Antiproton Interactions in Hydrogen and Carbon below 200 Mev

Agnew, L.; Elioff, T.; Fowler, W.B.; Lander, R.; Powell, Wilson M.; Segrè, E.; Steiner, H.; White, Howard S.; Wiegand, C.; Ypsilantis, T.

doi:10.1103/physrev.118.1371

Cited by 82 publications

(14 citation statements)

References 33 publications

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“…For neutral data, which are not shown in Fig. 4, we note that our measurement of (M(n~ for carbon is two standard deviations larger than that from Agnew et al [5] 1.15+0.30. To the best of our knowledge, no comparable measurement is available for uranium.…”

Section: Resultscontrasting

confidence: 61%

Charged pion spectra and energy transfer following antiproton annihilation at rest in carbon and uranium

Minor

Armstrong

Bishop

et al. 1990

Z. Physik A - Atomic Nuclei

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The momentum spectra of charged pions following antiproton annihilation at rest in carbon and uranimn have been measured. This information complements our previous measurement of the neutral pion spectra. The total charged pion multiplicity is 2.84+0.10 and 2.47+0.09 for carbon and uranium, respectively, in good agreement with recent INC model predictions of 2.96 and 2,48 for the same quantities. However, structures predicted by the model near 200 MeV/c and 300 MeV/c related to delta-resonance production are not seen in the data. The total energy transfers to the nucleus are calculated to be 119 + 59 MeV(carbon) and 455 + 50 MeV(uranium). The possibility of exciting multifragmentation with a/3 beam impinging on heavy nuclei is discussed.

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Section: Resultscontrasting

confidence: 61%

Charged pion spectra and energy transfer following antiproton annihilation at rest in carbon and uranium

Minor

Armstrong

Bishop

et al. 1990

Z. Physik A - Atomic Nuclei

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“…We are unaware of any predictions for carbon, but note that the prediction for the nearby nucleus oxygen from [13] of 260 MeV is much larger than our measured value of 75__ 53 MeV for carbon. Using the results of [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] for carbon, we calculate (E(TRANSFER)) +-,~ to be 430 + 206 MeV. Unfortunately, the error on this value makes it compatible with both our measurement for carbon and the prediction for oxygen.…”

Section: Discussionsupporting

confidence: 69%

Energy transfer by intranuclear cascade of pi-zeros produced in antiproton annihilation at rest in nuclear targets

Armstrong

Bishop

Harris

et al. 1989

Z. Physik A - Atomic Nuclei

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The energy transfer by pi-zeros in the intranuclear cascade initiated by antiproton annihilation at rest in carbon and uranium has been measured to be 28___ 43 and 232 4-33 MeV respectively. We estimate the total energy transfer due to all pions to be 75_+ 53 and 447___ 42 MeV respectively. The uranium value is ~ 17% larger than a recent theoretical prediction. No predictions for carbon are available. Given the expected increase in efficiency of energy transfer from antiproton beams at ~ 3 GeV/c momentum, the prospects for initiating multifragmentation and disintegration of heavy nuclei at these energies appear good.

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“…The physics of antiproton annihilation suggests that the major part of this energy will manifest itself as pions with a kinetic energy of the order of a few hundred MeV and hence will escape from the site of interaction. Particle track analysis from emulsion [1] and bubble chamber [2] experiments in antiproton beams have been interpreted to imply that a relatively large amount of energy could be dissipated by way of charged fragments of the nucleus on which the annihilation occurred. This local energy deposition has been estimated to be in the range 100-200 MeV [3], which can be compared with the 20 MeV or so left behind in a negative pion annihilation [4].…”

Section: Introductionmentioning

confidence: 99%

A measurement of the local energy deposition by antiprotons coming to rest in tissue-like material

Sullivan

1985

Phys. Med. Biol.

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A B S T R A C TThe measurement of the energy deposited in tissue-like plastic as a beam of low-energy antiprotons slows down is described. The resulting depth-dose curve is presented and compared to that of protons measured under similar conditions. The size of the stopping peak relative to the dose in the plateau is about twice that for protons which indicates that relatively small amounts of energy are deposited locally in an antiproton annihilation. Analysis of the data shows that out of the 2000 MeV available in an antiproton annihilation, on average less than 33 MeV is deposited close to the site of the interaction. This leads to the conclusion that antiprotons are unlikely to offer any marked advantage over other radiations for radiotherapeutic applications of the future.

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Antiproton Interactions in Hydrogen and Carbon below 200 Mev

Cited by 82 publications

References 33 publications

Charged pion spectra and energy transfer following antiproton annihilation at rest in carbon and uranium

Charged pion spectra and energy transfer following antiproton annihilation at rest in carbon and uranium

Energy transfer by intranuclear cascade of pi-zeros produced in antiproton annihilation at rest in nuclear targets

A measurement of the local energy deposition by antiprotons coming to rest in tissue-like material

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