Physics
Scientific paper
Apr 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967phrv..156.1228w&link_type=abstract
Physical Review, vol. 156, Issue 4, pp. 1228-1248
Physics
20
Scientific paper
The Cr54(p,d) and Cr54(p,t), Cr53(p,d) and (p,t), Cr53(p,p'), and Cr52(p,t) reactions were studied with 17.5-MeV protons from the Princeton FM cyclotron. Thin, essentially self supported, isotopic chromium foils were used in these experiments, the deuterons and tritons being identified by a dEdx-E solid-state-detector telescope. The total experimental resolution of this system for the various deuteron and triton groups was between 55 and 70 keV. Angular distributions for many (p,d), (p,t), and (p,p') transitions were obtained from 15° to 150°. Spectroscopic factors were determined for ln=0,1,2,and 3 (p,d) transitions, using distorted-wave Born-approximation calculations which included both finite-range and nonlocal effects. In the Cr53(p,d) reaction, both the 0+ ground state and the 1.434-MeV 2+ level in Cr52 were excited by ln=1 transitions, showing admixture in the Cr53 ground state of the configuration {(Cr52 1.434 MeV)2+2p32}32. Levels in Cr52 and Cr53 were strongly, excited in the (p,d) reaction with ln=3 angular distributions, and these transitions are ascribed to 1f72 pickup. In the Cr54(p,d)Cr53 reaction, definite J dependence was observed in both ln=1 (J=12 or 32) and ln=3 (J=52 or 72) transitions. A single ln=0 transition was found in the Cr54(p,d) reaction which seems to exhaust most of the T< spectroscopic strength. The Cr54,53,52(p,t) experiments along with the Cr53(p,d) work indicate that a large component of the 2.648-MeV 0+ level in Cr52 is a two-particle-two-hole neutron configuration. In the Cr53(p,p') reaction, the 0.563-MeV 1/2 -, 1.001-MeV 52-, 1.284-MeV 72-, and 1.967-MeV levels were strongly excited, and their angular distributions are similar to that of the Cr52(p,p')Cr52 1.434-MeV 2+ transition. The results of the Cr54(p,d), Cr53(p,d), and Cr53(p,p') experiments are used in conjunction with the weak-coupling model and the theoretical model calculations of Maxwell and Parkinson and of Ramavataram to discuss the structure of the low-lying levels of Cr53.
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