نتایج جستجو برای: 7be concentrations
تعداد نتایج: 307122 فیلتر نتایج به سال:
The review describes a number of indirect methods in nuclear astrophysics using radioactive beams: Coulomb dissociation, transfer reactions (the ANC method), breakup of loosely bound nuclei at intermediate energies, the use other spectroscopic measurements, including -decay studies and the determination of resonance parameters. The examples chosen are drawn from the experiments the author was i...
We report the first detailed study of the relative importance of the stripping and diffraction mechanisms involved in nucleon knockout reactions, by the use of a coincidence measurement of the residue and fast proton following one-proton knockout reactions. The measurements used the S800 spectrograph in combination with the HiRA detector array at the NSCL. Results for the reactions 9Be(9C,8B+X)...
Optimisation of the confinement and sustainability of a thermonuclear plasma requires methods to monitor processes in the plasma. In this work three materials were used as activation targets (Ti, MgF2 and a TiVAl compound). They were placed inside the joint European Torus (JET) vacuum chamber. Certain gamma-ray emitting radionuclides (7Be, 54Mn, 56Co, 57Co, 58Co and 46Sc) were measured using ul...
It is shown that the striking energy variation in the p d → 3He η cross section near threshold is probably due to a final state interaction associated with a large (complex) η − 3He scattering length. The consequences of this hypothesis are studied for the production of the meson in the η − 4He and η − 7Be channels. PACS number(s): 25.40.Ve, 13.75.-n, 25.10.+s The cross sections for the product...
Precision atomic spectroscopy experiments for Be isotopes have been carried out at the prototype universal slow RI-beam (SLOWRI) setup at RIKEN. Radioactive Be ions produced at 1 GeV were decelerated and thermlized in an RF-carpet ion guide. The thermalized ions were transferred to an ion trap where laser cooling was used to reduce the ion energy to the order of 1 μeV. Laser microwave double re...
We study the stability of the two–neutrino MSW solution of the solar neutrino problem, corresponding to solar νe transitions into sterile neutrino, νe → νs, with respect to changes of the total fluxes of 8B and 7Be neutrinos, ΦB and ΦBe. For any value of ΦBe from the interval 0.7ΦBP Be ≤ ΦBe ≤ 1.3ΦBP Be (for ΦBe = 0.7ΦBP Be ) the νe → νs MSW transitions provide at 95% C.L. a description of the ...
We explore a novel possibility of determining the solar model parameters, which serve as input in the calculations of the solar neutrino fluxes, by exploiting the data from direct measurements of the fluxes. More specifically, we use the rather precise value of the 8B neutrino flux, φB obtained from the global analysis of the solar neutrino and KamLAND data, to derive constraints on each of the...
Astrophysical S factors and reaction rates of the direct radiative capture processes He3(α,γ)7Be H3(α,γ)7Li, as well primordial abundance Li7 element, are estimated in framework a modified two-body potential model. It is shown that suitable modification phase-equivalent α−3He potentials d waves can improve description astrophysical factor for at energies above 0.5 MeV. An Li/H7 ratio (4.89±0.18...
Phenomenological R -matrix has been a standard framework for the evaluation of resolved resonance cross section data in nuclear physics many years. It is powerful method comparing different types experimental and combining results measurements order to gain better estimation true underlying sections. Yet practical challenge always uncertainty on both sections at energies interest fit parameters...
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