Abstract
We have developed the neutron polarization measurement system to perform the first polarization-transfer measurement for the exclusive [Formula: see text] reaction. For the neutron polarization measurement, we have reconstructed the neutron polarimeter NPOL3. The NPOL3 system has been calibrated by using the polarized neutron from the [Formula: see text] reaction, and the resulting effective analyzing power is [Formula: see text]. For the exclusive measurement, the Large Acceptance Spectrometer (LAS) has been used for the recoil proton detection. The energy resolution of 6 MeV is achieved for separation energy, which is sufficient to separate the [Formula: see text] and [Formula: see text] orbits for light nuclei.
Highlights
Recent studies on hadron many body system are revealing that basic hadron properties would be modified in nuclear medium [1], and nucleon-nucleon (NN ) interaction might be modified in the medium
Polarized protons were produced in the HIPIS [9] and were accelerated up to Tp = 53 and 296 MeV using the azimuthally varying field (AVF) and ring cyclotrons, respectively
The outgoing neutrons were measured by the neutron polarimeter NPOL3 [10] at θNPOL = 22◦ with flight-pass length 20 m
Summary
Recent studies on hadron many body system are revealing that basic hadron properties would be modified in nuclear medium [1], and nucleon-nucleon (NN ) interaction might be modified in the medium. The data are significantly suppressed from theoretical calculations based on NN This is an Open Access article published by World Scientific Publishing Company. Polarization observables Dij for the same (p, 2p) reactions have been measured. In this case, medium effects as a function of averaged nuclear density are not observed. Ay for (p, np) reactions have been measured for 2H, 6Li, and 12C targets [8] In this case, the data are well reproduced by the theoretical calculations. In order to investigate this possible isospin dependence of the nuclear medium effects, the Dij data for the (p, np) reaction are highly desired. We performed the test experiment for the exclusive 2H(p, np) measurement to investigate the performance of the present system
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