Angular distributions for the $^{124}\mathrm{Sn}(p, t)$ reaction to low-lying ${3}^{\ensuremath{-}}$, ${4}^{+}$, ${5}^{\ensuremath{-}}$, ${6}^{+}$, ${7}^{\ensuremath{-}}$, ${8}^{+}$, and ${10}^{+}$ two-quasiparticle states of $^{122}\mathrm{Sn}$ were measured at ${E}_{p}=34.9, 45.1, 54.7, \mathrm{and} 65.0$ MeV and analyzed with zero-range distorted-wave Born approximation theory. The shapes of the angular distributions are reasonably well reproduced with the zero-range theory using one average optical potential set and the deduced enhancement factors are almost constant with smoothly decreasing zero-range normalization constants as a function of the incident energy.NUCLEAR REACTIONS $^{124}\mathrm{Sn}(p, t)$, ${E}_{p}=34.9, 45.1, 54.7, \mathrm{and} 65.0$ MeV; measured $\ensuremath{\sigma}({E}_{t}, \ensuremath{\theta})$ absolute. DWBA analysis, zero-range, energy dependence of enhancement factors. Enriched target.
Angular distributions of $^{124}\mathrm{Sn}$($p$,$t$) reactions to low-lying states of $^{122}\mathrm{Sn}$ were measured at ${E}_{p}=34.9, 45.1, 54.7, \mathrm{and} 65.0$ MeV and analyzed with zero-range distorted-wave Born approximation theory. It is found that the zero-range normalization constant ${D}_{0}^{2}$ is smoothly decreasing as a function of the incident proton energy in the several tens of MeV region of bombarding energy.NUCLEAR REACTIONS $^{124}\mathrm{Sn}$($p$,$t$), $E=34.9, 45.1, 54.7, \mathrm{and} 65.0$ MeV; measured (${E}_{t}$, ${\ensuremath{\theta}}_{t}$); DWBA analysis; deduced zero-range normalization factor.
We propose a mitigation technique of high-level multiple access interference(MAI) for multimedia optical Code- Division Multiple-Access(CDMA) systems using the optical power selector. The proposed system can eliminate high-intensity MAI at the receiver for the low-priority users. Moreover, the proposed scheme can reduce by half the required number of code sequences compared to the conventional scheme. As a result, the proposed scheme can obtain higher code spreading gain due to the increase of number of weights at the same code-length. We analyze performances of the proposed scheme and show that both the high-priority users and low-priority users achieve lower bit error rates in comparison to the conventional scheme.
In optical atmospheric (OA) pulse position modulation (PPM) code division multiple access (CDMA) systems, the conventional scheme which applies the maximum-value detection has a serious problem that the multiple access interferences (MAIs) become large due to scintillations. In this paper, to mitigate both effects of scintillations and MAIs, we propose a symbol decision scheme by using the comparing detection. In our proposed scheme, the minimum output in all weighted positions is detected in each PPM slot. Then, the maximum-value out of the minimum outputs is detected, and, the symbol corresponding to the PPM slot in which the output has the maximum-value is decided. Since the received symbol is correctly decided as long as there is at least one weighted position without MAIs in other PPM slots, the proposed scheme can mitigate both effects of MAIs and scintillations. We show that the proposed scheme can improve the bit error rate performance
In this paper, we propose a mitigation system of high-level multiple access interference (MAI) for multimedia optical Code-Division Multiple-Access (CDMA) systems using the optical power selector (OPS). The proposed system can eliminate high-intensity MAI at the receiver for low-priority users. Moreover, the proposed system can reduce by half the required number of code sequences compared to the conventional scheme. As a result, the proposed system can increase the number of weights at the same code-length and, thus, obtain higher code spreading gain. We analyze performances of the proposed system and show that both high-priority users and low-priority users achieve lower bit error rates in comparison to the conventional scheme.
