Two-neutron knockout as a probe of the composition of states in , and
Abstract
Simpson and Tostevin proposed that the width and shape of exclusive parallel momentum distributions of the residue in direct two-nucleon knockout reactions carry a measurable sensitivity to the nucleon single-particle configurations and their couplings within the wave functions of exotic nuclei. We further report here on the first benchmarks and use of this new spectroscopic tool. Exclusive parallel momentum distributions for states in the neutron-deficient nuclei , and populated in such direct two-neutron removal reactions were extracted and compared to predictions combining eikonal reaction theory and shell-model calculations. For the well-known and nuclei, measurements and calculations were found to agree, supporting the dependence of the parallel momentum distribution width on the angular momentum composition of the shell-model two-neutron amplitudes. In , a level at 3439(9) keV, of relevance for the important astrophysical reaction rate, was confirmed to be the state, whereas the state, expected to be strongly populated in two-neutron knockout, was not observed. This puzzle is resolved by theoretical considerations of the Thomas-Ehrman shift, which also indicates that a previously reported 3471-keV state in is, in fact, the ( ) level with one of the largest experimental mirror-energy shifts ever observed.
- Authors:
-
- Michigan State Univ., East Lansing, MI (United States)
- Univ. of Surrey, Guildford (United Kingdom)
- Australian National Univ., Canberra, ACT (Australia)
- Michigan State Univ., East Lansing, MI (United States); Univ. of Massachusetts, Lowell, MA (United States)
- Michigan State Univ., East Lansing, MI (United States); Univ. of the West of Scotland (United Kingdom)
- Michigan State Univ., East Lansing, MI (United States); Florida State Univ., Tallahassee, FL (United States)
- Michigan State Univ., East Lansing, MI (United States); Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
- Publication Date:
- Research Org.:
- Michigan State Univ., East Lansing, MI (United States); Univ. of California, Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Science and Technology Facilities Council; USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- OSTI Identifier:
- 1604421
- Alternate Identifier(s):
- OSTI ID: 1604487; OSTI ID: 1604763
- Grant/Contract Number:
- SC0020451; PHY-1102511; PHY-1565546; NA0003180; FG02-08ER41556; ST/L005743/1; PHY-1811855
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 3; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; gamma-ray spectroscopy; nuclear structure; shell model; direct reactions; radioactive beams; gamma-ray spectroscopy, nuclear structure, shell model, direct reactions, radioactive beams
Citation Formats
Longfellow, B., Gade, Alexandra, Tostevin, J. A., Simpson, E. C., Brown, B. A., Magilligan, A., Bazin, D., Bender, P. C., Bowry, M., Elman, B., Lunderberg, E., Rhodes, D., Spieker, M., Weisshaar, D., and Williams, S. J. Two-neutron knockout as a probe of the composition of states in Mg22,Al23 , and Si24. United States: N. p., 2020.
Web. doi:10.1103/PhysRevC.101.031303.
Longfellow, B., Gade, Alexandra, Tostevin, J. A., Simpson, E. C., Brown, B. A., Magilligan, A., Bazin, D., Bender, P. C., Bowry, M., Elman, B., Lunderberg, E., Rhodes, D., Spieker, M., Weisshaar, D., & Williams, S. J. Two-neutron knockout as a probe of the composition of states in Mg22,Al23 , and Si24. United States. https://doi.org/10.1103/PhysRevC.101.031303
Longfellow, B., Gade, Alexandra, Tostevin, J. A., Simpson, E. C., Brown, B. A., Magilligan, A., Bazin, D., Bender, P. C., Bowry, M., Elman, B., Lunderberg, E., Rhodes, D., Spieker, M., Weisshaar, D., and Williams, S. J. Thu .
"Two-neutron knockout as a probe of the composition of states in Mg22,Al23 , and Si24". United States. https://doi.org/10.1103/PhysRevC.101.031303. https://www.osti.gov/servlets/purl/1604421.
