APS » PROLA » Phys. Rev. Lett. » Volume 82 » Issue 4

Phys. Rev. Lett. 82, 695 - 698 (1999)

Accelerated Emission of Gamma Rays from the 31-yr Isomer of 178Hf Induced by X-Ray Irradiation
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C. B. Collins, F. Davanloo, M. C. Iosif, R. Dussart *, and J. M. Hicks
Center for Quantum Electronics, University of Texas at Dallas, Richardson, Texas 75083

S. A. Karamian
Joint Institute for Nuclear Research, Dubna, 141980, Russia

C. A. Ur and I. I. Popescu
H. Hulubei National Institute of Physics and Nuclear Engineering and RC-IGE Foundation, Bucharest, Romania

V. I. Kirischuk
Scientific Center “Institute for Nuclear Research,” Kiev, Ukraine

J. J. Carroll
Center for Photon Induced Processes, Youngstown State University, Youngstown, Ohio 44555

H. E. Roberts
System Technology Group, SRS Technologies, Huntsville, Alabama 35812

P. McDaniel
Air Force Research Laboratory, DEPA, Kirtland Air Force Base, Albuquerque, New Mexico 87117

C. E. Crist
Sandia National Laboratory, Albuquerque, New Mexico 87185

Featured in Physics News Update Received 29 October 1998

A sample of 6.3×1014 nuclei of the 4-quasiparticle isomer of 178Hf having a half-life of 31 yr and excitation energy of 2.446 MeV was irradiated with x-ray pulses from a device typically used in dental medicine. It was operated at 15 mA to produce bremsstrahlung radiation with an end point energy set to be 70 or 90 keV. Spectra of the isomeric target were taken with a high purity Ge detector. Intensities of selected transitions in the normal decay cascade of the 178Hf isomer were found to increase by about 4%. Such an accelerated decay is consistent with an integrated cross section of 1×10-21 cm 2 keV for the resonant absorption of x rays to induce gamma decay.


©1999 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v82/p695
DOI: 10.1103/PhysRevLett.82.695
PACS: 25.20.Dc, 21.10.Ma, 21.10.Tg, 27.70.+q

* Present address: GREMI, CNRS—Universite d'Orleans, BP 6759, 45067 Orleans Cedex 2, France.

See Also

Comment: P. von Neumann-Cosel and A. Richter, Comment on “Accelerated Emission of Gamma Rays from the 31-yr Isomer of 178Hf Induced by X-Ray Irradiation”, Phys. Rev. Lett. 84, 2543 (2000)

Comment: D. P. McNabb, J. D. Anderson, J. A. Becker, and M. S. Weiss, Comment on “Accelerated Emission of Gamma Rays from the 31-yr Isomer of 178Hf Induced by X-Ray Irradiation”, Phys. Rev. Lett. 84, 2542 (2000)

Comment: Silviu Olariu and Agata Olariu, Comment on “Accelerated Emission of Gamma Rays from the 31-yr Isomer of 178Hf Induced by X-Ray Irradiation”, Phys. Rev. Lett. 84, 2541 (2000)

Reply: C. B. Collins, F. Davanloo, M. C. Iosif, R. Dussart, J. M. Hicks, S. A. Karamian, C. A. Ur, I. I. Popescu, V. I. Kirischuk, H. E. Roberts, P. McDaniel, and C. E. Crist, Collins et al. Reply:, Phys. Rev. Lett. 84, 2544 (2000)

Physics News Update: Physics News Update, Number 411, Story #2 (1999).

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