Blog of the Isotopes

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8 posts · 3,541 views

Nuclear Physics: A combination of research highlights and news, and comments on nuclear physics issues and sometimes related science and politics, with a UK bias.

Paul Stevenson
8 posts

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  • January 15, 2015
  • 07:08 AM
  • 235 views

Samarium from the stars

by Paul Stevenson in Blog of the Isotopes

Recent nuclear experiments involving smashing up uranium nuclei and examining the fragments help tell us how elements are formed in the stars... Read more »

Patel, Z., Söderström, P., Podolyák, Z., Regan, P., Walker, P., Watanabe, H., Ideguchi, E., Simpson, G., Liu, H., Nishimura, S.... (2014) Isomer Decay Spectroscopy of Sm164 and Gd166: Midshell Collectivity Around N. Physical Review Letters, 113(26). DOI: 10.1103/PhysRevLett.113.262502  

  • January 15, 2015
  • 06:59 AM
  • 222 views

Samarium from the stars

by Paul Stevenson in Blog of the Isotopes

Over the Christmas period, I enjoyed time with my family, sharing presents, eating more food than normal, and suchlike.  One of the perks of my job is that the University shuts down between Christmas and new year, and we are not expected to be in the office.  Not so the stakhanovites at the American Physical Society.  They beavered away producing a regular weekly edition of Physical Review Letters, and the edition for the week ending 31st Dec came out as usual, with online ar........ Read more »

Patel, Z., Söderström, P., Podolyák, Z., Regan, P., Walker, P., Watanabe, H., Ideguchi, E., Simpson, G., Liu, H., Nishimura, S.... (2014) Isomer Decay Spectroscopy of Sm164 and Gd166: Midshell Collectivity Around N. Physical Review Letters, 113(26). DOI: 10.1103/PhysRevLett.113.262502  

  • March 31, 2014
  • 04:48 PM
  • 297 views

And nature does it in real-time

by Paul Stevenson in Blog of the Isotopes

A paper of mine appeared today in Physical Review E.  Called, "Extension of the continuum time-dependent Hartree-Fock method to proton states1."  As the name suggests, it is a paper about methodology - so it's not going to feature in any press-releases about exciting new physics results.  It's even an extension to an existing method (from our previous paper), which might make it seem all the less exciting.  I think it's still a good paper, and a useful one, hence the blo........ Read more »

C. I. Pardi, P. D. Stevenson and K. Xu. (2014) Extension of the continuum time-dependent Hartree-Fock method to proton states. Physical Review E. info:/10.1103/PhysRevE.89.033312

  • February 10, 2014
  • 07:59 AM
  • 413 views

2013 Update of the discovery of nuclides

by Paul Stevenson in Blog of the Isotopes

I noticed on the arXiv server this morning that a preprint has appeared with the 2013 update of the project, run by Michael Thoennessen of MSU, documenting the experimental discover of nuclides. Nuclides are the nuclear equivalent of chemical elements - the basic units of matter.  Each element is characterised by the number of protons in the nucleus (or equivalently by the number of electrons orbiting a neutral atom of the element).  They run from element #1 - Hydrogen, with one p........ Read more »

M. Thoennessen. (2014) 2013 Update of the discoveries of nuclides. arXiv. arXiv: 1402.1663v1

  • June 12, 2013
  • 01:48 PM
  • 502 views

50 years of the Cabbibo mechanism

by Paul Stevenson in Blog of the Isotopes

Fifty years ago this week, the journal Physical Review Letters published an article by Nicola Cabibbo entitled "Unitary Symmetry and Leptonic Decays". It gave a working and quantitative theoretical description of how particles which interact by the strong interaction (one of the fundamental forces of nature) can decay according to the weak interaction (another of them). It was already known that there were some patterns and rules that seemed to be obeyed, but Cabibbo gave a beautiful........ Read more »

Cabibbo, N. (1963) Unitary Symmetry and Leptonic Decays. Physical Review Letters, 10(12), 531-533. DOI: 10.1103/PhysRevLett.10.531  

  • March 6, 2013
  • 02:29 AM
  • 498 views

What can we infer about nuclear matter from giant quadrupole resonances?

by Paul Stevenson in Blog of the Isotopes

To understand what makes protons and neutrons stick together, nuclear physicists correlate the excitation energy of particular vibrational modes of lead nuclei with properties of the matter found inside neutron stars. The surprisingly close correlation reveals information about the nuclear force... Read more »

  • January 20, 2013
  • 08:00 PM
  • 416 views

The size of lead

by Paul Stevenson in Blog of the Isotopes

Lead nuclei start growing in size at an increased rate as neutrons are added beyond the N=126 'magic number'. A new paper has an idea why.... Read more »

Goddard, P., Stevenson, P., & Rios, A. (2013) Charge Radius Isotope Shift Across the N. Physical Review Letters, 110(3). DOI: 10.1103/PhysRevLett.110.032503  

  • August 2, 2012
  • 09:57 AM
  • 958 views

Ring-shaped nuclei

by Paul Stevenson in Blog of the Isotopes

Atomic nuclei have been predicted to exist in a ring configuration when they rotate very rapidly. Such nuclei would be the source of immense magnetic fields.... Read more »

T. Ichikawa, J. A. Maruhn, N. Itagaki, K. Matsuyanagi, P. -G. Reinhard, & S. Ohkubo. (2012) Existence of exotic torus configuration in high-spin excited states of $^{40}$Ca. ArXiv. arXiv: 1207.6250v1

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