Hidetoshi Akimune

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• Ph D
• Professor (Full) at Konan University

The incompressibility of infinite nuclear matter (K_\infty) is a parameter in the description of the nuclear equation of state that governs the energy cost associated with density oscillations near the saturation density. The most direct experimental method for studying this property of infinite nuclear matter is to probe the isoscalar giant monopo...

The radiative-decay probability of the Hoyle state is actually controversial because new data which contradicts the currently adopted value has been recently reported. In this work, we performed the new reliable measurement of the radiative-decay probability of the Hoyle state. We successfully obtained 40 triplecoincidence events of scattered α par...

Angular distributions of the elastic and inelastic deuteron-nucleus scattering off $^{24}$Mg, $^{28}$Si, $^{58}$Ni, $^{90}$Zr, $^{116}$Sn, and $^{208}$Pb have been measured at a beam energy of 98 MeV/nucleon, with the goal of constraining the deuteron optical potential in this kinematical regime, and to extract the reduced transition probabilities...

The strength distributions of the Isoscalar Giant Monopole Resonance (ISGMR) and Isoscalar Giant Quadrupole Resonance (ISGQR) in 142,146-150Nd have been determined via inelastic alpha-particle scattering with the Grand Raiden (GR) Spectrometer at the Research Center for Nuclear Physics (RCNP), Japan. In the deformed nuclei 146-150Nd, the ISGMR stre...

We simultaneously measured the $^4$He($\gamma, n$)$^3$He and $^4$He($\gamma, p$)$^3$H reactions in the energy range around the giant dipole resonance. A quasi-monoenergetic photon beam produced via the laser Compton scattering technique was irradiated on the active-target time-projection chamber filled with helium gas, and trajectories of charged d...

We simultaneously measured the He4(γ, n)He3 and He4(γ, p)H3 reactions in the energy range around the giant dipole resonance. A quasi-monoenergetic photon beam produced via the laser Compton scattering technique was irradiated on the active-target time-projection chamber filled with helium gas, and trajectories of charged decay particles emitted fro...

The reaction rate of the triple-alpha reaction can be enhanced in hot and dense environments due to the deexcitation of the Hoyle state in ¹² C by neutrons. The cross section of the deexcitation should be determined for the enhanced reaction rate. We plan to obtain the cross section by measuring the inverse reaction using a neutron beam around 10 M...

We conducted the coincidence measurement of α particles inelastically scattered from ²⁰Ne at 0° and decay charged particles in order to search for the alpha-particle condensed state. We compared the measured excitation-energy spectrum and decay branching ratio with the statistical-decay-model calculations, and found that the newly observed states a...

The triple alpha reaction is one of the most important reactions in the nuclear astrophysics. However, its reaction rate in high temperature environments at T9> 2 was still uncertain. One of the major origins of the uncertainty was that the radiative-decay probability of the 31− state in ¹²C was unknown. In the present work, we have determined the...

An inelastic α-scattering experiment on the unstable N=Z, doubly-magic 56Ni nucleus was performed in inverse kinematics at an incident energy of 50 A.MeV at GANIL. High multiplicity for α-particle emission was observed within the limited phase-space of the experimental setup. This observation cannot be explained by means of the statistical-decay mo...

An inelastic $\alpha$-scattering experiment on the unstable $N=Z$, doubly-magic $^{56}$Ni nucleus was performed in inverse kinematics at an incident energy of 50 A.MeV at GANIL. High multiplicity for $\alpha$-particle emission was observed within the limited phase-space of the experimental setup. This observation cannot be explained by means of the...

The alpha-particle condensed state in finite nuclei will shed light on low-density nuclear matter. We carried out the coincidence measurement of $\alpha$ particles inelastically scattered from ${}^{20}\rm Ne$ at $0^{\circ}$ and decay charged particles. We compared the measured excitation-energy spectrum and decay branching ratio with the statistica...

“Why are the tin isotopes soft?” has remained, for the past decade, an open problem in nuclear structure physics: models which reproduce the isoscalar giant monopole resonance (ISGMR) in the “doubly-closed shell” nuclei, ⁹⁰Zr and ²⁰⁸Pb, overestimate the ISGMR energies of the open-shell tin and cadmium nuclei, by as much as 1 MeV. In an effort to sh...

