Discovery of Two Isotopes, <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Be</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>14</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">B</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>17</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>, at the Limits of Particle Stability

J. D. Bowman; A. M. Poskanzer; R. G. Korteling; G. W. Butler

doi:10.1103/PhysRevLett.31.614

Discovery of Two Isotopes, ${}^{14}{Be}$ and ${}^{17}B$ , at the Limits of Particle Stability

J. D. Bowman, A. M. Poskanzer, R. G. Korteling, and G. W. Butler

Phys. Rev. Lett. 31, 614 – Published 27 August 1973

Abstract

We have used $Δ E - E$ and time-of-flight techniques to observe the products of the interaction of 4.8-GeV protons with a uranium target. Two new isotopes, ${}^{14}{Be}$ and ${}^{17}B$ , were observed to be particle stable, and two others, ${}^{12}{Li}$ and ${}^{16}B$ , were shown to be particle unstable. The new isotope ${}^{17}B$ recently had been predicted to be particle stable, but the observation of ${}^{14}{Be}$ was surprising because it was thought to be unstable on the basis of both theoretical predictions and previous experimental results.

Received 25 June 1973

DOI:https://doi.org/10.1103/PhysRevLett.31.614

Authors & Affiliations

J. D. Bowman^*, A. M. Poskanzer, R. G. Korteling^†, and G. W. Butler^‡

Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

^*Present address: Los Alamos Scientific Laboratory, Los Alamos, N. Mex. 87544.
^†Permanent address: Simon Fraser University, Burn aby, B. C., Canada.
^‡Permanent address: Los Alamos Scientific Laboratory, Los Alamos, N. Mex. 87544.