Electron capture Q value of {sup 179}Ta
- and others
There is a discrepancy in the measured electron capture Q value of {sup 179}Ta; from the EC(L)/EC(K) capture ratio of Bisi et al.one obtains Q = 103{plus_minus}6 keV, while the ratio measured by Jopson et al. gives Q = 121 {plus_minus} 7 keV. To resolve this discrepancy we have remeasured the L to K capture ratio. A {sup 179}Ta source was produced by bombarding a natural Hf target with 20-MeV protons from LBL`s 88-inch cyclotron, and, after a suitable delay, extracted radiochemically from the Hf. The L x rays were counted in a planar Ge detector (FWHM = 280 eV at 8 keV) and the K x rays in a well-type NaI detector. From the ratio of L x rays in anti-coincidence with K x rays to those in coincidence with them we deduce a Q value of 111.2 {plus_minus} 1.9 keV. This value is in agreement with the recommended value of 110 {plus_minus} 5 keV found in the latest Evaluated Nuclear Structure Data File.
- DOE Contract Number:
- FG05-87ER40314
- OSTI ID:
- 255592
- Report Number(s):
- CONF-9510116-; ISSN 0003-0503; TRN: 96:015905
- Journal Information:
- Bulletin of the American Physical Society, Vol. 40, Issue 10; Conference: Fall meeting of the Division of Nuclear Physics of the American Physical Society, Bloomington, IN (United States), 25-28 Oct 1995; Other Information: PBD: Oct 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
RADIOACTIVITY OF $sup 178$Ta, $sup 179$Ta AND $sup 180$Ta
Electron capture probability in the decay of /sup 151/Gd and /sup 181/W