Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier

I. Ahmad; S. M. Austin; B. B. Back; R. R. Betts; F. P. Calaprice; K. C. Chan; A. Chishti; P. Chowdhury; C. Conner; R. W. Dunford; J. D. Fox; S. J. Freedman; M. Freer; S. B. Gazes; A. L. Hallin; T. Happ; D. Henderson; N. I. Kaloskamis; E. Kashy; W. Kutschera; J. Last; C. J. Lister; M. Liu; M. R. Maier; D. J. Mercer; D. Mikolas; P. A.A. Perera; M. D. Rhein; D. E. Roa; J. P. Schiffer; T. A. Trainor; P. Wilt; J. S. Winfield; M. Wolanski; F. L.H. Wolfs; A. H. Wuosmaa; G. Xu; A. Young; J. E. Yurkon

doi:10.1103/PhysRevLett.75.2658

Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier

I. Ahmad, S. M. Austin, B. B. Back, R. R. Betts, F. P. Calaprice, K. C. Chan, A. Chishti, P. Chowdhury, C. Conner, R. W. Dunford, J. D. Fox, S. J. Freedman, M. Freer, S. B. Gazes, A. L. Hallin, T. Happ, D. Henderson, N. I. Kaloskamis, E. Kashy, W. KutscheraJ. Last, C. J. Lister, M. Liu, M. R. Maier, D. J. Mercer, D. Mikolas, P. A.A. Perera, M. D. Rhein, D. E. Roa, J. P. Schiffer, T. A. Trainor, P. Wilt, J. S. Winfield, M. Wolanski, F. L.H. Wolfs, A. H. Wuosmaa, G. Xu, A. Young, J. E. Yurkon

Physics

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Abstract

The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Data were collected for 238U +181Ta at 5.95, 6.10, and 6.30 MeV/u and 238U +232Th at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolated decay of a neutral particle of mass 1.4-2.1 MeV/ c2, the upper limits on cross sections obtained from the present data are significantly less than the previously reported cross sections.

Original language	English (US)
Pages (from-to)	2658-2661
Number of pages	4
Journal	Physical review letters
Volume	75
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.75.2658
State	Published - 1995

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.75.2658

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Ahmad, I., Austin, S. M., Back, B. B., Betts, R. R., Calaprice, F. P., Chan, K. C., Chishti, A., Chowdhury, P., Conner, C., Dunford, R. W., Fox, J. D., Freedman, S. J., Freer, M., Gazes, S. B., Hallin, A. L., Happ, T., Henderson, D., Kaloskamis, N. I., Kashy, E., ... Yurkon, J. E. (1995). Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier. Physical review letters, 75(14), 2658-2661. https://doi.org/10.1103/PhysRevLett.75.2658

@article{890b939dcd6b426cbbe9de083833dcb1,

title = "Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier",

abstract = "The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Data were collected for 238U +181Ta at 5.95, 6.10, and 6.30 MeV/u and 238U +232Th at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolated decay of a neutral particle of mass 1.4-2.1 MeV/ c2, the upper limits on cross sections obtained from the present data are significantly less than the previously reported cross sections.",

author = "I. Ahmad and Austin, {S. M.} and Back, {B. B.} and Betts, {R. R.} and Calaprice, {F. P.} and Chan, {K. C.} and A. Chishti and P. Chowdhury and C. Conner and Dunford, {R. W.} and Fox, {J. D.} and Freedman, {S. J.} and M. Freer and Gazes, {S. B.} and Hallin, {A. L.} and T. Happ and D. Henderson and Kaloskamis, {N. I.} and E. Kashy and W. Kutschera and J. Last and Lister, {C. J.} and M. Liu and Maier, {M. R.} and Mercer, {D. J.} and D. Mikolas and Perera, {P. A.A.} and Rhein, {M. D.} and Roa, {D. E.} and Schiffer, {J. P.} and Trainor, {T. A.} and P. Wilt and Winfield, {J. S.} and M. Wolanski and Wolfs, {F. L.H.} and Wuosmaa, {A. H.} and G. Xu and A. Young and Yurkon, {J. E.}",

