Observation of the exotic nucleus <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>145</mn></mrow></msup></mrow><mi mathvariant="normal">Tm</mi></math></span> via its direct proton decay

J. C. Batchelder; C. R. Bingham; K. Rykaczewski; K. S. Toth; T. Davinson; J. A. McKenzie; P. J. Woods; T. N. Ginter; C. J. Gross; J. W. McConnell; E. F. Zganjar; J. H. Hamilton; W. B. Walters; C. Baktash; J. Greene; J. F. Mas; W. T. Milner; S. D. Paul; D. Shapira; X. J. Xu; C. H. Yu

doi:10.1103/PhysRevC.57.R1042

Rapid Communication

Observation of the exotic nucleus $^{145} Tm$ via its direct proton decay

J. C. Batchelder, C. R. Bingham, K. Rykaczewski, K. S. Toth, T. Davinson, J. A. McKenzie, P. J. Woods, T. N. Ginter, C. J. Gross, J. W. McConnell, E. F. Zganjar, J. H. Hamilton, W. B. Walters, C. Baktash, J. Greene, J. F. Mas, W. T. Milner, S. D. Paul, D. Shapira, X. J. Xu, and C. H. Yu

Phys. Rev. C 57, R1042(R) – Published 1 March 1998

Abstract

Proton emission from $^{145} Tm$ was observed for the first time via the $^{92} Mo (^{58} Ni, p 4 n)$ reaction, using the Holifield Radioactive Ion Beam Facility Recoil Mass Spectrometer in conjunction with a double-sided Si strip detector at the focal plane. The measured energy of the emitted proton is 1.728(10) MeV and its half-life is 3.5(10) μs, the shortest ever observed for ground-state proton radioactivity. When compared to the calculated WKB half-life for an $l = 5$ transfer, the spectroscopic factor is 0.51(16), which is consistent with the value of 0.64 calculated via the BCS approximation for a spherical nucleus. Also, the half-life of $^{113} Cs$ was determined with a greater precision than previously available to be 16.7(7) μsec.

Received 1 December 1997

DOI:https://doi.org/10.1103/PhysRevC.57.R1042

Authors & Affiliations

J. C. Batchelder¹, C. R. Bingham^2,3, K. Rykaczewski^2,4, K. S. Toth², T. Davinson⁵, J. A. McKenzie⁵, P. J. Woods⁵, T. N. Ginter⁶, C. J. Gross^2,7, J. W. McConnell², E. F. Zganjar⁸, J. H. Hamilton⁶, W. B. Walters⁹, C. Baktash², J. Greene¹⁰, J. F. Mas², W. T. Milner², S. D. Paul², D. Shapira², X. J. Xu^3,11,12, and C. H. Yu²

¹UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831
²Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
³University of Tennessee, Knoxville, Tennessee 37996
⁴Warsaw University, 00681 Warsaw, Hoza 69, Poland
⁵University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
⁶Vanderbilt University, Nashville, Tennessee 37235
⁷Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831
⁸Louisiana State University, Baton Rouge, Louisiana 70803
⁹University of Maryland, College Park, Maryland 20742
¹⁰Argonne National Laboratory, Argonne, Illinois 60439
¹¹Institute of Modern Physics, Lanzhou, 730000, China
¹²Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831

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Vol. 57, Iss. 3 — March 1998

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