DJ Morrissey, Decay Studies

Decay of Exotic Nuclei, D.J.Morrissey

Projectile fragmenation reactions create nuclei that are so exotic that they rapidly undergo beta-decay with the release of large amounts of energy. Often the decay leads to the emission of neutrons or protons. We have developed a system to detect beta-delayed neutrons and measure their time-of-flight over a one meter flight path. This provides a spectroscopic measuremnet of the emitted neutron and allows us to follow the decay of the exotic nuclei in some detail. We have studied a variety of low-Z neutron-rich nuclei with this technique. We have also collaborated with P.F. Mantica's group at the NSCL to study other beta-decaying unusual nuclei.

Recent NSCL Poster by C. Sumithrarachchi :

References

Beta-decay branching ratios of the neutron-rich nucleus, ¹⁵B, R. Harkewicz, D.J. Morrissey, B.A. Brown, J.A. Nolen, Jr., N.A. Orr, B.M. Sherrill, J.S. Winfield, and J.A. Winger, Phys. Rev. C 44, 2365, (1991).
Beta-delayed proton decay of ²⁰Mg and its Astrophysical Implications, J. Goerres, M. Weischer, K. Scheller, D.J. Morrissey, B.M. Sherrill, D. Bazin, and J.A. Winger, Phys. Rev. C 46, R833 (1992).
Halflife Measurements of the rp-process Nuclei ⁶¹Ga, ⁶³Ge, and ⁶⁵As, J.A. Winger, D.P. Bazin, W. Benenson, G.M. Crawley, D.J. Morrissey, N.A. Orr, R. Pfaff, B.M. Sherrill, M. Steiner, M. Thoennessen, S.J. Yennello, and B.M. Young, Phys. Lett. B299, 214 (1993), and Phys. Rev. C 48, 3097 (1993).
Study of the beta-delayed neutron decay of ¹⁸N, K.W. Scheller, J. Goerres, J.G. Ross, M. Weischer, D.J. Morrissey, B.M. Sherrill, M. Steiner, N.A. Orr, and J.A. Winger, Phys. Rev., C 49, 46, (1994).
Study of the beta-delayed neutron decay of ¹⁷C and ¹⁸C, K.W. Scheller, J. Goerres, S. Vouzoukas, M. Weischer, B. Pfeiffer, K.-L. Kratz, D.J. Morrissey, B.M. Sherrill, M. Steiner, M. Hellstroem, and J.A. Winger, Nucl. Phys. A582 (1995) 109.
The beta-delayed neutron decay of ¹⁴Be, M.D. Belbot, J.J. Kolata, K. Lamkin, R.J. Tighe, M. Zahar, R. Harkewicz, D.J. Morrissey, N.A. Orr, R. Ronningen, B.M. Sherrill, J.A. Winger, and M. Carpenter, Phys. Rev. C 51, 2372 (1995).
Beta-delayed proton emission around N=50 and the rp-process, M. Hellstroem, Z. Hu, A. Weber, M. Hencheck, M.J. Balbes, R.N. Boyd, D. Cano-Ott, R. Collatz, A. Guglielmetti, Z. Janas, M. Karny, R. Kirchner, J. Morford, D.J. Morrissey, G. Raimann, E. Roeckl, K. Schmidt, and J. Szerypo, Z. Phys. A 356, 229 (1996).
Single Neutron Emission Following ¹¹Li beta-decay, D.J. Morrissey, K.N. McDonald, D. Bazin, B.A. Brown, R. Harkewicz, N.A. Orr, B.M. Sherrill, G.A. Souliotis, M. Steiner, J.A. Winger, S.J. Yennello, B.M. Young, S. Lukyanov, G. Chubarian, and Yu.Ts. Oganessian, Nucl. Phys. A 627, 222 (1997).
Anomalous Ground State Magnetic Dipole Moment of ⁹C, M. Huhta, P.F. Mantica, D.W. Anthony, B.A. Brown, B. Davids, R.W. Ibbotson, D.J. Morrissey, C.F. Powell, and M. Steiner, Phys. Rev. C 57, R2790 (1998).
Structure of ^52,54Ti and shell closures in neutron-rich nuclei about ⁴⁸Ca, R.V.F. Janssens, B. Fornal, P.F. Mantica, B.A. Brown, P. Bhattacharyya, R. Broda, M.P. Carpenter, M. Cinausero, P.J. Daly, A.D. Davies, T. Glasmacher, Z.W. Grabowski, D. E. Groh, M. Homma, F.G. Kondev, W. Krolas, T. Lauritsen, S.N. Liddick, S. Lunardi, N. Marginean,
T. Mizusaki, D.J. Morrissey, A.C. Morton, W.F. Mueller, T. Otsuka, T. Pawlat, D. Seweryniak, H. Schatz, A. Stolz, S.L. Tabor, C.A. Ur, G. Viesti, I. Wiedenhoever, and J. Wrzesinski, Phys. Lett. B546 (2002) 55.
Beta Decay Studies of the Neutron-Rich ^56-58V Isotopes; P.F. Mantica, A.C. Morton, B.A. Brown, A.D. Davies, T. Glasmacher, D.E. Groh, S.N. Liddick, D.J. Morrissey, W.F. Mueller, H. Schatz, A. Stolz, S.L. Tabor, M. Honma, M. Horoi, and T. Otsuka, Phys. Rev. C67 (2003) 014311.
Development of Shell Closures at N = 32, 34. I. Beta Decay of Neutron-Rich Sc Isotopes; S.N. Liddick, P.F. Mantica, R. Broda, B.A. Brown, M.P. Carpenter, A.D. Davies, B. Fornal, T. Glasmacher, D.E. Groh, M. Honma, M. Horoi, R.V.F. Janssens, T. Mizusaki, D.J. Morrissey, A.C. Morton, W.F. Mueller, T. Otsuka, J. Pavan, H. Schatz, A. Stolz, S.L. Tabor, B.E. Tomlin, and M. Wiedeking, Phys. Rev. C70 (2oo4) 064303.
Beta-delayed Neutron Decay of ¹⁹N and ²⁰N, C.S. Sumithrarachchi, D.W. Anthony, P.A. Lofy, and D.J. Morrissey, Phys. Rev. C submitted for publication (2oo6).

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djm - last update: 23-May-2006

Decay of Exotic Nuclei, D.J.Morrissey

Recent NSCL Poster by C. Sumithrarachchi :

References

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