PHENIX measurements are presented for the cross section and double-helicity asymmetry (ALL) in inclusive π 0 production at midrapidity from p+p collisions at √ s = 510 GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbativequantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The π 0 ALL results follow an increasingly positive asymmetry trend with pT and √ s with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on π 0 and jet ALL, and suggested a positive contribution of gluon polarization to the spin of the proton ∆G for the gluon momentum fraction range x > 0.05. The data presented here extend to a currently unexplored region, down to x ∼ 0.01, and thus provide additional constraints on the value of ∆G.

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Stress-induced acicular martensites in Cu-14.2Al-4.3Ni (wt %) alloy were investigated by means of transmission spear-like martensite thermally formed in the same alloy in several respects such as in shape, lattice invariant shear, habit plane and orientation relationship, even though both have the same crystal structure and lattice parameters. The lattice invariant strain of the martensite was found to be stacking faults on the basal plane, and a defectless region was observed at the middle of the martensite, which is in sharp contrast to the midribs in ferrous twinned martensites. The habit plane

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The stress-induced acicular martensites in a (wt %) alloy were investigated extensively by the method of electron microscopy and selected area electron diffraction. As a result two types of martensites were found; martensite was much less compared to that of the former. In the present paper the structure analysis and crystallographic meters were a=4.382 A, b=5.356 A and c=38.00 A. (2) The internal defects of the martensite was essentially stacking relationship between matrix and martensite was consistent with the Kajiwara-Nishiyama relationship found in the therbelow the Ms temperature. (7) The crystallography of similar martensites formed in thin films was discussed in relation to that in bulk specimens.