. S.

doi:10.1143/ptp.85.1287

Cited by 262 publications

(18 citation statements)

References 4 publications

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“…Hypernuclei were discovered in 1952 with the observation of a hyperfragment in a balloon-flown emulsion stack by Danysz and Pniewski [62]. Since then, more than 40 single hypernuclei, and few double [63][64][65][66][67][68][69][70] and single [71,72] ones have been identified by the use of high-energy accelerators and modern electronic counters. However, it has not been possible to prove without any ambiguity the existence of hypernuclei (see, e.g., Refs.…”

Section: Brief Overview Of Hypernuclear Physicsmentioning

confidence: 99%

Hypernuclei and massive neutron stars

et al. 2017

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Background: The recent accurate measurement of the mass of two pulsars close to or above 2 M has raised the question of whether such large pulsar masses allow for the existence of exotic degrees of freedom, such as hyperons, inside neutron stars. Purpose: In the present work, we will investigate, within a phenomenological relativistic mean field approach, how the existing hypernuclei properties may constrain the neutron star equation of state and confront the neutron star maximum masses obtained with equations of state calibrated to hypernuclei properties with the astrophysical 2 M constraint. Method: The study is performed using a relativistic mean field approach to describe both the hypernuclei and the neutron star equations of state. Unified equations of state are obtained. A set of five models that describe 2 M when only nucleonic degrees of freedom are employed. Some of these models also satisfy other well-established laboratory or theoretical constraints. Results: The-meson couplings are determined for all the models considered, and the potential in symmetric nuclear matter and matter at saturation are calculated. Maximum neutron star masses are determined for two values of the-ω meson coupling, g ω = 2g ωN /3 and g ω = g ωN , and a wide range of values for g φ. Hyperonic stars with the complete baryonic octet are studied, restricting the coupling of the and hyperons to the ω, ρ, and σ mesons due to the lack of experimental data, and maximum star masses calculated. Conclusions: We conclude that, within a phenomenological relativistic mean field approach, the currently available hypernuclei experimental data and the lack of constraints on the asymmetric equation of state of nuclear matter at high densities set only a limited number of constraints on the neutron star matter equation of state using the recent 2 M observations. It is shown that the potential in symmetric nuclear matter takes a value of ∼30−32 MeV at saturation for the g ω coupling given by the SU(6) symmetry, being of the order of the values generally used in the literature. On the other hand, the potential in matter varies between −14 and −8 MeV, taking for vector mesons couplings the SU(6) values, at variance with generally employed values between −1 and −5 MeV. If the SU(6) constraint is relaxed and the vector meson couplings to hyperons are kept to values not larger than those of nucleons, then values between −13 and +9 MeV are obtained.

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Section: Brief Overview Of Hypernuclear Physicsmentioning

confidence: 99%

Hypernuclei and massive neutron stars

et al. 2017

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“…The large scattering length of the interaction by Tominaga et al from 1998 [22] was still triggered by the first experimental information on the ground states of 6 He, 10 Be, and 13 B [2][3][4]. Those experiments suggested a separation energy of B = 4-5 MeV, where the separation energy is defined as, e.g., B = B ( 6 He) − 2B ( 5 He).…”

Section: B Analysis Of Data On the Invariant Mass From 12 C(k − K mentioning

confidence: 99%

“…The fascination was generated not least by the possible existence of the so-called H dibaryon, a deeply bound six-quark state with J = 0, isospin I = 0, and S = −2, predicted by R. Jaffe in 1977 based on a bag-model calculation [1]. The binding energies of in nuclei, deduced from sparse information on doubly strange hypernuclei [2][3][4] indicated a strongly attractive 1 S 0 interaction and seemed to be at least not inconsistent with the existence of such a bound state. The perspective changed drastically when in 2001 a new (and unambiguous) candidate for 6 He with a much lower binding energy was identified [5], the so-called Nagara event, suggesting that the interaction should be only moderately attractive.…”

Section: Introductionmentioning

confidence: 99%

Scattering lengths of strangenessS=−2baryon-baryon interactions

2012

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We reconsider a method based on dispersion theory that allows one to extract the scattering length of any two-baryon system from corresponding final-state interactions in production reactions. The application of the method to baryon-baryon systems with strangeness S = −2 and S = −3 systems is discussed. Theoretical uncertainties due to the presence of inelastic channels with near-by thresholds are examined for the specific situation of the reaction K − d → K 0 and the coupling of to the N channel. The possibility to disentangle spin-triplet and spin-singlet scattering lengths by means of various polarization measurements is demonstrated for several production reactions in K − d and γ d scattering. Employing the method to available data on the invariant mass from the reaction 12 C(K − , K + X), a 1 S 0 scattering length of a = −1.2 ± 0.6 fm is deduced.

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“…Few events of double-A hypernuclei (6AHe, ~~ and ~3B) [5,6] represent the only exception and, moreover, the experimental information is limited merely to their binding energies. The recent production of double-A hypernuclei in double strangeness exchange reactions (K-,K +) at KEK [6,7] is, however, expected to provide new additional information that will make possible to investigate qualitatively a lot of interesting problems such as the S U(3) structure of the baryon-baryon interaction or implications in existence of H dibaryon [8]. Multi-A hypernuclei with S< -3 or their more strongly bound counterparts, strangelets, can be most probably produced in relativistic heavy ion (HI) collisions [4,9].…”

Section: Introductionmentioning

confidence: 99%

Multi-strange systems in relativistic mean fields

Mareš

Žofka

1993

Z. Physik A - Hadrons and Nuclei

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Characteristics of multi-A hypernuclei are investigated within the relativistic mean-field theory. Both linear and nonlinear models and a variety of A couplings fitted to ordinary A hypernuclei have been investigated. All the parametrizations used in the present work predict qualitatively similar dependence of the studied quantities (rms radii, binding energies, densities) on a number of A hyperons.

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Direct Observation of Sequential Weak Decay of a Double Hypernucleus

Cited by 262 publications

References 4 publications

Hypernuclei and massive neutron stars

Hypernuclei and massive neutron stars

Scattering lengths of strangenessS=−2baryon-baryon interactions

Multi-strange systems in relativistic mean fields

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