"Why are the tin isotopes soft?" has remained, for the past decade, an open problem in nuclear structure physics: models which reproduce the isoscalar giant monopole resonance (ISGMR) in the "doubly-closed shell" nuclei, $^{90}$Zr and $^{208}$Pb, overestimate the ISGMR energies of the open-shell tin and cadmium nuclei, by as much as 1 MeV. In an ef...

Nuclear matrix elements (NMEs) for double beta decays (DBDs) are crucial for studying the neutrino mass and other neutrino properties beyond the standard electro-weak model by measuring neutrino-less DBDs. The spin-dipole (SD) Jπ = 2⁻ NME is one of the major components associated with the DBD NME. The SD NME for ⁷⁶Ge was derived for the first time...

The Gamow–Teller strength distributions of \({^{116} \text {Sb}}\) and \({^{122} \text {Sb}}\) were measured with the \({^{116,122} \text {Sn} (^{3} \text {He},t) ^{116,122} \text {Sb}}\) charge-exchange reactions at \({140 \ \text {MeV/u}}\). The measurements were carried out at the Research Center for Nuclear Physics (RCNP) at Osaka University in...

Recent data on isoscalar giant monopole resonance (ISGMR) in the calcium isotopes 40,44,48Ca have suggested that Kτ, the asymmetry term in the nuclear incompressibility, has a positive value. A value of Kτ>0 is entirely incompatible with present theoretical frameworks and, if correct, would have far-reaching implications on our understanding of myr...

Recent data on isoscalar giant monopole resonance (ISGMR) in the calcium isotopes \nuc{40,44,48}{Ca} have suggested that $K_\tau$, the asymmetry term in the nuclear incompressibility, has a positive value. A value of $K_\tau > 0$ is entirely incompatible with present theoretical frameworks and, if correct, would have far-reaching implications on ou...

DOI:https://doi.org/10.1103/PhysRevC.100.049901

We measured both the differential cross section (σp,p′=d2σ/dΩdEx) and the γ-ray emission probability [Rγ(Ex)=σp,p′γ/σp,p′] from the giant resonances excited by C12(p,p′) reaction at 392 MeV and 0∘, using a magnetic spectrometer and an array of NaI(Tl) counters. The absolute value of Rγ(Ex) was calibrated by using the well-known γ-ray emission proba...

We measured both the differential cross section ($\sigma_{p,p^\prime}$ $=d^2\sigma/d\Omega dE_{x}$) and the $\gamma$-ray emission probability ($R_\gamma(E_x)$ $=\sigma_{p,p^\prime\gamma}$/$\sigma_{p,p^\prime}$) from the giant resonances excited by $\rm^{12}C$(\textit{p,p}$^\prime$) reaction at 392 MeV and 0$^\circ$, using a magnetic spectrometer an...

The isoscalar giant monopole, dipole, and quadrupole strength distributions have been deduced in Zr90,92 and Mo92 from “background-free” spectra of inelastic α-particle scattering at a beam energy of 385 MeV at extremely forward angles, including 0∘. These strength distributions were extracted by a multipole-decomposition analysis based on the expe...

The isoscalar giant monopole, dipole, and quadrupole strength distributions have been deduced in $^{90, 92}$Zr, and $^{92}$Mo from "background-free" spectra of inelastic $\alpha$-particle scattering at a beam energy of 385 MeV at extremely forward angles, including 0$^{\circ}$. These strength distributions were extracted by a multipole-decompositio...

We systematically measured the differential cross sections of inelastic α scattering off self-conjugate A=4n nuclei at two incident energies Eα=130MeV and 386MeV at Research Center for Nuclear Physics, Osaka University. The measured cross sections were analyzed by the distorted-wave Born-approximation (DWBA) calculation using the single-folding pot...

The phtodisintegration reactions of ⁴He nuclei i.e., ⁴He(γ,pt) and ⁴He(γ,³He)n, play crucial roles for the nucleosynthesis in the universe, but the result of previous experimental studys show sizable discrepancies. We performed the measurement of these reactions with the TPC-based MAIKo active target. The MAIKo active target enable us to detect, th...

Excited states in ¹²C nuclei play a very important role in the nucleosynthesis in the universe. ¹²C nuclei are synthesized by the triple α reaction. Normally the triple α process proceeds via the state (Hoyle states) at Ex = 7.65 MeV in ¹²C. However, at high temperature T > 10⁹, the highly excited 3α resonance states such as the state at Ex = 9.64...

The giant dipole resonance (GDR) in Li6 was investigated via the Li6(γ,xn) reactions by using quasi-mono-energy γ rays in an energy range from 4.9 to 53.6 MeV. The γ rays were generated via Compton backscattering of Nd laser photons with relativistic energy electrons in an electron storage ring, NewSUBARU. The energy resolution in a full width at h...

