Recent results from the decay studies of high-energy isoscalar giant resonances

M. Hunyadi; A. M. van den Berg; N. Blasi; M. Csatlos; L. Csige; B. Davids; M. Fujiwara; U. Garg; J. Gulyas; M. N. Harakeh; M. A. de Huu; A. Krasznahorkay; D. Sohler; H. J. Wortche

Recent results from the decay studies of high-energy isoscalar giant resonances

M. Hunyadi^*, A. M. van den Berg, N. Blasi, M. Csatlos, L. Csige, B. Davids, M. Fujiwara, U. Garg, J. Gulyas, M. N. Harakeh, M. A. de Huu, A. Krasznahorkay, D. Sohler, H. J. Wortche

^*Corresponding author for this work

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Abstract

The direct and statistical neutron decay of the isoscalar giant dipole resonance and a continuum region at higher excitation energy has been studied in Zr-90, Sn-116 and Pb-208 using the (alpha, alpha'n) reaction at a bombarding energy of 200 MeV. The spectra of fast decay neutrons populating valence neutron-hole states were analyzed, and estimates for the branching ratios were determined to compare to recent theoretical predictions. The observation of the direct nucleon decay channels helped to separate giant resonance strengths and suppress the underlying background and continuum, which lead to an indication for the existence of the first overtone mode of the isoscalar giant quadrupole resonance.

Original language	English
Pages (from-to)	1479-1488
Number of pages	10
Journal	Acta Physica Polonica B
Volume	38
Issue number	4
Publication status	Published - Apr-2007
Event	41st Zakopane Conference on Nuclear Physics - , Poland Duration: 4-Sept-2006 → 10-Sept-2006

Keywords

INELASTIC ALPHA-SCATTERING
DIPOLE RESONANCE
PROTON EXCITATION
COMPRESSION MODES
PB-208
MONOPOLE

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title = "Recent results from the decay studies of high-energy isoscalar giant resonances",

abstract = "The direct and statistical neutron decay of the isoscalar giant dipole resonance and a continuum region at higher excitation energy has been studied in Zr-90, Sn-116 and Pb-208 using the (alpha, alpha'n) reaction at a bombarding energy of 200 MeV. The spectra of fast decay neutrons populating valence neutron-hole states were analyzed, and estimates for the branching ratios were determined to compare to recent theoretical predictions. The observation of the direct nucleon decay channels helped to separate giant resonance strengths and suppress the underlying background and continuum, which lead to an indication for the existence of the first overtone mode of the isoscalar giant quadrupole resonance.",

keywords = "INELASTIC ALPHA-SCATTERING, DIPOLE RESONANCE, PROTON EXCITATION, COMPRESSION MODES, PB-208, MONOPOLE",

author = "M. Hunyadi and {van den Berg}, {A. M.} and N. Blasi and M. Csatlos and L. Csige and B. Davids and M. Fujiwara and U. Garg and J. Gulyas and Harakeh, {M. N.} and {de Huu}, {M. A.} and A. Krasznahorkay and D. Sohler and Wortche, {H. J.}",

year = "2007",

month = apr,

language = "English",

volume = "38",

pages = "1479--1488",

journal = "Acta Physica Polonica B",

publisher = "JAGIELLONIAN UNIV PRESS",

number = "4",

note = "41st Zakopane Conference on Nuclear Physics ; Conference date: 04-09-2006 Through 10-09-2006",

}

TY - JOUR

T1 - Recent results from the decay studies of high-energy isoscalar giant resonances

AU - Hunyadi, M.

AU - van den Berg, A. M.

AU - Blasi, N.

AU - Csatlos, M.

AU - Csige, L.

AU - Davids, B.

AU - Fujiwara, M.

AU - Garg, U.

AU - Gulyas, J.

AU - Harakeh, M. N.

AU - de Huu, M. A.

AU - Krasznahorkay, A.

AU - Sohler, D.

AU - Wortche, H. J.

PY - 2007/4

Y1 - 2007/4

N2 - The direct and statistical neutron decay of the isoscalar giant dipole resonance and a continuum region at higher excitation energy has been studied in Zr-90, Sn-116 and Pb-208 using the (alpha, alpha'n) reaction at a bombarding energy of 200 MeV. The spectra of fast decay neutrons populating valence neutron-hole states were analyzed, and estimates for the branching ratios were determined to compare to recent theoretical predictions. The observation of the direct nucleon decay channels helped to separate giant resonance strengths and suppress the underlying background and continuum, which lead to an indication for the existence of the first overtone mode of the isoscalar giant quadrupole resonance.

AB - The direct and statistical neutron decay of the isoscalar giant dipole resonance and a continuum region at higher excitation energy has been studied in Zr-90, Sn-116 and Pb-208 using the (alpha, alpha'n) reaction at a bombarding energy of 200 MeV. The spectra of fast decay neutrons populating valence neutron-hole states were analyzed, and estimates for the branching ratios were determined to compare to recent theoretical predictions. The observation of the direct nucleon decay channels helped to separate giant resonance strengths and suppress the underlying background and continuum, which lead to an indication for the existence of the first overtone mode of the isoscalar giant quadrupole resonance.

KW - INELASTIC ALPHA-SCATTERING

KW - DIPOLE RESONANCE

KW - PROTON EXCITATION

KW - COMPRESSION MODES

KW - PB-208

KW - MONOPOLE

M3 - Article

VL - 38

SP - 1479

EP - 1488

JO - Acta Physica Polonica B

JF - Acta Physica Polonica B

IS - 4

T2 - 41st Zakopane Conference on Nuclear Physics

Y2 - 4 September 2006 through 10 September 2006

ER -

Recent results from the decay studies of high-energy isoscalar giant resonances

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Keywords

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