[Triumf-seminars] TRIUMF Nuclear Physics Seminar today at 15:30

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Tue Mar 17 10:37:05 PDT 2015


Date/Time: Mon 2015-03-16 at 15:30

Location:  Auditorium          

Speaker:   Lee Evitts (University of Surrey & TRIUMF)

Title:     Electric Monopole Transition Strengths in 62Ni

Abstract: Electric monopole (E0) transitions are possible between different states in a nucleus which have the same spin and parity. Due to angular momentum selection rules these E0 transitions cannot proceed by gamma-ray emission and alternatively involve the internal conversion or internal pair formation processes. The E0 transition strength is related to the mean square charge radii of the states involved and the degree of quantum mechanical mixing between them. The measurement of E0 transition strengths can provide sensitive tests of nuclear models.

Excited states in 62Ni were populated through inelastic proton scattering of a beam provided by the 14UD Pelletron accelerator at the Australian National University.  E0 transition strengths were measured from simultaneous detections of the internal conversion electrons and gamma rays emitted from the de-excitating states, using the Super-e spectrometer coupled with a Germanium detector. The strength of the 2nd 0+ to 1st 0+ transition has been measured to be 77(+23, -34) x10E-3 and agrees with previously reported values.  The measured E0 transition strength of the 2nd 2+ to 1st 2+ transition in 62Ni has been measured for the first time and represents the largest E0 transition strength measured to date in nuclei heavier than Ca.  These new experimental results are not consistent with the previous classification of the low-lying states in 62Ni as vibrational excitations. A discussion of the experimental method and results will be presented, along with preliminary shell model calculations.

Viewable at the URL below, please contact Greg Hackman (hackman at triumf dot ca) for access code:

http://mediasitemob1.mediagroup.ubc.ca/Mediasite/Catalog/catalogs/TriumfNuclearPhysics

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General TRIUMF seminar information available at http://www.triumf.ca/home/upcoming-events/about-seminars-lectures



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