Speaker
Dr
Grigory Rogachev
(Texas A&M University)
Description
Evolution of nuclear structure of Nitrogen isotopes (Z=7) and N=7 isotones with increasing imbalance between protons and neutrons has been a focus of intense scrutiny since the discovery of parity inversion in 11-Be. Yet, the level structure of the most exotic nuclear systems with 7 neutrons or protons (such as 9-He, 10-Li, 10-N) remain uncertain and presents a major challenge both theoretically and experimentally. Recent experimental results that shed light on the structure of 9-He and 10-N will be discussed.
The low-lying levels in 10-N (mirror of 10-Li) have been populated in 9-C+p resonance scattering [1]. The location of the 2s1/2 shell in this most neutron deficient isotope of Nitrogen is now firmly established. Properties of the ground and first excited states of 10-N will be discussed.
The level structure of 9-He was studied through the T=5/2 isobaric analog states in 9-Li, populated via 8-He+p resonance scattering [2]. No narrow T=5/2 structures were observed in the proton spectrum, providing strong evidence that there are no narrow, near neutron threshold states in 9-He, suggested previously in several other experiments (see [3] and references therein).
The new experimental results provide a good basis for better understanding of shell evolution in Z/N=7 nuclear systems and for making reliable extrapolations on the structure of 10-Li and 9-N (never observed) isotopes.
References:
[1] J. Hooker, G.V. Rogachev, V.Z. Goldberg, et al., Phys. Lett. B (submitted).
[2] E. Uberseder, G.V. Rogachev, V.Z. Goldberg, et al., Phys. Lett. B 754 323 (2016).
[3] T. Al Kalanee, et al., Phys.Rev. C 88, 034301 (2013).
Primary author
Dr
Grigory Rogachev
(Texas A&M University)
Co-authors
Dr
Antti Saastamoinen
(Texas A&M University, College Station, TX, USA)
Dr
Barry Davids
(TRIUMF, Vancouver, BC, Canada)
Dr
Brian Roeder
(Texas A&M University, College Station, TX, USA)
Dr
Changbo FU
(Shanghai Jiao Tong University, Shanghai, China)
Mr
Cordero Magana
(Texas A&M University, College Station, TX, USA)
Mr
Curtis Hunt
(Texas A&M University, College Station, TX, USA)
Dr
Dan Melconian
(Texas A&M University, College Station, TX, USA)
Dr
Ethan Uberseder
(University of Michigan, Ann Arbor, MI, USA)
Dr
Evgeniy Koshchiy
(Texas A&M University, College Station, TX, USA)
Dr
Grigory Chubarian
(Texas A&M University, College Station, TX, USA)
Ms
Heshani Jayatissa
(Texas A&M University, College Station, TX, USA)
Mr
Joshua Hooker
(Texas A&M University, College Station, TX, USA)
Dr
MArtin Alcorta
(TRIUMF, Vancouver, BC, Canada)
Dr
Robert Tribble
(Texas A&M University, College Station, TX, USA)
Dr
Vladilen Goldberg
(Texas A&M University, College Station, TX, USA)