[Isac-science-forum] ISAC Science Forum talks today, 15:30 auditorium

[John Behr]

There are two ISAC Science Forum talks (informal talks on research 
progress) today, starting at 15:30 in the  auditorium.
These are the last talks scheduled for this term. If you know of further 
appropriate talks, please let me know.

The info below is redundant with the TRIUMF seminar notices.

thanks,
John Behr

Date/Time: Mon 2017-11-27 at 15:30

Location:  Auditorium

Speaker:   Thanassis Psaltis (McMaster University)

Title:     Breakout reactions from the pp-chain and the nu-p process: 
Measurement of the 7Be(alpha,gamma)11C reaction rate in inverse kinematics

Abstract: The origin of about 35 neutron-deficient stable isotopes with 
mass numbers A >74, known as the p-nuclei, has been a long-standing puzzle 
in Nuclear Astrophysics. The neutrino-p process is a candidate for the 
production of  the light p-nuclei, but it presents high sensitivity to 
both supernova dynamics and nuclear physics [1,2]. It has been recently shown that the 
breakout from pp-chains through the 7Be(alpha,gamma)11C reaction, which 
occurs prior to nu-p process, can significantly influence the production 
of p-nuclei in the 90<A<110 region [2]. Nevertheless, this reaction has 
not been studied well yet in the relevant temperature range--- T_9 =1.5-3. 
To that end, the first study of important resonances of 
7Be(alpha,gamma)11C reaction with unknown strengths using 
DRAGON [3] was recently held at TRIUMF. The reaction was studied in 
inverse kinematics using a radioactive 7Be (t1/2 =53.24 d) beam provided 
by ISAC-I and two resonances above the alpha-threshold --- Eth = 7543.62 
keV --- were measured.

The experimental details, some preliminary results, and GEANT3 simulations 
of the transmission of the recoils and the efficiency of the BGO array of 
DRAGON will be discussed.

References
[1] C. Frohlich et al., Phys. Rev. Lett. 96, 142502 (2006).
[2] S. Wanajo, H.-T. Janka and S. Kubono, Astrophys. J. 729, 46 (2011).
[3] D.A. Hutcheon et al., Nucl. Instr. Meth. Phys. Res. A 498, 190 (2003).


Date/Time: Mon 2017-11-27 at 16:00

Location:  Auditorium

Speaker:   Pascal Reiter (TRIUMF)

Title:     Do you know what's in your beam? First on-line results from 
TITAN'S MR-TOF-MS

Abstract: TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) is a 
multiple ion trap system capable of performing high-precision mass 
measurements and in-trap decay spectroscopy. TITAN has specialised in fast 
Penning trap mass spectrometry of short-lived exotic nuclei using its 
Measurement Penning Trap (MPET). In spring this year an isobar separator 
based on the Multiple-Reflection Time-Of-Flight Mass
Spectrometry (MR-TOF-MS) technique has been installed on the TITAN 
platform; similar to devices used at other ion trap facilities.

In addition to isobar separation, the MR-TOF-MS enables mass measurements 
of very short-lived nuclides (half-life > 3 ms) that are produced in very 
low quantities (yields of > 0.5 pps) on its own. As a non-scanning 
broadband mass spectrometer the MR-TOF-MS can efficiently be used for beam 
diagnostics and determination of yields or beam compositions, including 
stable components.

In this ISAC Science forum we want to present recent results obtained with 
the newly installed MR-TOF-MS during experiments measuring neutron-rich 
Ti, Ga and Mn isotopes, as well as molecular beams from OLIS.