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Title: Spectroscopy of Superheavy Hydrogen Isotopes in Stopped-Pion Absorption by Nuclei

Abstract

The structure of levels of superheavy hydrogen isotopes {sup 4-6}H is analyzed on the basis of a record statistics of experimental data on the absorption of negatively charged pions by light nuclei. Qualitatively new experimental data are obtained for the spectroscopy of the superheavy hydrogen isotopes {sup 5}H and {sup 6}H. Peaks due to four resonance states of {sup 5}H are observed in the missing-mass spectra for the reaction channels {sup 9}Be({pi}{sup -}, pt)X and {sup 9}Be({pi}{sup -}, dd)X. A structure that is associated with four resonance states of {sup 6}H is observed in the missing-mass spectra for the reaction channels {sup 9}Be({pi}{sup -}, pd)X and {sup 11}B({pi}{sup -}, p{sup 4}He)X. On the basis of the results presented for ground-state parameters, it can be concluded that the binding energy of superheavy hydrogen isotopes decreases as the number of neutrons increases. Excited levels of the isotopes {sup 5}H and {sup 6}H are observed for the first time. On the energy scale, all of these states lie above the threshold for decay to free nucleons.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. Moscow State Engineering Physics Institute (State University), Kashirskoe sh. 31, Moscow, 115409 (Russian Federation)
Publication Date:
OSTI Identifier:
20692765
Resource Type:
Journal Article
Journal Name:
Physics of Atomic Nuclei
Additional Journal Information:
Journal Volume: 68; Journal Issue: 3; Other Information: Translated from Yadernaya Fizika, ISSN 0044-0027, 68, 520-526 (No. 3, 2005); DOI: 10.1134/1.1891200; (c) 2005 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); TN:; Journal ID: ISSN 1063-7788
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ABSORPTION; ALPHA PARTICLES; BERYLLIUM 9 TARGET; BINDING ENERGY; ENERGY-LEVEL TRANSITIONS; EXCITED STATES; GROUND STATES; HYDROGEN 5; HYDROGEN 6; MISSING-MASS SPECTRA; NEUTRONS; NUCLEAR DECAY; PION MINUS REACTIONS; PION-NUCLEON INTERACTIONS; PROTONS; RESONANCE; TRITONS

Citation Formats

Gurov, Yu.B., Aleshkin, D.V., Behr, M.N., Lapushkin, S.V., Morokhov, P.V., Pechkurov, V.A., Poroshin, N.O., Sandukovsky, V.G., Tel'kushev, M.V., Chernyshev, B.A., and Tschurenkova, T.D. Spectroscopy of Superheavy Hydrogen Isotopes in Stopped-Pion Absorption by Nuclei. United States: N. p., 2005. Web. doi:10.1134/1.1891200.
Gurov, Yu.B., Aleshkin, D.V., Behr, M.N., Lapushkin, S.V., Morokhov, P.V., Pechkurov, V.A., Poroshin, N.O., Sandukovsky, V.G., Tel'kushev, M.V., Chernyshev, B.A., & Tschurenkova, T.D. Spectroscopy of Superheavy Hydrogen Isotopes in Stopped-Pion Absorption by Nuclei. United States. doi:10.1134/1.1891200.
Gurov, Yu.B., Aleshkin, D.V., Behr, M.N., Lapushkin, S.V., Morokhov, P.V., Pechkurov, V.A., Poroshin, N.O., Sandukovsky, V.G., Tel'kushev, M.V., Chernyshev, B.A., and Tschurenkova, T.D. Tue . "Spectroscopy of Superheavy Hydrogen Isotopes in Stopped-Pion Absorption by Nuclei". United States. doi:10.1134/1.1891200.
@article{osti_20692765,
title = {Spectroscopy of Superheavy Hydrogen Isotopes in Stopped-Pion Absorption by Nuclei},
author = {Gurov, Yu.B. and Aleshkin, D.V. and Behr, M.N. and Lapushkin, S.V. and Morokhov, P.V. and Pechkurov, V.A. and Poroshin, N.O. and Sandukovsky, V.G. and Tel'kushev, M.V. and Chernyshev, B.A. and Tschurenkova, T.D.},
abstractNote = {The structure of levels of superheavy hydrogen isotopes {sup 4-6}H is analyzed on the basis of a record statistics of experimental data on the absorption of negatively charged pions by light nuclei. Qualitatively new experimental data are obtained for the spectroscopy of the superheavy hydrogen isotopes {sup 5}H and {sup 6}H. Peaks due to four resonance states of {sup 5}H are observed in the missing-mass spectra for the reaction channels {sup 9}Be({pi}{sup -}, pt)X and {sup 9}Be({pi}{sup -}, dd)X. A structure that is associated with four resonance states of {sup 6}H is observed in the missing-mass spectra for the reaction channels {sup 9}Be({pi}{sup -}, pd)X and {sup 11}B({pi}{sup -}, p{sup 4}He)X. On the basis of the results presented for ground-state parameters, it can be concluded that the binding energy of superheavy hydrogen isotopes decreases as the number of neutrons increases. Excited levels of the isotopes {sup 5}H and {sup 6}H are observed for the first time. On the energy scale, all of these states lie above the threshold for decay to free nucleons.},
doi = {10.1134/1.1891200},
journal = {Physics of Atomic Nuclei},
issn = {1063-7788},
number = 3,
volume = 68,
place = {United States},
year = {2005},
month = {3}
}