Hope College Department of Physics and Engineering
Research Experiences for Undergraduates
Summer 2006
Project Summary

 

Project Title:

Analysis of Kinematics and Decay Energy in the Breakup of 7He

Student Name: Deborah H. Denby
Student's Home Institution: Hope College
Research Advisor: Dr. Paul DeYoung and Dr. Graham Peaslee
Source of Support: National Science Foundation under Grant Numbers 0452206

Data were collected on the breakup of the unstable 7He nucleus into 6He and a neutron, and the decay energy of 7He was calculated. The experiment was designed to verify the experimental setup and methods as well as detector resolution by confirming the currently-accepted 7 He decay energy of 435 keV. 1 A 8Li beam impinged upon a beryllium target, producing short-lived 7He nuclei. The decay products were detected and the decay energy of each 7He was determined to be approximately 370 keV. While this does not match the accepted value of 435 keV 1 , a recent publication has tentatively suggested a possible lower value of 360 keV. 2 Further analysis is in progress to verify this result and to determine uncertainty.

*This material is based upon work supported by the National Science Foundation under NSF-REU Grant No. 0452206

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Publications and Presentations:
"First observation of excited states in 12Li", C.C. Hall*, E.M. Lunderberg*, P.A. DeYoung, T. Baumann, D. Bazin, G. Blanchon, A. Bonaccorso, B.A. Brown, J. Brown, G. Christian, D.H. Denby*, J. Finck, N. Frank, A. Gade, J. Hinnefeld, C.R. Hoffman, B. Luther, S. Mosby, W.A. Peters, A. Spyrou, and M. Thoennessen. Phys. Rev. C 81, 021301(R) (2010).
"Evidence for a Doubly Magic 24O",  C.R. Hoffman, T. Baumann, D. Bazin, J. Brown, G. Christian, D.H. Denby*, P.A. DeYoung, J.E. Finck, N. Frank, J. Hinnefeld, S. Mosby*, W.A. Peters, W.F. Rogers, A. Schiller, A. Spyrou, M.J. Scott, S.L. Tabor, M. Thoennessen, and P.J. Voss*. Phys. Lett. B672, 17 (2009).
"Efficiency of the Modular Neutron Array (MoNA).”W.A. Peters, T. Baumann, G.A. Christian, D.Denby*, P.A. DeYoung, J.E. Finck, C.C. Hall*, J. Hinnefeld, A. Schiller, M.J. Strongman, and M. Thoennessen. Proceedings of the 20th International Conference of the Application of Accelerators in Research and Industry CAARI 2008, AIP Conference Proceedings 1099, 807 (2009).
"Ground Stake Energy and Width of the 7He from 8Li Proton Knockout", D.L. Denby*, P.A. DeYoung, T. Baumann, D. Bazin, E. Breitback*, J. Brown, N. Frank, A. Gade, C.C. Hall*, J. Hinnefeld, C.R. Hoffman, R. Howes, R.A. Jenson*, B. Luther, S.M. Mosby, C.W. Olson*, W.A. Peters, A. Schiller, A. Spyrou, and M. Thoennessen. Phys. Rev. C 78, 044303 (2008).

"Production of Nuclei in Neutron Unbound States via Primary Fragmentation of 48Ca", G. Christian, W.A. Peters, D. Absalon*, D. Albertson*, T. Baumann, D. Bazin, E. BreitbachI, J. Brown, P.L. Cole*, D. Denby*, P.A. DeYoung, J.E. Finck, H. Frank, A. Fritsch*, C. Hall*, A.M. Hayes, J. Hinnefeld, C.R. Hoffman, R. Howes, B. Luther, E. Mosby*, S. Mosby*, D. Padilla*, P.V. Pancella, G. Peaslee, W.F. Rogers, A. Schiller, M.J. Strongman, M. Thoennessen, and L.O. Wagner*. Nucl. Phys. A801, 101, (2008)
" BaF Array for
γ-tagged Studies with Radioactive Nuclear Beams", H. Amro, F.D. Becchetti, Hao Jing, M. Ojaruega, J.J. Kolata, B. Skorodumov, G. Peaslee, P. DeYoung, D. Denby*, and J.D. Hinnefeld. Nucl. Instr. and Meth. A579, 31, (2007).
"7Be-Induced alpha-Transfer Reaction on 12C", H. Amro, F.D. Becchetti, Yu Chen, Hao Jiang, M. Ojaruega, M.J. Golobish, H.C. Griffin, J.J. Kolata, B. Skorodumov, G. Peaslee, P.A. DeYoung, P. Mears, D. Denby*, J. Brown, J.D. Hinnefeld, and A.M. Moro. Euro. Phys. Jour. 150, 1, (2007).
"Analysis of Kinematics and Decay Energy in the Breakup of 7He". Deborah Denby*, Paul A. DeYoung, Graham F. Peaslee, and the MoNA Collaboration. Bull. Am. Phys. Soc. 51, 52 (2006). CEU session at the Division of Nuclear Physics of the APS meeting, Poster 3A.00022, Nashville, TN, October 2006.

G. Audi et al., Nucl. Phys. A729 , 337 (2003)

F. Skaza et al., Phys. Rev. C73 , 044301 (2000).