FACTOID # 14: North Carolina has a larger Native American population than North Dakota, South Dakota and Montana combined.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Cluster decay
Nuclear processes
Radioactive decay processes

Nucleosynthesis Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles. ... Alpha decay is a form of radioactive decay in which an atomic nucleus ejects an alpha particle and transforms into a nucleus with mass number 4 less and atomic number 2 less. ... In nuclear physics, beta decay (sometimes called neutron decay) is a type of radioactive decay in which a beta particle (an electron or a positron) is emitted. ... In the process of beta decay unstable nuclei decay by converting a neutron in the nucleus to a proton and emitting an electron and anti-neutrino. ... Electron capture is a decay mode for chemical elements that will occur when there are too many protons in the nucleus of an atom, and there isnt enough energy to emit a positron. ... This article is about electromagnetic radiation. ... Internal conversion or isomeric transition is the act of returning from an excited state by an atom or molecule. ... Neutron emission is a type of radioactive decay in which an atom contains excess neutrons and a neutron is simply ejected from the nucleus. ... Positron emission is a type of beta decay, sometimes referred to as beta plus (β+). In beta plus decay, a proton is converted to a neutron via the weak nuclear force and a beta plus particle (a positron) and a neutrino are emitted. ... Proton emission (also known as proton radioactivity) is a type of radioactive decay in which a proton is ejected from the nucleus. ... Spontaneous fission (SF) is a form of radioactive decay characteristic of very heavy isotopes, and is theoretically possible for any atomic nucleus whose mass is greater than or equal to 100 amu (elements near ruthenium). ... Nucleosynthesis is the process of creating new atomic nuclei either by nuclear fusion or nuclear fission. ...

  • Neutron Capture
    • The R-process
    • The S-process
  • Proton capture:
    • The P-process

Cluster decay is the nuclear process in which a radioactive atom emits a cluster of neutrons and protons. While this term technically includes alpha decay, they are usually kept separate because the latter is much more common. Cluster decay only occurs a small percentage of the time in all cases. It also is limited to the heavy atoms which have the energy to expel a portion of its nucleus. The R process (R for rapid) is a neutron capture process for radioactive elements which occurs in high neutron density, high temperature conditions. ... The S process (S for slow) is a neutron capture process in the decay of radioactive elements that occurs in lower neutron density, lower temperature conditions. ... The p process was believed to be a proton capture process which occurrs during supernovae explosions. ... Radioactive decay is the set of various processes by which unstable atomic nuclei (nuclides) emit subatomic particles. ... Properties For alternative meanings see atom (disambiguation). ... Properties In physics, the neutron is a subatomic particle with no net electric charge and a mass of 939. ... Properties In physics, the proton (Greek proton = first) is a subatomic particle with an electric charge of one positive fundamental unit (1. ... Alpha decay is a form of radioactive decay in which an atomic nucleus ejects an alpha particle and transforms into a nucleus with mass number 4 less and atomic number 2 less. ... Plural: nuclei In chemistry and physics, the nucleus (atomic nucleus) is the collection of protons and neutrons in the center of an atom that carries the bulk of the atoms mass and positive charge. ...


The known cluster emissions are as follows:

Isotope Particle emission Decay percentage
114-Ba 12-C 3.0E-5 %
221-Fr 14-C 9E-13 %
221-Ra 14-C 1E-12 %
222-Ra 14-C 3.0E-8 %
223-Ra 14-C 8.9E-8 %
224-Ra 14-C 4.0E-9 %
226-Ra 14-C 3.2E-9 %
225-Ac 14-C 6E-10 %
228-Th 20-O 1E-11 %
232-Th Ne  ?
232-U Ne 9E-10 %
233-U Ne 7E-11 %
234-U Mg

Ne

1E-11 %

9E-12 %

235-U Ne

28-Mg

8.E-10 %

8.E-10 %

236-U 30-Mg  ?
242-Cm 34-Si 1.E-14 %

Data from the Brookhaven National Laboratory National Nuclear Data Center (http://www.nndc.bnl.gov/)


  Results from FactBites:
 
Cluster decay - Wikipedia, the free encyclopedia (185 words)
Cluster decay is the nuclear process in which a radioactive atom emits a cluster of neutrons and protons.
Cluster decay is notably different from spontaneous fission.
It is possible that other exotic isotopes decay in these methods as helium is studied in particle accelerators to a great degree.
Double beta decay - Wikipedia, the free encyclopedia (411 words)
In the process of beta decay unstable nuclei decay by converting a neutron in the nucleus to a proton and emitting an electron and anti-neutrino.
In order for beta decay to be possible the final nucleus must have a larger binding energy than the original nucleus.
In neutrinoless double beta decay the emitted neutrino is immediately absorbed (as its anti-particle) by another nucleon of the nucleus, so the total kinetic energy of the two electrons would be exactly the difference in binding energy between the initial and final state nuclei.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m