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College Physics (Urone)
Found in: Page 1210
College Physics (Urone)

College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

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Short Answer

What lifetime do you expect for an antineutron isolated from normal matter?

The lifetime of an antineutron isolated from normal matter is small and stable without any change.

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Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1: Antineutron

The antineutron is the antiparticle of the neutron. It only varies from the neutron in that certain of its characteristics have the same magnitude as the neutron but have the opposite sign.

Step 2: Lifetime of Antineutron

The usual short life of an antineutrino is due to its reactive nature with normal matter, as particles and antiparticles tend to annihilate. If an antineutrino were isolated from normal matter, it would behave equivalently to a usual neutrino, so we would expect it to be stable, as there are no lower energy states for it to decay to.

Therefore, the lifetime of antineutron is very short.

Most popular questions for Physics Textbooks

(a) Is the decay \({\sum ^{\rm{ - }}} \to {\rm{n + }}{\pi ^{\rm{ - }}}\) possible considering the appropriate conservation laws? State why or why not.

(b) Write the decay in terms of the quark constituents of the particles.

Verify the quantum numbers given for the \({{\rm{\Omega }}^{\rm{ + }}}\) in Table \(33.2\) by adding the quantum numbers for its quark constituents as inferred from Table \(33.4\).

(a) What is the uncertainty in the energy released in the decay of a \(\tau {\rm{ }} - \)due to its short lifetime?

(b) Is the uncertainty in this energy greater than or less than the uncertainty in the mass of the tau neutrino? Discuss the source of the uncertainty.

Accelerators such as the Triangle Universities Meson Facility (TRIUMF) in British Columbia produce secondary beams of pions by having an intense primary proton beam strike a target. Such "meson factories" have been used for many years to study the interaction of pions with nuclei and, hence, the strong nuclear force. One reaction that occurs is\({{\rm{\pi }}^{\rm{ + }}}{\rm{ + p}} \to {{\rm{\Delta }}^{{\rm{ + + }}}} \to {{\rm{\pi }}^{\rm{ + }}}{\rm{ + p}}\), where the \({{\rm{\Delta }}^{{\rm{ + + }}}}\)is a very short-lived particle. The graph in Figure \({\rm{33}}{\rm{.26}}\)shows the probability of this reaction as a function of energy. The width of the bump is the uncertainty in energy due to the short lifetime of the\({{\rm{\Delta }}^{{\rm{ + + }}}}\).

(a) Find this lifetime.

(b) Verify from the quark composition of the particles that this reaction annihilates and then re-creates a d quark and a \({\rm{\bar d}}\)antiquark by writing the reaction and decay in terms of quarks.

(c) Draw a Feynman diagram of the production and decay of the \({{\rm{\Delta }}^{{\rm{ + + }}}}\)showing the individual quarks involved.

Discuss how we know that \[{\rm{\pi }}\]-mesons\[\left( {{{\rm{\pi }}^{\rm{ + }}}{\rm{,\pi ,}}{{\rm{\pi }}^{\rm{0}}}} \right)\]) are not fundamental particles and are not the basic carriers of the strong force.
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