Geoscience Research Institute

Benjamin L. Clausen

MS Geology, PhD Physics

research interests

Nuclear physics, Igneous Petrology

Education

Ph.D., Nuclear Physics, 1987
University of Colorado, Boulder, Colorado
Thesis: Pion Scattering to 8- Stretched States in 60Ni [Los Alamos Scientific Laboratory thesis LA-11213-T (March 1988)]

B.A., Physics/Math, 1978
Union College, Lincoln, Nebraska

Publications

Experimental papers on stretched states

Pion scattering to 6- stretched states in 32S — B.L.Clausen, T.W.Johnson, R.A.Lindgren, K.Cromer, R.J.Peterson, A.D.Bacher, H.Ward, and A.L.Williams. Phys. Rev. C, v.55, p.625-639 (1997).

Inelastic electron scattering from 18O at backward angles — R.M.Sellers, D.M.Manley, M.M.Niboh, D.S.Weerasundara, R.A.Lindgren, B.L.Clausen, M.Farkhondeh, B.E.Norum, and B.L.Berman. Phys. Rev. C, v.51, p.1926-1944 (1995).

Identification of 4- states in the 14C(p,n)14N reaction at 135 MeV — L.A.C.Garcia, B.D.Anderson, D.M.Manley, A.R.Baldwin, R.Pourang, E.Steinfelds, J.W.Watson, R.A.Lindgren, B.L.Clausen, A.D.Bacher, and C.C.Foster. Phys. Rev. C, v.50, p.289-299 (1994).

High resolution 162 MeV pion scattering to 6- stretched states in 26Mg — B.L.Clausen, R.J.Peterson, C.Kormanyos, J.E.Wise, A.B.Kurepin, and Y.K.Gavrilov. Phys. Rev. C, v.48, p.1632-1642 (1993).

Pion scattering to 6- stretched states in 24Mg and 26Mg — R.A.Lindgren, B.L.Clausen, G.S.Blanpied, J.Hernandez, C.S.Mishra, W.K.Mize, C.S.Whisnant, B.G.Ritchie, C.L.Morris, S.J.Seestrom-Morris, C.Fred Moore, P.A.Seidl, B.H.Wildenthal, R.Gilman, J.A.Carr. Phys. Rev. C, v.44, p.2413-2418 (1991).

Electroexcitation of 6- states in 32S — B.L.Clausen, R.A.Lindgren, M.Farkhondeh, L.W.Fagg, D.I.Sober, C.W.deJager, H.deVries, N.Kalantar-Nayestanaki, B.L.Berman, K.S.Dhuga, J.A.Carr, F.Petrovich, and P.E.Burt. Phys. Rev. Lett., v.65, p.547-550 (1990).

Analysis of pion scattering to stretched states in 60Ni and other nuclei using Woods-Saxon wave functions — B.L.Clausen, J.T.Brack, M.R.Braunstein, J.J.Kraushaar, R.A.Loveman, R.J.Peterson, R.A.Ristinen, R.A.Lindgren, and M.A.Plum. Phys. Rev. C, v.41, p.2246-2256 (1990).

Proton stripping to 8- stretched states in 52Cr — R.J.Peterson, B.L.Clausen, and J.J.Kraushaar. Phys. Rev. C, v.40, p.553-558 (1989).

Proton stripping to 8- stretched states in 60Ni — R.J.Peterson, B.L.Clausen, J.J.Kraushaar, R.A.Lindgren, M.A.Plum, W.W.Jacobs, and H.Nann. Phys. Rev. C, v.35, p.495-502 (1987).

Proton stripping to 6- stretched states of 26Al — R.J.Peterson, B.L.Clausen, J.J.Kraushaar, H.Nann, W.W.Jacobs, R.A.Lindgren, and M.A.Plum. Phys. Rev. C, v.33, p.31-39 (1986).

Theoretical papers on stretched states

Electron scattering form factors of stretched transitions using Woods-Saxon wave functions — B.L.Clausen, R.J.Peterson, and R.A.Lindgren. Phys. Rev. C, v.38, p.589-600 (1988).

