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

[TRIUMF Seminars]

Date/Time: Mon 2015-03-09 at 15:30

Location:  Auditorium          

Speaker:   Jack Henderson (TRIUMF)

Title:     Spectroscopy on the proton drip-line; decay tagging of neutron-deficient 73,74Sr

Abstract: The isospin dependence of the nuclear interaction was probed using energy differences between analogue excited states across the A=74 isobaric triplet. The first spectroscopy of transitions between states in the proton-dripline nuclide, 74Sr was performed using the highly-selective recoil-beta tagging technique with the  JUROGAM II + RITU + GREAT setup at the University of Jyvaskyla. Considerable experimental development was required to achieve the requisite level of sensitivity and will be introduced.

The 2+ to 0+ and 4+ to 2+ transitions were identified through a combination of time and energy gates, and the implementation of a charged-particle veto. A beta-decay half-life was also extracted, and will be compared with a complementary measurement performed at RIKEN. Comparison with calculations will be presented, with implications for isospin-nonconserving interactions and the proton separation energy of 74Sr.

Additionally, candidates for the beta-delayed proton decay of 73Sr via 73Rb into 72Kr were observed using the same experimental setup and will be presented. The lowest energy proton detected will be compared with that which might be expected for the decay of the ground state in 73Rb, allowingfor the first  measurement of the proton separation energy. This value is of considerable astrophysical interest since 73Rb is considered to be a waiting point in the rp process.

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