• neutron
  • It is theorized that 298Fl will have a relatively long half-life, as N = 184 is expected to correspond to a closed neutron shell. (wikipedia.org)
  • Iodine pit behavior is not observed in reactors with neutron flux density below 5×1016 neutrons/(m2·s), as the 135Xe is primarily removed by decay instead of neutron capture. (wikipedia.org)
  • heavier
  • From the late 1940s to the early 1960s, the early days of the synthesis of heavier and heavier transuranium elements, it was predicted that since such heavy elements did not occur naturally, they would have shorter and shorter half-lives to spontaneous fission, until they stopped existing altogether at around element 108 (now known as hassium). (wikipedia.org)
  • Heavier elements would likely be too short-lived to be detected with current technology: they would decay within a microsecond, before reaching the detectors. (wikipedia.org)
  • nuclear
  • In the field of nuclear physics, half-life refers to the amount of time required for radioactive substances to decay into half. (studypug.com)
  • This educational event merges art, ecology, environmentalism and environmental justice, to inform the public about uranium mining and milling, nuclear power issues, nuclear weapons and the nuclear fuel cycle from "cradle to grave" life-cycle assessment - and the effects of radioactivity on humans and other species. (wikipedia.org)
  • It was found that O-degree cross sections of the (d, 2He) reactions are proportional to the Gamow-Teller beta decay strength, and such reactions can be a powerful tool in studies of nuclear spin-isospin mode. (nii.ac.jp)
  • thus it was theorized that elements with full nuclear shells - having so-called "magic" numbers of protons or neutrons - would be stabilized against radioactive decay. (wikipedia.org)
  • The NUBASE evaluation of nuclear and decay properties" (PDF). (wikipedia.org)
  • At the time of Half-Life, he works at Black Mesa Research Facility, a facility in New Mexico, conducting nuclear and subatomic research. (wikipedia.org)
  • reaction
  • They were able to confirm both the decay data and cross sections for the fusion reaction. (wikipedia.org)
  • The reaction was repeated in September 2003 in order to attempt to confirm the decay data for 287Fl and 283Cn since conflicting data for 283Cn had been collected (see copernicium). (wikipedia.org)
  • Within Half-Life 2: Episode One, the destruction of the Citadel's reactor has started a chain reaction that will take all of City 17 with it. (wikipedia.org)
  • In order to prove that the decays were from dubnium-268, the team repeated the reaction in August 2005 and separated the +4 and +5 fractions and further separated the +5 fractions into tantalum-like and niobium-like ones. (wikipedia.org)
  • Gordon Freeman
  • In Half-Life, the player takes on the role of Gordon Freeman, a scientist involved in an accident that opens an inter-dimensional portal to the borderworld of Xen, allowing the alien creatures of Xen to attack the facility. (wikipedia.org)
  • Gordon Freeman, a theoretical physicist, is involved in an experiment that accidentally creates a dimensional rift to a trans-dimensional world called Xen, causing extraterrestrial life to swarm the facility and kill the staff. (wikipedia.org)
  • This section deals with characters that appear in Half-Life, Opposing Force, Blue Shift and Half-Life: Decay Gordon Freeman, Ph.D., is the silent protagonist of the Half-Life series, and the playable character in Half-Life, and all games in the Half-Life 2 series. (wikipedia.org)
  • The G-Man's constant appearances in the Half-Life games, as well as his revealing monologues with series protagonist Gordon Freeman, imply he is of great importance and somewhat anchors the endeavors of the player. (wikipedia.org)
  • In Half-Life: Blue Shift, the playable Barney progresses through Black Mesa to escape the events of the resonance cascade, and is able to do so, in contrast to Gordon Freeman and Adrian Shephard, who are held in stasis. (wikipedia.org)
  • stable
  • Some radionuclides have half-lives so long (many times the age of the universe) that decay has only recently been detected, and for most practical purposes they can be considered stable, most notably bismuth-209: detection of this decay meant that bismuth was no longer considered stable. (wikipedia.org)
  • neutrons
  • As there are not enough neutrons to offset their absorption by 135Xe, nor to burn the built-up xenon, the reactor has to be kept in shutdown state for 1-2 days until enough of the 135Xe decays. (wikipedia.org)
  • Opposing Force
  • However, Decay differs from Half-Life and its first two expansion packs, Opposing Force and Blue Shift, in that it is designed for cooperative multiplayer gameplay. (wikipedia.org)
  • Although developed after Opposing Force, no non-player characters or weapons from the earlier expansion appear in Decay. (wikipedia.org)
