Coincidence Measurement of the Nonmesonic Weak Decay of ^{12}_{Lambda}C

Details Coincidence Measurement of the Nonmesonic Weak Decay of ^{12}_{Lambda}C Coincidence Measurement of the Nonmesonic Weak Decay of ^{12}_{Lambda}C

2006-01-21

arxiv.org/abs/nucl-ex/0601029v2

Phys.Lett. B641 (2006) 28-33

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 4figures, 1 table,re-submitted to Physics Letters B

Scientific paper

10.1016/j.physletb.2006.08.012

We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of ^{12}_{Lambda}C produced via the (pi^+,K^+) reaction in coincidence measurement. The Lambda p -> np and Lambda n -> nn modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers N_{nn} and N_{np}, the ratio Gamma_n/Gamma_p of the partial decay widths Gamma_n(Lambda n -> nn) and Gamma_p(Lambda p -> np) of ^{12}_{Lambda}C was extracted to be 0.51+-0.13(stat) +- 0.05(syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Gamma_n/Gamma_p ratio of ^{12}_{Lambda}C (p-shell) is close to that of ^5_{Lambda}He (s-shell). The results are consistent with those of recent theoretical calculations.

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