N

Preferably, to ensure minimal nuclear dephasing and loss of coherence the 180.degree. refocusing pulse P' or gradient echo should be applied as shortly after RF pulse P is terminated as practicable.

Upon termination of RF pulse P and the 180.degree. refocusing pulse P' or gradient echo the nuclear vector N will spontaneously relax back into alignment with the Z axis or external magnetic field vector B.sub.o. This is termed T1 relaxation. As part of T1 relaxation the radioactive nuclei will undergo accelerated spontaneous coordinated nuclear decay with emission of a laser type beam 12 of electromagnetic radiation and/or subatomic particles in accordance with the nuclear decay scheme of the nuclear material placed in the nuclear decay laser.

FIG. 9 depicts an alternative method of producing a release of energy and/or particles E wherein radioactive material 16 consists of fissionable nuclei N.sup.f that is flipped into the X-Y plane and is subjected to a 180.degree. refocusing pulse P' or gradient echo so that the fissionable nuclei N.sup.f reaches a critical mass resulting in the release of energy and/or particles. In the preferred embodiment, RF pulse P would be terminated shortly before the application of the 180.degree. refocusing RF pulse P' or gradient echo, however, there may be instances where it is desirable to subject the fissionable nuclei N.sup.f to the RF pulse P and the 180.degree. refocusing RF pulse P' concurrently to achieve a prolonged state of critical mass resulting in energy and/or particle release. As defined herein, critical mass is the state of fissionable nuclei N.sup.f experienced when a coordinated, accelerated fission reaction is achieved after the 180.degree. refocusing RF pulse P' or gradient echo brings the fissionable nuclei N into a coherent phase in the X-Y plane.

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