Polarization and weak decays of Λ hypernuclei produced by the (π+, K+) reaction on 12C

Hypernuclear weak decay ofCΛ12andBNoumi1, Ajimura2, Ejiri3 et al. 1995Phys. Rev. CSelf Cite8661380View full textAdd to dashboardCite

“…06~0.34)I A in~'B from the Q given by Montwill et al [21] employing Eqs. (9) and (10). The present results concerning I "show almost unity in units of I A, and agree well with the previous measurements.…”

“…a goal of the PS E160 experiment. This has already been reported elsewhere [10]. The nuclear effects modify the angular distribution and attenuate the asymmetry.…”

“…The present results for I"are summarized in Table III, [22] BNL [8] Montwill et al [21] Free (10) as assumed in Ref. [20].…”

Asymmetry parameter for the nonmesonic decay of 5<FONT FACE=Symbol>L</font>He

“…It is experimentally extracted from measurements of the angular distribution of the emitted protons in the nonmesonic decay of polarized hypernuclei. There are large discrepancies, both experimentally and theoretically, in the determination of a Λ [1], specially after the newest experimental results for the decay of 5 Λ He [3] giving a positive value for this observable, differently from previous measurements based on the decay of 12 Λ C [4], which would be expected to yield approximately the same result (see below). In strong disagreement with the new measurement, all calculations so far fi nd a negative value for a Λ , which makes the investigation of this observable particularly relevant.…”

Asymmetry in the Nonmesonic Weak Decay of PolarizedΛ5HeHypernuclei

“…Recently, the experiment (E160) at the KEK 12-GeV proton synchrotron (KEK-PS) measured the NM decay of 12 L C and 11 L B, and demonstrated a large asymmetry parameter of a NM 21.0 6 0.4 [2]. In that experiment, the following conditions prevailed: (1) The polarization of hypernuclei was theoretically calculated; the depolarization due to the particle and g decays had to be taken into account along with an assumption concerning the hypernuclear structure [3].…”