Isovector excitation of 1-ħω stretched states in nuclei: effects of meson exchange currents, unbound wave functions, and knockout exchange amplitudes on the extraction of particle-hole strengths — R.A.Lindgren, M.Leuschner, B.L.Clausen, R.J.Peterson, M.A.Plum, and F.Petrovich. Can. J. Phys., v.65, p.666-676 (1987).

Effects of Mesonic Exchange Currents, Unbound Wave Functions, and Knockout Exchange Amplitudes on the Extraction of Particle-Hole Strengths for 1-ħω Stretched States — R.A.Lindgren, M.Leuschner,B.L.Clausen, R.J.Peterson, M.A.Plum, and F.Petrovich, in Nuclear Structure at High Spin, Excitation, and Momentum Transfer (Indiana University), AIP Conf. Proc. No. 142, edited by H. Nann (AIP, New York, 1986), p.133-154.

Miscellaneous papers on nuclear physics

Limitations of the distorted-wave impulse approximation in describing the energy dependence of the 10B(n,p)10Be (g.s.) reaction — D.S.Sorenson, J.L.Ullmann, A.Ling, B.K.Park, R.C.Haight, N.S.P.King, R.A.Lindgren, H.Baghaei, E.J.Stephenson, F.P.Brady, J.L.Romero, J.Rapaport, B.L.Clausen, C.Wuest, and F.Sammarruca. Phys. Rev. C, v.75, 034611, 11p (2007).

Reaction mechanism for natural parity (p,p') transitions in 10B — A.C.Betker, S.Chang, E.J.Stephenson, A.D.Bacher, S.M.Bowyer, W.A.Franklin, J.Liu, C.Olmer, D.L.Prout, S.P.Wells, S.W.Wissink, C.Yu, R.A.Lindgren, H.Baghaei, V.Gladyshev, J.A.Carr, S.K.Yoon, F.Petrovich, B.L.Clausen, and J.Lisantti. Phys. Rev. C, v.71, 064607, 12p (2005).

Pion-nucleus spin-flip strength at low and resonance energies — B.G.Ofenloch, R.A.Giannelli, B.G.Ritchie, J.M.O’Donnell, J.N.Knudson, C.L.Morris, C.M.Kormanyos, A.Saunders, J.Z.Williams, R.A.Lindgren, and B.L.Clausen. Phys. Rev. C, v.55, p.1295-1303 (1997).

Quasielastic K+ scattering — C.M.Kormanyos, R.J.Peterson, J.R.Shepard, J.E.Wise, S.Bart, R.E.Chrien, L.Lee, B.L.Clausen, J.Piekarewicz, M.B.Barakat, E.V.Hungerford, R.A.Michael, K.H.Hicks, and T.Kishimoto. Phys. Rev. C, v.51, p.669-679 (1995).

K+-Nucleus Quasielastic Scattering — C.M.Kormanyos, R.J.Peterson, J.R.Shepard, J.E.Wise, S.Bart, R.E.Chrien, L.Lee, B.L.Clausen, J.Piekarewicz, M.B.Barakat, R.A.Michael, and T.Kishimoto. Phys. Rev. Lett., v.71, p.2571-2574 (1993).

Absolute differential cross sections and charge asymmetries for π±d elastic scattering at 65 MeV — M.D.Kohler, J.T.Brack, B.Clausen, J.J.Kraushaar, B.J.Kriss, R.A.Ristinen, K.Vaziri, G.R.Smith, D.F.Ottewell, M.E.Sevior, R.P.Trelle, and N.R.Stevenson. Phys. Rev. C, v.44, p.15-23 (1991).

Spin Transverse-Longitudinal Composition of the Isovector Effective NN Interaction from 10B(p,p') at 200 MeV — H.Baghaei, R.A.Lindgren, P.Slocum, E.J.Stephenson, A.D.Bacher, S.Chang, J.Lisantti, J.Liu, C.Olmer, S.Wells, S.W.Wissink, B.L.Clausen, J.A.Carr, S.K.Yoon, and F.Petrovich. Phys. Rev. Lett., v.69, p.2054-2057 (1992).

