Negative pion capture by medium nuclei in the Z ≈ 50 region

Butsev, V.S.; Chultém, D.; Gavrilov, Yu.K.; Ganzorig, Dz.; Presperin, V.

doi:10.1016/0375-9474(77)90641-8

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…It should be pointed out that in this calculation the target spin and the angular momentum of n at the moment of the capture was not cosidered. A good agreement with the theoretical prediction was found experimentally [10,11]. However, these results are in serious discrepancy with the findings of Beetz et al [-13].…”

Section: Isomeric Yield Ratiossupporting

confidence: 73%

Nuclear reactions induced by stopped negative pions in133Cs,93Nb and45Sc

et al. 1980

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The absorption of stopped negative pions in 133Cs, 93Nb and ~5Sc has been investigated by means of activation technique. The gamma ray spectra of the obtained activities have been measured with a Ge(Li)-spectrometer. The yields of residual radioactive isotopes have been determined. In addition, the yield of the reaction ~33Cs(re-,p)a32I has been determined to be (2.0_+0.8) x 10 -5 per stopped pion. Isomeric yield ratios have been deduced for the isomeric pairs 86,,,gy and 87m, gy. On the basis of the obtained results absorption mechanisms are discussed.

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Section: Isomeric Yield Ratiossupporting

confidence: 73%

Nuclear reactions induced by stopped negative pions in133Cs,93Nb and45Sc

et al. 1980

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“…If the absorption takes place in the * Present address: Natuurkundig Laboratorium der Vrije Universiteit, Amsterdam ** On leave from the Institute of Nuclear Physics Research, Amsterdam nuclear surface region, one of the nucleons is likely to escape the nucleus, which may result in a large nuclear angular momentum change. The other nucleon, when captured by the nucleus, causes a considerable nuclear excitation followed by the evaporation of nucleons, predominantly neutrons [5] with a maximum number of about [8][9]. If the absorption takes place in the interior of the nucleus the emission of a larger number of evaporation neutrons is possible (maximum number --~17, see [6,14] however, the angular momentum should be smaller.…”

Section: Introductionmentioning

confidence: 99%

High spin states and neutron multiplicities after pion capture in181Ta and209Bi

Beetz¹,

Boer²,

Panman³

et al. 1978

Z Physik A

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The absorption of stopped n in 181Ta and 2~ has been investigated by studying prompt and delayed 7-ray spectra. Absolute cross-sections for the yield of isotopes per captured n-in (n-, xn) reactions, as well as the relative probability of populating nuclear states of different spins have been measured for the hafnium and lead isotopes, respectively. A spin as high as 20 has been observed in the production of 2~ The ground-state rotational bands of the hafnium isotopes are excited to spin values up to 16. Neutron multiplicities as large as 15 have been observed for both targets. A neutron multiplicity of -8 is most probable for both tantalum and bismuth targets. The strong interaction monopole energy shift e o and width F o for the 4f level are found to be e0(~81Ta)=540+100 eV; ~o(2~ 1790_+150 eV; Fo(181Ta)=225 +57 eV; F0(2~ = 1166 _+ 70 eV. The quadrupole moments, determined from the hyperfine splitting of the 4f pionic atom level, are Q=3.30+0.06b and Q=-0.50+0.08b for 181Ta and 2~ respectively.

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