Negative pion capture in mercury, gold and platinum nuclei

Abazov, V. M.; Avramov, S.; Butsev, V.S.; Cherevatenko, E.P.; Chultém, D.; Fromm, W.D.; Ganzorig, Dz.; Gavrilov, Yu.K.; Polikanov, S.M.

doi:10.1016/0375-9474(76)90213-x

Cited by 11 publications

(3 citation statements)

References 7 publications

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“…[23] should give information about the probability of the absorption on np-and pp-pairs. Although the ratio of the intensity of the (re ,xn)-reactions to that of the (~ ,pxn)-reactions (133Cs) agrees well with the results for heavier nuclei the isobaric yield ratio for 133Cs (~-, 10n, p9n) was found to be 0.65_+0.25 whereas for 169Tm(~z-,10n, p9n) it is 9.9_+2.9 [25].…”

Section: Neutron Multiplicitysupporting

confidence: 76%

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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: Neutron Multiplicitysupporting

confidence: 76%

“…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: 75%

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

et al. 1980

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“…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. Two observables relevant to these features of the pion capture process are thus the number of emitted neutrons x (neutron multiplicity) in a (Tc-,xn) reaction and the nuclear angular momentum I.…”

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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Reaction Products Following Pion Capture

Walter

1977

Experientia Supplementum

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Negative pion capture in mercury, gold and platinum nuclei

Cited by 11 publications

References 7 publications

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

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

High spin states and neutron multiplicities after pion capture in181Ta and209Bi

Reaction Products Following Pion Capture

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