The ($^{11}$B,$^{11}$Li) double charge-exchange reaction (DCER) at $E(^{11}$B)/$A$=80 MeV was measured for the first time to demonstrate the feasibility of the reaction for studying neutrino nuclear responses for double beta decays (DBD). The $^{13}$C($^{11}$B,$^{11}$Li)$^{13}$O reaction shows strengths at the ground state and low and high excitati...

"Background-free" spectra of inelastic $\alpha$-particle scattering have been measured at a beam energy of 385 MeV in $^{90, 92}$Zr and $^{92}$Mo at extremely forward angles, including 0$^{\circ}$. The ISGMR strength distributions for the three nuclei coincide with each other, establishing clearly that nuclear incompressibility is not influenced by...

"Background-free" spectra of inelastic $\alpha$-particle scattering have been measured at a beam energy of 385 MeV in $^{90, 92}$Zr and $^{92}$Mo at extremely forward angles, including 0$^{\circ}$. The ISGMR strength distributions for the three nuclei coincide with each other, establishing clearly that nuclear incompressibility is not influenced by...

The ϕ-Λ(1520) interference effect in the γp→K^{+}K^{-}p reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between ϕ and Λ(1520) production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support strong constructive interference wh...

Multipole strength distributions for isoscalar L≤2 transitions in Si28 have been extracted using 386-MeV inelastic α scattering at extremely forward angles, including 0∘. Observed strength distributions are in good agreement with microscopic calculations for an oblate-deformed ground state. In particular, a large peak at an excitation energy of 17....

Strength distributions for isoscalar giant resonances with multipolarity L≤2 have been determined in Mg24 from "instrumental background-free" inelastic scattering of 386-MeV α particles at extreme forward angles, including 0. The isoscalar E0, E1, and E2 strengths are observed to be 57±7%, 111.1-7.2+10.9%, and 148.6±7.3%, respectively, of their ene...

We have measured the azimuthal anisotropy of neutrons emitted from the Fe56(γ,n)Fe55 reaction with a linearly polarized γ-ray beam generated by laser Compton scattering at NewSUBARU. Neutron yields at the polar angle of 90 have been measured as a function of the azimuthal angle φ between the detector and the linear polarization plane of the γ-ray b...

The $\phi$-$\Lambda(1520)$ interference effect in the $\gamma p\to K^+K^-p$ reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between $\phi$ and $\Lambda(1520)$ production amplitudes were obtained in the kinematic region where the two resonances overlap. The measurement results support st...

We report the use of an electron light source (ELS) located at the Telescope Array Observatory in Utah, USA, to measure the isotropic microwave radiation from air showers. To simulate extensive air showers, the ELS emits an electron beam into the atmosphere and a parabola antenna system for the satellite communication is used to measure the microwa...

The Isoscalar Giant Monopole Resonance (ISGMR) and the Isoscalar GiantDipole Resonance (ISGDR) compression modes have been studied in thedoubly-magic unstable nucleus 56Ni. They were measured by inelastic α-particlescattering in inverse kinematics at 50 MeV/u with the MAYA active targetat the GANIL facility. The centroid of the ISGMR has been obtai...

Laser Compton scattering gamma-ray beam source has been developed at the NewSUBARU synchrotron light facility. The available maximum Gamma-ray photon energy is 76 MeV. The flux of quasi-monochromatic gamma-ray photons (for example: 16.7 MeV, ΔE/E ~ 5%) is more than 106photons/sec using a 35 W Nd:YVO4 laser combined with the 1 GeV storage electron b...

The giant dipole resonance (GDR) in 6Li was investigated via the 6LI(γ, xn) reaction, where x = 1, 2 or 3 at an incident energy range of Eγ =5-55. The(γ, n) cross section was the most dominant cross section among them. The GDR in 6Li was found to consist of two components at Ex = 11 MeV and 33 MeV. The component at Ex = 11 MeV seems to be the intri...

The isoscalar giant monopole resonance (ISGMR) strength distribution in $^{24}$Mg has been determined from background-free inelastic scattering of 386-MeV $\alpha$ particles at extreme forward angles, including 0$^{\circ}$. The ISGMR strength distribution has been observed for the first time to have a two-peak structure in a light-mass nucleus. Thi...

