Publisher's Note: Kinetic energy sum spectra in nonmesonic weak decay of hypernuclei [Phys. Rev. C 78, 044312 (2008)]

Nonmesonic Weak Decay Spectra of Light Hypernuclei

“…Next, we discuss the spectra for the kinetic energy sums E ≡ E nN = E n + E N in NMWD ΛN → nN . As demonstrated by Barbero et al [25] within the IPSM these spectra contain one or more peaks, the number of which is equal to the number of shell-model orbitals 1s 1/2 , 1p 3/2 , 1p 1/2 , · · · that are either fully or partly occupied. Before including the recoil, all these peaks would be just spikes at the corresponding Q-values ∆ N .…”

“…More, we will seize the opportunity to discuss the spectra of other two light hypernuclei, namely of 4 Λ H, and 5 Λ He, taking care of measurements done on the latter at KEK [32][33][34], and FINUDA [36]. Theoretical expressions for different NM weak decay spectra within the IPSM that are used here have been presented previously [10,[25][26][27][28][29] and will not be repeated here.…”

Nonmesonic weak decay spectra of HeΛ4

“…As a consequence the NME's can be factored out of the integrals in Eq. (3) and this explains why only the transition rates, but not the normalized spectra, significantly depend on the intrinsic NMWD dynamics [24]. Notice, however, that the M's as a whole do strongly depend on P through the center-of-mass overlaps of the two-body wave functions.…”

Final state interactions effects on kinetic energy sum spectra in nonmesonic weak decay

“…It is also important to mention the new experiments planned at J-PARC where the statistics will be increased much higher and the spectra will be observed clearly [11]. Additionally, on the theoretical hand some evaluations have been performed in order to analyze the spectra [12][13][14][15][16][17][18]. Related with the coincidence nN spectra, in which we will concentrate from here on, it has been repeatedly mentioned in the literature that: i) the bump observed in the experimental S nn (E n + E n ) spectrum at low energies is not reproduced by the theory, which may be indicative of nn coincidences originated from sources other than Λn decays; and ii) differences between theoretical calculations and experimental data may be the result of final state interactions (FSI) in the np and nn channels and/or two-nucleon-induced decay mode (ΛNN → NNN).…”

“…[16] where is developed a model for the evaluation of coincidence spectra which includes, in the framework of the independent particle shell model, the effects of the recoil of the residual nucleus and of the spreading in strength of the deep-hole states on NMHD observables. There is concluded that: i) that model is the appropriate lowest-order approximation for the theoretical calculations of the kinetic energy sum spectra in NMHD, and ii) it is in comparison to that picture that one should to appraise the effects of FSI and of twonucleon-induced decay mode.…”