Speaker
Dr
Hooi Jin ONG
(RCNP, Osaka University)
Description
The tensor interaction which originates from the pion exchange is
an essential interaction that provides the important two-body
attraction in the nuclear forces. The importance of the tensor
force has been demonstrated to reproduce the properties of
nuclear matter as well as to explain the binding energies of
the deuteron and alpha particles. In heavier nuclei, results from
recent experiments with radioactive-isotope beams have hinted at
a possible important role of the tensor forces in the changes of
the magic numbers and the orders of single-particle orbitals in
neutron-rich nuclei. However, the experiment evidences other than
those from the deuteron are indirect. Hence, to search
for direct evidence of the tensor interaction in heavier nuclei,
we carried out (p,d) reaction measurements on 12C and 16O.
The tensor interaction is expected to give rise to high momentum
components in nuclei. In this talk, we will report on an observation
of enhancements of high momentum neutrons, which may indicate
a direct evidence of tensor interaction.
The experiment was performed at the RCNP WS course using the
Grand Raiden spectrometer. Proton beams at three energies:
198, 295 and 392 MeV, with intensities around 5 -- 10 nA, were directed
onto a natural carbon or an ice target placed in a scattering chamber
before the GR spectrometer. The scattered deuterons were momentum
analyzed and transported to the focal plane of the GR, where they were
detected by two drift chambers and two 10-cm-thick plastic scintillators.
For each proton beam energy, measurements were performed at several
scattering angles between 5 -- 30 degrees to obtain data for different
momentum transfers at around 2 fm$^{-1}$ where marked effect of the
tensor interaction is expected.
Primary authors
Dr
Hooi Jin ONG
(RCNP, Osaka University)
Prof.
Isao TANIHATA
(RCNP/Beihang Univ.)
Co-authors
Prof.
Akira OZAWA
(Tsukuba Univ.)
Prof.
Atsushi TAMII
(RCNP)
Mr
Daiki ISHIKAWA
(RCNP)
Dr
Daiki NISHIMURA
(RIKEN)
Dr
Danyang PANG
(Beihang Univ.)
Prof.
Harutaka SAKAGUCHI
(RCNP)
Dr
Hiroaki MATSUBARA
(CNS, Univ. of Tokyo)
Prof.
Hiroshi TOKI
(RCNP)
Prof.
Hiroyuki OKAMURA
(RCNP)
Dr
Juzo ZENIHIRO
(RIKEN)
Prof.
Kensaku MATSUTA
(Osaka Univ.)
Prof.
Kimiko SEKIGUCHI
(Tohoku Univ.)
Mr
Kousuke HIROTA
(RCNP)
Prof.
Kyomi IKEDA
(RIKEN)
Ms
Manami TANIGUCHI
(Nara Women's Univ.)
Dr
Masaaki TAKASHINA
(RCNP)
Prof.
Masaru YOSOI
(RCNP)
Prof.
Mitsunori FUKUDA
(Osaka Univ.)
Dr
Mototsugu MIHARA
(Osaka Univ.)
Prof.
Takahiro KAWABATA
(Kyoto Univ.)
Dr
Takayuki MYO
(Osaka Institute of Technology)
Mr
Takuma NAITO
(RCNP)
Dr
Tomokazu SUZUKI
(RCNP)
Dr
Yoko OGAWA
(RCNP)
Mr
Yusuke YASUDA
(RCNP)
