$\ensuremath{\gamma}$-ray decay from neutron-bound and unbound states in $^{95}\mathrm{Mo}$ and a novel technique for spin determination

$γ$ -ray decay from neutron-bound and unbound states in ${}^{95}{Mo}$ and a novel technique for spin determination

M. Wiedeking, M. Krtička, L. A. Bernstein, J. M. Allmond, M. S. Basunia, D. L. Bleuel, J. T. Harke, B. H. Daub, P. Fallon, R. B. Firestone, B. L. Goldblum, R. Hatarik, P. T. Lake, A. C. Larsen, I.-Y. Lee, S. R. Lesher, S. Paschalis, M. Petri, L. Phair, N. D. Scielzo, and A. Volya

Phys. Rev. C 93, 024303 – Published 1 February 2016

Abstract

The emission of $γ$ rays from neutron-bound and neutron-unbound states in ${}^{95}{Mo}$ , populated in the ${}^{94}{Mo} (d, p)$ reaction, has been investigated. Charged particles and $γ$ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing $p - γ$ and $p - γ - γ$ coincidences, the ${}^{95}{Mo}$ level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below $\approx 2$ MeV. From $p - γ$ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the $(d, p)$ reaction above the neutron separation energy. Spins for almost all ${}^{95}{Mo}$ levels below 2 MeV (and for a few levels above) have been determined with this method.

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Received 21 October 2015
Revised 14 December 2015

DOI:https://doi.org/10.1103/PhysRevC.93.024303

Physics Subject Headings (PhySH)

Energy levels Nuclear spin & parity Transfer reactions

90 ≤ A ≤ 149

Spectrometers & spectroscopic techniques

Nuclear Physics

Authors & Affiliations

M. Wiedeking^1,*, M. Krtička², L. A. Bernstein^3,4, J. M. Allmond^5,6, M. S. Basunia⁷, D. L. Bleuel³, J. T. Harke³, B. H. Daub^4,8, P. Fallon⁷, R. B. Firestone^4,7, B. L. Goldblum⁴, R. Hatarik³, P. T. Lake⁷, A. C. Larsen⁹, I.-Y. Lee⁷, S. R. Lesher^3,10, S. Paschalis⁷, M. Petri⁷, L. Phair⁷, N. D. Scielzo³, and A. Volya¹¹

¹Department of Nuclear Physics, iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa
²Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic
³Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
⁴Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
⁵Department of Physics, University of Richmond, Richmond, Virginia 23173, USA
⁶Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁷Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁸Weapons and Complex Integration Directorate, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
⁹Department of Physics, University of Oslo, 0316 Oslo, Norway
¹⁰Department of Physics, University of Wisconsin-La Crosse, La Crosse, Wisconsin 54601, USA
¹¹Department of Physics, Florida State University, Tallahassee, Florida 32306, USA

^*wiedeking@tlabs.ac.za

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Vol. 93, Iss. 2 — February 2016

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Physical Review C

covering nuclear physics

$γ$ -ray decay from neutron-bound and unbound states in ${}^{95}{Mo}$ and a novel technique for spin determination

M. Wiedeking, M. Krtička, L. A. Bernstein, J. M. Allmond, M. S. Basunia, D. L. Bleuel, J. T. Harke, B. H. Daub, P. Fallon, R. B. Firestone, B. L. Goldblum, R. Hatarik, P. T. Lake, A. C. Larsen, I.-Y. Lee, S. R. Lesher, S. Paschalis, M. Petri, L. Phair, N. D. Scielzo, and A. Volya

Phys. Rev. C 93, 024303 – Published 1 February 2016

Abstract

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Physical Review C

covering nuclear physics

γ-ray decay from neutron-bound and unbound states in Mo95 and a novel technique for spin determination

M. Wiedeking, M. Krtička, L. A. Bernstein, J. M. Allmond, M. S. Basunia, D. L. Bleuel, J. T. Harke, B. H. Daub, P. Fallon, R. B. Firestone, B. L. Goldblum, R. Hatarik, P. T. Lake, A. C. Larsen, I.-Y. Lee, S. R. Lesher, S. Paschalis, M. Petri, L. Phair, N. D. Scielzo, and A. Volya

Phys. Rev. C 93, 024303 – Published 1 February 2016

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$γ$ -ray decay from neutron-bound and unbound states in ${}^{95}{Mo}$ and a novel technique for spin determination