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G. Keyes; M. Derrick; T. Fields; L. G. Hyman; J. G. Fetkovich; J. McKenzie; B. Riley; I. -T. Wang

doi:10.1103/PhysRevD.1.66

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Properties of ${}_{Λ}H^{3}$

G. Keyes

M. Derrick, T. Fields^*, and L. G. Hyman

J. G. Fetkovich, J. McKenzie, B. Riley, and I. -T. Wang

Argonne National Laboratory, Argonne, Illinois 60439 and Northwestern University, Evanston, Illinois 60201

Argonne National Laboratory, Argonne, Illinois 60439

Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213

^*Also at Northwestern University, Evanston, Illinois 60201.

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Phys. Rev. D 1, 66 – Published 1 January, 1970

DOI: https://doi.org/10.1103/PhysRevD.1.66

Abstract

The properties of the hypernucleus ${}_{Λ}H^{3}$ were measured in an analysis of helium-bubble-chamber pictures taken at the Argonne ZGS. Some 90 examples of the production reaction $K^{-} + {He}^{4} \to {}_{Λ}H^{3} + p + π^{-}$ were found in which the $K^{-}$ stopped and the ${}_{Λ}H^{3}$ decayed via $π^{-}$ emission. Twenty-seven events were observed to decay via the two-body mode ${}_{Λ}H^{3} \to π^{-} {He}^{3}$ , with the remaining events decaying to $π^{-} pd$ or $π^{-} ppn$ . The production rate was measured to be ( ${1.8}_{- 0.6}^{+ 0.7}$ )× $10^{- 3}$ per stopping $K^{-}$ . The mean life of the hyper-fragment was measured from the two-body decay mode as ( ${2.64}_{- 0.52}^{+ 0.84}$ )× $10^{- 10}$ sec. The lifetime obtained from the three-body decays was consistent with this value, after the elimination of a serious source of background. The binding energy of ${}_{Λ}H^{3}$ was measured to be 0.25±0.31 MeV. The decay ratio $R_{3} = \frac{Γ ({}_{Λ}H^{3} \to π^{-} {He}^{3})}{Γ ({}_{Λ}H^{3} \to all π^{-})}$ was measured to be ${0.36}_{- 0.06}^{+ 0.08}$ , in agreement with values from previous experiments and with the value calculated for spin ½ for the ${}_{Λ}H^{3}$ hypernucleus.

References (29)