The 77Se (γ, n) cross section was measured for the energy range from 7.6 to 13.8 MeV by using quasi-monochromatic laser-Compton scattering γ-rays. The advanced method to deduce γ-ray strength functions from (γ, n) cross section was developed. By utilizing the method, the γ-ray strength functions of 77, 78, 80Se were deduced so as to reproduce the 7...

We propose to measure the γ-ray emission probability from excited states above 5 MeV including giant resonance of 16O and 12C as a function of excitation energy in 1-MeV step. Here, we measure both the excitation energy (Ex=5-30MeV) at the forward scattering angles (0°-3°) of the 16O, 12C (p, p’) reaction using Grand-Raiden Spectrometer and the ene...

A precision measurement of the $^{71}\mathrm{Ga}(^{3}\mathrm{He},t)^{71}\mathrm{Ge}$ charge-exchange reaction was performed. By using a rather complete set of theoretical form factors to describe the cross-section angular distributions over a large angular range, the Gamow-Teller strength distribution up to the effective neutron-separation energy i...

We investigated decay properties of the broad resonance around 10 MeV in 12C and measured inelastic scattering of 386 MeV α particles on 16O at extremely forward angles including 0°. We have found that the lower component of the broad 0+ resonance at 10 MeV in 12C decayed to the 8Be + α channel, and that the higher component decayed both to the 8Be...

Excited states in 12C nuclei play a very important role in the nucleosynthesis in the universe. 12C nuclei are synthesized by the triple α reaction. Normally this process proceeds via the 0+2 state (Hoyle state) at Ex = 7.65 MeV in 12C, however, at high temperature T > 109 the highly excited 3α resonant states such as the 3−1 state at Ex = 9.64 MeV...

The excitation of the isoscalar giant monopole resonance (ISGMR) in $^{116}$Sn and $^{208}$Pb has been investigated using small-angle (including $0^\circ$) inelastic scattering of 100 MeV/u deuteron and multipole-decomposition analysis (MDA). The extracted strength distributions agree well with those from inelastic scattering of 100 MeV/u $\alpha$...

Using linearly-polarized laser-Compton scattering γ-rays, partial E1 and M1 photoneutron cross sections along with total cross sections were determined for 207,208Pb at four energies near neutron threshold by measuring anisotropies in photoneutron emission. Separately, total photoneutron cross sections were measured for 207,208Pb with a high-effici...

Electric dipole (E1) reduced transition probability B(E1) of 90 Zr was obtained by the inelastic proton scattering near 0 degrees using a 295 MeV proton beam and multipole decomposition analysis of the angular distribution by the distorted-wave Born approximation with the Hartree-Fock plus random-phase approximation model and inclusion of El C...

Isoscalar giant resonances and low spin states in S-32 have been measured with inelastic a scattering at extremely forward angles including zero degrees at E-alpha = 386 MeV. By applying multipole decomposition analysis, various excited states are classified according to their spins and parities (J(pi)), and are discussed in relation to the superde...

High-energy-resolution 56Fe(3He,t)56Co reaction measurements were performed at forward angles including 0∘. From the spectra obtained, the splitting of the Fermi transition strength and thus the isospin mixing between the Jπ=0+ isobaric analog state (IAS) at 3.60 MeV and a neighboring 0+ state at 3.53 MeV have been investigated. In order to disting...

Isoscalar giant resonances and low spin states in $^{32}$S have been measured with inelastic $\alpha$ scattering at extremely forward angles including zero degrees at E$_{\alpha}$ = 386 MeV. By applying the multipole decomposition analysis, various excited states are classified according to their spin and parities (J$^{\pi}$), and are discussed in...

A laser-Compton backscattering beam, which we call a `Laser-Electron Photon' beam, was upgraded at the LEPS beamline of SPring-8. We accomplished the gains in backscattered photon beam intensities by factors of 1.5--1.8 with the injection of two adjacent laser beams or a higher power laser beam into the storage ring. The maximum energy of the photo...

Using inelastic $\alpha$-scattering at extremely forward angles, including $0^\circ$, the strength distributions of the isoscalar giant monopole resonance (ISGMR) have been measured in the $^{204,206,208}$Pb isotopes in order to examine the proposed mutually enhanced magicity (MEM) effect on the nuclear incompressibility. The MEM effect had been su...

