short-lived nuclear isomer

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• Nuclear isomer — A nuclear isomer is a metastable state of an atomic nucleus caused by the excitation of one or more of its nucleons (protons or neutrons). Metastable refers to the fact that these excited states have half lives more than 100 to 1000 times the… …   Wikipedia

• Delayed nuclear radiation — is a form of nuclear decay. When an isotope decays into a very short lived isotope and then decays again to a relatively long lived isotope, the products of the second decay are delayed. The short lived isotope is usually a meta stable nuclear… …   Wikipedia

• Isotopes of caesium — Caesium (Cs) has 40 known isotopes. The atomic masses of these isotopes range from 112 to 151. Only one isotope, 133Cs, is stable. The longest lived radioisotopes are 135Cs with a half life of 2.3 million years, 137Cs with a half life of 30.1671… …   Wikipedia

• Protactinium — thorium ← protactinium → uranium Pr ↑ Pa ↓ …   Wikipedia

• Fission products (by element) — On this page, a discussion of each of the main elements in the fission product mixture from the nuclear fission of an actinide such as uranium or plutonium is set out by element. Krypton 83 86 Krypton 85 is formed by the fission process witha… …   Wikipedia

• Americium-242 — Americium 242m is a radioactive isotope of Americium with 95 protons and electrons and 147 neutrons and a mass of 242.0595492 g/mol. It has a half life of approximately 141 years, decaying: #99.54% of the time by isomeric transition (with a decay …   Wikipedia

• Krypton-85 — Infobox isotope alternate names = symbol =Kr mass number =85 mass =84.9125273(21) num neutrons =49 num protons =36 abundance = halflife =10.756 years error halflife = background =#7F7 text color = decay product = decay symbol = decay mass = decay …   Wikipedia

• Excited state — Excitation is an elevation in energy level above an arbitrary baseline energy state. In physics there is a specific technical definition for energy level which is often associated with an atom being excited to an excited state.In quantum… …   Wikipedia

• Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …   Universalium

• radioactivity — /ray dee oh ak tiv i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. Also called activity. [1895… …   Universalium

• Technetium — molybdenum ← technetium → ruthenium Mn ↑ Tc ↓ Re …   Wikipedia