Speaker
A. A. Ciemny
(Faculty of Physics, University of Warsaw, Poland)
Description
A characteristic feature of nuclei lying on the left of the $\beta$-stability path, extremely far away from it, is their high Q$_{\beta^+}$-value. This can result in the population of highly excited - and often unbound - states in the daughter nuclei. As a consequence, it can lead to $\beta$-delayed (multi-) charged-particle emission, being very competitive to deexcitation via $\gamma$ emission. Hence, studying of such decay channels is a unique tool for gaining an insight and understanding on the nuclear structure in this region. Moreover, such nuclei are often close to the path followed by the astrophysical rp-process [1,2].
The two most neutron-deficient silicon isotopes known, $^{22,23}$Si, were investigated in an experiment performed at the MARS spectrometer at the Cyclotron Institute, Texas A&M University. The ions were implanted into the Warsaw Optical Time Projection Chamber [3], which is an excellent tool for investigating rare decay modes with almost 100% detecting efficiency. The data collected allowed to confirm all known decay channels ($\beta$1p, $\beta$2p), as well as to identify convincing candidates for the new decay branches. The results of the analysis will be presented and discussed.
[1] H. Schatz et al., Phys. Rep. 294, 167 (1998)
[2] B.A. Brown et al., Phys. Rev. C 65, 045802 (2002)
[3] M. Pomorski et al. Phys. Rev. C, 90, 014311 (2014)
Primary author
A. A. Ciemny
(Faculty of Physics, University of Warsaw, Poland)
Co-authors
A. Fijałkowska
(Faculty of Physics, University of Warsaw, Poland)
A. Saastamoinen
(Texas A&M University, College Station, TX, USA)
B.T. Roeder
(Texas A&M University, College Station, TX, USA)
C. Hunt
(Texas A&M University, College Station, TX, USA)
C. Mazzocchi
(Faculty of Physics, University of Warsaw, Poland)
G. Kamiński
(Joint Institute for Nuclear Research, Dubna, Russia)
G. Rogachev
(Texas A&M University, College Station, TX, USA)
H. Jayatissa
(Texas A&M University, College Station, TX, USA)
J. Hooker
(Texas A&M University, College Station, TX, USA)
M. Pfützner
(Faculty of Physics, University of Warsaw, Poland)
M. Pomorski
(Faculty of Physics, University of Warsaw, Poland)
N. Sokołowska
(Faculty of Physics, University of Warsaw, Poland)
S. Sharma
(Faculty of Physics, University of Warsaw, Poland)
W. Dominik
(Faculty of Physics, University of Warsaw, Poland)
Y. Koshchiy
(Texas A&M University, College Station, TX, USA)
Z. Janas
(Faculty of Physics, University of Warsaw, Poland)
Ł. Janiak
(Faculty of Physics, University of Warsaw, Poland)