Pion charge exchange to the isvoector giant dipole state at energies above the 3-3 resonance — R.A.Loveman, B.L.Clausen, R.J.Peterson, S.H.Rokni, H.W.Baer, A.G.Bergman, J.D.Bowman, F.Irom, C.J.Seftor, J.Alster, E.Piasetzky, J.N.Knudson, and U.Sennhauser. Phys. Rev. C, v.40, p.2710-2716 (1989).

Isobaric-Analog-State Transitions in Pion Charge-Exchange Reactions above the Δ(1232) Resonance — S.H.Rokni, H.W.Baer, A.G.Bergmann, J.D.Bowman, F.Irom, M.J.Leitch, C.J.Seftor, J.Alster, E.Piasetzky,B.L.Clausen, R.A.Loveman, R.J.Peterson, J.L.Ullmann, J.R.Comfort, J.N.Knudson, U.Sennhauser. Phys. Lett., v.202B, p.35-39 (1988).
see also: AIP Conference Proceedings, v.163, n.1, p.67-78 (December 1, 1987).

Pion scattering to collective excitations in 90Zr and 118Sn — J.L.Ullmann, P.W.F.Alons, B.L.Clausen, J.J.Kraushaar, J.H.Mitchell, R.J.Peterson, R.A.Ristinen, R.L.Boudrie, N.S.P.King, C.L.Morris, J.N.Knudson, E.F.Gibson. Phys. Rev. C, v.35, p.1099-1113 (1987).

Delta production by pion charge exchange on complex nuclei — B.L.Clausen, R.A.Loveman, R.J.Peterson, R.A.Ristinen, J.L.Ullmann, and F.Irom. Phys. Rev. C, v.35, p.1028-1036 (1987).

Abstracts

Distorted Wave Analyses of 10B(π++') at 65 MeV — B.G.Ofenloch, R.A.Giannelli, B.G.Ritchie, J.M.O'Donnell, C.L.Morris, J.N.Knudson, C.M.Kormanyos, A.Saunders, J.Z.Williams, R.A.Lindgren, and B.L.Clausen. Bull. Am. Phys. Soc., v.39, p.1145 (1994).

Scattering of Polarized Protons from 10B at 200 MeV — H.Baghaei, R.A.Lindgren, E.J.Stephenson, A.D.Bacher, J.Lisantti, J.Liu, C.Olmer, S.P.Wells, S.W.Wissink, B.L.Claussen, J.A.Carr, F.Al-Halmoushi, and F.Petrovich. Bull. Am. Phys. Soc., v.38, p.1846 (1993).

The Energy Dependence of the Effective N-N Isovector Tensor Interaction Using the Stretched Transition from the 3+ Ground State of 10B to the 0+ Ground State of 10Be Over the Energy Range of 50 to 250 MeV — D.S.Sorenson, F.P.Brady, B.Clausen, R.C.Haight, R.A.Lindgren, A.Ling, B.K.Park, J.Rapaport, J.L.Romero, J.L.Ullmann, and C.Wuest. Bull. Am. Phys. Soc., v.38, p.1826 (1993).

Electroexcitation of 4+ States in 18O — D.M.Manley, R.M.Sellers, M.M.Niboh, R.A.Lindgren, B.L.Clausen, M.Farkhondeh, B.E.Norum, B.L.Berman. Bull. Am. Phys. Soc., v.38, p.1820 (1993).

Inelastic Pion Scattering on 10B at 65 MeV — B.G.Ofenloch, R.A.Giannelli, B.G.Ritchie, J.M.O'Donnell, C.L.Morris, J.N.Knudson, C.Kormanyos, A.Saunders, J.Z.Williams, R.A.Lindgren, and B.L.Clausen. Bull. Am. Phys. Soc., v.38, p.1817 (1993).

