The K-shell ionization probability Pκ has been measured as a function of Ep across the strong 2.534 MeV resonance in the reaction 56Fe(p, p)56Fe. It varies by about 50%. For the present unprecedentedly large ratio Uϰ/gG ⩾ 5, this experimental result is still in good agreement with theoretical calculations based on Blair and Anholt's formula.

In order to explore the Jπ=1+; T=1 states in 40Ca between 11.0 and 12.0MeV, which have been predicted recently, the measurements of the 39K(p,γ)40Ca reaction have been taken. Nine-resonances appeared in the region Ep=2.7-3.8MeV, and six of them corresponding to Ep=2749, 3085, 3135, 3202, 3417 and 3708ke were observed for the first time with the (p,γ) reaction. The spin, parity and isospin of the 11.083MeV state in 40Ca are determined to be Jπ=1+; T=1. The M1 transition strength B(M1)uparrow- of this state from the ground state is 0.24μ02. The result is qualitatively in agreement with the the oretical prediction.

The projectile energy dependence of K-shell ionization probability have been measured across the narrow resonance 2.522Mev with large ratio of Uk/Γ=5.3 in the reaction 56Fe(p, p) 56Fe. The frame work of the theory proposed by Blair and Anholt was introduced to analyze the results.

This paper presents the experimental result of K-shell ionization probability over 2.52 MeV p-wave narrow resonance in the reaction of 56Fe(P, P0)56Fe. The 50% modification of KX-ray emission probability on resonance relative to off resonance has been clearly observed. It indicates that with the ratio UK/Γ as large as 5.3, the interference between the incoming and outgoing target K-shell ionization amplitudes in an atomic collision still exists. From the comparison of calculation based on theoretical formula of Blair and Anholt with the experimental result. The imaginary part of the atomic monopole amplitude Imb0 was deduced and the R0=Imb0/Reb0 was obtained as +1.8.

In order to explore the Jπ=1+; T=1 states in 40Ca between 11.0 and 12.0MeV, which have been predicted recently, the measurements of the 39K(p,γ)40Ca reaction have been taken. Nine-resonances appeared in the region Ep=2.7-3.8MeV, and six of them corresponding to Ep=2749, 3085, 3135, 3202, 3417 and 3708ke were observed for the first time with the (p,γ) reaction. The spin, parity and isospin of the 11.083MeV state in 40Ca are determined to be Jπ=1+; T=1. The M1 transition strength B(M1)uparrow- of this state from the ground state is 0.24μ02. The result is qualitatively in agreement with the the oretical prediction.

We report a preliminary measurement of coincident neutron-proton pairs emitted at 45° in the interaction of 400, 530, and 650 MeV/A neon beams incident on uranium. Charged particles were identified by time of flight and momentum, as determined in a magnetic spectrometer. Neutral particles were detected using a thick plastic scintillator, and their time of flight was measured between an entrance scintillator, triggered by a charged particle, and the neutron detector. The scatter plots and contour plots of neutron momentum vs. proton momentum appear to show a slight correlation ridge above an uncorrelated background. The projections of this plane on then-p momentum difference axis are essentially flat, showing a one standard deviation enhancement for each of the three beams energies. At each beam energy, the calculated momentum correlation function for the neutron-proton pairs is enhanced near zero neutron-proton momentum difference by approximately one standard deviation over the expected value for no correlation. This enhancement is expected to occur as a consequence of the attractive final state interaction between the neutron and proton (i.e., virtual or “singlet” deuterons). The implications of these measurements are discussed.