year = "1995",

doi = "10.1103/PhysRevLett.75.2658",

language = "English (US)",

volume = "75",

pages = "2658--2661",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "14",

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Ahmad, I, Austin, SM, Back, BB, Betts, RR, Calaprice, FP, Chan, KC, Chishti, A, Chowdhury, P, Conner, C, Dunford, RW, Fox, JD, Freedman, SJ, Freer, M, Gazes, SB, Hallin, AL, Happ, T, Henderson, D, Kaloskamis, NI, Kashy, E, Kutschera, W, Last, J, Lister, CJ, Liu, M, Maier, MR, Mercer, DJ, Mikolas, D, Perera, PAA, Rhein, MD, Roa, DE, Schiffer, JP, Trainor, TA, Wilt, P, Winfield, JS, Wolanski, M, Wolfs, FLH, Wuosmaa, AH, Xu, G, Young, A & Yurkon, JE 1995, 'Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier', Physical review letters, vol. 75, no. 14, pp. 2658-2661. https://doi.org/10.1103/PhysRevLett.75.2658

TY - JOUR

T1 - Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier

AU - Ahmad, I.

AU - Austin, S. M.

AU - Back, B. B.

AU - Betts, R. R.

AU - Calaprice, F. P.

AU - Chan, K. C.

AU - Chishti, A.

AU - Chowdhury, P.

AU - Conner, C.

AU - Dunford, R. W.

AU - Fox, J. D.

AU - Freedman, S. J.

AU - Freer, M.

AU - Gazes, S. B.

AU - Hallin, A. L.

AU - Happ, T.

AU - Henderson, D.

AU - Kaloskamis, N. I.

AU - Kashy, E.

AU - Kutschera, W.

AU - Last, J.

AU - Lister, C. J.

AU - Liu, M.

AU - Maier, M. R.

AU - Mercer, D. J.

AU - Mikolas, D.

AU - Perera, P. A.A.

AU - Rhein, M. D.

AU - Roa, D. E.

AU - Schiffer, J. P.

AU - Trainor, T. A.

AU - Wilt, P.

AU - Winfield, J. S.

AU - Wolanski, M.

AU - Wolfs, F. L.H.

AU - Wuosmaa, A. H.

AU - Xu, G.

AU - Young, A.

AU - Yurkon, J. E.

PY - 1995

Y1 - 1995

N2 - The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Data were collected for 238U +181Ta at 5.95, 6.10, and 6.30 MeV/u and 238U +232Th at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolated decay of a neutral particle of mass 1.4-2.1 MeV/ c2, the upper limits on cross sections obtained from the present data are significantly less than the previously reported cross sections.

AB - The first results are presented from a new experiment, APEX, designed to study the previously reported sharp lines in sum-energy spectra of positrons and electrons produced in collisions of very heavy ions. Data were collected for 238U +181Ta at 5.95, 6.10, and 6.30 MeV/u and 238U +232Th at 5.95 MeV/u. In none of our analyses is any evidence found for sharp sum-energy lines. For the specific case of the isolated decay of a neutral particle of mass 1.4-2.1 MeV/ c2, the upper limits on cross sections obtained from the present data are significantly less than the previously reported cross sections.

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UR - http://www.scopus.com/inward/citedby.url?scp=0001113568&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.75.2658

DO - 10.1103/PhysRevLett.75.2658

M3 - Article

C2 - 10059372

AN - SCOPUS:0001113568

SN - 0031-9007

VL - 75

SP - 2658

EP - 2661

JO - Physical review letters

JF - Physical review letters

IS - 14

ER -

Search for narrow sum-energy lines in electron-positron pair emission from heavy-ion collisions near the coulomb barrier

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