Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra

N. G. Nicolis; D. G. Sarantites; C. Baktash; V. Abenante; L. A. Adler; J. R. Beene; F. A. Dilmanian; G. Garcia-Bermudez; H. C. Griffin; M. L. Halbert; D. C. Hensley; N. R. Johnson; I. Y. Lee; Z. Majka; F. K. McGowan; M. A. Riley; T. M. Semkow; D. W. Stracener; A. Virtanen

doi:10.1016/0375-9474(90)91143-F

Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra

N. G. Nicolis, D. G. Sarantites, C. Baktash, V. Abenante, L. A. Adler, J. R. Beene, F. A. Dilmanian, G. Garcia-Bermudez, H. C. Griffin, M. L. Halbert, D. C. Hensley, N. R. Johnson, I. Y. Lee, Z. Majka, F. K. McGowan, M. A. Riley, T. M. Semkow, D. W. Stracener, A. Virtanen

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Abstract

Emission barriers and subbarrier anisotropies from α decay of Sn^* and Yb^* compound nuclei are examined in the light of calculations incorporating deformation effects in the decay process. For the Yb^* systems deformation which increases with spin is necessary to explain the data. For the Sn^* systems the spectral shapes and anisotropies can be explained without deformation. For systems lighter than Sn this probe is not sensitive to the deformation. Energy spectra and angular correlations of evaporated protons from the ⁵²Cr(³⁴S, 2n2p)⁸²Sr reaction were measured in coincidence with discrete transitions. Large shifts in proton spectra were observed when high spin states in different rotational bands are populated. They are interpreted as due to near-yrast stretched proton emission preferentially populating the yrast band by subbarrier protons. Simulations show that channel selected proton spectra cannot be used as probes of deformation.

Original language	English
Pages (from-to)	c153-c168
Journal	Nuclear Physics A
Volume	520
Issue number	C
DOIs	https://doi.org/10.1016/0375-9474(90)91143-F
State	Published - Dec 1990
Externally published	Yes

Funding

that spectra and angular distributions of sub-barrier protons may provide a sensitive probe for connecting the population of the yrast band to the entry region. At present it appears that the sub-barrier shape of the proton spectra does not reflect deformation effects in a clear way as in the case of the alpha spectra. The authors acknowledge frui:ful discussions with T. Dessing. M.A.R.. "and A.V. acknowledge support from the Joint Institute for Heavy Ion Research. This work was supported in part by the U.S. Department of Energy under grant No. DE-FG02-88ER-40406. Oak Ridge National Laboratory is operated by Martin Marietta Energy Systems Inc. under Contract No. DE--ACO5-84Ol~21400 with the U.S. Department of Energy.

Funders	Funder number
Joint Institute for Heavy Ion Research
U.S. Department of Energy

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Nicolis, N. G., Sarantites, D. G., Baktash, C., Abenante, V., Adler, L. A., Beene, J. R., Dilmanian, F. A., Garcia-Bermudez, G., Griffin, H. C., Halbert, M. L., Hensley, D. C., Johnson, N. R., Lee, I. Y., Majka, Z., McGowan, F. K., Riley, M. A., Semkow, T. M., Stracener, D. W., & Virtanen, A. (1990). Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra. Nuclear Physics A, 520(C), c153-c168. https://doi.org/10.1016/0375-9474(90)91143-F

@article{1777ce3bf309431c93817bc04c23d0a6,

title = "Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra",

abstract = "Emission barriers and subbarrier anisotropies from α decay of Sn* and Yb* compound nuclei are examined in the light of calculations incorporating deformation effects in the decay process. For the Yb* systems deformation which increases with spin is necessary to explain the data. For the Sn* systems the spectral shapes and anisotropies can be explained without deformation. For systems lighter than Sn this probe is not sensitive to the deformation. Energy spectra and angular correlations of evaporated protons from the 52Cr(34S, 2n2p)82Sr reaction were measured in coincidence with discrete transitions. Large shifts in proton spectra were observed when high spin states in different rotational bands are populated. They are interpreted as due to near-yrast stretched proton emission preferentially populating the yrast band by subbarrier protons. Simulations show that channel selected proton spectra cannot be used as probes of deformation.",

