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Title: Signatures of the d * ( 2380 ) Hexaquark in d ( γ , p n )

Abstract

We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300–700 MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around Eγ ~ 570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d*(2380) hexaquark.

Authors:
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Publication Date:
Research Org.:
Kent State Univ., Kent, OH (United States); George Washington Univ., Washington, DC (United States); Univ. of Massachusetts, Amherst, MA (United States); George Washington Univ., Ashburn, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Contributing Org.:
A2 Collaboration at MAMI
OSTI Identifier:
1607825
Alternate Identifier(s):
OSTI ID: 1607774; OSTI ID: 1659119; OSTI ID: 1726257
Grant/Contract Number:  
SC0014323; FG02-99ER41110; FG02-88ER40415; FG02-01ER41194; FG02-99-ER41110; SC0016583
Resource Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Name: Physical Review Letters Journal Volume: 124 Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Hexaquark; deuteron photodisintegration; recoil neutron polarization

Citation Formats

Bashkanov, M., Watts, D. P., Kay, S. J. D., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Ahmed, Z., Akondi, C. S., Annand, J. R. M., Arends, H. J., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Briscoe, W. J., Cividini, F., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fegan, S., Fix, A., Gardner, S., Ghosal, D., Glazier, D. I., Gorodnov, I., Gradl, W., Günther, M., Gurevich, D., Heijkenskjöld, L., Hornidge, D., Huber, G. M., Käser, A., Kashevarov, V. L., Korolija, M., Krusche, B., Lazarev, A., Livingston, K., Lutterer, S., MacGregor, I. J. D., Manley, D. M., Martel, P. P., Miskimen, R., Mornacchi, E., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Otte, P. B., Paudyal, D., Pedroni, P., Powell, A., Prakhov, S. N., Ron, G., Sarty, A., Sfienti, C., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I. I., Strub, T., Supek, I., Thiel, A., Thiel, M., Thomas, A., Usov, Yu. A., Wagner, S., Walford, N. K., Werthmüller, D., Wettig, J., Wolfes, M., Zachariou, N., Zana, L. A., and A2 Collaboration at MAMI. Signatures of the d * ( 2380 ) Hexaquark in d ( γ , p n → ). United States: N. p., 2020. Web. doi:10.1103/PhysRevLett.124.132001.
Bashkanov, M., Watts, D. P., Kay, S. J. D., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Ahmed, Z., Akondi, C. S., Annand, J. R. M., Arends, H. J., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Briscoe, W. J., Cividini, F., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fegan, S., Fix, A., Gardner, S., Ghosal, D., Glazier, D. I., Gorodnov, I., Gradl, W., Günther, M., Gurevich, D., Heijkenskjöld, L., Hornidge, D., Huber, G. M., Käser, A., Kashevarov, V. L., Korolija, M., Krusche, B., Lazarev, A., Livingston, K., Lutterer, S., MacGregor, I. J. D., Manley, D. M., Martel, P. P., Miskimen, R., Mornacchi, E., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Otte, P. B., Paudyal, D., Pedroni, P., Powell, A., Prakhov, S. N., Ron, G., Sarty, A., Sfienti, C., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I. I., Strub, T., Supek, I., Thiel, A., Thiel, M., Thomas, A., Usov, Yu. A., Wagner, S., Walford, N. K., Werthmüller, D., Wettig, J., Wolfes, M., Zachariou, N., Zana, L. A., & A2 Collaboration at MAMI. Signatures of the d * ( 2380 ) Hexaquark in d ( γ , p n → ). United States. doi:https://doi.org/10.1103/PhysRevLett.124.132001
Bashkanov, M., Watts, D. P., Kay, S. J. D., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Ahmed, Z., Akondi, C. S., Annand, J. R. M., Arends, H. J., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Briscoe, W. J., Cividini, F., Collicott, C., Costanza, S., Denig, A., Downie, E. J., Drexler, P., Fegan, S., Fix, A., Gardner, S., Ghosal, D., Glazier, D. I., Gorodnov, I., Gradl, W., Günther, M., Gurevich, D., Heijkenskjöld, L., Hornidge, D., Huber, G. M., Käser, A., Kashevarov, V. L., Korolija, M., Krusche, B., Lazarev, A., Livingston, K., Lutterer, S., MacGregor, I. J. D., Manley, D. M., Martel, P. P., Miskimen, R., Mornacchi, E., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Otte, P. B., Paudyal, D., Pedroni, P., Powell, A., Prakhov, S. N., Ron, G., Sarty, A., Sfienti, C., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I. I., Strub, T., Supek, I., Thiel, A., Thiel, M., Thomas, A., Usov, Yu. A., Wagner, S., Walford, N. K., Werthmüller, D., Wettig, J., Wolfes, M., Zachariou, N., Zana, L. A., and A2 Collaboration at MAMI. Tue . "Signatures of the d * ( 2380 ) Hexaquark in d ( γ , p n → )". United States. doi:https://doi.org/10.1103/PhysRevLett.124.132001.
@article{osti_1607825,
title = {Signatures of the d * ( 2380 ) Hexaquark in d ( γ , p n → )},
author = {Bashkanov, M. and Watts, D. P. and Kay, S. J. D. and Abt, S. and Achenbach, P. and Adlarson, P. and Afzal, F. and Ahmed, Z. and Akondi, C. S. and Annand, J. R. M. and Arends, H. J. and Beck, R. and Biroth, M. and Borisov, N. and Braghieri, A. and Briscoe, W. J. and Cividini, F. and Collicott, C. and Costanza, S. and Denig, A. and Downie, E. J. and Drexler, P. and Fegan, S. and Fix, A. and Gardner, S. and Ghosal, D. and Glazier, D. I. and Gorodnov, I. and Gradl, W. and Günther, M. and Gurevich, D. and Heijkenskjöld, L. and Hornidge, D. and Huber, G. M. and Käser, A. and Kashevarov, V. L. and Korolija, M. and Krusche, B. and Lazarev, A. and Livingston, K. and Lutterer, S. and MacGregor, I. J. D. and Manley, D. M. and Martel, P. P. and Miskimen, R. and Mornacchi, E. and Mullen, C. and Neganov, A. and Neiser, A. and Ostrick, M. and Otte, P. B. and Paudyal, D. and Pedroni, P. and Powell, A. and Prakhov, S. N. and Ron, G. and Sarty, A. and Sfienti, C. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky, I. I. and Strub, T. and Supek, I. and Thiel, A. and Thiel, M. and Thomas, A. and Usov, Yu. A. and Wagner, S. and Walford, N. K. and Werthmüller, D. and Wettig, J. and Wolfes, M. and Zachariou, N. and Zana, L. A. and A2 Collaboration at MAMI},
abstractNote = {We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300–700 MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around Eγ ~ 570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d*(2380) hexaquark.},
doi = {10.1103/PhysRevLett.124.132001},
journal = {Physical Review Letters},
number = 13,
volume = 124,
place = {United States},
year = {2020},
month = {3}
}

