Nuclear excitation of In115 by positron annihilation with K-shell electrons

Yoshihisa Watanabe, T. Mukoyama, Sakae Shimizu

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

When a positron annihilates with a K-shell electron, the excess liberated may be given to the nucleus involved. In the case when this energy is just the right energy for any excited state within its level width of a fraction of an electron volt, nuclear excitation can be expected, and if the excited level cascades down to an isomeric state with appreciable lifetime we can confirm the occurrence of this annihilation mode by observing transitions or conversion electrons from this isomeric level. In the present work we observed rays from Inm115 after irradiation of natural indium foils by positrons from the + decay of Cu64. Using the observed induced activity of Inm115 and assuming this phenomenon to be the two-step process, we have evaluated the cross sections of nuclear excitation by positron annihilation for 1078- and 1464-keV levels of In115; (3.91.4)×10-24 cm2 and (1.40.5)×10-22 cm2, respectively. NUCLEAR REACTIONS In115; evaluated excitation cross sections for 1078- and 1464-keV levels by positron annihilation with K-shell electrons.

Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalPhysical Review C - Nuclear Physics
Volume19
Issue number1
DOIs
Publication statusPublished - 1979

Fingerprint

positron annihilation
excitation
electrons
positrons
cross sections
indium
foils
rays
cascades
occurrences
life (durability)
irradiation
nuclei
energy
decay

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Nuclear excitation of In115 by positron annihilation with K-shell electrons. / Watanabe, Yoshihisa; Mukoyama, T.; Shimizu, Sakae.

In: Physical Review C - Nuclear Physics, Vol. 19, No. 1, 1979, p. 32-37.

Research output: Contribution to journalArticle

@article{e1d11a1d56d543419847096994a7b194,
title = "Nuclear excitation of In115 by positron annihilation with K-shell electrons",
abstract = "When a positron annihilates with a K-shell electron, the excess liberated may be given to the nucleus involved. In the case when this energy is just the right energy for any excited state within its level width of a fraction of an electron volt, nuclear excitation can be expected, and if the excited level cascades down to an isomeric state with appreciable lifetime we can confirm the occurrence of this annihilation mode by observing transitions or conversion electrons from this isomeric level. In the present work we observed rays from Inm115 after irradiation of natural indium foils by positrons from the + decay of Cu64. Using the observed induced activity of Inm115 and assuming this phenomenon to be the two-step process, we have evaluated the cross sections of nuclear excitation by positron annihilation for 1078- and 1464-keV levels of In115; (3.91.4)×10-24 cm2 and (1.40.5)×10-22 cm2, respectively. NUCLEAR REACTIONS In115; evaluated excitation cross sections for 1078- and 1464-keV levels by positron annihilation with K-shell electrons.",
author = "Yoshihisa Watanabe and T. Mukoyama and Sakae Shimizu",
year = "1979",
doi = "10.1103/PhysRevC.19.32",
language = "English",
volume = "19",
pages = "32--37",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "1",

}

TY - JOUR

T1 - Nuclear excitation of In115 by positron annihilation with K-shell electrons

AU - Watanabe, Yoshihisa

AU - Mukoyama, T.

AU - Shimizu, Sakae

PY - 1979

Y1 - 1979

N2 - When a positron annihilates with a K-shell electron, the excess liberated may be given to the nucleus involved. In the case when this energy is just the right energy for any excited state within its level width of a fraction of an electron volt, nuclear excitation can be expected, and if the excited level cascades down to an isomeric state with appreciable lifetime we can confirm the occurrence of this annihilation mode by observing transitions or conversion electrons from this isomeric level. In the present work we observed rays from Inm115 after irradiation of natural indium foils by positrons from the + decay of Cu64. Using the observed induced activity of Inm115 and assuming this phenomenon to be the two-step process, we have evaluated the cross sections of nuclear excitation by positron annihilation for 1078- and 1464-keV levels of In115; (3.91.4)×10-24 cm2 and (1.40.5)×10-22 cm2, respectively. NUCLEAR REACTIONS In115; evaluated excitation cross sections for 1078- and 1464-keV levels by positron annihilation with K-shell electrons.

AB - When a positron annihilates with a K-shell electron, the excess liberated may be given to the nucleus involved. In the case when this energy is just the right energy for any excited state within its level width of a fraction of an electron volt, nuclear excitation can be expected, and if the excited level cascades down to an isomeric state with appreciable lifetime we can confirm the occurrence of this annihilation mode by observing transitions or conversion electrons from this isomeric level. In the present work we observed rays from Inm115 after irradiation of natural indium foils by positrons from the + decay of Cu64. Using the observed induced activity of Inm115 and assuming this phenomenon to be the two-step process, we have evaluated the cross sections of nuclear excitation by positron annihilation for 1078- and 1464-keV levels of In115; (3.91.4)×10-24 cm2 and (1.40.5)×10-22 cm2, respectively. NUCLEAR REACTIONS In115; evaluated excitation cross sections for 1078- and 1464-keV levels by positron annihilation with K-shell electrons.

UR - http://www.scopus.com/inward/record.url?scp=0002866332&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002866332&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.19.32

DO - 10.1103/PhysRevC.19.32

M3 - Article

VL - 19

SP - 32

EP - 37

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 1

ER -