The non-mesonic to π− mesonic decay ratio and Λ-neutron stimulation fraction for p-shell hypernuclei

Montwill, A.; Moriarty, Philip; Davis, D. H.; Pniewski, T; Sobczak, T.; Adamovic, O.; Krecker, U.; Coremans-Bertrand, G.; Sacton, J.

doi:10.1016/0375-9474(74)90572-7

Cited by 78 publications

(14 citation statements)

References 13 publications

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“…This brief outline does not pretend to be complete. For a more rigorous analysis, we refer the reader to the experimental works [4][5][6][7][8][9][10][11][12] and also to the above mentioned studies. There are two equivalent definitions for the experimental value of Γ n /Γ p [31,32],…”

Section: The Extraction Of the Ratio γ N /γ P From Datamentioning

confidence: 99%

“…For review articles one can see [2,3]. Many theoretical and experimental [4][5][6][7][8][9][10][11][12], efforts have been developed to understand the physics beyond this decay. The two main decay mechanisms are: The mesonic decay (M), where the decay reaction is Λ → πN , that is, the Λ inside the hypernucleus decays into a pion and a nucleon.…”

Section: Introductionmentioning

confidence: 99%

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Non-mesonic weak decay of Λ hypernuclei within a nuclear matter framework

Bauer

2007

Nuclear Physics A

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The non-mesonic weak decay of Λ hypernuclei is studied using nuclear matter. We have developed a formalism which gives a microscopic interpretation of the process of emission of particles originated in this decay. More specifically, our scheme provides a unified treatment of Γ (ΛN → NN) and N N (N NN ), the Λ non-mesonic weak decay widths and the number of emitted particles (pair of particles) of kind N (NN), respectively. We have also evaluated for the first time the quantum interference terms between the n-and p-induced weak decay amplitudes. Explicit expressions for N N and N NN are shown within the ring approximation. Using the local density approximation together with the ring approximation, we report results for the decay of the 12 Λ C hypernucleus. We have obtained values for the ratio N n /N p (N nn /N np ) in the range 1.4-1.6 (0.2-0.3), where no energy threshold have been employed. The n-and p-induced interference terms modify in less than ∼ 3% these results.

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Section: The Extraction Of the Ratio γ N /γ P From Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non-mesonic weak decay of Λ hypernuclei within a nuclear matter framework

Bauer

2007

Nuclear Physics A

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“…The pionic decay of Λ hypernuclei has received attention in the past both from the experimental [1]- [7] and theoretical [8]- [22] points of view (for a recent review see Ref. [23]).…”

Section: Introductionmentioning

confidence: 99%

“…where (Gm 2 π ) 2 /8π = 1.945 × 10 −15 , the constants S and P are equal to 1.06 and 0.527 respectively and m π is the pion mass (139.57 or 134.98 MeV for π − or π 0 ), q cm is the 1 We use the notation A Λ Z, to denote a nuclear core A−1 Z and one bound Λ particle.…”

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confidence: 99%

Pionic decay of Λ hypernuclei in a continuum shell model

2003

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“…[20,21] (full (green) squares) and Ref. [22] [7], compared with previous measurements (full (black) triangles) [16][17][18][19]14] and with theoretical calculations [20,21] (full (green) squares) and [22] (full (blue) stars). See Ref.…”

Section: Measurement Of γ π − /γ λmentioning

confidence: 99%

Hypernuclear weak decay studies with FINUDA

et al. 2012

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The FINUDA experiment has recently completed an extensive study of the weak decay of p-shell Λ-hypernuclei including both mesonic and non-mesonic modes. Charged mesonic decay rates have been determined based on the analysis of π − kinetic energy spectra, never measured before. The study of proton spectra from non-mesonic weak decay for p-shell hypernuclei, both single and in coincidence with a neutron, has triggered the investigation of the two-nucleon induced ΛN N → nN N decay channel: its weight has been evaluated to be Γ 2 /Γ NM = 0.21 ± 0.07 stat +0.03 sys −0.02 sys . Finally, a direct experimental evidence of the occurrence of the weak reaction Λnp → nnp in nuclei is presented for the first time. Three events have been found which can be attributed to 7 Λ Li and 9 Λ Be two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.

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The non-mesonic to π− mesonic decay ratio and Λ-neutron stimulation fraction for p-shell hypernuclei

Cited by 78 publications

References 13 publications

Non-mesonic weak decay of Λ hypernuclei within a nuclear matter framework

Non-mesonic weak decay of Λ hypernuclei within a nuclear matter framework

Pionic decay of Λ hypernuclei in a continuum shell model

Hypernuclear weak decay studies with FINUDA

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