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WTF? What is the point of including the link http://www.sciencemag.org/cgi/content/full/286/5437/28?ck=nck -- which requires a login -- in the References section? 203.109.213.221 ( talk) 10:49, 10 February 2008 (UTC)
14Be: four-neutron halo ??? 14Be is a two-neutron halo (12Be + n + n) 142.90.108.17 ( talk) 20:00, 25 June 2008 (UTC)
The above comment raises the question of whether there is a simple way to predict how many nucleons are in the halo? I would expect some simple recipe based on the shell model, analogous to the prediction of electron configurations for atoms in chemistry. Could someone who knows nuclear physics include the recipe used here with an example or two?
I also looked at the abstract of the reference given for 14Be, and note the words "Our calculation indicates that the 12Be(g.s.)+n+n configuration represents 66% only of the total wave function, and that core excitations cannot be neglected." So configuration interaction is important at least in this case, and it would be helpful to provide an assessment of the accuracy of one-configuration descriptions such as a two-neutron halo or a four-neutron halo. Dirac66 ( talk) 17:00, 22 June 2009 (UTC)
The article states: "Several nuclides have a halo in the excited state but not in the ground state."
Doesn't this mean that a purely chemical condition has the potential to effect a purely nuclear condition, perhaps such as half-life? I'd like to see more about this. Zaphraud ( talk) 02:11, 16 March 2009 (UTC)
The article gives a formula for the typical radius of a nucleus and states that nuclei that have a halo are "appreciably larger". It would be very useful to include in the isotope table their measured and predicted size (if such data is available), so that a comparison can be made. -- Doctor C ( talk) 17:04, 3 March 2012 (UTC)
When discussing Li-11, the article mentions that the cross-section is 3.16fm. Cross-section is usually measured in barns, and is a measurement of area. Does the author instead mean the radius of the nucleus? If so, what kind of radius is it, and from where was the value sourced? Seantellis ( talk) 15:12, 3 February 2014 (UTC)
We could drop columns 3 and 2 and even 1 as they add little/no info - and then just have a row per nuclide. Then could add a column with decay modes and products (eg Be-8 decays to 2 He-4). - Rod57 ( talk) 23:02, 20 September 2016 (UTC)
Does the Nuclear shell model predict halo properties ? - Rod57 ( talk) 23:19, 20 September 2016 (UTC)
How are halo nucleons distinct from valence nucleons (eg of spheroidal nuclei) ? - Rod57 ( talk) 00:58, 21 September 2016 (UTC)
How are they made and studied ? What equipment and procedures needed ? - Rod57 ( talk) 17:22, 21 September 2016 (UTC)
Here is an article from Science News discuss about A new particle accelerator aims to unlock secrets of bizarre atomic nuclei. ~~~~ Rjluna2 ( talk) 17:53, 28 July 2023 (UTC)
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WTF? What is the point of including the link http://www.sciencemag.org/cgi/content/full/286/5437/28?ck=nck -- which requires a login -- in the References section? 203.109.213.221 ( talk) 10:49, 10 February 2008 (UTC)
14Be: four-neutron halo ??? 14Be is a two-neutron halo (12Be + n + n) 142.90.108.17 ( talk) 20:00, 25 June 2008 (UTC)
The above comment raises the question of whether there is a simple way to predict how many nucleons are in the halo? I would expect some simple recipe based on the shell model, analogous to the prediction of electron configurations for atoms in chemistry. Could someone who knows nuclear physics include the recipe used here with an example or two?
I also looked at the abstract of the reference given for 14Be, and note the words "Our calculation indicates that the 12Be(g.s.)+n+n configuration represents 66% only of the total wave function, and that core excitations cannot be neglected." So configuration interaction is important at least in this case, and it would be helpful to provide an assessment of the accuracy of one-configuration descriptions such as a two-neutron halo or a four-neutron halo. Dirac66 ( talk) 17:00, 22 June 2009 (UTC)
The article states: "Several nuclides have a halo in the excited state but not in the ground state."
Doesn't this mean that a purely chemical condition has the potential to effect a purely nuclear condition, perhaps such as half-life? I'd like to see more about this. Zaphraud ( talk) 02:11, 16 March 2009 (UTC)
The article gives a formula for the typical radius of a nucleus and states that nuclei that have a halo are "appreciably larger". It would be very useful to include in the isotope table their measured and predicted size (if such data is available), so that a comparison can be made. -- Doctor C ( talk) 17:04, 3 March 2012 (UTC)
When discussing Li-11, the article mentions that the cross-section is 3.16fm. Cross-section is usually measured in barns, and is a measurement of area. Does the author instead mean the radius of the nucleus? If so, what kind of radius is it, and from where was the value sourced? Seantellis ( talk) 15:12, 3 February 2014 (UTC)
We could drop columns 3 and 2 and even 1 as they add little/no info - and then just have a row per nuclide. Then could add a column with decay modes and products (eg Be-8 decays to 2 He-4). - Rod57 ( talk) 23:02, 20 September 2016 (UTC)
Does the Nuclear shell model predict halo properties ? - Rod57 ( talk) 23:19, 20 September 2016 (UTC)
How are halo nucleons distinct from valence nucleons (eg of spheroidal nuclei) ? - Rod57 ( talk) 00:58, 21 September 2016 (UTC)
How are they made and studied ? What equipment and procedures needed ? - Rod57 ( talk) 17:22, 21 September 2016 (UTC)
Here is an article from Science News discuss about A new particle accelerator aims to unlock secrets of bizarre atomic nuclei. ~~~~ Rjluna2 ( talk) 17:53, 28 July 2023 (UTC)