Photoneutron cross sections were measured for 94Mo, 95Mo, 96Mo, 97Mo, 98Mo, and 100Mo near the neutron threshold with quasi-monochromatic laser-Compton scattering γ rays. The photoneutron data were analyzed with the Skyrme Hartree-Fock-Bogoliubov (HFB) plus quasiparticle random phase approximation (QRPA) model and the axially symmetric-deformed Gog...

A search for $K^-pp$ bound state (the lightest kaonic nucleus) has been performed using the $\gamma d \rightarrow K^+ \pi^- \rm{X}$ reaction at E$_\gamma$=1.5-2.4 GeV at LEPS/SPring-8. The differential cross section of $K^+ \pi^-$ photo-production off deuterium has been measured for the first time in this energy region, and a bump structure was sea...

Microwave radiation from extensive air showers is expected to provide a new technique to observe UHECR. We insatlled and operate radio telescopes in Osaka and at Telescope Array site in Utah, USA. In Osaka, we are coincidentally operating two Ku band radio telescopes with an air shower array which consists of nine plastic scintillators with about 1...

Radiative neutron capture cross sections are of direct relevance for the synthesis of heavy elements referred to as the s-process and the r-process in nuclear astrophysics and constitute basic data in the field of nuclear engineering. The surrogate reaction technique is in active use to indirectly determine radiative neutron capture cross sections...

Two experiments for the detections of Molecular Bremsstrahlung Radiation (MBR) from air-shower are under development in West Japan. One of these systems consists of 12 parabola antennas. And the other one uses a 45 cm Broadcasting Satellite (BS) antenna in a scintillator array. Both experiments measure 12 GHz radio emission from air-showers. The se...

The inelastic α-scattering experiment on 56Ni in inverse kinematics was performed at an incident energy of 50 MeV/u at GANIL. A very high multiplicity for α-particle emission was observed with our phase-space limited experimental set-up. The maximum observed multiplicity, which cannot be explained by means of the statistical decay model, amounted t...

We performed a coincidence measurement of decay-α particles by using inelastic scattering of 386 MeV α particles on 12C. We obtained further evidence for the second 2+ state at 9.84 MeV, which we found in previous work, from angular correlation functions for decay-α particles. The coincidence energy spectra with the α-decay to the ground state and...

Neutron induced reaction is one of the greatest interest to the nuclear power field, such as nuclear transmutation techniques by using accelerator-driven system (ADS), as well as nuclear astrophysics. In this work, the neutron total cross-sections for the natural Tin (natSn) and Nickel (natNi) were measured by using a neutron Time-of-Flight (n-TOF)...

Gamow-Teller (GT) strength distributions have been investigated in a high-resolution (3He,t) charge-exchange experiment on the double-β (ββ ) decaying nuclei 128Te and 130Te. The experiment was carried out at the Research Center for Nuclear Physics, Osaka, with a 420-MeV incident 3He beam and the Grand Raiden magnetic spectrometer. A final-state en...

Nuclear incompressibility is studied using ISGMR, a collective excitation mode of the nucleus. With the advent of the radioactive ion beam facilities, it would be very interesting to measure the ISGMR strength distributions in nuclei far from the stability line. However, these experiments would have to be done in inverse kinematics and the most app...

The 12C excitation energy spectra populated in both proton and α-particle inelastic scattering measurements are examined. The data indicate the existence of a 2+ state at Ex=9.75(0.15) MeV with a width of 750(150) keV. It is believed that this state corresponds to the 2+ excitation of the 7.65 MeV, 0+, Hoyle state, which acts as the main path by wh...

The isoscalar giant monopole resonance (ISGMR) in even-A Cd isotopes has been studied by inelastic ${\alpha}$-scattering at 100 MeV/u and at extremely forward angles, including 0deg. The asymmetry term in the nuclear incompressibility extracted from the ISGMR in Cd isotopes is found to be $K_{\tau} = -555 \pm 75$ MeV, confirming the value previousl...

Using quasimonochromatic laser-Compton scattering γ rays, total photoneutron cross sections were measured for 206, 207, 208Pb near neutron threshold with a high-efficiency 4π neutron detector. Partial E1 and M1 photoneutron cross sections along with total cross sections were determined for 207, 208Pb at four energies near threshold by measuring ani...

A high-resolution measurement of inelastic proton scattering off 90Zr near 0° was performed at 295 MeV with a focus on a pronounced strength previously reported in the low-energy tail of giant dipole resonance. A forest of fine structure was observed in the excitation energy region 7–12 MeV. A multipole decomposition analysis of the angular distrib...

