Tagged: CERN ISOLTRAP Toggle Comment Threads | Keyboard Shortcuts

  • richardmitnick 12:57 pm on June 19, 2013 Permalink | Reply
    Tags: , , , , CERN ISOLTRAP, , ,   

    From CERN: “CERN’s ISOLTRAP reveals new magic in the atomic nucleus” 

    CERN New Masthead

    19 June 2013
    Cian O’Luanaigh

    “The ISOLTRAP collaboration has measured the mass of exotic calcium nuclei using a new instrument installed at the ISOLDE facility at CERN. The measurements, published on 20 June in the journal Nature, clearly establish a new ‘magic number’ related to the stability of this exotic species. The results cast light on how nuclei can be described in terms of the fundamental strong force.

    isolde
    Part of the ISOLTRAP experimental apparatus at CERN (Image: CERN)

    ‘This measurement from a classic ISOLDE low-energy experiment complements well recent key results on radon, observed by post-accelerated beams, and on astatine, observed at the source with lasers,’ said CERN’s Director-General, Rolf Heuer. ‘It demonstrates beautifully that ISOLDE has a wealth of tools for producing exciting physics.’

    The results strengthen the prominence in calcium isotopes of a magic number that was not foreseen in the original ‘nuclear shell model’, for which Maria Goeppert-Mayer and Hans Jensen received the Nobel Prize in 1963, exactly 50 years ago. In this model, the protons and neutrons in a nucleus arrange themselves in ‘shells’ similar to those of electrons in atoms. The magic numbers correspond to full nuclear shells, in which the constituents are more tightly bound, leading to more stability and lighter masses.

    The ISOLTRAP team used the ISOLDE facility to make exotic isotopes of calcium, which has the magic number of 20 protons in a closed shell. Their goal was to find out how the shell structure evolves with increasing numbers of neutrons. Standard calcium with 20 neutrons is doubly magic, and a rare long-lived isotope has 28 neutrons – another magic number.

    Now, the ISOLTRAP team has determined the masses of calcium isotopes all the way to calcium-54, which has 34 neutrons in addition to the 20 protons. The measurements not only reveal a new magic number, 32, but also pin down nuclear interactions in exotic neutron-rich nuclei.”

    The full article is here.

    Meet CERN in a variety of places:

    Cern Courier

    THE FOUR MAJOR PROJECT COLLABORATIONS

    ATLAS
    CERN ATLAS New

    ALICE
    CERN ALICE New

    CMS
    CERN CMS New

    LHCb
    CERN LHCb New

    LHC

    CERN LHC New

    LHC particles

    Quantum Diaries


    ScienceSprings is powered by MAINGEAR computers

     
  • richardmitnick 1:02 pm on January 21, 2013 Permalink | Reply
    Tags: , , CERN ISOLTRAP   

    From CERN Bulletin: “Longer – Faster – Purer” 

    21 January 2013
    Caroline Duc

    “The MR-ToF-MS, a new ion trap, has been integrated into ISOLTRAP, the experiment that performs accurate mass measurements on short-lived nuclides produced at ISOLDE. When used as a mass separator and spectrometer, it extends ISOLTRAP’s experimental reach towards the limits of nuclear stability.

    woman
    Susanne Kreim, the ISOLTRAP local group leader at CERN in front of a part of the ISOLTRAP device.

    When mass measurement experiments like ISOLTRAP are placed in an on-line radioactive ion-beam facility they face a major challenge: the efficient and fast transfer of the nuclide of interest to the location where the mass measurement is performed.

    The biggest yield of one selected nuclide, without contaminants, needs to be transferred to the set-up as quickly as possible in order to measure its mass with the greatest precision. Recently, the ISOLTRAP collaboration installed a new device that provides a faster separation of isobars. It has significantly improved ISOLTRAP’s purification speed and given access to more exotic species.”

    device
    An ion detector was integrated on the left of the multi-reflection time-of-flight mass separator (MR-ToF MS) to allow it to be used as a spectrometer.

    See the full article here.

    Meet CERN in a variety of places:

    Cern Courier

    ATLAS

    i2

    ALICE

    CMS

    i3

    LHCb
    i4

    LHC

    LHC-particles
    Quantum Diaries


    ScienceSprings is powered by MAINGEAR computers

     
c
Compose new post
j
Next post/Next comment
k
Previous post/Previous comment
r
Reply
e
Edit
o
Show/Hide comments
t
Go to top
l
Go to login
h
Show/Hide help
shift + esc
Cancel
Follow

Get every new post delivered to your Inbox.

Join 345 other followers

%d bloggers like this: