Determination of astrophysical nuclear reaction rates using light neutron-rich RNBs
نویسندگان
چکیده
Excitation functions of 8 Li(, n), (d, t) and 12 B(, n) reactions were directly measured in the energy region of astrophysical interest using low-energy radioactive nuclear beams of 8 Li and 12 B. Each measured excitation function is strongly affected by one or more resonances through a compound nucleus. The measured excitation functions are presented. Dominant r-process paths through 8 Li at various temperatures are discussed and our future experimental plan is also presented.
منابع مشابه
Production of Exotic (or Polarized) Low-Energy Radioactive Beams via Two Successive Nuclear Reactions: Tertiary Beams
We propose a method to produce usable amounts (1 to 100/s) of low-energy, very neutron-, proton-rich or highly-polarized radioactive nuclear beams (RNBs) via a two-stage production method which utilizes a high-intensity secondary RNB with a second production target. As an example: 7Li+9Be→ 8Li→ 8Li+9Be→ 9Li. The latter (9Li) is very difficult to produce at low energies (a few MeV/u) as it is se...
متن کاملCalculations of Nuclear Reactions of Astrophysical Interest Involving Unstable Nuclei
Nuclear reactions involving unstable nuclei play an important role in nucleosyn-thesis. Such reactions are mainly associated with explosive astrophysical scenarios occurring at the nal stages of stellar evolution. For many nuclear reactions involving unstable nuclei the direct reaction mechanism cannot be neglected and may even be the dominant reaction mechanism. For example, the direct{reactio...
متن کاملSensitivity of P Process Nucleosynthesis to Nuclear Reaction Rates in a 25 Solar Mass Supernova Model
The astrophysical p process, which is responsible for the origin of the proton rich stable nuclei heavier than iron, was investigated using a full nuclear reaction network for a type II supernova explosion when the shock front passes through the O/Ne layer. Calculations were performed with a multi-layer model adopting the seed of a pre-explosion evolution of a 25 solar mass star. The reaction f...
متن کاملImproved predictions of nuclear reaction rates with the TALYS reaction code for astrophysical applications
Context. Nuclear reaction rates of astrophysical applications are traditionally determined on the basis of HauserFeshbach reaction codes. These codes adopt a number of approximations that have never been tested, such as a simplified width fluctuation correction, the neglect of delayed or multiple-particle emission during the electromagnetic decay cascade, or the absence of the pre-equilibrium c...
متن کاملASTROPHYSICAL NEUTRON CAPTURE RATES IN s– AND r–PROCESS NUCLEOSYNTHESIS
Astrophysical neutron capture rates of light and heavy nuclei have been measured and calculated. For the measurements the activation technique was applied at the 3.75 MV Karlsruhe Van de Graaff accelerator, and at the Geel electron linear accelerator (GELINA) the time–of–flight (TOF) method was used. The calculations were performed using direct and compound nuclear capture models.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008