New type of asymmetric fission in proton-rich nuclei.

بررسی توزیع زاویه‌ای پاره‌های شکافت هسته ‌های طلا و بیسموت با پروتونهای 25MeVتا30MeV

  The fission fragment angular distributions have been measured for proton-induced fission of 209Bi and 197Au nuclei using surface barrier detectors at several energies between 25 MeV and 30 MeV. The experimental anisotropies are found to be in agreement with the predictions of the Standard Saddle-Point Statistical Model (SSPSM). The fission cross sections of 209Bi 197Au nuclei were also measur...

Fission barriers in the neutron-proton isospin plane for heavy neutron-rich nuclei

Fragmentation of very neutron - rich projectiles around 132 Sn

We propose an experiment to isotopically identify and determine the production cross sections of residual nuclei in the fragmentation of very neutron-rich nuclei around Sn produced in the fission of relativistic U primary projectiles. These measurements will provide valuable information about a possible two-step reaction scheme (fission-fragmentation) to optimise the production of extremely neu...

توزیع بار الکتریکی محصولات شکافت حاصل از واکنش شکافت اورانیم 238 با پروتونهای 45-69 MeV

 Fission of 238U nuclei was performed by 45-69 MeV protons at the Cyclotron and Radioisotope Center of Tohoku University in Japan. The fission products originated in the reaction were identified by using gamma spectroscopy. The experimental data show that the charge distribution of isobar fission products follows a Gaussian distribution with a standard deviation independent of the selected mass...

New island of cluster emitters.

A new region of proton-rich parent nuclei decaying by spontaneous cluster emission with a measurable branching ratio relative to alpha decay is predicted within the analytical superasymmetric fission model. After a brief presentation of the model and of the seven mass tables used to calculate the released energy, the obtained results are discussed. Measurable half-lives and branching ratios are...