On the decay mode $$^7 Be_\Lambda \to \pi ^ - + ^1 H + ^1 H + ^1 H + ^4 He$$

Davis, D.G.; Tymieniecka, T.; Jurić, M.; Krecker, U.; Kiełczewska, D.; Sacton, J.; Cantwell, T.; Montwill, A.; Moriarty, Philip

doi:10.1007/bf02787161

Cited by 2 publications

(6 citation statements)

References 3 publications

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“…For both models, the K − single-nucleon and two-nucleon absorption fractions at 0.3ρ 0 are close to 80% and 20%, respectively, and there is a tiny difference between the ratios calculated for B K − = 0 MeV and 50 MeV in the region of experimentally probed densities (gray band). Such behavior is consistent with bubble chamber data [1][2][3] as well as with findings obtained in the K − -bound state calculations with the phenomenological K − multi-nucleon potential [26]. Conversely, in Ref.…”

Section: Resultssupporting

confidence: 90%

“…Consequently, we obtain R ± = 1.9 at 0.3ρ 0 , which is close to the experimental observations [1,3]. The total two-nucleon absorption fraction amounts to 18% at 0.3ρ 0 , which compares very well with 4 He bubble chamber results [6].…”

Section: Discussionsupporting

confidence: 90%

“…The parameters of both models are fitted to low-energy K − p data such as low-energy K − p scattering cross-sections [18][19][20], threshold branching ratios [16,17] and the strong interaction energy shift and width of kaonic hydrogen atom [21]. The two models were also confronted with kaonic atom data and found to reproduce the 1N absorption fractions from bubble chamber experiments [1][2][3], after adding a phenomenological K − multi-nucleon optical potential [22].…”

Section: Kn Interaction Modelsmentioning

confidence: 99%

“…The absorption of K − on two or more nucleons represents about 20% of all K − absorptions in the surface region of atomic nuclei. The multi-nucleon absorption ratios were first measured in the 1960's and 1970's in bubble chamber experiments [1][2][3][4]. The multi-nucleon absorption fraction measured for K − capture on a mixture of C, F, and Br was found to be 0.26 ± 0.03 [1], while Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The K − N interaction is known to be attractive in the medium due to the subthreshold art chiral models fail in general to describe the data unless a purely phenomenological term representing the K − multi-nucleon interaction is added. Moreover, after applying an extra constraint to reproduce the K − single-nucleon absorption fractions from bubble chamber experiments [1][2][3], only three models, namely the Prague model (P) [11], the Kyoto-Munich model (KM) [12], and the Barcelona model (BCN) [13], were found acceptable. The K − multi-nucleon interaction is thus an inseparable part of any realistic description of the K −nucleus interaction.…”

Section: Introductionmentioning

confidence: 99%

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Single- and two-nucleon antikaon absorption in nuclear matter with chiral meson-baryon interactions

Hrtánková

Ramos

2020

Phys. Rev. C

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We have developed a microscopic model for antikaon absorption on two nucleons in nuclear matter. The absorption is described within a meson-exchange picture and the primary K − N interaction strength is derived from state-of-the-art chiral coupled channel meson-baryon interaction models. We took into account the medium modification of the K − N scattering amplitudes. We derived the K − N N as well as K − N optical potentials as functions of nuclear matter density including the real part of the K − N N potential. We calculated the K − single-and two-nucleon absorption fractions and branching ratios for various mesonic and non-mesonic channels. We have confirmed the crucial role of in-medium effects in our calculations. Our results are in very good agreement with available experimental data from old bubble chamber experiments as well as with the latest results from the AMADEUS collaboration. I = 0 resonance Λ(1405), which couples strongly to the πΣ channel giving rise to a sizable K − absorption. The theoretical description of the K − N interaction is currently provided by the chiral coupled channel meson-baryon interactions models [11][12][13][14][15] in which the Λ(1405) is generated dynamically. Parameters of these models are fitted to available low-energy K − N observables [16][17][18][19][20][21]. On the other hand, the interaction of antikaons with two and more nucleons lacks a solid theoretical description.A very important source of information about the K − -nucleus interaction is provided by kaonic atom experiments, in which the low-energy K − annihilates in the surface region of a nucleus, thereby probing the K − -nucleus potential at low nuclear densities close to threshold. The latest analysis of kaonic atom data by Friedman and Gal [22] showed that K − optical potentials based on the K − N scattering amplitudes derived from state-of-the-

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Section: Resultssupporting

confidence: 90%

Section: Discussionsupporting

confidence: 90%

Section: Kn Interaction Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single- and two-nucleon antikaon absorption in nuclear matter with chiral meson-baryon interactions

Hrtánková

Ramos

2020

Phys. Rev. C

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On the stability of Λ(1405) matter

Hrtánková

Barnea

Friedman

et al. 2019

AIP Conference Proceedings

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A hypothesis of absolutely stable strange hadronic matter composed of Λ(1405) baryons, here denoted Λ * , is tested within many-body calculations performed using the Relativistic Mean-Field approach. In our calculations, we employed the Λ * Λ * interaction compatible with the Λ * Λ * binding energy B Λ * Λ * = 40 MeV given by the phenomenological energy-independentKN interaction model by Yamazaki and Akaishi (YA). We found that the binding energy per Λ * , as well as the central density in Λ * many-body systems saturates for mass number A ≥ 120, leaving Λ * aggregates highly unstable against strong interaction decay. Moreover, we confronted the YA interaction model with kaonic atom data and found that it fails to reproduce the K − single-nucleon absorption fractions at rest from bubble chamber experiments.

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On the decay mode $$^7 Be_\Lambda \to \pi ^ - + ^1 H + ^1 H + ^1 H + ^4 He$$

Cited by 2 publications

References 3 publications

Single- and two-nucleon antikaon absorption in nuclear matter with chiral meson-baryon interactions

Single- and two-nucleon antikaon absorption in nuclear matter with chiral meson-baryon interactions

On the stability of Λ(1405) matter

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