Nuclear Response to Quasifree K+ Scattering — C.M.Kormanyos, R.J.Peterson, J.R.Shepard, J.E.Wise, M.D.Holcomb, S.Bart, R.E.Chrien, L.Lee, B.L.Claussen, J.Piekarewicz, K.Hicks, R.Michael, M.Barakat, E.V.Hungerford, and T.Kishimoto. Bull. Am. Phys. Soc., v.38, p.944 (1993).

A Test of the Effective N-N Isovector Tensor Interaction from Bombarding Energies of 65 to 250 MeV using the Stretched State in the 10B(n,p)10Be gs Reaction — D.S.Sorenson, F.P.Brady, B.Clausen, R.C.Haight, R.Lindgren, A.Ling, J.Rapaport, J.L.Romero, J.L.Ullmann, and C.Wuest. Bull. Am. Phys. Soc., v.37, p.1299 (1992).

Transverse-Longitudinal Composition of the Isovector Spin Dependent NN Interaction from DNN' — R.A.Lindgren, H.Baghaei, P.Slocum, E.J.Stephenson, A.D.Bacher, S.Chang, J.Lisantti, J.Liu, C.Olmer, S.Wells, S.W.Wissink, B.L.Clausen, J.A.Carr, S.K.Yoon, and F.Petrovich. Bull. Am. Phys. Soc., v.37, p.1257 (1992).

Pion Scattering to 6- Stretched States in 26Mg — B.L.Clausen, R.J.Peterson, C.Kormanyos, M.Holcomb, R.Ristinen, J.Wise, A.Kurepin, Y.Gavrilov, R.A.Lindgren, K.Cromer, S.J.Greene, H.Ward, and A.Williams. Bull. Am. Phys. Soc., v.37, p.916 (1992).

Pion Scattering to 6- Stretched States in 32S — B.L.Clausen, R.A.Lindgren, K.Cromer, R.J.Peterson, C.Kormanyos, A.D.Bacher, C.L.Morris, H.Ward, A.Williams, A.Kurepin, Y.Gavrilov, and L.W.Fagg. Bull. Am. Phys. Soc., v.36, p.2132 (1991).

Excitation of 0-hbar-omega and 1-hbar-omega Stretched-States in the 18O(p,n)18F and 30Si(p,n)30P Reactions at 135 MeV — L.A.C.Garcia, B.D.Anderson, A.R.Baldwin, R.Madey, D.M.Manley, R.Pourang, E.Steinfelds, J.W.Watson, C.C.Foster, A.Bacher, R.Lindgren, and B.Clausen. Bull. Am. Phys. Soc., v.36, p.2132 (1991).

Measurements of δ, AP, and DNN' for 10B(p-polarized,p-polarized')10B Scattering at Ep=200 MeV — H.Baghaei, R.A.Lindgren, E.J.Stephenson, A.D.Bacher, S.Chang, J.Lisantti, J.Liu, C.Olmer, S.Wells, S.W.Wissink, and B.L.Clausen. Bull. Am. Phys. Soc., v.36, p.1351 (1991).

Excitation of (d5/2, p3/2-1)4- Stretched-State Strength in the 14C(p,n)14N Reaction at 135 MeV — L.A.C.Garcia, B.D.Anderson, A.R.Baldwin, R.Madey, D.M.Manley, R.Pourang, E.Steinfelds, J.W.Watson, C.C.Foster, A.Bacher, R.Lindgren, B.Clausen. Bull. Am. Phys. Soc., v.35, p.1650 (1990).

Electroexcitation of 4- and 6- States in 18O — R.M.Sellers, D.M.Manley, R.A.Lindgren, B.L.Clausen, M.Farkhondeh, B.E.Norum, R.J.Peterson, B.L.Berman, C.E.Hyde-Wright. Bull. Am. Phys. Soc., v.35, p.927 (1990).

Measurement of π± Deuteron Elastic Scattering Cross Sections and Charge Asymmetries at 50 and 65 MeV — R.A.Ristinen, M.D.Kohler, J.T.Brack, B.Clausen, J.J.Kraushaar, B.Kriss, K.Vaziri, G.R.Smith, D.F.Ottewell, M.Sevior, N.R.Stevenson. EPS Nuclear Physics Study Conference, Crete, Greece, May 20-26, 1990.

