Summary
From a group of double stars which were produced by 4.5 GeV negative pions, a selection has been made of those events with, linking tracks longer than 20 μm and which appeared to represent the non-mesonic decays, mainly, ofΛHe,ΛLi, andΛBe hyperfragments. A total of 31 hyperfragments satisfied these criteria. Prom a study of the energy distribution of the charged particles from these disintegrations, it has been found possible to separate the decays into those where the hyperon was stimulated into decaying by a neutron, from those caused by a proton. The ratio of neutron to proton stimulation is found to be about 1.4. This value may give some indications about the parity of the A hyperon and the possible transition Λ→ gS + π.
Riassunto
Da un gruppo di stelle doppie prodotte da pioni negativi di 4.5 GeV sono stati soelti gli eventi con tracce di collegamento maggiori di 20 μm che apparivano rappresentare decadimenti non mesonici, principalmente iperframmenti diΛHe,ΛLi eΛBe. Un totale di 31 iperframmenti soddisfaeeva a tali esigenze. Da uno studio della distribuzione dell’energia delle particelle cariche derivanti da tali disintegrazioni è risultato possibile separare i decadimenti in cui l’iperone era stimolato a decadere da un neutrone da quelli causati da un protone. Il rapporto della stimolazione neutronica alla protonica risulta essere circa 1.4. Questo valore è atto a dare qualche indicazione sulla parità dell’iperone A e sulla possibile transizione Λ → gS +π.
Similar content being viewed by others
References
M. Dakysz andJ. Pniewski:Phil. Mag.,44, 348 (1953).
W. P. Fry, J. Schneps andM. S. Swami:Phys. Rev.,99, 1561 (1955);101, 1526 (1956);106, 1062 (1957).
W. Cheston andH. Primakoff:Phys. Rev.,92, 1537 (1953);H. Primakoff:Nuovo Cimento,3, 1394 (1956).
M. Kuderman andR. Karplus:Phys. Rev.,102, 247 (1956).
R. H. Dalitz:Proceedings Sixth Annual Bochester Conference, p. v-40 (New York, 1956).
T. K. Fowler:Phys. Rev.,102, 844 (1956).
F. Ferrari andL. Fonda:The Stimulated decay of Bound Λ-Hyperons, appearing in this issue.
D. Lichtenberg andM. Ross:Phys. Rev.,103, 1131 (1956).
N. Dallaporta andF. Ferrari:Nuovo Cimento,5, 111 (1956).
Author information
Authors and Affiliations
Additional information
This work was presented at the Conference on Mesons and Eecently Discovered Particles, Padua-Venice, September 1957.
On leave of absence from the University of Wisconsin, Madison, Wisc, supported in part by the Atomic Energy Commission (U.S.A.) and in part by the Graduate School, University of Wisconsin.
On leave of absence from St. Paul’s University, Tokyo.
Rights and permissions
About this article
Cite this article
Baldo-Ceolin, M., Dilworth, C., Fry, W.P. et al. Stimulated decay of the a hyperon in light hyperfragments. Nuovo Cim 7, 328–337 (1958). https://doi.org/10.1007/BF02747700
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02747700