Abstract
4He possesses a second 0+ state; the transition form factor has been measured via inelastic electron scattering. The nature of the 02+ state's spatial structure has been controversial. An accurate four-nucleon calculation utilizing a realistic NN force (Argonne V8′) plus phenomenological NNN three-body force has been performed for both the 4He ground state and second 0+ state (E x = 20.21 MeV) using the Gaussian expansion method. The calculated one-body densities and transition density show a significant difference between the states. The resulting impulse approximation transition form factor 4He(e,e′) He(02+) agrees with the available data. The overlap of the 02+ wave function with the trinucleon ground state suggests that the structure is primarily a loosely bound 3N+N system and not a breathing mode. It is found that a major part of the energy-weighted E0 sum rule value is exhausted by nonresonant, low-energy continuum states other than the second 0+ state, in contrast to heavier nuclei where a dominant fraction of the sum-rule limit is exhausted by the second 0+ state because it corresponds to a collective, breathing mode.
| Original language | English |
|---|---|
| Article number | 031001 |
| Pages (from-to) | 310011-310015 |
| Number of pages | 5 |
| Journal | Physical Review C - Nuclear Physics |
| Volume | 70 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Sep 2004 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
Cite this
Four-body calculation of the first excited state of4He using a realistic NN interaction : 4He(e,e′)4He(0 2+) and the monopole sum rule. / Hiyama, E.; Gibson, B. F.; Kamimura, M.
In: Physical Review C - Nuclear Physics, Vol. 70, No. 3, 031001, 09.2004, p. 310011-310015.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Four-body calculation of the first excited state of4He using a realistic NN interaction
T2 - 4He(e,e′)4He(0 2+) and the monopole sum rule
AU - Hiyama, E.
AU - Gibson, B. F.
AU - Kamimura, M.
PY - 2004/9
Y1 - 2004/9
N2 - 4He possesses a second 0+ state; the transition form factor has been measured via inelastic electron scattering. The nature of the 02+ state's spatial structure has been controversial. An accurate four-nucleon calculation utilizing a realistic NN force (Argonne V8′) plus phenomenological NNN three-body force has been performed for both the 4He ground state and second 0+ state (E x = 20.21 MeV) using the Gaussian expansion method. The calculated one-body densities and transition density show a significant difference between the states. The resulting impulse approximation transition form factor 4He(e,e′) He(02+) agrees with the available data. The overlap of the 02+ wave function with the trinucleon ground state suggests that the structure is primarily a loosely bound 3N+N system and not a breathing mode. It is found that a major part of the energy-weighted E0 sum rule value is exhausted by nonresonant, low-energy continuum states other than the second 0+ state, in contrast to heavier nuclei where a dominant fraction of the sum-rule limit is exhausted by the second 0+ state because it corresponds to a collective, breathing mode.
AB - 4He possesses a second 0+ state; the transition form factor has been measured via inelastic electron scattering. The nature of the 02+ state's spatial structure has been controversial. An accurate four-nucleon calculation utilizing a realistic NN force (Argonne V8′) plus phenomenological NNN three-body force has been performed for both the 4He ground state and second 0+ state (E x = 20.21 MeV) using the Gaussian expansion method. The calculated one-body densities and transition density show a significant difference between the states. The resulting impulse approximation transition form factor 4He(e,e′) He(02+) agrees with the available data. The overlap of the 02+ wave function with the trinucleon ground state suggests that the structure is primarily a loosely bound 3N+N system and not a breathing mode. It is found that a major part of the energy-weighted E0 sum rule value is exhausted by nonresonant, low-energy continuum states other than the second 0+ state, in contrast to heavier nuclei where a dominant fraction of the sum-rule limit is exhausted by the second 0+ state because it corresponds to a collective, breathing mode.
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U2 - 10.1103/PhysRevC.70.031001
DO - 10.1103/PhysRevC.70.031001
M3 - Article
AN - SCOPUS:10044256414
VL - 70
SP - 310011
EP - 310015
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
SN - 0556-2813
IS - 3
M1 - 031001
ER -