Excitation of 4- States in 14C from Inelastic Scattering of 497 MeV Protons — K.Cromer, B.L.Clausen, R.A.Lindgren, B.E.Norum, D.Dehnhard, M.K.Jones, S.K.Nanda, S.J.Seestrom-Morris, K.W.Jones, J.A.McGill, M.A.Plum, C.J.Harvey, P.A.Seidl, J.D.Zumbro, J.R.Comfort, and G.S.Adams. Bull. Am. Phys. Soc., v.34, p.1829 (1989).

Electroexcitation of 6- States in 30Si — L.Knox, R.A.Lindgren, B.L.Clausen, B.Berman, D.Zubanov, M.Farkhondeh, L.W.Fagg, and M.Manley. Bull. Am. Phys. Soc., v.34, p.1812 (1989).

Pion Charge Exchange to Delta-Hole States of Complex Nuclei — M.R.Braunstein, R.J.Peterson, J.T.Brack, M.D.Kohler, J.J.Kraushaar, D.S.Oakley, D.J.Rilett, R.A.Ristinen, J.N.Knudson, and B.L.Clausen. Bull. Am. Phys. Soc., v.34, p.1204 (1989).

Pion-Deuteron Elastic Scattering Cross Sections and Charge Asymmetries at 50 and 65 MeV — K.Vaziri, J.T.Brack, B.Clausen, M.Kohler, J.J.Kraushaar, D.J.Rilett, R.A.Ristinen, D.F.Ottewell, M.Sevior, G.R.Smith, R.P.Trelle, and N.R.Stevenson. Bull. Am. Phys. Soc., v.33, p.1606 (1988).

Electroexcitation of 6- States in 32S — L.W.Fagg, D.Sober, B.Clausen, R.Lindgren, B.Berman, K.Dhuga, C.deJager, H.deVries, N.Kalantar-Nayestanaki, P.Burt. Bull. Am. Phys. Soc., v.33, p.1594 (1988).

A Comparison of Results from an Analysis of Pion and Electron Scattering to Stretched States using Woods-Saxon and Harmonic Oscillator Wave Functions — B.L.Clausen, R.A.Lindgren, J.T.Brack, M.P.Braunstein, J.J.Kraushaar, R.A.Loveman, R.J.Peterson, R.A.Ristinen, and M.A.Plum. Bull. Am. Phys. Soc., v.33, p.1586 (1988).

Pion-Nucleus Single Charge Exchange Reactions Above the (3,3) Resonance — S.H.Rokni, H.W.Baer, J.D.Bowman, F.Irom, M.J.Leitch, J.Alster, E.Piasetzky, J.R.Comfort, J.N.Knudson, B.L.Clausen, R.A.Loveman, R.J.Peterson, J.L.Ullmann, A.G.Bergmann, C.J.Seftor, U.Sennhauser. Bull. Am. Phys. Soc., v.32, p.1119 (1987).

Pion Scattering to 8- Stretched States in 60Ni — B.L.Clausen, J.T.Brack, M.P.Braunstein, J.J.Kraushaar, R.A.Loveman, R.J.Peterson, R.A.Ristinen, M.A.Plum, and R.A.Lindgren. Bull. Am. Phys. Soc., v.32, p.1118 (1987).

Systematics of High Energy Pion Single Charge Exchange Reactions — S.H.Rokni, H.W.Baer, J.D.Bowman, F.Irom, M.J.Leitch, J.Alster, E.Piasetzky, J.R.Comfort, J.N.Knudson, B.L.Clausen, R.A.Loveman, R.J.Peterson, J.L.Ullmann, A.G.Bergmann, C.J.Seftor, U.Sennhauser. Bull. Am. Phys. Soc., v.31, p.856 (1986).

Excitation of 6- Stretched States by the 25Mg(α,t)26Al Reaction — B.L.Clausen, R.J.Peterson, J.J.Kraushaar, H.Nann, and W.W.Jacobs. Bull. Am. Phys. Soc., v.30, p.725 (1985).