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4 results on '"Hausser, O"'

1. Novel search for heavy nu mixing from the beta(+) decay of K-38m confined in an atom trap

Author

UCL, Trinczek, M, Gorelov, A., Melconian, D., Alford, WP, Asgeirsson, D, Ashery, D., Behr, JA, Bricault, PG, D'Auria, JM, Deutsch, Jules, Dilling, J., Dombsky, M., Dube, P., Eaton, S, Fingler, J, Giesen, U, Gu, S, Hausser, O, Jackson, KP, Lee, B., Schmid, JH, Stocki, TJ, Swanson, TB, Wong, W, UCL, Trinczek, M, Gorelov, A., Melconian, D., Alford, WP, Asgeirsson, D, Ashery, D., Behr, JA, Bricault, PG, D'Auria, JM, Deutsch, Jules, Dilling, J., Dombsky, M., Dube, P., Eaton, S, Fingler, J, Giesen, U, Gu, S, Hausser, O, Jackson, KP, Lee, B., Schmid, JH, Stocki, TJ, Swanson, TB, and Wong, W

Abstract

A new technique, full neutrino momentum reconstruction, is used to set limits on the admixture of heavy neutrinos into the electron neutrino. We measure coincidences between nuclear recoils and positrons from the beta decay of trapped radioactive atoms and deduce the neutrino momentum. A search for peaks in the reconstructed recoil time-of-flight spectrum as a function of positron energy is performed. The admixture upper limits range from 4x10(-3) to 2x10(-2) and are the best direct limits for neutrinos (as opposed to antineutrinos) for the mass region of 0.7 to 3.5 MeV.

Published
2003

2. Beta-neutrino correlation experiments on laser trapped K-38m, K-37

Author

UCL - Autre, Gorelov, A., Behr, JA, Melconian, D., Trinczek, M, Dube, P., Hausser, O, Giesen, U, Jackson, KP, Swanson, T, D'Auria, JM, Dombsky, M., Ball, G., Buchmann, L., Jennings, B, Dilling, J., Schmid, J, Ashery, D., Deutsch, Jules, Alford, WP, Asgeirsson, D, Wong, W, Lee, B., 1st Euroconference on Atomic Physics at Accelerators (APAC 99), UCL - Autre, Gorelov, A., Behr, JA, Melconian, D., Trinczek, M, Dube, P., Hausser, O, Giesen, U, Jackson, KP, Swanson, T, D'Auria, JM, Dombsky, M., Ball, G., Buchmann, L., Jennings, B, Dilling, J., Schmid, J, Ashery, D., Deutsch, Jules, Alford, WP, Asgeirsson, D, Wong, W, Lee, B., and 1st Euroconference on Atomic Physics at Accelerators (APAC 99)

Abstract

Laser trapping and cooling techniques are now being applied to the study of nuclear beta-decay at several labs. A magneto-optical trap (MOT) provides a localized source of atoms suspended in space, so the low-energy recoiling nuclei can freely escape and be detected in coincidence with the beta. This allows reconstruction of the neutrino momentum, and the deduction of the beta-nu correlation in a more direct fashion than previously possible. In addition, the nuclei can be polarized by atomic techniques, opening a new class of spin-correlation measurements to test the degree to which parity is maximally violated in the weak interaction. Our present experiment has detected several hundred thousand recoil-beta(+) coincidences from the 0(+) --> 0(+) pure Fermi decay of K-38m, produced at the on-line isotope separators TISOL and ISAC at TRIUMF. Our goal is to set constraints on non-Standard Model scalar bosons competitive with high-energy colliders and more conventional beta-nu correlation experiments.

Published
2000

3. COEXISTENCE OF SPHERICAL AND OBLATE CONFIGURATIONS IN GD-147

Author

BAKANDER, O, BAKTASH, C, BORGGREEN, J, JENSEN, JB, KOWNACKI, K, PEDERSEN, J, SLETTEN, G, WARD, D, ANDREWS, HR, HAUSSER, O, SKENSVED, P, TARAS, P, BAKANDER, O, BAKTASH, C, BORGGREEN, J, JENSEN, JB, KOWNACKI, K, PEDERSEN, J, SLETTEN, G, WARD, D, ANDREWS, HR, HAUSSER, O, SKENSVED, P, and TARAS, P

Published
1982

4. COEXISTENCE OF SPHERICAL AND OBLATE CONFIGURATIONS IN GD-147

Author

BAKANDER, O, BAKTASH, C, BORGGREEN, J, JENSEN, JB, KOWNACKI, K, PEDERSEN, J, SLETTEN, G, WARD, D, ANDREWS, HR, HAUSSER, O, SKENSVED, P, TARAS, P, BAKANDER, O, BAKTASH, C, BORGGREEN, J, JENSEN, JB, KOWNACKI, K, PEDERSEN, J, SLETTEN, G, WARD, D, ANDREWS, HR, HAUSSER, O, SKENSVED, P, and TARAS, P

Published
1982

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