Document Type

Article

Publication Date

11-2015

Abstract

The spallation neutron source at the Los Alamos Neutron Science Center Weapons Neutron Research facility was used to populate excited states in 186Re via (n,2nγ) reactions on an enriched 187Re target. Gamma rays were detected with the GErmanium Array for Neutron Induced Excitations spectrometer, a Compton-suppressed array of 18 HPGe detectors. Incident neutron energies were determined by the time-of-flight technique and used to obtain γ-ray excitation functions for the purpose of identifying γ rays by reaction channel. Analysis of the singles γ-ray spectrum gated on the neutron energy range 10≤En≤25MeV resulted in five transitions and one level added to the 186Re level scheme. The additions include the placement of three γ rays at 266.7, 381.2, and 647.7 keV which have been identified as feeding the 2.0×105yr, Jπ=(8+) isomer and yield an improved value of 148.2(5)keV for the isomer energy. These transitions may have astrophysical implications related to the use of the Re-Os cosmochronometer. Abstract © APS.

Comments

This record sources the open access CHORUS-furnished accepted manuscript (post-print) version of the article. A 12-month embargo was observed for this posting in accordance with the publisher and the research funding body.

The publisher reserves all rights on this article. ©2015 American Physical Society

The publisher version of record is a subscription-access article, appearing as cited below in volume 92 of Physical Review C, hosted at APS. Readers outside of AFIT will need to access the article through their own digital subscription to that periodical. AFIT readers can reach the final article through AFIT Off-Campus Access.

Plain text title: New transitions and feeding of the Jπ=(8+) isomer in Re 186

DOI

10.1103/PhysRevC.92.054304

Source Publication

Physical Review C - Nuclear Physics

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Nuclear Commons

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