  • Half-Life: Opposing Force follows military soldier Adrian Shephard as he helps to quell another alien invasion within the Black Mesa facility. (wikipedia.org)
  • Shephard, a 22-year-old U.S. Marine Corporal, is the player's character in Half-Life: Opposing Force. (wikipedia.org)
  • time
  • If N0 is the initial quantity, after a time t years, the amount of quantity of radioactive material left N = N0*exp(-lambda*t), where lambda = 0.693/half life. (brainmass.com)
  • Primordial radionuclides, such as uranium and thorium, exist in the present time because their half-lives are so long (>100 million years) that they have not yet completely decayed. (wikipedia.org)
  • It displays the distribution of the number of events (radioactive decays) in a fixed time interval. (compadre.org)
  • alpha
  • Count the number of alpha decays . (brainmass.com)
  • Barney's name stemmed from the earlier alpha versions of Half-Life in which the model for the security guards held a resemblance to actor Don Knotts, inspiring comparisons with Knotts's character Barney Fife from The Andy Griffith Show, which in the United States has long been a disparaging term for an inept policeman or security guard. (wikipedia.org)
  • 292Lv
  • In April 2004, the team ran the experiment again at higher energy and were able to detect a new decay chain, assigned to 292Lv. (wikipedia.org)
  • scientists
  • It is the third expansion pack for Half-Life, and like its predecessors, Decay returns to the setting and timeline of the original story, albeit portraying the story from the viewpoint of a different set of protagonists: two women scientists working in the Black Mesa Research Facility. (wikipedia.org)
  • In Half-Life, players usually fight alone and only occasionally encounter friendly non-player characters who assist them, such as security guards and scientists. (wikipedia.org)
  • Within Half-Life: Blue Shift, Black Mesa security worker Barney Calhoun works to escape from the facility with Dr. Rosenberg and two other scientists. (wikipedia.org)
  • fraction
  • After chemical separation of a +4/+5 fraction, 15 SF decays were measured with a lifetime consistent with 268Db. (wikipedia.org)
  • model
  • The Radioactive Decay Distribution model was created using the Easy Java Simulations (Ejs) modeling tool. (compadre.org)
  • The source code zip archive contains an XML representation of the Radioactive Decay Distribution Model. (compadre.org)
  • W. Christian, Computer Program RADIOACTIVE DECAY DISTRIBUTION MODEL, Version 1.0 (2009), WWW Document, ( https://www.compadre.org/Repository/document/ServeFile.cfm?ID=8489&DocID=949 ). (compadre.org)
  • Radioactive Decay Distribution Model (Version 1.0) [Computer software]. (compadre.org)
  • The possibility of detection of elements 121 through 124 depends greatly on the theoretical model being used, as their half-lives are predicted to be very close to the one-microsecond border. (wikipedia.org)
  • probability
  • Another common objection states that the decay particle was always travelling in a straight line, and that only the probability of the distribution is spherical. (wikipedia.org)
  • measurement
  • By consideration of the normal process of quantum measurement, it is clear that if one detector registers the decay, then the other will not: a single particle cannot be detected by both detectors. (wikipedia.org)
  • single
  • Although intended to be played by two people in split screen mode, Decay can still be played by a single player. (wikipedia.org)
  • The game is unique in the context of the Half-Life series in that it is the only game divided into separate missions, each with a specific objective to pursue, instead of consisting of a single unbroken narrative. (wikipedia.org)
  • However
  • However, during the events subsequent to the "Resonance Cascade", Adrian finds himself separated from his unit and fighting for his life. (wikipedia.org)
  • long
  • How long does it take for 80% of a sample of strontium-90 to decay? (jiskha.com)
  • some atomic electromagnetic excitations have a half-life about this long). (wikipedia.org)
  • These studies suppose that cancers happen from residual tissue radiation damage caused by the I-131, and should appear mostly years after exposure, long after the I-131 has decayed. (wikipedia.org)
  • Black Mesa Res
  • Half-Life takes place at a laboratory called the Black Mesa Research Facility, situated in a remote desert in New Mexico. (wikipedia.org)
  • Half-Life, the first game in the series, takes place at the fictional Black Mesa Research Facility in New Mexico circa the turn of the 21st century. (wikipedia.org)
  • product
  • If, after (for example) 0.3 microseconds, one has not seen the decay product on the inner, closer, hemisphere, one can conclude that the particle has decayed with almost absolute certainty, but is still in-flight to the outer hemisphere. (wikipedia.org)