Results 1 - 10 of 1783
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[en] The α-condensed state in nuclear systems has been proposed by Tohsaki et al. and has given rise to interesting discussions. The Hoyle state of 12C has been studied as the most typical example of such an α-condensed state. A new resonant 03+ state (Er = 1.66 MeV, Γ = 1.48 MeV) is predicted as an excited α-condensed state in addition to the second 0+ state of the Hoyle state by calculations of the 3 α orthogonality condition model (3 α OCM) using the complex scaling method. Based on this result, the breakup strengths of the inversion reaction for sequential (8Be+α→12C+γ) and direct (α+α+α→12C+γ) processes are calculated. It is discussed that a large reaction strength calculated recently by Ogata et al. in non-resonant energies is considered as a contribution from the excited 03+ state.
[en] Parameters of the proton radiographic facility which constructed on the ITEP TWAC accelerator for diagnostic static objects and fast process are reported. Time structure of ITEP TWAC accelerator beam is able to make a diagnostic of dynamic process with characteristic speed up to 20 km/s. In paper shown that the facility spatial resolution on the sharp edge of the dense object with step up to 4.5 g/cm2 will be 8 μm with contrast factor ∼ 0.67. (author)
[en] In a kinematically complete experiment on 9Be(n,nn)8Begs at 10,3 MeV, the absolute differential cross section of the n-n FSI configuration at Θlab = 30o has been measured. It was our particular object to determine the singlet scattering length of the n-n interaction via its final-state interaction being embedded in a multi-nucleon background. An extended and thorough analysis yielded 1ann = -16,5 ± 1,0 fm which is consistent with the results of the most recent and most precise kinematically complete measurements with three hadrons in the final state. These, however, altogether contradict the values deduced from π-d → nnγ. (Authors)
[en] Two surface barrier (SB) detectors of 2 mm thickness with suitable conical collimators were placed at ± 26 degC at a distance of ∼ 4 cm from the centre of the target zone. The detector angles were chosen to optimise the detection of the two breakup α particles from 8Be following the 4+→ 2+gamma transition