R. H. Dalitz, Nuclear Interactions of the Hyperons (Oxford University Press, London, 1965)
D. H. Davis and J. Sacton, in High-Energy Physics, edited by E. H. S. Burhop (Academic Press Inc., New York, 1967), Vol. II, p. 365
R. H. Dalitz, in Proceedings of International School of Physics "Enrico Fermi," Course XXXVIII (Academic Press Inc., New York, 1967), p. 89
M. M. Block, R. Gessaroli, S. Ratti, M. Schneeberger, L. Grimellini, T. Kikuchi, L. Lendinari, L. Monari, W. Becker, and E. Harth, in Proceedings of the Sienna Conference on Elementary Particles and High-Energy Physics, 1963, edited by G. Bernardini and G. P. Puppi (Società Italiana de Fisica, Bologna, 1963), p. 62
G. S. Keyes, Ph.D. thesis, Northwestern University, 1969 (unpublished) G. Keyes, M. Derrick, T. Fields, L. G. Hyman, J. G. Fetkovich, J. McKenzie, and I.-T. Wang, Phys. Rev. Letters 20, 819 (1968)
M. Derrick and G. S. Keyes, in Proceedings of the 1966 International Conference on Instrumentation for High-Energy Physics, 1966, p. 618 (unpublished)
G. Marmer, K. Reibel, D. M. Schwartz, A. Stevens, T. A. Romanowski, C. J. Rush, P. R. Phillips, E. C. Swallow, R. Winston, and D. Wolfe, Phys. Rev. 179, 1294 (1969) J. D. Davies, J. D. Dowell, P. M. Hatterslay, R. J. Homer, A. W. O'Dell, M. E. Sproul, A. A. Carter, K. F. Riley, R. J. Taper, D. V. Bugg, D. C. Slater, and E. J. N. Wilson, Nuovo Cimento 54, 608 (1968)
M. Derrick, T. Fields, L. Hyman, J. Loken, K. Martin, E. G. Pewitt, J. Fetkovich, and J. McKenzie, in Proceedings of the 1966 International Conference on Instrumentation for High-Energy Physics, 1966, p. 264 (unpublished)
C. Laverick and G. Lobell, Rev. Sci. Instr. 36, 825 (1965)
L. G. Hyman, J. Loken, E. G. Pewitt, M. Derrick, T. Fields, J. McKenzie, I.-T. Wang, J. Fetkovich, and G. Keyes, Phys. Letters 25B, 376 (1967) (unpublished)
Omitted endnote
B. W. Downs and R. H. Dalitz, Phys. Rev. 114, 593 (1959)
Particle Data Group, Rev. Mod. Phys. 41, 109 (1969)
J. Sacton (private communication)
R. E. Phillips and J. Schneps, Phys. Rev. Letters 20, 1383 (1968)
European $K^{-}$ collaboration (to be published)
M. Rayet and R. H. Dalitz, Nuovo Cimento 46A, 786 (1966)
R. H. Dalitz and G. Rajasekharan, Phys. Letters 1, 58 (1962)
N. N. Kolesnikov and R. V. Vedrinsky, Nuovo Cimento 43B, 301 (1966)
G. Bohm, J. Klabuhn, U. Krecker, F. Wysotski, G. Coremans, W. Gajewski, C. Mayeur, J. Sacton, P. Vilain, G. Wilquet, D. O'Sullivan, D. Stanley, D. H. Davis, E. R. Fletcher, S. P. Lovell, N. C. Roy, J. H. Wickens, A. Filipkowski, K. Garbowska-Pniewska, T. Pniewska, E. Skrzypczak, T. Sobczak, J. E. Allen, V. A. Bull, A. P. Conway, A. Fishwick, and P. V. March, Nucl. Phys. B4, 511 (1968)
K. N. Chaudhari, S. N. Ganguli, N. K. Rao, M. S. Swami, A. Gurtu, J. M. Kohli, and M. B. Singh, TIFR Report No. NE-68-8, 1968 (unpublished)
M. M. Block, R. Gessaroli, J. Kopelman, S. Ratti, M. Schneeberger, L. Grimellini, T. Kikuchi, L. Lendinara, L. Monari, W. Becker, and E. Harth, in Proceedings of the International Conference on Hyperfragments, St. Cergue, 1963 (CERN, Geneva, 1964)
M. Leon, Phys. Rev. 113, 1604 (1959)
R. G. Ammar, W. Dunn, and M. Holland, Nuovo Cimento 26, 840 (1962)
D. H. Davis and J. Sacton, in Proceedings of the International Hypernuclear Conference, Argonne National Laboratory, 1969, p. 159 (unpublished)
K. Burnell, Ph.D. thesis (unpublished)
J. W. Patrick and P. L. Jain, Nucl. Phys. 73, 681 (1965)
P. Katz, K. Bunnell, M. Derrick, T. Fields, L. G. Hyman, and G. Keyes, Phys. Rev. (to be published)
R. H. Dalitz and L. Liu, Phys. Rev. 116, 1312 (1959)

[c1] R. H. Dalitz, Nuclear Interactions of the Hyperons (Oxford University Press, London, 1965)

[c2] D. H. Davis and J. Sacton, in High-Energy Physics, edited by E. H. S. Burhop (Academic Press Inc., New York, 1967), Vol. II, p. 365

[c3] R. H. Dalitz, in Proceedings of International School of Physics "Enrico Fermi," Course XXXVIII (Academic Press Inc., New York, 1967), p. 89

[c4] M. M. Block, R. Gessaroli, S. Ratti, M. Schneeberger, L. Grimellini, T. Kikuchi, L. Lendinari, L. Monari, W. Becker, and E. Harth, in Proceedings of the Sienna Conference on Elementary Particles and High-Energy Physics, 1963, edited by G. Bernardini and G. P. Puppi (Società Italiana de Fisica, Bologna, 1963), p. 62

[c5] G. S. Keyes, Ph.D. thesis, Northwestern University, 1969 (unpublished) G. Keyes, M. Derrick, T. Fields, L. G. Hyman, J. G. Fetkovich, J. McKenzie, and I.-T. Wang, Phys. Rev. Letters 20, 819 (1968)

