Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Thu., July 21, 2016, at 3:00 PM - 4:00 PM (refreshments served at 2:40 PM)

Nuclear Physics and Astrophysics Using Beta Decay of Proton-Rich Nuclides

D. Pérez-Loureiro, Nat'l Superconducting Cyclotron Lab, Michigan State Univ., East Lansing, MI 48824
Bldg. 6000 Conference Room #233

The beta-decay of proton-rich nuclei is a powerful tool in nuclear science; it can be used to probe isospin asymmetries, and nuclear astrophysics. Large Qbeta -values of these nuclei allow the population of bound excited states of the daughter and open charged particle emission channels. Some of these levels correspond to astrophysically significant resonances which cannot be measured directly due to the lack of intense radioactive beams. In order to determine the strengths of these resonances, the partial widths for the de-excitation of these levels via gamma and charged particle emission have to be known, as well as the energies, spins, and parities. During the last years, our group at the NSCL measured the beta delayed gamma emission of several nuclear species (26P [1], 31Cl[2], and 20Mg[3]) to reduce the uncertainties in the rates of key nuclear reactions affecting astronomical observables associated with novae and Type I X-ray bursts. During this talk I will review these results discuss their relevance to nuclear astrophysics. To measure the charged particle branches we are developing a new gaseous detector based on Micromegas. During the last part of my talk, I will present the project and discuss its present status.

[1] M. B. Bennett et al., Phys. Rev. Lett.111, 232503 (2013) [2] M. B. Bennett et al., Phys. Rev. Lett. 116, 102502 (2016) [3] B. E. Glassman et al., Phys. Rev. C 92, 042501(R) (2015)

Contact: Alfredo Galindo-Uribarri, (865) 574-6124