author = "Nicolis, {N. G.} and Sarantites, {D. G.} and C. Baktash and V. Abenante and Adler, {L. A.} and Beene, {J. R.} and Dilmanian, {F. A.} and G. Garcia-Bermudez and Griffin, {H. C.} and Halbert, {M. L.} and Hensley, {D. C.} and Johnson, {N. R.} and Lee, {I. Y.} and Z. Majka and McGowan, {F. K.} and Riley, {M. A.} and Semkow, {T. M.} and Stracener, {D. W.} and A. Virtanen",

year = "1990",

month = dec,

doi = "10.1016/0375-9474(90)91143-F",

language = "English",

volume = "520",

pages = "c153--c168",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

number = "C",

}

Nicolis, NG, Sarantites, DG, Baktash, C, Abenante, V, Adler, LA, Beene, JR, Dilmanian, FA, Garcia-Bermudez, G, Griffin, HC, Halbert, ML, Hensley, DC, Johnson, NR, Lee, IY, Majka, Z, McGowan, FK, Riley, MA, Semkow, TM, Stracener, DW & Virtanen, A 1990, 'Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra', Nuclear Physics A, vol. 520, no. C, pp. c153-c168. https://doi.org/10.1016/0375-9474(90)91143-F

TY - JOUR

T1 - Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra

AU - Nicolis, N. G.

AU - Sarantites, D. G.

AU - Baktash, C.

AU - Abenante, V.

AU - Adler, L. A.

AU - Beene, J. R.

AU - Dilmanian, F. A.

AU - Garcia-Bermudez, G.

AU - Griffin, H. C.

AU - Halbert, M. L.

AU - Hensley, D. C.

AU - Johnson, N. R.

AU - Lee, I. Y.

AU - Majka, Z.

AU - McGowan, F. K.

AU - Riley, M. A.

AU - Semkow, T. M.

AU - Stracener, D. W.

AU - Virtanen, A.

PY - 1990/12

Y1 - 1990/12

N2 - Emission barriers and subbarrier anisotropies from α decay of Sn* and Yb* compound nuclei are examined in the light of calculations incorporating deformation effects in the decay process. For the Yb* systems deformation which increases with spin is necessary to explain the data. For the Sn* systems the spectral shapes and anisotropies can be explained without deformation. For systems lighter than Sn this probe is not sensitive to the deformation. Energy spectra and angular correlations of evaporated protons from the 52Cr(34S, 2n2p)82Sr reaction were measured in coincidence with discrete transitions. Large shifts in proton spectra were observed when high spin states in different rotational bands are populated. They are interpreted as due to near-yrast stretched proton emission preferentially populating the yrast band by subbarrier protons. Simulations show that channel selected proton spectra cannot be used as probes of deformation.

AB - Emission barriers and subbarrier anisotropies from α decay of Sn* and Yb* compound nuclei are examined in the light of calculations incorporating deformation effects in the decay process. For the Yb* systems deformation which increases with spin is necessary to explain the data. For the Sn* systems the spectral shapes and anisotropies can be explained without deformation. For systems lighter than Sn this probe is not sensitive to the deformation. Energy spectra and angular correlations of evaporated protons from the 52Cr(34S, 2n2p)82Sr reaction were measured in coincidence with discrete transitions. Large shifts in proton spectra were observed when high spin states in different rotational bands are populated. They are interpreted as due to near-yrast stretched proton emission preferentially populating the yrast band by subbarrier protons. Simulations show that channel selected proton spectra cannot be used as probes of deformation.

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U2 - 10.1016/0375-9474(90)91143-F

DO - 10.1016/0375-9474(90)91143-F

M3 - Article

AN - SCOPUS:4243515577

SN - 0375-9474

VL - 520

SP - c153-c168

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - C

ER -

Alpha-particle emission as a probe of nuclear shapes and structure effects in proton evaporation spectra

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