[c6] M. Derrick and G. S. Keyes, in Proceedings of the 1966 International Conference on Instrumentation for High-Energy Physics, 1966, p. 618 (unpublished)

[c7] G. Marmer, K. Reibel, D. M. Schwartz, A. Stevens, T. A. Romanowski, C. J. Rush, P. R. Phillips, E. C. Swallow, R. Winston, and D. Wolfe, Phys. Rev. 179, 1294 (1969) J. D. Davies, J. D. Dowell, P. M. Hatterslay, R. J. Homer, A. W. O'Dell, M. E. Sproul, A. A. Carter, K. F. Riley, R. J. Taper, D. V. Bugg, D. C. Slater, and E. J. N. Wilson, Nuovo Cimento 54, 608 (1968)

[c8] M. Derrick, T. Fields, L. Hyman, J. Loken, K. Martin, E. G. Pewitt, J. Fetkovich, and J. McKenzie, in Proceedings of the 1966 International Conference on Instrumentation for High-Energy Physics, 1966, p. 264 (unpublished)

[c9] C. Laverick and G. Lobell, Rev. Sci. Instr. 36, 825 (1965)

[c10] L. G. Hyman, J. Loken, E. G. Pewitt, M. Derrick, T. Fields, J. McKenzie, I.-T. Wang, J. Fetkovich, and G. Keyes, Phys. Letters 25B, 376 (1967) (unpublished)

[c11] Omitted endnote

[c12] B. W. Downs and R. H. Dalitz, Phys. Rev. 114, 593 (1959)

[c13] Particle Data Group, Rev. Mod. Phys. 41, 109 (1969)

[c14] J. Sacton (private communication)

[c15] R. E. Phillips and J. Schneps, Phys. Rev. Letters 20, 1383 (1968)

[c16] European $K^{-}$ collaboration (to be published)

[c17] M. Rayet and R. H. Dalitz, Nuovo Cimento 46A, 786 (1966)

[c18] R. H. Dalitz and G. Rajasekharan, Phys. Letters 1, 58 (1962)

[c19] N. N. Kolesnikov and R. V. Vedrinsky, Nuovo Cimento 43B, 301 (1966)

[c20] G. Bohm, J. Klabuhn, U. Krecker, F. Wysotski, G. Coremans, W. Gajewski, C. Mayeur, J. Sacton, P. Vilain, G. Wilquet, D. O'Sullivan, D. Stanley, D. H. Davis, E. R. Fletcher, S. P. Lovell, N. C. Roy, J. H. Wickens, A. Filipkowski, K. Garbowska-Pniewska, T. Pniewska, E. Skrzypczak, T. Sobczak, J. E. Allen, V. A. Bull, A. P. Conway, A. Fishwick, and P. V. March, Nucl. Phys. B4, 511 (1968)

[c21] K. N. Chaudhari, S. N. Ganguli, N. K. Rao, M. S. Swami, A. Gurtu, J. M. Kohli, and M. B. Singh, TIFR Report No. NE-68-8, 1968 (unpublished)

[c22] M. M. Block, R. Gessaroli, J. Kopelman, S. Ratti, M. Schneeberger, L. Grimellini, T. Kikuchi, L. Lendinara, L. Monari, W. Becker, and E. Harth, in Proceedings of the International Conference on Hyperfragments, St. Cergue, 1963 (CERN, Geneva, 1964)

[c23] M. Leon, Phys. Rev. 113, 1604 (1959)

[c24] R. G. Ammar, W. Dunn, and M. Holland, Nuovo Cimento 26, 840 (1962)

[c25] D. H. Davis and J. Sacton, in Proceedings of the International Hypernuclear Conference, Argonne National Laboratory, 1969, p. 159 (unpublished)

[c26] K. Burnell, Ph.D. thesis (unpublished)

[c27] J. W. Patrick and P. L. Jain, Nucl. Phys. 73, 681 (1965)

[c28] P. Katz, K. Bunnell, M. Derrick, T. Fields, L. G. Hyman, and G. Keyes, Phys. Rev. (to be published)

[c29] R. H. Dalitz and L. Liu, Phys. Rev. 116, 1312 (1959)

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Properties of ${}_{Λ}H^{3}$

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Properties of H3Λ

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Properties of ${}_{Λ}H^{3}$