Speaker
Dr
Yassid Ayyad
(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.)
Description
The transfer of a neutron-proton pair from even-even to odd-odd self-conjugate nuclei stands out as the best tool to investigate np correlations being (p,$^{3}$He) and ($^{3}$He,p) the reaction of choice with high sensitivity. The exclusive cross sections populating to the lowest $J^{\Pi}=0^{+}, 1^{+}$ states in the odd-odd $N=Z$ nuclei and the corresponding $\sigma(J^{\Pi}=0^{+})/\sigma(J^{\Pi}=1^{+})$ provide a model-independent approach to quantify the nature and interplay between $T$=0 ($J$=1) and $T$=1 ($J$=0) pairing correlations.
Nevertheless, the existing data concerning the $\sigma(J^{\Pi}=0^{+})/\sigma(J^{\Pi}=1^{+})$ ratio present clear inconsistencies in the trends across the sd-shell. These problems may be associated to the fact that the measurements were performed in different experimental conditions. Moreover, for some of the previous data no cross sections were obtained at forward angles and even in some of these measurements the absolute cross sections were not determined. In order to shed light to these discrepancies, we conducted an experiment at Research Center for Nuclear Physics (RCNP - Osaka University) to perform a series of systematic measurements of ($p$,$^{3}$He) and ($^{3}$He,$p$) on $^{24}$Mg, $^{32}$S, $^{28}$Si and $^{40}$Ca targets. In addition, the joint analysis of the proposed systematic measurements will help to complete the understanding of using both np-pair stripping and pickup transfer mechanism for probing np pairing correlations. The systematics data sets are compared with predictions from the reaction framework coupled with structure model to evaluate the microscopic description of np pairing correlations in this region.
Primary author
Dr
Yassid Ayyad
(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.)
Co-authors
Prof.
Alex B. Brown
(NSCL and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA)
Prof.
Atsushi Tamii
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
Dr
Augusto Macchiavelli
(Lawrence Berkeley National Laboratory)
Dr
Ela Ganioglu
(Science Faculty, Istanbul University, Turkey)
Ms
Gulfem Susoy
(Science Faculty, Istanbul University, Turkey)
Dr
Hirohiko Fujita
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
Dr
Hooi Jin Ong
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
Dr
Jenny Lee
(The University of Hong Kong)
Dr
José A. Lay
(Università di Padova - INFN Sezione di Padova)
Dr
Juzo Zenihiro
(Center for Nuclear Study, University of Tokyo)
Dr
Kenjiro Miki
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
Prof.
Kichiji Hatanaka
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
Prof.
Nori Aoi
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
Prof.
Takahiro Kawabata
(Dep. of Physics, Kyoto University, Japan)
Dr
Takashi Hashimoto
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
Prof.
Yoshitaka Fujita
(Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka, 567-0047, Japan)
