The quenching of nucleon yields in the nonmesonic weak decay of Λ -hypernuclei and the three-body weak decay process

Bhang, H.; Ajimura, S.; Aoki, Kazuo; Banu, A.; Fukuda, T.; Hashimoto, Osamu; Hwang, J. I.; Kameoka, S.; Kang, B. H.; Kim, E. H.; Kim, J. H.; Kim, M.; 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.; Shin, Sujin; Takahashi, T.; Tamura, H.; Tanida, K.; Toyota, Azumao; Tsukada, K.; Watanabe, T.; Yim, H.

doi:10.1140/epja/i2007-10470-x

Cited by 32 publications

(34 citation statements)

References 12 publications

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“…One has to mention as well that the KEK group has measured the nN distributions of the sums of kinetic energies in 5 Λ He [33,35]. But we can not compare quantitatively their results with our calculations, since in their work the number of measured pairs are not normalized to the number of NM decays N N M .…”

Section: Resultsmentioning

confidence: 88%

“…As can be see the results coming from different spectra differ considerably, and the answer to these discrepancies must come from the experimental side. For the sake of completeness in the same table we also show the values of the "bared transitions rates", which were extracted from the experimental data [31,34,35] excluding the effects of both the 2N -NM decay, and the FSIs.…”

Section: Resultsmentioning

confidence: 99%

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Nonmesonic Weak Decay Spectra of Light Hypernuclei

Krmpotić

2014

Few-Body Syst

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The nonmesonic weak decay spectra of light hypernuclei have been evaluated in a systematic way. As theoretical framework we adopt the independent particle shell model with three different one-meson-exchange transition potentials. Good agreement with data is obtained for proton and neutron kinetic energy spectra of 4 Λ He, and 5 Λ He, when the recoil effect is considered. The coincidence spectra of proton-neutron pairs are also accounted for quite reasonably, but it was not possible to reproduce the data for the neutron-neutron pair spectra. It is suggested that the π + K meson-exchange model with soft monopole form factors could be a good starting point for describing the dynamics responsible for the decays of these two hypernuclei. The 4 Λ H spectra are also presented.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Nonmesonic Weak Decay Spectra of Light Hypernuclei

Krmpotić

2014

Few-Body Syst

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“…Our data seem to agree with the hypothesis of a substantial contribution of the two-nucleon induced NMWD. Indeed recently Bhang et al [23] suggested a contribution of the two-nucleon induced weak decay process as large as 40% of the total NMWD width for 12 Λ C. However, in order to strengthen this conclusion, there is an urgent need for more data on more medium-A nuclei with much more statistics.…”

Section: Discussion Of Results and Conclusionmentioning

confidence: 99%

Measurement of the proton spectra from non-mesonic weak decay of 5ΛHe, 7ΛLi and 12ΛC

et al. 2008

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The results of a measurement of the proton spectra following the Non-Mesonic Weak Decay of 5 Λ He, 7 Λ Li and 12 Λ C are presented and discussed. The experiment was performed at the (e + e − ) collider DAΦNE at Laboratori Nazionale di Frascati of INFN.It is the first measurement for 7 Λ Li, and for all the spectra the lower limit on the energy of the protons is 15 MeV, never reached before. All the spectra show a similar shape, namely a peak at around 80 MeV as expected for the free Λp → np weak reaction, with a low energy rise that should be due to Final State Interactions and/or two-nucleon induced weak processes. The decay spectrum of 5 Λ He is somehow similar to the ones reported by previous measurements and theoretical calculations, but the same doesn't happen for the 12 Λ C one.

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“…[3,4,5,6], and 2) the first measurements of the two-particle-coincidence spectra as a function of the sum of kinetic energies E n + E N ≡ E, S nN (E), and of the opening angle θ nN ≡ θ, S nN (cos θ), done in Refs. [6,7,8,9,10,11].…”

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confidence: 99%