@article{osti_1604421,
title = {Two-neutron knockout as a probe of the composition of states in Mg22,Al23 , and Si24},
author = {Longfellow, B. and Gade, Alexandra and Tostevin, J. A. and Simpson, E. C. and Brown, B. A. and Magilligan, A. and Bazin, D. and Bender, P. C. and Bowry, M. and Elman, B. and Lunderberg, E. and Rhodes, D. and Spieker, M. and Weisshaar, D. and Williams, S. J.},
abstractNote = {Simpson and Tostevin proposed that the width and shape of exclusive parallel momentum distributions of the A-2 residue in direct two-nucleon knockout reactions carry a measurable sensitivity to the nucleon single-particle configurations and their couplings within the wave functions of exotic nuclei. We further report here on the first benchmarks and use of this new spectroscopic tool. Exclusive parallel momentum distributions for states in the neutron-deficient nuclei Mg22,Al23, and Si24 populated in such direct two-neutron removal reactions were extracted and compared to predictions combining eikonal reaction theory and shell-model calculations. For the well-known Mg22 and Al23 nuclei, measurements and calculations were found to agree, supporting the dependence of the parallel momentum distribution width on the angular momentum composition of the shell-model two-neutron amplitudes. In Si24, a level at 3439(9) keV, of relevance for the important Al23(p,γ)Si24 astrophysical reaction rate, was confirmed to be the 22+ state, whereas the 41+ state, expected to be strongly populated in two-neutron knockout, was not observed. This puzzle is resolved by theoretical considerations of the Thomas-Ehrman shift, which also indicates that a previously reported 3471-keV state in Si24 is, in fact, the (02+) level with one of the largest experimental mirror-energy shifts ever observed.},
doi = {10.1103/PhysRevC.101.031303},
journal = {Physical Review C},
number = 3,
volume = 101,
place = {United States},
year = {2020},
month = {3}
}
Works referenced in this record:
Focal plane detector for the S800 high-resolution spectrometer
journal, February 1999
- Yurkon, J.; Bazin, D.; Benenson, W.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 422, Issue 1-3
Two-neutron knockout from neutron-deficient , , and
journal, August 2006
- Yoneda, K.; Obertelli, A.; Gade, A.
- Physical Review C, Vol. 74, Issue 2
Nucleus : A Barely Unbound System beyond the Drip Line
journal, March 2016
- Kondo, Y.; Nakamura, T.; Tanaka, R.
- Physical Review Letters, Vol. 116, Issue 10
In-beam γ-ray spectroscopy at the proton dripline: 23Al
journal, August 2008
- Gade, A.; Adrich, P.; Bazin, D.
- Physics Letters B, Vol. 666, Issue 3
Constraining the Neutron Star Compactness: Extraction of the Reaction Rate for the Process
journal, June 2019
- Wolf, C.; Langer, C.; Montes, F.
- Physical Review Letters, Vol. 122, Issue 23
Constraint on the astrophysical reaction rate through a measurement
journal, May 2009
- Chae, K. Y.; Bardayan, D. W.; Blackmon, J. C.
- Physical Review C, Vol. 79, Issue 5
Inverse Kinematic Study of the Reaction and Implications for Destruction of in Wolf-Rayet and Asymptotic Giant Branch Stars
journal, August 2015
- Margerin, V.; Lotay, G.; Woods, P. J.
- Physical Review Letters, Vol. 115, Issue 6
Status of the Nuclear Shell Model
journal, December 1988
- Brown, B. A.; Wildenthal, B. H.
- Annual Review of Nuclear and Particle Science, Vol. 38, Issue 1
Single-particle structure of silicon isotopes approaching
journal, September 2014
- Stroberg, S. R.; Gade, A.; Tostevin, J. A.
- Physical Review C, Vol. 90, Issue 3
Discovery of : A Nuclear Sandbank Beyond the Proton Drip Line
journal, November 2017
- Suzuki, H.; Sinclair, L.; Söderström, P. -A.
- Physical Review Letters, Vol. 119, Issue 19
Commissioning the A1900 projectile fragment separator
journal, May 2003
- Morrissey, D. J.; Sherrill, B. M.; Steiner, M.
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 204
Dependence of X-Ray Burst Models on Nuclear Reaction Rates
journal, October 2016
- Cyburt, R. H.; Amthor, A. M.; Heger, A.
- The Astrophysical Journal, Vol. 830, Issue 2
Spectroscopy and lifetime measurements near the proton drip line:
journal, June 2019
- Longfellow, B.; Gade, A.; Brown, B. A.
- Physical Review C, Vol. 99, Issue 6
New Direct Reaction: Two-Proton Knockout from Neutron-Rich Nuclei
journal, June 2003
- Bazin, D.; Brown, B. A.; Campbell, C. M.
- Physical Review Letters, Vol. 91, Issue 1
Center-of-mass effects in single-nucleon knock-out reactions
journal, August 1974
- Dieperink, A. E. L.; Forest, T. de
- Physical Review C, Vol. 10, Issue 2
Triple configuration coexistence in
journal, June 2011
- Santiago-Gonzalez, D.; Wiedenhöver, I.; Abramkina, V.
- Physical Review C, Vol. 83, Issue 6
The S800 spectrograph
journal, May 2003
- Bazin, D.; Caggiano, J. A.; Sherrill, B. M.
- Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 204
Mass Measurement on the -Process Waiting Point
journal, October 2004
- Rodríguez, D.; Kolhinen, V. S.; Audi, G.
- Physical Review Letters, Vol. 93, Issue 16
D IRECT R EACTIONS WITH E XOTIC N UCLEI
journal, December 2003
- Hansen, P. G.; Tostevin, J. A.
