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Szymański, J.; Barnes, P. D.; Diebold, G. E.; Eisenstein, R. A.; Franklin, G.; Grace, Richard; Hertzog, D. W.; Maher, C.; Quinn, B.; Rieder, R.; Seydoux, J.; Wharton, W. R.; Bart, S.; Chrien, R. E.; Pile, P.; Sutter, Reto; Xu, Y.; Hackenburg, R.; Hungerford, E.; Kishimoto, T.; Tang, L.; Bassalleck, B.; Stearns, R. L.

doi:10.1103/physrevc.43.849

Cited by 141 publications

(155 citation statements)

References 44 publications

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“…The method described in the following is conceptually similar to the one used in counter experiments at fixed targets [2,3]. It consists in producing hydrogen hypernuclei in their ground state or in a low-lying excited state and in unambiguously identifying them by a kinematic tag of the occurrence of the production reaction; the hypernucleus formation time is given by a fast timing detector located as near as possible to the reaction target.…”

Section: Lifetime Measurements Feasibility Evaluationmentioning

confidence: 99%

“…To measure the K 0 momentum, the K 0 → π + π − decay reaction in a strongly asymmetric topology could be used, by determining the charged pions momenta with the SKS and a decay arm detector. In [18], a 4 Λ H production yield is estimated as: (2) with N beam =10 9 π/spill, N target =1g/cm 2 (∼7.5 cm liquid helium target),…”

Section: Lifetime Measurement At J-parcmentioning

confidence: 99%

“…In the 90's more precise measurements of the 4 Λ H lifetime were done with counter experiments at the BNL AGS with K − in flight [2] and at the KEK PS with K − at rest [3], giving respectively lifetime values of 160±20 ps and 194 +24 −26 ps. About 20 years later the interest in 3 Λ H was renewed by the observation of its production and, more importantly, of the production of its antipartner 3 Λ H in ultrarelativistic Au-Au ion collisions at RHIC by the STAR collaboration [4].…”

Section: Introductionmentioning

confidence: 99%

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On the Measurement of the Lifetime of Hydrogen Hyperisotopes at J-PARC and JLab

Botta

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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Hypernuclear hydrogen isotopes have been observed in visualizing techniques experiments in the 60's and 70's and in a few counter experiments in the 90's; very recently heavy ions collisions experiments reported the observation of 3 Λ H and of its antipartner 3 Λ H. Several of these experiments performed lifetime measurements, the values of which fall in a quite spread interval and are significantly lower than the free Λ lifetime, in apparent contrast with the few available theoretical calculations. Aiming to obtain final precise values for both 3 Λ H and 4 Λ H lifetimes, preliminary calculations are given on the feasibility of their experimental determination at two present and near future operating world facilities featuring hypernuclear physics scientific programs: J-PARC and JLab.

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Section: Lifetime Measurements Feasibility Evaluationmentioning

confidence: 99%

Section: Lifetime Measurement At J-parcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Measurement of the Lifetime of Hydrogen Hyperisotopes at J-PARC and JLab

Botta

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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“…The corresponding neutroninduced transition rates n ≡ ( n → nn) were estimated through the comparison of the measured proton spectrum with that of the intranuclear cascade (INC) calculation where the n / p ratio is treated as free parameter. This procedure signalized very large experimental n/p ratios ( ∼ =0.9-2.0) [1][2][3], in comparison with theoretical estimates ( ∼ =0.3-0.5) obtained within the one-meson-exchange potential (OMEP) [4][5][6][7][8][9][10][11]. (See, for instance, Table 3 in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The proton-induced transition rates p ≡ ( p → np) in 5 He, 11 Li, and 12 C have been determined in this way [1][2][3]. The corresponding neutroninduced transition rates n ≡ ( n → nn) were estimated through the comparison of the measured proton spectrum with that of the intranuclear cascade (INC) calculation where the n / p ratio is treated as free parameter.…”

Section: Introductionmentioning

confidence: 99%

Kinetic energy sum spectra in nonmesonic weak decay of hypernuclei

et al. 2008

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We evaluate the coincidence spectra in the nonmesonic weak decay (NMWD) N → nN of hypernuclei 4 He, 5 He, 12 C, 16 O, and 28 Si, as a function of the sum of kinetic energies E nN = E n + E N for N = n, p. The strangeness-changing transition potential is described by the one-meson-exchange model, with commonly used parametrization. Two versions of the independent-particle shell model (IPSM) are employed to account for the nuclear structure of the final residual nuclei. They are as follows: (a) IPSM-a, where no correlation, except for the Pauli principle, is taken into account and (b) IPSM-b, where the highly excited hole states are considered to be quasistationary and are described by Breit-Wigner distributions, whose widths are estimated from the experimental data. All np and nn spectra exhibit a series of peaks in the energy interval 110 MeV < E nN < 170 MeV, one for each occupied shell-model state. Within the IPSM-a, and because of the recoil effect, each peak covers an energy interval proportional to A −1 , going from ∼ =4 MeV for 28 Si to ∼ =40 MeV for 4 He. Such a description could be pretty fair for the light 4 He and 5 He hypernuclei. For the remaining, heavier, hypernuclei it is very important, however, to consider as well the spreading in strength of the deep-hole states and bring into play the IPSM-b approach. Notwithstanding the nuclear model that is employed the results depend only very weakly on the details of the dynamics involved in the decay process proper. We propose that the IPSM is the appropriate lowest-order approximation for the theoretical calculations of the of kinetic energy sum spectra in the NMWD. It is in comparison to this picture that one should appraise the effects of the final-state interactions and of the two-nucleon-induced decay mode.

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