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Chronological Thread 
  • From: Máté Zoltán <mate AT atomki.mta.hu>
  • To: Fizinfo AT lists.kfki.hu
  • Subject: [Fizinfo] Atomki-szeminárium
  • Date: Fri, 8 Nov 2013 15:39:10 +0100 (CET)
  • List-archive: <http://mailman.kfki.hu/pipermail/fizinfo>
  • List-id: ELFT HÍRADÓ <fizinfo.lists.kfki.hu>

Az MTA Atommagkutató Intézetének előadótermében
(Debrecen, Bem tér 18/c. 12. ép. III. em.)
2013. november 14-én, csütörtökön 11:00-kor


Tomohiro UESAKA
(RIKEN Nishina Center for Accelerator-Based Science)

Shed Light of Spin Polarization on Exotic Nuclei


címmel előadást tart.

Az előadás előtt 10:30-tól tea, vendégeket szívesen látunk.


Máté Zoltán


Abstract:
Recent experimental and theoretical studies have revealed that spin degrees
of freedom play a vital
role in exotic nuclei. Tensor force effects on the evolution of shell and
possible occurrence of p-n
pairing in the proton-rich region are good examples of manifestations of spin
degrees of freedom.
In exploring the spin effects in exotic nuclei, scattering with polarized
protons should be a
powerful tool. We have constructed a novel polarized proton solid target[1]
aiming to shed light of
polarization on the physics of exotic nuclei. A distinguished feature of the
target system is that it
works under a low magnetic field of 0.1 T and a high temperature of 100 K,
which exhibits a
striking contrast to standard DNP targets working in extreme conditions of
several Tesla and sub-
Kelvin.
The polarized proton target was applied, for the first time, to measurement
of vector analyzing
power in the proton elastic scattering of neutron-rich 6,8He nuclei at 71
MeV/nucleon at RIPS,
RIKEN[2, 3]. The data of vector analyzing power indicate that 1) spin-orbit
potentials in neutronrich
6,8He nuclei are considerably shallower that those of stable nuclei and 2)
the α clusters in 6,8He
are major origins of the spin-orbit potentials. In particular, it is
indicated that the α-cluster
distribution is a possible key for understanding spin-orbit coupling in those
nuclei. At RI Beam
Factory, the polarized target has been applied to hole-state spectroscopy via
the (p,2p) knockout
reaction from unstable oxygen isotopes.
In the seminar, I will begin with a general overview of spin physic of exotic
nuclei and of a
polarized proton target system developed at RIKEN. Subsequently, the results
from the proton
elastic scattering experiments and the (p,2p) knockout experiments will be
presented.
[1] T. Wakui et al. , Nucl. Instrum. Methods Phys. Res. A 550 (2005) 521.
A. Obertelli and T. Uesaka, Eur. Phys. J. 47 (2011) 105.
[2] T. Uesaka, S. Sakaguchi et al., Phys. Rev. C 82 (2010) 021602(R).
S. Sakaguchi et al., Phys. Rev. C 84 (2011) 024604.
[3] S. Sakaguchi et al., Phys. Rev. C 87 (2013) 021601(R).




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