Weak Decays of Hypernuclei

Parreño, A.

doi:10.1007/978-3-540-72039-3_5

Cited by 21 publications

(21 citation statements)

References 76 publications

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“…The spin summation for this diagram is performed for all particles except for the , which is assumed to have spin up. This summation 2 Note that the proton-induced decay rate is obtained as p =…”

Section: <↑mentioning

confidence: 99%

“…In particular, the nonmesonic weak decay of hypernuclei has shown two challenging issues presenting some puzzling character [1,2]. First, we must mention the disagreement between theory and experiment for the ratio n / p between the rates for the n → nn and the p → np nonmesonic weak decay processes.…”

Section: Introductionmentioning

confidence: 99%

“…Let us denote with a 1N the intrinsic asymmetry, arising from the one-nucleon-induced (1N ) decay in Eq. (2). The one-nucleon-induced decays take place within the nuclear environment and the resulting nucleon pairs can interact strongly with other nucleons of the medium before any nucleon leaves the nucleus and is detected.…”

Section: Introductionmentioning

confidence: 99%

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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: <↑mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2012

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“…Two comprehensive reviews on the theoretical aspects of hypernuclear weak decay can be found in Refs. [135,136] for the interested reader. non-mesonic decay rate (see Eqs.…”

Section: Weak Decay Of Single λ-Hypernucleimentioning

confidence: 99%

Hyperons: the strange ingredients of the nuclear equation of state

Vidaña

2018

Proc. R. Soc. A.

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In this article we will review the role and properties of hyperons in finite and infinite nuclear systems. In particular, we will revise different production mechanisms of hypernuclei, as well as several aspects of hypernuclear γ-ray spectroscopy, and the weak decay modes of hypernuclei. Then we will discuss the construction of hyperon-nucleon and hyperon-hyperon interactions on the basis of the meson-exchange and chiral effective field theories. Recent developments based on the socalled V low k approach and lattice QCD will also be adressed. Finally, we will go over some of the effects of hyperons on the properties of neutron and proto-neutron stars with an emphasis on the so-called "hyperon puzzle", i.e., the problem of the strong softening of the equation of state, and the consequent reduction of the maximum mass, induced by the presence of hyperons, a problem which has become more intringuing and difficult to solve due the recent measurements of ∼ 2M millisecond pulsars. We will discuss some of the solutions proposed to tackle this problem. We will also re-examine the role of hyperons on the cooling properties of newly born neutron stars and on the development of the so-called r-mode instability.

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“…Some decay modes of the Λ hyperon in nuclei have already been studied, of course. The mesonic and non-mesonic decay rates in 5 He, 12 C and various other nuclei have been studied at BNL, KEK and DAFNE and theoretical calculations for those decay rates have been performed within a meson exchange picture [23,24,25]. However, there has so far been neither a calculation nor a measurement of the betadecay of Λ hypernuclei.…”

Section: Introductionmentioning

confidence: 99%

Lambda beta-decay in-medium

Guichon

Thomas

2017

Physics Letters B

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Under the working hypothesis that the structure of a bound hadron is modified by its interactions with other hadrons, one may expect to see changes in carefully chosen observables. In the light of a recent proposal to measure the axial charge in the strangeness changing beta-decay of a bound Lambda hyperon, we examine the size of the change expected within the quark-meson coupling model. It is predicted to be significant

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Weak Decays of Hypernuclei

Cited by 21 publications

References 76 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

Hyperons: the strange ingredients of the nuclear equation of state

Lambda beta-decay in-medium

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