The (γ, n) cross sections of Se isotopes (76Se,78Se) were measured to supply fundamental data for estimating the inverse reaction cross section, i.e., the 79Se(n, γ)80Se cross section. The enriched samples and a reference 197Au sample were irradiated with laser-Compton scattering (LCS) γ-rays. The excitation function of each (γ, n) cross section wa...

A 71Ga(3He, t)71Ge charge-exchange experiment was performed to extract with high precision the Gamow–Teller (GT) transition strengths to the three lowest-lying states in 71Ge, i.e., the ground state (1/2−), the 175 keV (5/2−) and the 500 keV (3/2−) excited states. These are the relevant states, which are populated via a charged-current reaction ind...

We measured pulse-height spectra of 16.7MeV laser-Compton scattering photons with a 6in.×5in. NaI(Tl) detector for blank and three lead materials of 75.8, 50.9, and 25.9% transmissions at the NewSUBARU facility to investigate how the original Poisson distribution of the pulsed photons is modified after passing through thick-target materials. We pre...

Photoneutron cross sections were measured for 118Sn, 119Sn, 120Sn, 122Sn, and 124Sn near neutron threshold with quasi-monochromatic laser-Compton scattering γ rays. A systematic analysis of the present photoneutron data and existing neutron-capture data is made using the γ-ray strength function on the basis of the HFB + QRPA model of E1 strength su...

A (3He,t) charge-exchange reaction experiment on the double-beta decaying nucleus 136Xe has been performed at an incident energy of 420 MeV with the objective to measure the Gamow-Teller (GT) strength distribution in 136Cs. The measurements have been carried out at the dispersion-matched WS beam line and the Grand Raiden spectrometer of the Researc...

Inelastic scattering from 12C has been measured at extremely forward angles including 0 ∘ using 386 MeV α particles to study the α-cluster states around Ex ∼ 10 MeV, especially the 2+ state predicted by the α-cluster model. We have analyzed (α,α′) cross-section data using both peak-fitting and multipole decomposition techniques. A 2+ state at Ex= 9...

Photoneutron cross sections were measured for 118Sn, 119Sn, 120Sn, 122Sn, and 124Sn near neutron threshold with quasi-monochromatic laser-Compton scattering γ rays. A systematic analysis of the present photoneutron data and existing neutron-capture data is made using the γ-ray strength function on the basis of the HFB + QRPA model of E1 strength su...

Photoneutron cross sections were measured for Au in the entire energy range of the (γ,n) channel based on a direct neutron‐counting technique with quasimonochromatic γ rays produced in inverse Compton‐scattering of laser photons with relativistic electrons. We present results of the measurement in comparison with the past data.

Photoneutron cross sections were measured for 108Pd, 106Pd, and 105Pd with laser‐Compton scattering γ‐ray beams in an application of the γSF method to a radioactive nucleus 107Pd. We present radiative neutron cross sections for 107Pd[6.5×106 y] obtained with the γSF method.

The γ‐ray strength function (γSF) interconnects radiative neutron capture and photoneutron emission as a common ingredient in the statistical model. Outlined here is an indirect method of determining radiative neutron‐capture cross sections for unstable nuclei based on the γ‐ray strength function. Application examples of the γSF method are demonstr...

Photoneutron cross sections for 90 Zr near neutron threshold were examined with a photon difference technique using laser Compton scattering γ‐ray beams. The cross section decreasing in the vicinity of neutron threshold exhibited a steep rise within 150 keV above the threshold. We draw attention to a possible relation of this striking behavior...

The {gamma}-ray strength function ({gamma}SF) interconnects radiative neutron capture and photoneutron emission as a common ingredient in the statistical model. Outlined here is an indirect method of determining radiative neutron-capture cross sections for unstable nuclei based on the {gamma}-ray strength function. Application examples of the {gamm...

Recent study of the giant monopole resonance (GMR) in the even A, ^112-124Sn[1] and ^106-116Cd isotopes showed discrepancy in the centroid energy of GMR peak when compared with the theoretical calculations. It has been suggested [2] that this discrepancy might result from the MEM effect [3]. A consequence of this hypothesis would be significantly h...

The photo-nuclear cross sections of Se isotopes ((80)Se, (78)Se, (77)Se, (76)Se) were measured with laser-Compton scattering (LOS) gamma-rays to supply fundamental data for the estimation of the inverse reaction cross sections, i.e., the (79)Se(n,gamma)(80)Se cross section. Enriched Se isotope samples were irradiated with LOS gamma-rays whose maxim...