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DOI: https://doi.org/10.1103/PhysRevLett.124.132001

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Works referenced in this record:

A Nuclear Photo-effect: Disintegration of the Diplon by -Rays
journal, August 1934

  • Chadwick, J.; Goldhaber, M.
  • Nature, Vol. 134, Issue 3381
  • DOI: 10.1038/134237a0

Branching ratios for the decay of d*(2380)
journal, July 2015


Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?
journal, June 2011


Polarization Measurements in High-Energy Deuteron Photodisintegration
journal, April 2001


The 1.5GeV harmonic double-sided microtron at Mainz University
journal, August 2008

  • Kaiser, K. -H.; Aulenbacher, K.; Chubarov, O.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 593, Issue 3
  • DOI: 10.1016/j.nima.2008.05.018

Radiative capture of polarized neutrons by hydrogen below the pion production threshold
journal, October 1986


Updated analysis of N N elastic scattering to 3 GeV
journal, August 2007


Deuteron photodisintegration by polarized photons in the region of the d⁎(2380)
journal, February 2019


Measurement of the $\overrightarrow{n} p\rightarrow d\pi^{0}\pi^{0}$ reaction with polarized beam in the region of the d*(2380) resonance
journal, May 2016


Radiative capture of polarized neutrons above pion production threshold
journal, October 1987


Multipole analysis of resonance photoproduction
journal, February 1976


Two-body photodisintegration of the deuteron from 100 to 800 MeV
journal, June 1996


The d⁎(2380) in Neutron Stars — A New Degree of Freedom?
journal, June 2018


Double-Pionic Fusion of Nuclear Systems and the “ABC” Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements
journal, February 2009


Polarization of Neutrons from the Photodisintegration of Deuterium
journal, May 1963


Polarization of Neutrons from the Photodisintegration of Deuterium
journal, February 1963


DAPHNE: a large-acceptance tracking detector for the study of photoreactions at intermediate energies
journal, March 1991

  • Audit, G.; Bloch, A.; D'Hose, N.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 301, Issue 3
  • DOI: 10.1016/0168-9002(91)90013-G

Neutron-proton scattering in the context of the d * (2380) resonance
journal, September 2014


Geant4—a simulation toolkit
journal, July 2003

  • Agostinelli, S.; Allison, J.; Amako, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3
  • DOI: 10.1016/S0168-9002(03)01368-8

Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect
journal, April 2013


Measurement of the np → npπ 0 π 0 reaction in search for the recently observed d ⁎ (2380) resonance
journal, April 2015


Possible Existence of a Deeply Bound Δ Δ System
journal, February 1977


Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C
journal, June 2008

  • McGeorge, J. C.; Kellie, J. D.; Annand, J. R. M.
  • The European Physical Journal A, Vol. 37, Issue 1
  • DOI: 10.1140/epja/i2007-10606-0

Measurements of the Polarization of Protons from Deuteron Photodisintegration
journal, January 1968


Evidence for a New Resonance from Polarized Neutron-Proton Scattering
journal, May 2014


Measurement of K p η Λ near threshold
journal, October 2001