Delayed decay of heavy fragments ejected from cosmic ray stars

Ciok, P.; Danysz, M.; Gierula, J.

doi:10.1007/bf02781038

Cited by 10 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If track 1 is assumed to have been produced by a triton, the residual momentum is found to be 94±1.6 Mev/c and the energy of the w° meson, 29.6±1 Mev: AHe 4 ->*+i>+7r°+<2 9 . (9) Then for this reaction the total kinetic energy is found to be 36.1 Mev and the binding energy of the A 0 particle is found to be 3.9±1 Mev. This value for the binding energy is in agreement with that found from the charged mesonic decays of AHe 4 reported by others.…”

Section: Eventmentioning

confidence: 92%

“…An energy level diagram of Be 8 and A Be 8 is shown in Fig. 6 9 . B\ is the binding energy of a A 0 particle in A Be 9 .…”

Section: Eventmentioning

confidence: 99%

“…The total energy release from the disintegration cannot be evaluated. Events 8,9,10,and 11 In these four events the connecting tracks have a range from 15 to 45 microns. Even though the range is short, the tracks appear to have been produced by nuclear fragments rather than by stopping n mesons.…”

Section: Eventmentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] In a few favorable cases the energy release from the disintegration of the fragment was found to be very close to the decay energy of the free A 0 particle. 16 From the energetics of the disintegration, an estimate of the binding energy of the A 0 particle in the fragment was obtained, and in these cases the binding was found to be comparable to or less than that of a neutron in a similar stable nucleus.…”

Section: Introductionmentioning

confidence: 99%

“…The data showed that even in nuclei containing as many as 10 nucleons, the lifetime, in comparison to that of the free A 0 particle, was not shortened by many orders of magnitude. Following a suggestion of M. Goldhaber, we propose to call a nuclear fragment containing a bound hyperon or some other unstable particle, a hyperfragment, and in specific cases we shall use the normal symbol for the nucleus with a subscript designating the type of hyperon that is bound in it; viz., a A 0 particle bound in a Be 9 nucleus would be designated as ABe 9 .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Disintegration of Hyperfragments

1955

View full text Add to dashboard Cite

A systematic search has been made for events which appear to be due to the disintegration of a hyperfragment; that is, a nuclear fragment which contains a bound unstable particle. A total of 20 000 3-Bev proton stars and 500 1.5-Bev 7r~-meson stars from the Brookhaven Cosmotron were studied as well as 9000 cosmic-ray stars. Twenty-one events which are interpreted as hyperfragments were found in the proton plates, seven in the cosmic-ray plates and one in the x-meson plates. Of the 29 disintegrations, a x meson was ejected in only two cases and a iT-meson in one event. In the remaining 26 disintegrations, only nuclear particles were emitted. The charge and energy distributions, as well as the angular distribution of the hyperfragments, have been measured. In four cases the energetics of the decay strongly indicate that the bound unstable particle was a A 0 particle. The binding of the A 0 particle was measured in these cases. In two additional cases the minimum energy release was significantly greater than the decay energy of a A 0 particle but possibly consistent with the decay energy of a charged hyperon. In one case a negative iT-meson was ejected from a secondary star. It is impossible to determine whether this secondary star was due to a fragment disintegration or the nuclear capture of a stopped particle. This event cannot be explained in terms of established unstable particles.

show abstract

Section: Eventmentioning

confidence: 92%

“…An energy level diagram of Be 8 and A Be 8 is shown in Fig. 6 9 . B\ is the binding energy of a A 0 particle in A Be 9 .…”

Section: Eventmentioning

confidence: 99%