On the effect of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi mathvariant="normal">Δ</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mn>1232</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:math> in hypernuclear non-mesonic weak decay: A microscopic approach

Bauer, E.; Garbarino, G.

doi:10.1016/j.physletb.2012.08.027

Cited by 5 publications

(9 citation statements)

References 33 publications

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“…A reasonable agreement between data and predictions have been reached for the mesonic and nonmesonic decay rates, the n / p ratio between the neutron-and the proton-induced decay widths, the 2 / NM ratio between the two-nucleon induced and the total nonmesonic rates, and the intrinsic asymmetry parameter a for the decay of polarized hypernuclei [1]. Nevertheless, discrepancies between theory and experiment are still present for the emission spectra involving protons [2][3][4].…”

Section: Introductionmentioning

confidence: 57%

“…The same microscopic approach showed that Pauli exchange and ground-state correlation contributions are very important for a detailed calculation of the rates, the asymmetry parameter, and the nucleon emission spectra in the nonmesonic weak decay of hypernuclei [3,[15][16][17]. Less pronounced effects have been reported by including the -baryon resonance in the microscopic approach [4].…”

Section: Introductionmentioning

confidence: 95%

“…Indeed, only a few doublehypernuclei events have been studied experimentally up to date. In the KEK-176 and KEK-373 experiments, 4 H, 6 He, and 10 Be have been identified, while less unambiguous events were recorded for 6 He and 10 Be in the 1960s and for 13 B in the early 1990s [5]. The observation of the so-called NAGARA event implies a weak and attractive interaction, i.e., a bond energy B ( 6 He) ≡ B ( 6 He) − 2B ( 5 He) = (0.67 ± 0.17) MeV [6].…”

Section: Introductionmentioning

confidence: 99%

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Nonmesonic weak decay of double-Λhypernuclei: A microscopic approach

Bauer

Garbarino²,

Peña

2015

Phys. Rev. C

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The nonmesonic weak decay of double-hypernuclei is studied within a microscopic diagrammatic approach. In addition to the nucleon-induced mechanism, N → nN and N N → nN N , widely studied in singlehypernuclei, additional hyperon-induced mechanisms, → n, → 0 n, and → − p, are accessible in double-hypernuclei and are investigated here. As in previous works on single-hypernuclei, we adopt a nuclear matter formalism extended to finite nuclei via the local density approximation and a one-meson exchange weak transition potential (including the ground-state pseudoscalar and vector octets mesons) supplemented by correlated and uncorrelated two-pion-exchange contributions. The weak decay rates are evaluated for hypernuclei in the region of the experimentally accessible light hypernuclei 10 Be and 13 B. Our predictions are compared with a few previous evaluations. The rate for the → n decay is dominated by K-, K * -, and η-exchange and turns out to be about 2.5% of the free decay rate, free , while the total rate for the → 0 n and → − p decays, dominated by π -exchange, amounts to about 0.25% of free . The experimental measurement of these decays would be essential for the beginning of a systematic study of the nonmesonic decay of strangeness −2 hypernuclei. This field of research could also shed light on the possible existence and nature of the H dibaryon.

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Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Nonmesonic weak decay of double-Λhypernuclei: A microscopic approach

Bauer

Garbarino²,

Peña

2015

Phys. Rev. C

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“…Beyond these improvements, there are still discrepancies between theory and experiment for the emission spectra involving protons [8][9][10]. In fact, while the neutron emission spectra are rather well reproduced by theoretical models, the same does not happen for proton spectra.…”

Section: Introductionmentioning

confidence: 98%

“…In this case, the theoretical predictions overestimate data. In order to try to understand this problem, we have developed a microscopic model, where nucleon final state interactions (FSI) and ground state correlations (GSC) can be included on the same footing in the calculation of decay widths and nucleon emission spectra (see [9,10], and references therein). In a recent contribution [10], we have explored the effect of the (1232)-baryon resonance on the nucleon emission spectra.…”

Section: Introductionmentioning

confidence: 99%

Microscopic model to nucleon spectra in hypernuclear non-mesonic weak decay

Bauer

2013

Nuclear Physics A

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Nonmesonic weak decay of Λ hypernuclei: The three-nucleon induced mode

Bauer

Garbarino²,

Peña

2017

Physics Letters B

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The nonmesonic weak decay of Λ hypernuclei is studied within a microscopic diagrammatic approach which is extended to include the three-nucleon induced mechanism. We adopt a nuclear matter formalism which, through the local density approximation, allows us to model finite hypernuclei, a one-meson-exchange weak transition potential and a Bonn nucleon-nucleon strong potential. One-, two-and three-nucleon induced weak decay rates are predicted for 12 Λ C by including ground state correlations up to second order in the nucleon-nucleon potential and the recoil of the residual nucleus. Three-nucleon stimulated decays, ΛN N N → nN N N (N = n or p), are considered here for the first time. The obtained decay rates compare well with the latest KEK and FINUDA data. The three-nucleon induced rate turns out to be dominated by nnp-and npp-induced decays, it amounts to ∼ 7% of the total nonmesonic rate and it is ∼ 1/2 of the neutron-induced decay rate. The reduction effect of the nuclear recoil is particularly relevant for the three-nucleon induced rates (∼ 15%), less important for the two-nucleon induced rates (∼ 4%) and negligible for the one-nucleon induced rates. Given the non-negligible size of the three-nucleon induced contribution and consequently its importance in the precise determination of the complete set of decay rates, new measurements and/or experimental analysis are encouraged.

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On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: A microscopic approach

Cited by 5 publications

References 33 publications

Nonmesonic weak decay of double-Λhypernuclei: A microscopic approach

Nonmesonic weak decay of double-Λhypernuclei: A microscopic approach

Microscopic model to nucleon spectra in hypernuclear non-mesonic weak decay

Nonmesonic weak decay of Λ hypernuclei: The three-nucleon induced mode

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