Exclusive Measurement of the Nonmesonic Weak Decay of ^{5}_ΛHe Hypernucleus

Details Exclusive Measurement of the Nonmesonic Weak Decay of ^{5}_ΛHe Hypernucleus Exclusive Measurement of the Nonmesonic Weak Decay of ^{5}_ΛHe Hypernucleus

2005-09-11

arxiv.org/abs/nucl-ex/0509015v2

Phys.Rev.Lett. 96 (2006) 062301

Physics

Nuclear Physics

Nuclear Experiment

Submitted to Phys. Rev. lett., 4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.062301

We performed a coincidence measurement of two nucleons emitted from the nonmesonic weak decay (NMWD) of ^{5}_{\Lambda}He formed via the ^{6}Li(\pi^+,K^+) reaction. The energies of two nucleons and the pair number distributions in the opening angle between them were measured. In both np and nn pairs, we observed a clean back-to-back correlation coming from the two-body decay of \Lambda p --> n p and \Lambda n --> n n, respectively. The ratio of the nucleon pair numbers was N_{nn}/N_{np}=0.45 \pm 0.11(stat)\pm 0.03(syst) in the kinematic region of cos(theta_{NN}) < -0.8. Since each decay mode was exclusively detected, the measured ratio should be close to the ratio of \Gamma(\Lambda p --> np)/\Gamma(\Lambda n --> nn). The ratio is consistent with recent theoretical calculations based on the heavy meson/direct quark exchange picture.

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