Three-Body Nonmesonic Weak Decay of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="bold">C</mml:mi><mml:mprescripts /><mml:mi>Λ</mml:mi><mml:mn>12</mml:mn></mml:mmultiscripts></mml:math>Hypernucleus

Kim, M.; Ajimura, S.; Aoki, Kazuo; Banu, A.; Bhang, H.; Fukuda, T.; Hashimoto, Osamu; Hwang, J. I.; Kameoka, S.; Kang, B. H.; Kim, E.; Kim, J. H.; Maruta, T.; Miura, Y.; Miyake, Yasuhiro; Nagae, T.; Nakamura, Makoto; Nakamura, S. N.; Noumi, H.; Okada, S.; Okayasu, Y.; Outa, H.; Park, H.; Saha, Pranab; Sato, Y.; Sekimoto, M.; Takahashi, T.; Tamura, H.; Tanida, K.; Toyoda, A.; Tshoo, K.; Tsukada, K.; Watanabe, T.; Yim, H.

doi:10.1103/physrevlett.103.182502

Cited by 40 publications

(17 citation statements)

References 19 publications

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“…However, it is the same which leads to a good description of experimental emission spectra involving only neutrons and an overestimation of data on spectra involving at least one proton. This is proved by the comparison of all the theoretical approaches [19][20][21] to the single-and double-coincidence nucleon emission distributions with the corresponding KEK [32] and FINUDA [33] data. These nucleon spectra are the real observables in nonmesonic decay, while the experimental values of the partial decay rates n , p , etc., are obtained after a deconvolution of the FSI effects contained in the measured spectra.…”

Section: A Nonmesonic Decay Ratesmentioning

confidence: 85%

Microscopic approach to the proton asymmetry in the nonmesonic weak decay ofΛhypernuclei

et al. 2012

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The nonmesonic weak decay of polarized hypernuclei is studied with a microscopic diagrammatic formalism in which one-and two-nucleon-induced decay mechanisms, N → NN and N N → NNN, are considered together with (and on the same ground of) nucleon final state interactions. We adopt a nuclear matter formalism extended to finite nuclei via the local density approximation. Our approach adopts different one-meson-exchange weak transition potentials, while the strong interaction effects are accounted for by a Bonn nucleon-nucleon interaction. We also consider the two-pion-exchange effect in the weak transition potential. Both the twonucleon-induced decay mechanism and the final state interactions reduce the magnitude of the asymmetry. The quantum interference terms considered in the present microscopic approach give rise to an opposite behavior of the asymmetry with increasing energy cuts to that observed in models describing the nucleon final state interactions semiclassically via the intranuclear cascade code. Our results for the asymmetry parameter in 12 C obtained with different potential models are consistent with the asymmetry measured at KEK.

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Section: A Nonmesonic Decay Ratesmentioning

confidence: 85%

Microscopic approach to the proton asymmetry in the nonmesonic weak decay ofΛhypernuclei

et al. 2012

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“…An important observable of the nonmesonic decay of hypernuclei is the ratio of the neutron-induced (Λn → nn) over the proton-induced (Λp → np) decay rate, labelled as Γ n /Γ p . The experimental ratios had been reported to be close or greater than unity, indicating the dominance of the neutron-induced channel, while the theoretical ratios based on one-meson-exchange model were as small as 0.1 [264]. This puzzle has been solved recently through the progress made in theoretical and experimental works by well taking account of the final state interaction and the three-body process (ΛN N → nN N ) [264].…”

Section: Experimental Detectionmentioning

confidence: 99%

Strangeness in nuclei and neutron stars

Tolós

Fabbietti

2020

Progress in Particle and Nuclear Physics

173

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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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“…Exp. =−0.150 =−0.300 =−0.325 [8,9] exp NM = 0.940 ± 0.035 [36] 0.828 ± 0.056 +0.066 −0.066 [38] Here we remember the following facts. In the course of the derivation of the effective twobody potentials, the weak three-body interactions with particular MPE such as (πσ )-, (πω)-, and (σ σ )-pair exchanges and the Fujita-Miyazawa (ππ) exchange are found to contribute appreciably to the effective potentials.…”

Section: Results and Discussion 61 Hypernuclear And Nuclear Wave Func...mentioning

confidence: 85%

“…They considered and analyzed that the quenching phenomenon could be caused by the two-nucleon induced three-body process as NN → NNN and FSI. They obtained the two-nucleon induced decay rate 2N = 0.27 ± 0.13 ( 2N / NM = 0.29 ± 0.13 ) for 12 C [8,9]. is a free decay rate.…”

Section: Introductionmentioning

confidence: 99%

Effective two-body ΛN → NN weak potentials deduced from three-body ΛNN → NNN interactions and hypernuclear non-mesonic weak decay rates

Itonaga

Motoba

Rijken

2022

Progress of Theoretical and Experimental Physics

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We intend to study the role of three-body weak ΛNN → NNN interaction in the two-nucleon induced hypernuclear non-mesonic weak decay. The three-body weak interactions are constructed on the basis of the Meson Pair Exchange (MPE) model and then we derive the effective two-body ΛN → NN weak potentials from the three-body interactions based on the Loiseau-Nogami-Ross (LNR) approximation. The strong coupling constants of MPE are taken from Nijmegen ESC and GESC models and the weak ones of MPE are evaluated in the weak Λ-n mixing model by Dalitz and von Hippel. The effective two-body ΛN → NN weak potentials are applied to evaluate hypernuclear non-mesonic decay rates, which we should give certain additional contribution to the two-nucleon induced decay rate Γ2N. Calculations of $\Gamma ^{(eff.2B)}_{nm}$ are done for $^5_\Lambda {\rm He}$, $^{11}_\Lambda {\rm B}$, and $^{12}_\Lambda {\rm C}$ and the results are compared with experimental data $\Gamma ^{exp}_{2N}$. We have demonstrated a possibility to account for the two-nucleon induced non-mesonic decays of light- and p-shell hypernuclei by introducing the effective two-body potentials deduced from the three-body weak interactions, though the calculated $\Gamma ^{(eff.2B)}_{nm}$ still includes uncertainties. Discussions and limitations of our ”effective two-body ΛN → NN model” are given.

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Three-Body Nonmesonic Weak Decay of theCΛ12Hypernucleus

Cited by 40 publications

References 19 publications

Microscopic approach to the proton asymmetry in the nonmesonic weak decay ofΛhypernuclei

Microscopic approach to the proton asymmetry in the nonmesonic weak decay ofΛhypernuclei

Strangeness in nuclei and neutron stars

Effective two-body ΛN → NN weak potentials deduced from three-body ΛNN → NNN interactions and hypernuclear non-mesonic weak decay rates

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