Alpha-cluster states in 18O

First observation ofα-cluster states in the14O + 4Fu1, Goldberg2, Rogachev3 et al. 2008Phys. Rev. CSelf Cite

“…The main difference was that the large square particle detectors, which consisted of four 25 mm × 25mm × 1 mm Si detectors, were placed along the back wall of the scattering chamber, which was filled with helium. This increased the available distance to stop the 14 O ions before the detectors, allowing a lower gas pressure to be used in the scattering chamber. In turn, this provided for better particle identification by using the time-of-flight method, as described in [11].…”

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We measured 14 O + 4 He excitation functions for elastic scattering which demonstrate, for the first time, a well developed α-cluster structure in the proton rich nucleus, 18 Ne. We present the excitation energies and estimates of the spins for the dominant resonances using an R-matrix approach.

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“…For many systems, the information needed to understand this can be obtained only in the reactions induced by radioactive beams. This paper presents the first results on α-cluster states in 18 Ne from the resonant interaction of a radioactive 14 O beam with 4 He. The specific measurements were made with the knowledge that very detailed data have been obtained on 14 C + 4 He resonance scattering, and one can expect the results of the analysis soon [9].…”

“…This paper presents the first results on α-cluster states in 18 Ne from the resonant interaction of a radioactive 14 O beam with 4 He. The specific measurements were made with the knowledge that very detailed data have been obtained on 14 C + 4 He resonance scattering, and one can expect the results of the analysis soon [9]. The 14 O beam was obtained at the Texas A&M University Cyclotron Institute, using the recoil spectrometer MARS [10] and a primary 14 N beam impinging on a H 2 gas target cooled to liquid nitrogen temperature (see [11] for a more detailed description).…”

“…The 14 O beam was obtained at the Texas A&M University Cyclotron Institute, using the recoil spectrometer MARS [10] and a primary 14 N beam impinging on a H 2 gas target cooled to liquid nitrogen temperature (see [11] for a more detailed description). The measurement of the 14 elastic-scattering excitation function was carried out using the thick target inverse kinematics (TTIK) method [12]. The TTIK method allows for the possibility to obtain a continuous excitation function from the initial energy down to the lowest detectable energy.…”