Clarification of the three-body decay of 12C (12.71 MeV).
نویسندگان
چکیده
Using beta decays of a clean source of 12N produced at the IGISOL facility, we have measured the breakup of the 12C (12.71 MeV) state into three alpha particles with a segmented particle detector setup. The high quality of the data permits solving the question of the breakup mechanism of the 12.71 MeV state, a longstanding problem in few-body nuclear physics. Among existing models, a modified sequential model fits the data best, but systematic deviations indicate that a three-body description is needed.
منابع مشابه
α decay of the excited states in 12 C at 7 . 65 and 9 . 64 MeV
High-resolution triple-α coincidence data were used to reconstruct the decay of the excited states in 12C at 7.65 MeV (J π = 0+) and 9.64 MeV (J π = 3−). These data are consistent with the α-particle decay of both levels proceeding exclusively through Beg.s.. In the first of these cases, the Hoyle state, an upper limit of 0.45% (at the 99.75% confidence level) is set for a component producing t...
متن کاملMeasurement of the radiative branching ratio for the Hoyle state using cas- cade gamma decays
A new setup consisting of four 5” by 5” NaI scintillators and an array of particle detectors is being developed. Proton-gamma-gamma coincidences will be measured using the 12C(p, p ′ )12C reaction at 10.5 MeV energy. The new setup will be used for the measurement of the electromagnetic decay rate of the Hoyle state via two E2 transitions. We report the initial experimental results for singles g...
متن کاملResonant behaviour in the interaction of the 12C + 12C system at energies above the coulomb barrier
2014 Resonances in the 12C + 12C interaction at Ecm = 7.45, 8.45, 8.85 and 9.25 MeV corresponding to excitation energies in 24Mg of 21.4, 22.4, 22.8 and 23.2 MeV respectively are reported. These resonances are seen in the proton and alpha exit channels. No resonances in 12C + 12C were reported previously in this energy region, where earlier calculations predicted a group around Ecm = 7.6 MeV. L...
متن کاملپراکندگی کشسان یونهای N15 توسط C12 درMeV 23
Scattering of 15N ions with the energy of Elab = 23 MeV on the CH2(Au) target is investigated. Elastic scattering of these ions in the angular range of 7°-19° was measured by employing the silicon strip detector, “LEDA”. Using the measured scattering data, deviation of ion beam, number of incident ions on the target and differential cross sections of the 12C(15N, 15N)12C elastic scattering in ...
متن کاملContinuum spectroscopy with a 10 C beam : Cluster structure and three - body decay
Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of E/A = 10.7 MeV 10C on Be and C targets. After inelastic scattering, structures associated with excited states in 10C were observed at 5.22, 5.29, 6.55, 6.56, 6.57, and 8.4 MeV which decay into the 2p + 2α final state. This final state is created via a number of different decay paths, which ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 91 8 شماره
صفحات -
تاریخ انتشار 2003