- Annual Review of Nuclear and Particle Science, Vol. 53, Issue 1
Two-Nucleon Knockout Spectroscopy at the Limits of Nuclear Stability
journal, April 2009
- Simpson, E. C.; Tostevin, J. A.; Bazin, D.
- Physical Review Letters, Vol. 102, Issue 13
Empirical strengths of spin operators in nuclei
journal, January 1984
- Wildenthal, B. H.
- Progress in Particle and Nuclear Physics, Vol. 11
Measurement of key resonances for the reaction rate using in-beam -ray spectroscopy
journal, May 2018
- Longfellow, B.; Gade, A.; Brown, B. A.
- Physical Review C, Vol. 97, Issue 5
Longitudinal momentum distributions of the reaction residues following fast two-nucleon knockout reactions
journal, June 2009
- Simpson, E. C.; Tostevin, J. A.; Bazin, D.
- Physical Review C, Vol. 79, Issue 6
In-beam nuclear spectroscopy of bound states with fast exotic ion beams
journal, January 2008
- Gade, A.; Glasmacher, T.
- Progress in Particle and Nuclear Physics, Vol. 60, Issue 1
Nuclear structure from direct reactions with rare isotopes: observables, methods and highlights
journal, September 2016
- Obertelli, Alexandre
- The European Physical Journal Plus, Vol. 131, Issue 9
First Measurement of Excited States in the Very Proton Rich Nucleus Si and the Consequences for Na Nucleosynthesis in Novae
journal, November 1997
- Schatz, H.; Görres, J.; Herndl, H.
- Physical Review Letters, Vol. 79, Issue 20
High-precision reaction measurement to determine reaction rates
journal, November 2009
- Matic, A.; Berg, A. M. van den; Harakeh, M. N.
- Physical Review C, Vol. 80, Issue 5
Probing elastic and inelastic breakup contributions to intermediate-energy two-proton removal reactions
journal, May 2012
- Wimmer, K.; Bazin, D.; Gade, A.
- Physical Review C, Vol. 85, Issue 5
Isobaric-spin splitting of single-particle resonances
journal, July 1961
- French, J. B.; MacFarlane, M. H.
- Nuclear Physics, Vol. 26, Issue 1
The Effects of Variations in Nuclear Processes on Type I X‐Ray Burst Nucleosynthesis
journal, September 2008
- Parikh, Anuj; José, Jordi; Moreno, Fermín
- The Astrophysical Journal Supplement Series, Vol. 178, Issue 1
NSCL and FRIB at Michigan State University: Nuclear science at the limits of stability
journal, April 2016
- Gade, A.; Sherrill, B. M.
- Physica Scripta, Vol. 91, Issue 5
Correlated two-nucleon stripping reactions
journal, December 2004
- Tostevin, J. A.; Podolyák, G.; Brown, B. A.
- Physical Review C, Vol. 70, Issue 6
Determining the -Process Flow through : Resonances in Identified with GRETINA
journal, July 2014
- Langer, C.; Montes, F.; Aprahamian, A.
- Physical Review Letters, Vol. 113, Issue 3
Level Structure of : Implications for the Astrophysical Reaction Rate and for the Mass
journal, January 2005
- Seweryniak, D.; Woods, P. J.; Carpenter, M. P.
- Physical Review Letters, Vol. 94, Issue 3
Ground-State Proton Decay of and Implications for the Astrophysical Rapid Proton-Capture Process Waiting Point
journal, June 2011
- Rogers, A. M.; Famiano, M. A.; Lynch, W. G.
- Physical Review Letters, Vol. 106, Issue 25
Diffraction dissociation contributions to two-nucleon knockout reactions and the suppression of shell-model strength
journal, December 2006
- Tostevin, J. A.; Brown, B. A.
- Physical Review C, Vol. 74, Issue 6
An Analysis of the Energy Levels of the Mirror Nuclei, and
journal, December 1952
- Thomas, R. G.
- Physical Review, Vol. 88, Issue 5
On the Displacement of Corresponding Energy Levels of and
journal, February 1951
- Ehrman, Joachim B.
- Physical Review, Vol. 81, Issue 3
Correlations probed in direct two-nucleon removal reactions
journal, October 2010
- Simpson, E. C.; Tostevin, J. A.
- Physical Review C, Vol. 82, Issue 4
CAESAR—A high-efficiency CsI(Na) scintillator array for in-beam spectroscopy with fast rare-isotope beams
journal, December 2010
- Weisshaar, D.; Gade, A.; Glasmacher, T.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 624, Issue 3
Invariant-mass spectroscopy of excited states
journal, December 2019
- Charity, R. J.; Brown, K. W.; Okołowicz, J.
- Physical Review C, Vol. 100, Issue 6