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1.1 Radioisotopes in nuclear medicine Nowadays, many different stable and radioactive isotopes, each with unique physical and chemical properties, play significant roles in technological applications of importance to our modern society and are substantial to scientific research. One of the most common applications is the use of the radioisotopes in medicine. Medical radioisotopes are used to label some special chemical compounds to form radiopharmaceuticals. Radiopharmaceuticals are used extensively in the field of nuclear medicine in three main branches. The largest and the most common type involve diagnostic procedures in which a radionuclide in a chemically suitable form is administered to the patient, and the distribution of the radioactivity in the body is determined by an external radiation detector (Qaim, 2008). The results are in the form of image of the involved organ, which provides information about the functioning of person’s specific organs via emission tomography. The second branch of nuclear medicine deals with radionuclide techniques that are used for the analysis of concentration of hormones, antibodies, drugs and other important substances in samples of blood or tissues. The third branch is radiation therapy, which is the ultimate aim of all diagnostic investigations. Here the tissues or organs are treated with radiation and restored to the normal functions in the human body (Loveland, et al., 2006).

Isobaric analog states of $^{7}\mathrm{He}$ have been investigated by a novel technique involving the observation of the resonant yield of neutrons from the $^{6}\mathrm{He}(p,n)$ reaction in coincidence with $\ensuremath{\gamma}$ rays from the decay of the $({0}^{+},T=1)$ state in $^{6}\mathrm{Li}$. The $\ensuremath{\gamma}$ rays provide a clean signature for the isospin-conserving neutron decay of the low-lying isobaric analog resonances. It is conclusively shown that the analog of the recently observed low-lying spin-orbit partner of the $^{7}\mathrm{He}$ ground state does not exist. Evidence is presented that this state lies at much higher energies, in agreement with microscopic calculations.